lcd module parallax in stock

The Parallax Serial LCDs (liquid crystal displays) can be easily connected to and controlled by a microcontroller using a simple serial protocol sent from a single I/O pin. The LCD displays provide basic text wrapping so that your text looks correct on the display. Full control over all of their advanced LCD features allows you to move the cursor anywhere on the display with a single instruction and turn the display on and off in any configuration. They support visible ASCII characters Dec 32-127). In addition, you may define up to eight of your own custom characters to display anywhere on the LCD. An onboard piezospeaker provides audible output, with full control over tone note, scale and duration using ASCII characters Dec 208–232.

The LCDs currently for sale are updated to Revision F. Basic functionality remains the same, but power requirements and the layout of the backpack have changed. Please see the documentation for information on your model.

This device can be connected to a PC serial port using a MAX232 line driver. The circuit isn’t supported by Parallax, but it’s possible to make this connection with a few extra parts.

The Parallax Serial LCDs (liquid crystal displays) can be easily connected to and controlled by a microcontroller using a simple serial protocol sent from a single I/O pin. The LCD displays provide basic text wrapping so that your text looks correct on the display. Full control over all of their advanced LCD features allows you to move the cursor anywhere on the display with a single instruction and turn the display on and off in any configuration. They support visible ASCII characters Dec 32-127). In addition, you may define up to eight of your own custom characters to display anywhere on the LCD. An onboard piezospeaker provides audible output, with full control over tone note, scale and duration using ASCII characters Dec 208–232.

The LCDs currently for sale are updated to Revision F. Basic functionality remains the same, but power requirements and the layout of the backpack have changed. Please see the documentation for information on your model.

This device can be connected to a PC serial port using a MAX232 line driver. The circuit isn’t supported by Parallax, but it’s possible to make this connection with a few extra parts.

Web Site: www.parallax.com Office: (916) 624-8333 Forums: forums.parallax.com Fax: (916) 624-8003 Sales: sales parallax.com Sales: (888) 512-1024 Technical: support parallax.com Tech Support: (888) 997-8267 Parallax Serial LCD 2 rows x 16 characters, Non-backlit, with Piezospeaker ( 27976) 2 rows x 16 characters, Backlit, with Piezospeaker ( 27977) 4 rows x 20 characters, Backlit, with Piezospeaker ( 27979) The Parallax Serial LCDs are very functional, low-cost liquid crystal displays that can be easily interfaced to and controlled by a microcontroller using a I/O pin. The LCD displays provide basic text wrapping so that your text looks correct on the display. Full control over all of their advanced LCD features allows you to move the cursor anywhere on the display with a single instruction and turn the display on and off in any configuration. They support visible ASCII characters Dec 32-127, and in addition you may define up to eight of your own custom characters to display anywhere on the LCD. NOTE: If your Serial LCD Display does not have a speaker on the back, use the specifications and information in the Product Change Notice: Revision E and Earlier section on page 11. Features Clear 40-pixel characters (8 H x 5 W) Supports ASCII DEC characters 32-127 Define up to eight custom characters Automatic text wrapping Single command cursor placement Single command clears the display Define up to eight custom characters Select 2400, 9600, or 19,200 baud with switches on the back of the device Display type: STN, YG, positive transflective LCD Adjustable contrast knob on the back of the device YG LED for backlit model displays Key Specifications Power requirements: o Non-backlit: +5 VDC, 20 mA o Backlit: +5 VDC, 20 mA (light off), ~ 80 mA typical (light on) Communication: Selectable asynchronous serial baud rates: 2400, 9600, 19200 Operating temperature: -4 to +158 F (-20 to +70C) Dimensions: NOTE - Board and LCD size and style may vary o 2x16: Approx. 1.42 x 3.15 in (36 x 80 mm) o 4x20: Approx. 2.37 x 3.86 in (60.2 x 98.1 mm) Copyright Parallax Inc. Parallax Serial LCDs ( 27976, 27977, 27979) v3.1 3/11/2013 Page 1 of 11 Quick-Start Circuit The Serial LCDs should be powered from an external regulated 5 V power supply. Make sure the power supply has an adequate current rating to power the Serial LCD and the BASIC Stamp, Propeller chip, or whichever microcontroller and other devices you are using. CAUTION DO NOT PROVIDE A SIGNAL TO THE RX PIN BEFORE APPLYING 5 VDC TO THE 5V PIN. Baud Rate Setup After connecting the Serial LCD, you will need to select the baud rate at which you are going to send it data. You have three choices: 2400, 9600, and 19,200 baud. To set the baud rate, move the dip switches on the back of the LCD into the correct positions according to the table next to the switches, which is also repeated below: MODE SW1 SW2 Test OFF OFF 2,400 ON OFF 9,600 OFF ON 19,200 ON ON As you can see from the table, there is also a fourth choice called Test. Use this Test mode to confirm that the power and ground to the LCD are hooked up correctly before you send it any data. Move the dip switches to the Test setting and turn on the power. The LCD display should turn on with the backlight on (models 27977, 27979) and display the following text: Parallax, Inc. www.parallax.com If you dont see the text at first, try adjusting the LCD contrast by turning the pot labeled Increase Contrast with a screwdriver. Turn it in the direction of the arrow to make the characters show up more clearly. If you still dont see the characters, go back and check your electrical connections and try again. Once youve successfully completed test mode, move the dip switches to the correct positions to select the baud rate you want to use for your application. Copyright Parallax Inc. Parallax Serial LCDs ( 27976, 27977, 27979) v3.1 3/11/2013 Page 2 of 11

Comparison of parallax-barrier and lenticular autostereoscopic displays. Note: The figure is not to scale. Lenticules can be modified and more pixels can be used to make automultiscopic displays

A parallax barrier is a device placed in front of an image source, such as a liquid crystal display, to allow it to show a stereoscopic or multiscopic image without the need for the viewer to wear 3D glasses. Placed in front of the normal LCD, it consists of an opaque layer with a series of precisely spaced slits, allowing each eye to see a different set of pixels, so creating a sense of depth through parallax in an effect similar to what lenticular printing produces for printed productslenticular lenses for other displays. A disadvantage of the method in its simplest form is that the viewer must be positioned in a well-defined spot to experience the 3D effect. However, recent versions of this technology have addressed this issue by using face-tracking to adjust the relative positions of the pixels and barrier slits according to the location of the user"s eyes, allowing the user to experience the 3D from a wide range of positions.

The principle of the parallax barrier was independently invented by Auguste Berthier, who published an article on stereoscopic pictures including his new idea illustrated with a diagram and pictures with purposely exaggerated dimensions of the interlaced image strips,Frederic E. Ives, who made and exhibited a functional autostereoscopic image in 1901.

In the early 2000s, Sharp developed the electronic flat-panel application of this old technology to commercialization, briefly selling two laptops with the world"s only 3D LCD screens.Tridelity and SpatialView. Similarly, Hitachi has released the first 3D mobile phone for the Japanese market under distribution by KDDI.Fujifilm FinePix Real 3D W1 digital camera, which features a built-in autostereoscopic LCD measuring 2.8" diagonal. Nintendo has also implemented this technology on its portable gaming consoles, the New Nintendo 3DS and the New Nintendo 3DS XL, after first including it on the previous console, the Nintendo 3DS.

The technology is harder to apply for 3D television sets, because of the requirement for a wide range of possible viewing angles. A Toshiba 21-inch 3D display uses parallax barrier technology with 9 pairs of images, to cover a viewing angle of 30 degrees.

The slits in the parallax barrier allow the viewer to see only left image pixels from the position of their left eye, right image pixels from the right eye. When choosing the geometry of the parallax barrier the important parameters that need to be optimised are; the pixel – barrier separation d, the parallax barrier pitch f, the pixel aperture a, and the parallax barrier slit width b.

The closer the parallax barrier is to the pixels, the wider the angle of separation between the left and right images. For a stereoscopic display the left and right images must hit the left and right eyes, which means the views must be separated by only a few degrees. The pixel- barrier separation d for this case can be derived as follows.

The pitch of a parallax barrier should ideally be roughly two times the pitch of the pixels, but the optimum design should be slightly less than this. This perturbation to the barrier pitch compensates for the fact that the edges of a display are viewed at a different angle to that of the centre, it enables the left and right images target the eyes appropriately from all positions of the screen.

a). If the parallax barrier had exactly twice the pitch of the pixels, it would be aligned in synchronisation with the pixel across whole of the display. The left and right views would be emitted at the same angles all across the display. It can be seen that the viewer’s left eye does not receive the left image from all points on the screen. The display does not work well. b). If the barrier pitch is modified, the views can be made to converge, such that the viewer sees the correct images from all points on the screen. c). Shows the calculation which determines the pitch of the barrier that is needed. p is the pixel pitch, d is the pixel barrier separation, f is the barrier pitch.

In a parallax barrier system for a high-resolution display, the performance (brightness and crosstalk) can be simulated by Fresnel diffraction theory.

Note that the parallax barrier may also be placed behind the LCD pixels. In this case, light from a slit passes the left image pixel in the left direction, and vice versa. This produces the same basic effect as a front parallax barrier.

In a parallax barrier system, the left eye sees only half the pixels (that is to say the left image pixels) and the same is true for the right eye. Therefore, the resolution of the display is reduced, and so it can be advantageous to make a parallax barrier that can be switched on when 3D is needed or off when a 2D image is required.

One method of switching the parallax barrier on and off is to form it from a liquid crystal material, the parallax barrier can then be created similar to the way that an image is formed in a liquid crystal display.

An autostereoscopic display that is switchable between 2D and 3D. In 3D mode the parallax barrier is formed with an LC cell, in a similar way to how an image is created on an LCD. In 2D mode the LC cell is switched into a transparent state such that no parallax barrier exists. In this case the light from the LCD pixels can go in any direction and the display acts like a normal 2D LCD.

A diagram showing how 3D can be created using time multiplexed parallax barrier. In the first time cycle, the slits in the barrier are arranged in a conventional way for a 3D display, and the left and right eyes see the left and right eye pixels. In the next time cycle, the positions of the slits are changed (possible because each slit is formed with an LC shutter). In the new barrier position, the right eye can see the pixels that were hidden in the previous time cycle. These uncovered pixels are set to show the right image (rather than the left image which they showed in the previous time cycle). The same is true for the left eye. This cycling between the two positions of the barrier, and the interlacing pattern, enables both eyes to see the correct image from half the pixels in the first time cycle, and the correct image from the other half of the pixels in the other time cycle. The cycles repeats every 50th of a second so that the switching is not noticeable to the user, but user has the impression that the appearance each eye is seeing an image from all the pixels. Consequently, the display appears to have full resolution.

In a standard parallax barrier system, the viewer must position themselves in an appropriate location so that the left and right eye views can be seen by their left and right eyes respectively.

In a ‘tracked 3D system’, the viewing freedom can be increased considerably by tracking the position of the user and adjusting the parallax barrier so that the left and right views are always directed to the user"s eyes correctly. Identification of the user"s viewing angle can be done by using a forward-facing camera above the display and image-processing software that can recognise the position of the user"s face. Adjustment of the angle at which the left and right views are projected can be done by mechanically or electronically shifting the parallax barrier relative to the pixels.

The visibility of crosstalk (ghosting) increases with increasing contrast and increasing binocular parallax of the image. For example, a stereoscopic image with high contrast will exhibit more ghosting on a particular stereoscopic display than will an image with low contrast.

Measurement of crosstalk in 3D displays. Crosstalk is the percentage of light from one view leaking to the other view. The measurements and calculations above show how crosstalk is defined when measuring crosstalk in the left image. Diagrams a) sketch the intensity measurements that need to be made for different outputs from the 3D display. Table b) describe their purpose. Equation c) is used to derive the crosstalk. It is the ratio of the light leakage from the right image into the left image, but note that the imperfect black level of the LCD is subtracted out from the result so that it does not change the crosstalk ratio.

The first fully developed "Parallax barrier displays" have precision slits as one of the optical components over the pixels. This blocks each image from one eye and shows it to the other.

The newest and most convenient displays, in products such as the Nintendo 3DS, HTC Evo 3D, and LG Optimus 3D, do not have the parallax barrier in front of the pixels, but behind the pixels and in front of the backlight. The entire LCD matrix is therefore exposed to both eyes, but as seen from each eye"s position only one of the interlaced images in it is backlit. Glare from the visibly lit pixel columns tends to make the adjacent unlit columns less noticeable.

Yamamoto, Hirotsugu (Oct 2000). "Optimum parameters and viewing areas of stereoscopic full colour LED display using parallax barrier". IEICE Trans Electron. E83-c no 10.

- Parallax, Inc inafanya tillverkar ndogo na zana za maendeleo ya microcontroller. LCD, AppKits na bidhaa zingine zinazohusiana zinapatikana pia. Parallax, Inc inazalisha kompyuta za single-bodi za BASIC Stamp® pamoja na zana za maendeleo kwa wadogo wadogo wadogo wadogo wa PIC12 / 16Cxx®.

The Parallax Serial LCDs are very functional, low-cost liquid crystal displays that can be easily interfaced to and controlled by a microcontroller using a I/O pin. Code examples are included for the BASIC Stamp® and Propeller™ chip. The LCD displays provide basic text wrapping so that your text looks correct on the display. Full control over all of their advanced LCD features allows you to move the cursor anywhere on the display with a single instruction and turn the display on and off in any configuration. They support the same visible characters as the BASIC Stamp Editor"s Debug Terminal (ASCII Dec 32-127). In addition, you may define up to eight of your own custom characters to display anywhere on the LCD.This device can be connected to a PC serial port using a MAX232 line driver.