lcd screen brightness free sample
One of the most obvious things that can show the strain of being at your computer for a period of time is your eyes. It doesn’t take a lot for a badly configured monitor or laptop screen to cause problems and put extra strain on your eyes because brightness or contrast settings are set too high. Proper configuration can make viewing more comfortable, especially you are at your computer for prolonged periods of time.
Most monitors should have controls to adjust these types of settings but that isn’t always the case. An old Dell Studio One 1909 desktop we have here, is one such system without external controls for brightness and contrast. Laptops and netbooks should have a dedicated Fn key combination or utility from the manufacturer for brightness. Windows sometimes has a brightness slider in the notification area or the system power plan.
If you don’t have or cannot find brightness and contrast controls to adjust the display to your liking, an option is using a third party tool. Here’s a selection of 10 free programs to adjust the brightness, contrast, gamma or color temperature settings of your computer screen.
ClickMonitorDDC is probably the most powerful utility of its type and it adjusts the real settings of your monitor. By default, it shows sliders for brightness, contrast, saturation/vibrance, monitor audio volume, and device audio volume. This can be expanded to include red, green and blue sliders if your monitor has a User profile. If available, the User profile can be selected from the top drop down in the lower left corner.
If you are looking for a simple slider to adjust screen brightness and require no extra functions or features, this is a useful option. Despite the name, Win10 Brightness Slider also works on Windows 7 (needs .NET Framework 4 or higher) and Windows 8.1, is open source and a standalone executable.
The program just sits as an icon in the tray notification area and left clicking on it will popup the brightness slider. A second or third slider will be available if you have a multiple monitor setup. DDC/CI is supported and there’s a run on startup option in the icon’s context menu. Make sure to put the program in a permanent location before enabling run on start as the tool will be launched from its current location.
Gamma Panel actually dates way back to 2002 but still seems to work fine in Windows 10. It should be good for users who want to change a bit more than just the standard brightness of their display. In addition to brightness, Gamma Panel can also adjust gamma and contrast with the added ability to allow each of the Red, Green and Blue colors to be tweaked individually or all together.
Windows 10 has a built-in display temperature feature called Night Light. f.lux is a similar but more feature rich tool that can adjust the color and brightness of your screen depending on the time of day and light condition of the local environment. Your location can be entered during the first run of the program, this can be a city name, a zipcode or coordinates (if you know them).
ScreenBright is a free and portable tool that can adjust the brightness, contrast, color luminance and color temperature of your display. There is a slight drawback of the program needing a DDC/CI or USB-control compatible display to work, which not all monitors or laptop screens will have. Usage is simple and you adjust the sliders then click Save when you’re happy with the result.
In addition to brightness, contrast, and luminance, there’s a vertical slider that affects green levels while the horizontal slider affects color temperature. There is no reset option in ScreenBright so make sure you note down the default settings before you start. ScreenBright also has support for command line arguments so you can use it in shortcuts, scripts or even set up a scheduled task.
Although Windows 10 comes built-in with a Night Mode and quick brightness slider, it doesn’t work on extended displays or desktops. If you use a multi-monitor setup, you have to manually adjust the brightness levels on every monitor. Having said that, you can get past this by simply using screen dimmer apps for Windows 10.
Dimmer, as the name suggests, is a basic Windows screen dimming app that supports multiple displays. The app casts a grey overlay on all the displays and you can just move the slider to dim the screens. I tried it on 3 monitor setup and it worked flawlessly. Dimmer is a portable program. So, you just have to extract the zip folder and double-click to use Dimmer.
Similar to Dimmer, PangoBright is another screen dimmer app for Windows 10. It stays in the system tray and instead of a slider, you get percentages. On top of usual features in Dimmer, PangoBright also provides you an option to change the tint color of the screen.
CareUEyes builds a bit on the above-mentioned apps. It provides manual toggles for screen white balance, brightness, etc. Also, if you find all of these options confusing, there are built-in presets like Office, Editing, Gaming, Reading, etc. for different scenarios. On top of it, you can also create your own presets.
My favorite feature of CareUEyes is that you have the option to set up hotkeys to increase or decrease the brightness. So, instead of opening the app every time, I can control the brightness of all my monitors with keyboard shortcuts. The only caveat with the app is that it doesn’t provide separate controls for individual monitors. The settings apply to every monitor connected.
F.lux is a popular screen dimmer cum night mode app for Windows 10. Although Windows 10 has an inbuilt night mode, it’s pretty barebone. Foremost, it doesn’t let you customize the white balance value of the tint. On the other hand, f.lux provides all the customizations you will need in a screen dimmer app.
When you open f.lux for the first time, it asks you to enter your location and adjust brightness as per the time of day. For instance, it provides 3 different white balance tones for sunrise, sunset, and bedtime. You can customize these options and have even more white balance timers.
Moreover, if you have a smart light like Philips Hue or Yeelight, you can sync them with f.lux. It’ll customize the white balance of your screen along with the light in your house.
Iris Screen Dimmer is a mix and match of minimal as well as power options. In case you need a simple app to just modify screen brightness settings automatically as per time of the day, Iris Screen Dimmer can do that. If you are a power user who wants to fine-tune brightness, gamma, saturation, etc manually, Iris Screen Dimmer lets you do that as well. It syncs all your settings across multiple monitors.
Win10 Brightness Slider is a brightness control app rather than a screen dimmer app. Basically, other apps overlay a tint over the display instead of modifying the brightness. Win10 Brightness Slider, on the other hand, sends commands to modify the brightness values of the monitors and extended displays. However, your monitor needs to support DDC/CI and it has to be enabled in the monitor. In case you don’t know, DDC/CI lets software control the brightness and other settings of the monitor.
Win10 Brightness slider is the most basic brightness control app. It just sits on the system tray and lets you change the display values. If you have 1 monitor connected, it shows 1 slider and if you have 2 monitors connected, it shows 2 different sliders.
Similar to Win10 Brightness Slider, DisplayTuner also works with DDC/CI displays. Apart from the brightness slider, DisplayTuner also provides you the option to adjust the gamma, RGB levels, etc. Moreover, it lets you control the audio levels, screen orientation of the desktops right from within the app.
The only caveat with DisplayTuner is that it doesn’t work on laptop screens. For instance, if you have a laptop extending to a monitor, it works only on the monitor but not on the laptop.
Click Monitor CDC is similar to DisplayTuner but with a lot more customizations and hotkeys. Apart from the usual brightness and sound levels, it also lets you set up brightness and audio levels for different times of the day. You have to manually set it up within the app first.
Moreover, you get a lot of hotkeys as well as mouse action support. The mouse action support is quite interesting. In case you have 2 monitors, ClickMonitorDDC will show up with 2 icons in the system tray. Now, you just have to hover over the ClickMonitorDDC icon in the system tray and rotate the mouse cursor to increase or reduce the brightness. You can also setup double-click mouse actions to quickly switch to a preset.
For a minimal use case, Dimmer is a portable app that lets you control monitors individually. I use f.lux as it requires minimal manual setup and works flawlessly. If you are a power user, you should try a brightness control app like ClickMonitorDDC.
A good monitor is expensive. But its impact will be lost if you don"t take the pain to carefully (and intermittently) calibrate your monitor. The colors on the screen may not be the exact match of what they actually are.
To open the Display Color Calibration tool, press Windows + S or open the Start menu, search for "calibrate display color," then open the matching result, and follow the on-screen instructions.
The tool will take you through basic color settings, brightness and contrast controls, and an RGB color balance adjustment. When you"re done, you can opt to start the ClearType Text Tuner "to ensure that text appears correctly."
To manually open the ClearType Text Tuner, press Windows + S, search for "adjust ClearType text," then follow the on-screen instructions. On each of five screens, you"ll select the text samples that look best to you.
Photo Friday is a photography site. Think of the challenges involved in adjusting the brightness and contrast of a shot, and you get the reason you should calibrate your monitor. So, head to the link for their monitor calibration tool beneath the homepage, or hit the link above.
The site offers this simple one-page monitor calibration tool to adjust the brightness and contrast of your screen thanks to the gray scale tones. The idea is to tweak the monitor settings (or buttons) so that you can clearly distinguish the transition of tones from true black to true white. After calibration, the blacks should look black and without any hint of gray.
The instructions start off by telling you to dim the lights and hit F11 for viewing the gray scale chart in full-screen mode. Observe your monitor from your normal viewing distance.
The Lagom LCD Monitor Test Pages are a far more comprehensive set of tools than Photo Friday. The site includes a series of test patterns that start from checking contrast to checking for response times of your monitor. It is recommended to go through the tests in the order they are placed.
For instance, use the first few images to check brightness, contrast, and sharpness. With those set, use a latter test like the “Viewing Angle” to see if the display changes brightness or colors in the corners.
For a beginner, it might seem overwhelming. But, the test patterns come with helpful explanations. The developer also states that you can put the images on a USB drive and try them in the computer store when shopping for an LCD monitor. A 120 KB ZIP file download is included.
The Online Monitor Test website has a range of interactive tests to fix your screen colors. The menu appears when you move your mouse to the top. It starts off with a test that checks the brightness and contrast across the B/W tonal spectrum. It is similar to the test we covered on the Photo Friday website.
Next, the Color Range test checks if your monitor can smoothly produce color gradients. From the menu, you can pick different color charts. Look for “ghost images” or image trails in the Trailing test. Move the box across the screen and check if any trails are produced. The controls and options to change the color and shape of the box are placed at the bottom.
The Homogeneity test helps to pinpoint damaged pixels and faulty monitors with backlight bleeding. 1:1 Pixel mapping and testing for a blurring of Text are the last two tests on the lineup. While the former is not so much an issue with LCD computer monitors, the latter is worth a tryout if you feel that screen text is not crisp enough.
This single page screen calibration chart has few of the test images we have already covered in the earlier tools. Go through the color, gray scale, and gamma adjustments.
Eye strain can be a huge issue for anyone who spends a lot of time looking at screens—whether that"s a desktop monitor, a television, or even a smartphone. Improper screen brightness settings can cause your eyes to strain, and fatigue while staring into bright screens at night can make it difficult to fall asleep.
Research has shown that exposure to blue light (the kind emitted by electronic screens) at night can disrupt your circadian rhythm, a biological process involved with sleep cycles. That"s why you should start using one of the following Android screen brightness apps. You"ll be surprised how helpful they can be.
If there"s one thing that puts CF.lumen ahead of all other brightness and screen temperature apps, it"s this: CF.lumen adjusts colors by directly manipulating gamma values rather than using a tinted transparent overlay (although an overlay option is available in the settings).
All of the automatic brightness adjustments are made according to your location and time of day. You can customize the adjustment amounts, and you can toggle some nifty options like "Force sleep mode in the dark" or "Force day mode in bright ambient light." Useful when, for example, you"re in a bright room at midnight.
Twilight is another well-known app to reduce screen brightness on your smartphone. Using sunrise and sunset times as indicators, Twilight automatically adjusts the screen temperature (how much blue light is emitted) to lessen disruption of your circadian rhythms. After sunset, Twilight dampens screen temperature using blue-light filtering and warmth intensity.
Twilight also has a dimness factor, so you can ignore all of the warmth and temperature controls and automatically adjust screen dimness based on the same sunrise and sunset settings.
Velis is a replacement for Android"s default auto-brightness feature without all of the other bells and whistles that come with other brightness management apps. The learning curve for Velis is slightly steep, but that"s because it gives you maximum control over what you can do. Fortunately, it also comes with a setup wizard to get you going right away.
Velis gives you a graph (ambient light reading along the X-axis, screen brightness along the Y-axis) and allows you full control over what the auto-brightness graph should look like at every point. At such-and-such ambient lighting, you can set the brightness for A; at so-and-so ambient light, brightness B. Velis fills in the gaps.
Other great features you"ll find in Velis: super dimming (even darker than Android"s default minimum brightness), excluded apps (Velis won"t run when these apps are in focus), and multiple profiles for different auto-brightness graphs.
The brightness on your computer, tablet, or smartphone can quickly cause eye strain and make you uncomfortable. Night Screen is another brightness app that will help you lower your screen brightness with a few changes in your settings. It applies an overlay filter that you can adjust to darken your screen.
The Night Screen app makes it straightforward for you to set the brightness level you want. You can also use the blue light filter to improve your sleep when you finally put your phone down. Unlike many other brightness apps, you can also dim the navigation bar as well to protect your eyes better.
The widget also makes it easy to enable and disable the Night Screen app when it is not in use, but unless you purchase additional features, you will have to set the brightness level each time you launch the app.
With this brightness control app, you can effortlessly adjust your phone display screen"s brightness level. The adjustments make it easy to use your phone without straining your eyes. You can create a custom brightness plan depending on what you find most comfortable on your phone.
The levels include low, high, and normal brightness. The various brightness levels make this app ideal if you are looking for a fast and efficient utility, as you can quickly switch between plans based on the time of day or what other app you"re using.
The Light Delight app features an easy to use interface for you to reduce brightness to any level. It works by blocking blue light to lower the screen brightness, especially when using your phone at night. The app works by using color filters to help you protect your eyes from glare and other harmful effects.
With screen brightness, you might only realize how much impact it has until someone shows you. You might think the fuss over it was nonsense, but it"s worth trying some of these apps out to see for yourself. It won"t take long for your eyes to feel less fatigued and for your sleep pattern to become normalized. Don"t underestimate the usefulness of these apps!
Some Windows 11 PCs can automatically adjust the screen brightness and contrast based on content that’s displayed on your built-in screen. For example, if you’re watching a video that has a dark scene, followed by a brighter scene (for example, one that shows a bright sunny day), the brightness and contrast may change. This is normal.
Content adaptive brightness control provides ideal brightness and contrast levels, while saving power and providing longer battery life at the same time. If these sudden brightness changes are distracting, or if you work in photo and video apps where color accuracy is important to you, you can turn this off any time. When you turn it off, it can result in shorter battery life.
In Display settings, select Brightness, then clear the Help improve battery by optimizing the content shown and brightness check box. You can select the check box to turn this back on any time.
Some Windows PCs can also adjust the screen brightness automatically based on the light around you. For more info, see Change screen brightness in Windows.
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Always wondered how to reduce your screen brightness? Or, how to dim your computer monitor, screen or display? Wonder no more. Dimmer was created for this exact task, to help you lower the computer screen brightness, so you can work with no detriment to your eyes.
By reducing the brightness of your screens, Dimmer helps to protect you from excessive light radiation which damages your eyes. It has helped to save the eyesight of thousands of people since 2007. Some say it"s better than carrots. Dimmer is designed to run on all versions of Windows in a quick, easy and intuitive way. It"s also very lightweight on system resources, ideal for everyday use.
The need for this program came about when working at night with minimum ambient light in the room. This was uncomfortable and damaging to the eyes. So one day (back in 2004) I decided to develop Dimmer to solve this problem. The monitor brightness can now be easily adjusted via a slider and/or text input controls which are very easy to use. I eventually released it to the public in 2007.
Another convenient feature is that Dimmer does not require installation. It"s a portable application. Simply extract into a folder and run. The program stores its settings into a file in the program folder (for your convenience) so the Windows Registry is not used. When no longer needed, just delete the program folder. When Dimmer runs, it will remember and dim the brightness to the level it was last used.
Dimmer has been much acclaimed over the years for its simplicity and as the best dimming software for displays, screens or monitors. Feel free to recommend it to your friends and family and you may link to this page if you wish. Hope you enjoy and find this software useful.
Always wondered how to reduce your screen brightness? Or, how to dim your computer monitor, screen or display? Wonder no more. Dimmer was created for this exact task, to help you lower the computer screen brightness, so you can work with no detriment to your eyes.
By reducing the brightness of your screens, Dimmer helps to protect you from excessive light radiation which damages your eyes. It has helped to save the eyesight of thousands of people since 2007. Some say it"s better than carrots. Dimmer is designed to run on all versions of Windows in a quick, easy and intuitive way. It"s also very lightweight on system resources, ideal for everyday use.
The need for this program came about when working at night with minimum ambient light in the room. This was uncomfortable and damaging to the eyes. So one day (back in 2004) I decided to develop Dimmer to solve this problem. The monitor brightness can now be easily adjusted via a slider and/or text input controls which are very easy to use. I eventually released it to the public in 2007.
Another convenient feature is that Dimmer does not require installation. It"s a portable application. Simply extract into a folder and run. The program stores its settings into a file in the program folder (for your convenience) so the Windows Registry is not used. When no longer needed, just delete the program folder. When Dimmer runs, it will remember and dim the brightness to the level it was last used.
Dimmer has been much acclaimed over the years for its simplicity and as the best dimming software for displays, screens or monitors. Feel free to recommend it to your friends and family and you may link to this page if you wish. Hope you enjoy and find this software useful.
Screen brightness might be tricky to control. On some machines physical hardware switches are missing and software solutions may not work well. However, it is generally possible to find a functional method for a given hardware. This article aims to summarize all possible ways to adjust the backlight.
There are many ways to control brightness of a monitor, laptop or integrated panel (such as the iMac). According to these discussions and this wiki page the control method can be divided into these categories:
brightness is controlled by either the ACPI, graphic or platform driver. In this case, backlight control is exposed to the user through /sys/class/backlight which can be used by user-space backlight utilities.
Note: Since OLED screens have no backlight, brightness cannot be controlled by changing backlight power on laptops equipped with an OLED screen. In this case, perceived screen brightness can be adjusted with a PWM control (not implemented in the Linux kernel) or via software color correction.
The brightness of the screen backlight is adjusted by setting the power level of the backlight LEDs or cathodes. The power level can often be controlled using the ACPI kernel module for video. An interface to this module is provided via a /sys/class/backlight/.
By default, only root can change the brightness by this method. To allow users in the video group to change the brightness, a udev rule such as the following can be used:
Reason: Explain why it is not possible to alter file permissions with GROUP="video", MODE="0664". (Discuss in Talk:Backlight#Udev rules for permissions of brightness doesn"t work)
Sometimes ACPI does not work well due to different motherboard implementations and ACPI quirks. This results in, for instance, inaccurate brightness notifications. This includes some laptops with dual graphics (e.g., Nvidia/Radeon dedicated GPU with Intel/AMD integrated GPU). Additionally, ACPI sometimes needs to register its own acpi_video0 backlight even if one already exists (such as intel_backlight), which can be done by adding one of the following kernel parameters:
Note: The systemd-backlight service restores the previous backlight brightness level at boot. To prevent conflicts for the above rules, see #Save and restore functionality.
DDC/CI (Display Data Channel Command Interface) can be used to communicate with external monitors implementing MCCS (Monitor Control Command Set) over I2C. DDC can control brightness, contrast, inputs, etc on supported monitors. Settings available via the OSD (On-Screen Display) panel can usually also be managed via DDC. The kernel module i2c-dev may need to be loaded if the /dev/i2c-* devices do not exist.
To facilitate binding screen brightness control to a keyboard shortcut, it may be convenient to enable non-superuser access to the relevant I2C devices. This can be achieved by adding a group i2c and configuring udev to set this group as the owner of the I2C devices. See [4].
The systemd package includes the service systemd-backlight@.service, which is enabled by default and "static". It saves the backlight brightness level at shutdown and restores it at boot. The service uses the ACPI method described in #ACPI, generating services for each folder found in /sys/class/backlight/. For example, if there is a folder named acpi_video0, it generates a service called systemd-backlight@backlight:acpi_video0.service. When using other methods of setting the backlight at boot, it is recommended to stop systemd-backlight from restoring the backlight by setting the kernel parameters parameter systemd.restore_state=0. See
Note: The utilities in the following table can be used to control screen brightness. All of them are compatible with Wayland and do not require X. Some (like video (or input) group to modify brightness.
Manages screen temperature (Xorg only) and smoothly dims brightness after a timeout. Supports ambient light sensors [5]. Can turn webcam into an ambient light sensor.
Automatic brightness adjustment based on screen contents and ambient light. Can use webcam or time to simulate ambient light sensor. Supports keyboards and external monitors. Uses wlroots.
Tip: Commands involving these utilities can be bound to the XF86MonBrightnessUp and XF86MonBrightnessDown keyboard keys as described in Keyboard shortcuts#Xorg.
Note: Using this with an iGPU+dGPU setup can cause unpredictable screen update lag and/or flickering in user interface items inside apps that are offloaded to the dGPU. Only use this if all else fails.
If you have enabled Intel Fastboot you might also get the No outputs have backlight property error. In this case, trying the above method may cause Xorg to crash on start up. You should disable it to fix the issue. It is known to cause issues with brightness control.
$ gdbus call --session --dest org.gnome.SettingsDaemon.Power --object-path /org/gnome/SettingsDaemon/Power --method org.freedesktop.DBus.Properties.Set org.gnome.SettingsDaemon.Power.Screen Brightness "
$ gdbus call --session --dest org.gnome.SettingsDaemon.Power --object-path /org/gnome/SettingsDaemon/Power --method org.gnome.SettingsDaemon.Power.Screen.StepUp
$ gdbus call --session --dest org.gnome.SettingsDaemon.Power --object-path /org/gnome/SettingsDaemon/Power --method org.gnome.SettingsDaemon.Power.Screen.StepDown
Color correction does not change the backlight power, it just modifies the video lookup table: this means that your battery life will be unaffected by the change. Nevertheless, it could be useful when no backlight control is available (desktop PCs or laptops with OLED screens).
Clight — User daemon utility that aims to fully manage your display. It can manage the screen temperature depending on the current time of the day, just like redshift does. It tries to use
This should roughly double luma in the image. It will sacrifice color quality for brightness, nevertheless it is particularly suited for situations where the ambient light is very bright (e.g. sunlight).
This can also be used to reduce perceived brightness in a dark room by specifying some value less than 1 (e.g. 0.5), this is useful when no backlight control is available (e.g. desktop PC).
Users of NVIDIA"s proprietary drivers can change display brightness via the nvidia-settings utility under "X Server Color Correction." However, note that this has absolutely nothing to do with backlight (intensity), it merely adjusts the color output. (Reducing brightness this way is a power-inefficient last resort when all other options fail; increasing brightness spoils your color output completely, in a way similar to overexposed photos.)
Laptops with LED backlight are known to have screen flicker sometimes. This is because the most efficient way of controlling LED backlight brightness is by turning the LED"s on and off very quickly varying the amount of time they are on.
However, the frequency of the switching, so-called PWM (pulse-width modulation) frequency, may not be high enough for the eye to perceive it as a single brightness and instead see flickering. This causes some people to have symptoms such as headaches and eyestrain.
On some systems, the brightness hotkeys on your keyboard correctly modify the values of the acpi interface in /sys/class/backlight/acpi_video0/actual_brightness but the brightness of the screen is not changed. Brightness applets from desktop environments may also show changes to no effect.
A workaround is to use the inotify kernel api to trigger xbacklight each time the value of /sys/class/backlight/acpi_video0/actual_brightness changes.
Due to a bug introduced recently in the amdgpu driver, the backlight"s actual_brightness value is reported as a 16-bit integer, which is outside the 8-bit range specified in max_brightness. This causes the systemd-backlight service to attempt to restore, at boot time, a value that is too large and ends being truncated to maximum brightness (255).
While the bug is not addressed, one possible workaround is to modify the stored brightness to within the correct range before it is restored. This can be accomplished with a script and a service unit:
On certain systems, the backlight level reported by the driver is in the correct range [0, 255], but systemd still fails to restore the correct value. This is probably due to a race in the kernel. In this case, truncating the brightness level will not help since it is already in the correct range. Instead, saving the brightness level to systemd before shutting down could work as a workaround. This can be accomplished by the following script and service unit:
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Supports multiple protocols to adjust brightness: DDC for external displays (brightness, contrast, volume), native Apple protocol for Apple and built-in displays, Gamma table control for software adjustment (recommended for OLED), shade control for AirPlay, Sidecar and Display Link devices.
Synchronize brightness from built-in and Apple screens - replicate Ambient light sensor and touch bar induced changes to a non-Apple external display!
Add the app to Accessibility under System Preferences » Security & Privacy » Privacy as prompted (this is required only if you wish to use the native Apple keyboard brightness and media keys - if this is not the case, you can safely skip this step).
Use your keyboard or the sliders in the app menu (a brightness symbol in the macOS menubar as shown on the screenshot above) to control your displays.
Most modern LCD displays from all major manufacturers supported implemented DDC/CI protocol via DisplayPort, HDMI, USB-C or VGA to allow for hardware backlight control.
LCD and LED Televisions usually do not implement DDC, these are supported using software alternatives to dim the image (some higher-end sets are able to translate this into hardware backlight dimming).
LCDs are analog devices like CRTs, internally, where an analog signal and circuitry control the brightness of each pixel. However, LCDs come with digitally addressed pixels, behave very differently from CRTs, and need a different evaluation approach.
While selling electronic products like LCD screens or monitors, a few parameters are essential to consider, for example, backlight, colors, brightness, and backlight controls. Brightness, however, is the most important parameter when it comes to customer satisfaction and complimentary reviews. The brightness of LCD screens ranges from 250 units to more than 1000 units, with output light at around 350 to 450 candelas (cd) per square meter. A screen"s brightness or luminance is vital in helping to determine which LCD screens need replacement, repair, or are damaged beyond repair. LCD screens can also aid in distinguishing different models from one another according to their luminescence and angle of observation.
One method is to buy a photometer that registers brightness in candelas per square meter (cd/m^2). Then turn off the lights in the room, obstructing all kinds of external light. LCD screen must be left turned on. Next, maximize the brightness of the LCD. The background screen of the LCD must somehow be turned entirely white to get a standard reading. Either enlarge a blank document or open a Word document to reach the desired results. The next step would be to place the flat of the photometer"s sensor up against the screen and take a reading according to the instructions provided with the photometer. Placing the photometer against the screen guarantees observation of maximum intensity, standardizing the measurement procedure between screens. Measuring from the usual place of computer users introduces too many variables, distorting the one authentic reading. Placing the sensor on the white screen is particularly important if the desired result is a standard measurement. Taking a few readings at different angles can be wise, especially if one is interested in narrowing the observable range. For example, all the readings could be taken at an angle 30 degrees from the screen to standardize the measurement. Keeping a protractor close for precision could be prudent.
Computer experts recommend several types of tests, including hardware and software tests. By adopting the method of trichromatic filter, the luminance colorimeter can measure brightness, color temperatures like CIELAB, CIELUV, and color difference. The four measuring angles can be switched as well. It is suitable for measuring luminescence in the field of low brightness, which requires a slight measuring angle, e.g., 0.1 °/ 0.2 °. In the case of long-distance measurement, the extension line is used for measuring both the main engine and inductor.
Input color coefficient and brightness deviation are some of the functions that can be achieved using an additional instrumental keyboard. Luminance colorimeter also proves its usefulness in computers for analysis and printing, lighting engineering, film, television, data storage, architecture, and other fields.
The Software, Monitors Matter Check Screen, is a professional LCD brightness software testing method, which does not only detect industrial LCD screens but this software tests CRT display (cathode ray tube) as well. Due to multiple features installed in it, this software can detect the color of LCD, text display effect, response time, bad points, and other vital indicators as well.
For LCDs, dark gray and black color production is quite tricky. So, the black level of an optimally adjusted LCD should be pretty close to absolute black unless the LCD is placed in dimly lit environments. DisplayMate offers a black-level visual test for such authentication. The brightness level of LCD should be adjusted from minimum to maximum to evaluate the black level of LCD.
Positive or negative shadows, called streaking, often trail on the right side of the screen quite visibly. However, severe streaking wraps the image details preceding it. But the image distortion is most apparent in high contrast situations, and LCDs show the tendency of both horizontal and vertical streaking.
Video Bandwidth Index is used to measure the visibility of high-frequency detail in an image. The outcome of value 100 is perfect and signals that both high and low frequencies are being identically produced. LCDs that use digital input should have the output just like that. However, for analogous LCDs, an outcome of value 100 is not possible, and values below 100 are considered second-tier performance. Performing this test on a green background is vital for best results. Values closer to 100 or exceeding indicate either over-peaking or compensation, which is considered a severe performance flaw in overall LCD performance.
If the intensity of three primary colors does not change with signal level uniformly, then on a closer inspection, grayscale will show colors tinting one or more points of the LCD screen. The tinting is mostly visible near the black at low or peak intensity because of the imbalanced saturation between RGB channels.
LCDs are not built to produce a smooth grayscale with 256 discrete intensity levels that increase from black to peak white. By using Intensity Level Ramp and Intensity Level Color Ramp, the smoothness of grayscale can be evaluated. The things to look out for are jumps, skips, flat spots, bumps, ripples, dips, or any other irregularities that stand out from the smoothness of grayscale.
In the case of a portable monitor for a laptop, the best way to test a laptop screen is to adjust screen brightness from dimmest to brightest repeatedly on, preferably, white background. Then push the laptop screen from furthest to nearest and vice versa, checking if the screen flickers.
A tool like Redshift can be useful for changing colour balance, but as much as possible you should try to change brightness with backlight adjustment.
I"ve only seen it in very high end displays intended for calibrated photo and video work ... and even many of those use a USB connection and custom USB HID based driver instead of the DDC/CI standard. I"m pretty outdated though, and the linked article claims that basic options like brightness and contrast are widely supported now.
Some cheap displays don"t support backlight control at all. The brightness controls on the display just adjust the pixel values on the LCD, just like software control does. Do not use these controls if you have such a monitor; it"s usually better to do the correction in software, certainly no worse.
All too many displays do have backlight control, but minimum brightness is still eye-searing. They can sometimes be modified, but otherwise your best bet is setting them to minimum backlight brightness and then living with changing pixel values to get them even dimmer.
The details are somewhat driver and software specific, but your laptop should offer convenient Fn keys that make it easy, and the OS should have a simple display brightness slider. The xbacklight utility offers a convenient command line control for this, though on my system it doesn"t seem to like to go below 1% brightness and goes straight to black.
I twiddle the driver controls because my T460 is very bright - wonderful during the day, but horrible at night. The minimum brightness step offered by the fn key adjustments is still way too bright, but the driver provides much finer grained control. xbacklight only lets me get down to brighness 8/255 and I"d like So I tell it to run at 4/255 brightness:
When you lower brightness you might want to increase contrast in software a bit, especially if working on text. It"ll cost you image quality, but gain you readability at low brightness. The xgamma utility will let you do that, e.g.