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High-Brightness LCD Development Criteria

Views: 328     Author: Reshine Display     Publish Time: 2023-12-18      Origin: Site


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High-Brightness LCD Development Criteria

LCD panels with high brightness have become increasingly popular in recent years due to their feasibility and readability in bright environments. For an optimal user experience, many portable devices now feature high-brightness LCDs.

1. High-Brightness Limitations

Of course, LCD brightness has limits, but small LCD panels remain useful for a variety of portable devices. Engineers must keep in mind that increasing the brightness of LCDs will cause them to consume more power and generate more heat. As a result, if an indoor space lacks adequate lighting, the recommended LCD brightness should be close to 200 nits. Similarly, proper lighting in an indoor setting will require more than 300 nits of brightness. This applies to commercial buildings, medical labs, and security systems.

A display with a brightness of 700 nits or higher is generally considered sunlight readable. In high-brightness environments, any brightness less than 700 nits can make reading difficult or impossible. Companies can use a variety of techniques to achieve sunlight readability with this in mind.

2. Resistors and PWM

Engineers can use techniques such as pulse width modulation (PWM) and eliminate limiting resistors to achieve high brightness.

PWM allows your display to adjust its brightness based on its surroundings. This is advantageous for small, portable devices that are concerned about overheating and power consumption. When you use PWM, you can program your product so that when it is brought indoors, the brightness decreases, allowing the display to cool down and lowering the device's power consumption until it is time to go outside again.

Limiting resistors are used in circuits to reduce and/or regulate current. The backlight can draw more current by removing limiting resistors or decreasing the resistor value, increasing brightness. It is important to note, however, that removing limiting resistors can result in a shorter LED half-life.

3. Surface Preparation

Another thing that design engineers should think about is using anti-glare and anti-reflection treatments to improve the readability of LCD panels. If the surface of an LCD panel is anti-reflective, it will have a high readability. Anti-glare eliminates glare and balances reflections on LCD panels. The goal of AR is to reduce the amount of light that is reflected in the observer's eyes.

4. Optical Bonding

If your device has a touch panel or a cover glass, optical bonding can help improve display brightness. In several ways, a touch panel or cover glass can be attached to the LCD glass. However, optical bonding will be the best option for high-brightness displays.

Optical bonding eliminates the possibility of an air gap between the LCD glass and the cover/touch panel, resulting in higher contrast and lower internal reflections. Because the bonding is applied as a third layer between the LCD glass and the cover/touch panel, this is the case. A bonding method such as double-sided tape, on the other hand, is only applied to the outer perimeter of the display between the LCD glass and the cover/touch panel.

5. Ventilation Design And Structure

Another critical consideration for LCD manufacturers is proper ventilation. Under certain conditions, if your display is sunlight-readable, you may experience overheating. When the LEDs in a sunlight-readable backlight are activated, they can generate excessive heat. The heat produced can harm the LCD or any other components within the portable device. A proper ventilation design and structure in a portable device can assist in preventing overheating.

6. High-Brightness LCDs' Future

High-brightness LCDs have emerged as a new standard for attracting an audience. It's a positive step that will fuel the growth of more advanced small displays in the coming years. It is critical to understand that the brightness of a panel can range from hundreds to thousands of nits. However, when it comes to small displays with high brightness, quality must be balanced with functionality. In retrospect, the science and technology behind bright LCDs will continue to evolve and become more applicable in various industries. Related product: High Brightness Tft Lcd Display.

7. The Performance of LCDs at High Altitudes

LCDs (liquid crystal displays) have emerged as a critical component of the technology sector. The LCD has found its way into a wide range of applications, resulting in a wide range of temperature, pressure, and moisture requirements. While elevation does not directly affect LCD performance, other factors such as temperature, pressure, and cosmic rays can have an impact at high altitudes.

Cold temperatures at high altitudes can affect liquid crystals, which are typically in a state between liquid and solid, making them susceptible to freezing. Rugged enclosures/devices can have better insulation and heating elements to protect against extreme cold. LCDs can operate at temperatures ranging from -40°F to +176°F, depending on the manufacturer.

As the temperature drops, the liquid crystals become less viscous, resulting in "ghosting" or image burn through discoloration as well as slower response times. The response time will be reduced as the viscosity decreases. TFT, or Thin Film Transistor, displays, which maintain high response times in low-temperature environments because each pixel is driven by an individual transistor, are the best choice of display technology when high altitude performance is prioritized.

Finally, the mechanical stress of a display's seals can be caused by the low temperatures found at high altitudes. The stress can cause microfractures, which can allow moisture or other contaminants to enter and damage the display. Ingress of liquid or pressurized air can cause voiding, which are black void-like spots that damage the display and impair readability.

When it comes to the practical performance of displays, another important consideration is the display backlight function. Premature backlight failures are common because low temperatures at high altitudes cause the display to contract, requiring more backlight power and intensity to be legible.

A liquid crystal display (LCD) is sandwiched between two layers of glass. When exposed to high pressure, the physical composition of both the glass and the crystal is disrupted. This can result in pixel damage. Such elevated atmospheric pressure can be felt when flying from high to low altitude, which can leave a pressure mark on the display, crack the glass, or otherwise permanently damage the display.

When liquid freezes, it expands, distorts, and even cracks. If moisture is present within display components, sudden altitude changes will cause temperature-drop-related freezing, resulting in cracked displays or glass, pressure marks, or damaged pixels. LCDs designed to perform at high altitudes are typically housed in a specialized enclosure that can prevent moisture seepage.

Another factor to consider is the impact of reduced air density on thermal management.

Some LCDs rely on cooling hardware that degrades significantly at high altitudes. This can cause a decrease in the flow of air particles over hot components, resulting in thermal meltdowns. The heat generated by an LCD must be reduced when it is housed in an enclosure. This can be accomplished with cooling fans or air vents, but the lower air density at higher altitudes makes it difficult. When extreme elevations are expected, additional cooling hardware, such as air conditioning, can be used.

A rare but significant factor is the phenomenon known as cosmic rays. Cosmic radiation is a phenomenon caused by exploding stars outside of our solar system that has been shown to affect more than just LCDs. These rays are specifically known to affect the microprocessors of LCDs at high altitudes. Because cosmic radiation increases with altitude, it is more likely to affect LCD performance. Cosmic radiation can flip a "1" to a "0" in a processor's binary instructions, resulting in a screen malfunction. However, this is not a practical consideration because shielding electronics from the effects of cosmic radiation requires nearly 10 feet of concrete.

The LCD has been used in a variety of applications that require a wide temperature, pressure, and moisture range. While altitude has no direct effect on LCD performance, other factors such as temperature, pressure, and cosmic rays can. These variables can change depending on the rate of ascent or descent, changes in atmospheric pressure, and environmental conditions. Fortunately, Reshine Display offers a wide range of displays that can meet the majority of requirements, as well as custom solutions to ensure that your display works reliably at any elevation.

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