optically bonded lcd monitors free sample

The Direct Bond removes two internal reflective surfaces by eliminating the air gaps between the LCD surface and the rear side of the outer glass or plastic substrate. AR (Anti-Reflective) or AG (Anti-Glare) coatings on the front surface increase the contrast ratio even further. A 20% improvement in contrast ratio is typical with this treatment.

Impact testing has shown significant improvement with a direct bonded front surface vs. an “adhered” – frame/gasket configuration with no bonding interlayer

Optically bonding an LCD, OLED or Plasma display improves both optical performance and durability. By selecting an appropriate adhesive that matches the index of refraction of the flat panel and the overlay, General Digital is able to remove all of the air gaps, thus reducing the number of internal reflecting surfaces that can lead to degradation of optical performance. Providing a durable adhesion between the flat panel and the overlay improves the displays’ ability to resist shock, vibration and moisture.

On the practical side, the adhesive must also provide adequate bond strength, have a reasonable pot life after preparing, not present any health or safety issues, be available at reasonable cost from reliable sources, and cure to the proper finished bond condition using temperatures and times that are friendly to optical bonding facilities. Fortunately, there exist a relatively large number of choices. Typical bonded overlays include contrast enhancement filters, EMI/RFI filters, vandal shields, touch screens, and thermal heaters.

Bonded display assemblies mimic shatterproof glass. Although the bonded overlay can fracture from impact, the adhesive prevents/minimizes broken pieces from becoming airborne and endangering the operator and other nearby personnel.

The in-the-frame design is currently in limited production, primarily for avionic applications. The adhesive is epoxy, which was selected so that the bezel could be affixed to the display’s metal frame, with the bonded antireflective glass extending into the opening, reducing any issues of viewing angle and parallax to the display.

One drawback to the under-the-frame and in-the-frame bonds is that they are not suitable for making a liquid-proof seal to the bezel of the monitor. To accomplish this, monitor builders usually prefer to form a seal to the antireflective glass. In this case, an over-the-frame bond is necessary. This bond design is also required in the case of an optically bonded touch sensor. The details of the bond may vary slightly, depending on the nature of the overlay. However, in general, an appropriate gasket is placed onto the face of the OEM frame, forming a well-defined bond thickness and protecting the edge of the seal from abrasion.

It is, of course, possible to bond more than one overlay to the display. A specific example is the use of a conductive glass to control EMI, which is bonded to a touch sensor. As of this writing, General Digital Optical Bonding Laboratories has produced over 475 displays of this design for an aerospace application.

This bond design is the preferred over-the-frame bond. A gasket is applied between the LCD, OLED or Plasma display and the overlay and the space between them is then filled with adhesive.

The strength of VacuBond® dry optical bonding becomes evident when bonding electronic paper, which, in contrast to a TFT displays, has no mechanically stable structure, and no bezel. The high-tech silicone OPTαGEL® securely connects the e-paper with a protective glass, or foils to a unit. The smooth surface of the e-paper is susceptible to scattered light and reflections, which is further exacerbated by the air gap between the e-paper, and a tape-bonded protective glass. The OPTαGEL®fills this air gap, reduces reflections, prevents the ingress of moisture, and dirt, thus ensuring a high-contrast display of the e-paper contents. In addition to protective glass, Apollo displays also bonds foils that evenly distribute the light of the front lighting. Not only is our OPTαGEL® long lasting, but e-paper bonding process is reversible, too.

Optical bonding is an adhesive process used to bond a protective clear cover screen or layer to an underlying LCD panel. Use of this method of bonding will typically eliminate the air gap between the two layers, and can result in greatly improved screen visibility (see picture above). Silicone solutions, such as OCR (optically clear resin) or LOCA (liquid optically clear adhesive) are strong candidates to consider for optical bonding applications due to their overall design flexibility, as well as their tendency to remain clear over long time periods.

Increasing screen sunlight readability means to raise its extrinsic contrast ratio. It can be achieved by increasing LCD backlight or reducing the reflected light brightness, or both.

However, increasing the backlight, the power consumption also will rise; LCD heating will effect on its reliability. Consequently, reducing the reflected light brightness is the most effective way to tackle those problems.

Bonding touch screen or cover lens to the polarizer of LCD front side with clear optical adhesive. Since the refractive index of the optical glue is same to cover glass, both are 1.5, thus eliminating two reflective surfaces.the lower reflection, the higher contrast ratio is. Backlight 500 lumens can read in daylight; backlight 800 lumens can read under strong light.

11.6inch Capacitive Touch Screen LCD, with Case and Toughened Glass Cover, 1920×1080, HDMI, IPS, Optical Bonding Screen, Various Systems & Devices Support, Including Raspberry Pi, Jetson Nano, PC...

Vacuum bonding (also direct dry optical bonding) allows for a zero optical defect production and provides perfect material stability without yellowing. Also modern sleek TFT displays, which do not feature a sturdy bezel, can be bonded with this fully automated production process without any problems.

The strength of VacuBond® dry optical bonding becomes evident in the bonding of electronic paper, which, in contrast to TFT displays, has no mechanically stable structure and no bezel. The high-tech silicone OPTαGEL®securely connects the e-paper with a protective glass or foils to a unit. The smooth surface of the e-paper is susceptible to scattered light and reflections, which is further enhanced by the air gap between the e-paper and a tape-bonded protective glass. The OPTαGEL® fills this air gap, reduces reflections, prevents the ingress of moisture and dirt and ensures a high-contrast display of the e-paper contents. In addition to a protective glass, we also bond foils that evenly distribute the light of the front lighting. Of course, the e-paper bonding process is reversible, too.

All other OCAs failed when bonded to a special plastic material, but Free Crystal was the only one to pass. Until now, we have been considering OCA for each components, but we expect that Free Crystal will be able to handle a wide range of components and shorten the examination time.

SRMOB-19U are 19″ sunlight readable LCD displays with the addition of Optical Bonding. They feature at least 1000 nits brightness! They are  4:3 aspect ratio.  We design the SRMOB-19U 19″ 1000 nits displays for use in direct sunlight. Consequently, they are also perfect for other high ambient-light conditions. They utilize state-of-the-art LED backlights. The SRMOB-19B produce at least 1,000 nits brightness. In contrast, this is over 3 to 5 times brighter than standard monitors.  For example, standard monitors are  only 200-300 nits brightness. Therefore, the result is an amazingly bright screen.  This will provide you with crystal-clear images, even with bright, direct sunlight on the face of the screen.

The SRMOB-19U 19″ sunlight readable LCD feature Anti-Reflective glass to protect the LCD panel. The glass also reduces unwanted surface reflections. However, the glass also introduces internal reflections. Therefore, TRU-Vu daylight readable monitors include Optical Bonding. This process injects an optical-grade resin into the air gap between the LCD panel and the glass, and completely fills the gap. The Optical Bonding eliminates the internal reflections and increases the contrast ratio, thereby greatly improving image quality. Optical Bonding also eliminates moisture and condensation beneath the glass.

These 19″ sunlight readable LCD are extremely rugged. For instance, we build them with true industrial-grade components. Furthermore, they receive our exclusive TRU-Tuff treatment. The TRU-Tuff process includes RTV silicone on all connections and critical components. Additionally, all wires are dressed, tie-wrapped and secured. Lastly,  we apply ThreadLock to all screws.  The rugged ABS enclosure ensures maximum shock and vibration resistance for this rugged 1000 nit monitor.

We design the SRMOB-19-U High Brightness Display Series to operate in nearly any environmental conditions.  Whether in frigid conditions or blazing heat, these sunlight displays will survive and thrive. To clarify, these monitors will operate in temperatures down to -22°F (-30°C).  They will also withstand brutal heat.  Moreover, operating  temperatures go up to 185°F (85°C).  The rugged ABS enclosures assures these 19″high brightness displays will provide years of reliable imaging performance.  Specifically, typical MTBF for these monitors is 50,000 hours.

Our 19″ sunlight readable LCD 1000 nit monitors have been deployed in a wide range of demanding industries. For example, military, law enforcement,  aviation and entertainment benefit. They are also deployed in inspection, marine  cranes, and transportation.  TRU-Vu monitors are backed by our full 3-Year Warranty.  This ensures you of many years of reliable service.

See our full line-up of industrial-grade Sunlight Readable and Daylight Readable. This highlights all of our high brightness monitors. Additionally, you’ll find the sunlight readable touch screens in all the sizes and configurations available. We offer over 540 models of touch screens and monitors. Use our Advanced Search Tool to help you hone down the choices. You may filter by features important to you. See all mid-sized monitors, or view only those monitors that operate on 24VDC.TRU-Vu can provide modified or Custom OEM LCD Displays.  Private Label Monitors are also an option if you have very specific requirements.

But what makes screen displays worth buying? From a consumer perspective we focus on appearance, app functionality, and quality depending on the device. OEM screen manufactures and engineers not only have to understand consumer demands but also design screens that are durable to withstand the environments they are used and installed in. Common challenges in the display panel industry include adhesive bond strength, adhesion to narrow bond lines, optically clear adhesives, while limiting material and adhesive waste.

3M™ Optically Clear Adhesives- 8211, 8212, 8213, 8214 and 8215 are unique clear free-film bonding adhesives that do not require an adhesive carrier. Optically clear adhesives are contaminant free resulting in improved bubble resistance on glass or plastic film cover laminations exposed to high temperature and high humidity: a common requirement in automotive display screen fabrication. Optical clear adhesives are ideal for LCD flat panel displays, touch screens, transparent graphic overlays, and other devices requiring an optically clear bond.

15inch Capacitive Touch Monitor Optically bonded, Anti-glare surface, 10-Finger-Multi Touch Panel, USB-Touch connection, Windows /Android/Linux/mac supported, IP65 Front / IP40 Back, 1024*768, cover glass with 7H surface hardness

For foldable AMOLED (OLED) display panels, the repeated folding and unfolding create new mechanical requirements and challenges beyond those of fixed displays. In most applications, the multiple functional layers of a foldable display are bonded by optically clear adhesives (OCA) to form a multilayered thin panel or film stack that is flexible to allow folding of the panel.

The folding of a multilayered panel will introduce bending stress and shear stress not only within the individual layers but also between the bonded layers. Depending on the panel layup design, these bending stresses can reach very high levels causing various failures including fracture of individual layers or sensitive components within a layer, delamination, and buckling. Understanding the nature of these stresses will help in producing robust designs that ensure reliable folding performance.

The folding of a multilayered panel will introduce bending stresses, both in-plane tensile or compressive stresses and shear stresses between the layers. While each individual layer is flexible to withstand being folded into a small radius of curvature, the bonded multilayer panel will exhibit a much higher stiffness due to the larger thickness of the whole panel, and potentially generate very high bending stresses. The high bending stresses may cause failure in various forms. Of the various components and layers in an OLED display panel, the permeation barrier layer, the indium tin oxide (ITO) layer, and the oxide dielectric layers of thin film transistors (TFT) are sensitive to tensile stress and strain, and they can fracture at a relatively low tensile strain [24, 36].

In the finite element analysis (FEA) presented here, a simplified 7-layer film stack was used to represent a foldable OLED display (Table 2). The film stack was assumed to be attached to two rigid back plates joined by hinges. The center portion of the film stack was not attached to the rigid back plate to allow for folding of the stack. The folding action simulated here is the so-called ‘out-folding’ such that the film stack is folded towards its back layer. In the fully folded configuration, the space between the straight sections of the outer layer is 10 mm resulting in the bend section of the film stack forming an approximate semi-circle of radius 5 mm as shown in Figure 8. In the simulation, the film stack was folded in 3 s, then held in the folded configuration for 24 h before it was unfolded in 3 s. The material properties and the thickness of each layer used in this work are listed in Table 2. The total thickness of the film stack simulated here was 0.475 mm (layup 1) and 0.275 mm (layup 2). The simulation was repeated for the two film stack layups bonded by 3M™ Foldable OCA CEF35 and 3M™ OCA 8211. 3M™ CEF35 has a lower storage modulus than that of 3M™ OCA 8211, and exhibits a more elastic behavior as indicated by its lower Tan delta value (Table 2) than that of 3M™ OCA 8211.

Contour plots of in-plane bending strain in the OLED layer when the film stack is fully folded for the film stacks bonded by 3M OCAs (only the OLED layer is shown in this figure).

Displacement contour plots comparison of buckling of the film stack bonded by 3M™ CEF35 and 3M™ OCA 8211 immediately after unfolding showing the improved buckling resistance of 3M foldable OCA. The displacement, U2, is in the direction perpendicular to the film surface (unit: mm).

Predicted local buckling on a film stack bonded with an OCA with a stiffness of 10% of that of 3M™ CEF35. The inserts are the photos of a local buckling on the actual film stack.

Simulation results showing the effect of OCA thickness on local buckling. The film stacks shown here were bonded with 3M OCA of different thickness. The ratios of the surface layer thickness to the underlying OCA layer thickness is 2.0 for the layup on the left, and 1.0 for the layup on the right.

In Figure 12, the shear stress of the film stack is shown for the transition region where the bent section meets the straight section. The corresponding shear strain values are indicated on the plots. Figure 13 shows the shear stress at the end of the film stack. For both the film stacks bonded by 3M™ CEF35 and 3M™ OCA 8211, along the length of the film stack, the maximum shear strain occurs in the transition region. The higher the shear strain in the OCA, the more shear slip is allowed between layers, which reduces the bending stress in the layers. For the layers on the compressive side of the neutral plane, this means reduced compressive stress and the reduced possibility of local buckling of these layers. For the layups simulated in this work, the shear strain can be as high as 600% as shown in Figure 12. The softer 3M™ CEF35 allows not only large shear strain upon folding leading to improved local buckling resistance, it also can effectively resist debonding due to its high bond strength (Figure 13).

EIZO has an in-house production line for optical bonding - a method with which to provide increased visibility and durability to LCD monitors. Producing optical bonding in-house allows EIZO to continue to meet the needs of maritime, medical, and other specialty markets while ensuring each product maintains high quality standards.

There is a small gap of air that lies between the LCD module and the cover glass or touch panel of a monitor. Optical bonding is a process in which a layer of resin is used to fill the gap, adhering the two together.

By adhering the LCD module and panel together with optical bonding, the transmission of light is increased, improving the visibility of the display. This is useful when viewing a monitor with bright ambient lighting conditions.

There are many different types of mechanism designs for LCD panels in the market: with metal frame, without metal frame (Black Tape), Open Cell, etc. AMT optical bonding can support all of them. Based on the structure and size of the touch panel and LCD panel, AMT will choose the most suitable thickness of SOCA for lamination. For optical bonding, AMT can provide Lucent Gel in different thicknesses, including 0.5mm, 0.8mm, 1.0mm, 1.2mm, and 1.5mm. If a thicker SOCA is required, we will discuss closely with the customers to fit their needs.

Some LCD panels on the market tend to have a narrow frame design. When the frame of the LCD panel is very narrow with a thicker SOCA, after optical bonding, a bright line at the edge of the active area might be seen when looking at the LCD panel sideways. AMT uses a special process and optical bonding technology to remove the bright line when you look at it sideways.

Some LCD panel bonding is not necessarily bonding a touch panel, it may use just a cover glass or other plastic material to protect the LCD panel. On the other hand, some products are designed with a three-dimensional plastic mechanism, which cannot use the usual flat lamination process. Not to mention the plastic material is easily deformed by the increase of temperature, and the black plastic mechanism absorbs all the light, and bonding material cannot be cured by UV during lamination. AMT optical bonding technology can provide an excellent solution for this kind of design. We have unique optical bonding technology with specially designed bonding jigs and Lucent Gel, which can work with plastic mechanisms or three-dimensional frames. We can also bond glass or other plastic materials to LCD panels.

In optical bonding, the jig design has a great impact on the bonding solution. AMT has strong jig design capabilities, we are equipped with a variety of tool machines for jig production. On top of that, AMT has a great reputation in experience, technology, and services in the touch-field. Our optical bonding is produced in high-quality, in-house, can be quickly bonded, and provides customers one stop service with comprehensive technical support. To further expand our optical bonding services, we have moved this factory team to our new additional branch-Xizhi in Taiwan. If your products have small orders or need short lead times, AMT is a great choice for you!