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Sunlight Readable LCD & Transflective LCD Display

Sunlight Readable Display: Technologies & Solutions | Maclight

When the displays are used in outdoor, have you struggled to read the instructions on the display under sunlight? We could see a display that looked good in the outdoor, but the display image wash out in outdoor environment with high ambient sunlight. So for outdoor environment, we need sunlight readable displays. In this article, we would introduce technologies of sunlight readable displays and some tips for improving sunlight readable displays.

1. What is sunlight readable display?

Sunlight readable displays means the display that could be readable under sunlight, they are designed to operate in an outdoor setting or in direct sunlight. These products are designed to be very rugged and durable materials to meet the most challenging environmental conditions. A good sunlight readable display has the properties of high contrast under directly sunlight without blur, wide temperature range, lower heat emission and power saving, long life time.

sunlight readable display

2. What is the best sunlight readable display:

OLED display is the best sunlight readable display in display quality.

For industrial applications, after balance lifetime and display quality, Sunlight Readable LCD displays is the best solution for industrial outdoor displays.

  • OLED Display:
    1. High contrast and excellent image quality in direct sunlight.
    2. High cost.
    3. short lifetime
  • E-Paper Display:
    1. Power saving.
    2. Long reflesh time.
    3. High cost.
  • LED Display:
    1. Low resolution or PPI (beside micro-LED technology).
    2. High power consumption
  • sunlight readable lcd:

    1. The most suitable technology for sunlight readable displays,
    2. It balance display effect of sunlight readable, power saving, high resolution, colorful, fast response time, temperature range, touch panel optional, and cost.

Display technologies comparison:

Feature

OLED Display

E-paper (E-ink)

LED Display

Sunlight Readable LCD

Resolution

High

Low to medium

Medium to high

Medium to high

Contrast Ratio

Extremely high

High

Medium

Medium to high

Lifestime

Short

Very long

Long

Medium

Brightness

Low to medium

Very low

Very high

High

Power Efficiency

Low

Very low

High

Medium

Sunlight Readability

Good

Excellent

Excellent

Good

Display Quality

Excellent

Fair

Medium

Good

Resolution (PPI)

high

low

very low

high

Best Use Cases

Indoor premium devices(phones, TVs)

Static content(e-books, signage)

Outdoor ads, stadiums

Automotive, industrial outdoor display


3. Which is better sunlight readable LCD:

There are 3 type of sunlight readable LCDs:

High brightness LCD:

    1. High-brightness LCD displays use advanced backlighting technology on transmissive LCD panel, high brightness light compete the strong ambient's light in human's eyes visual system, make the LCD display content and image clearly viewable under sunlight.
    2. High brightness LCD displays is economy solution for color display in outdoor, with high resolution, full colors, economy.

Reflective lcd:

    1. Reflective lcd is without backlight unit and power saving. Reflect LCD reuse ambient light by polarizer, reflective light would increase the brightness of lcd screen and reduce the ambient light on the screen.
    2. Reflective LCDs are the economy solutions for monochrome sunlight readable displays.
    3. Reflective LCD technology is not suitable for color tft displays, due to the color filter inside tft panel,  the transmissive rate of TFT panel is much lower than monochrome lcd, the reflective light brightness is too low to use for reflective TFT.
    4. Reflective LCD it can not use in dark environment, it is only used for outdoor with strong ambient light,because without backlight reflecting, we can not see the display content from reflective LCD in dark environment.

transflective lcd:

    1. Transflecive LCD display combine the functions of transmissive LCD and reflective LCD displays. In dark environment, mainly use transmissive mode. In outdoor with strong sunlight, mainly use transflective mode.
    2. Transflective lcd displays have monochrome transflective LCD ( use transflective polarizer technology) and color transflective tft LCD (transflective TFT panel technology).
    3. Transflective LCD is better for outdoor displays or handset display that require low power consumption.

Conclusion:

Both Transflective LCDs and high brightness LCDs are suitable for sunlight readable displays. (Check which is better for "Transflective LCD vs. high brightness LCD" )


4. What Makes Sunlight Readable LCD: Challenges, Principles & Solutions

4.1 Challenges for sunlight readable displays:

Overcoming Environmental Obstacles, displays face 3 major visibility challenges in bright outdoor environments:

  • Glare and Reflections: Sunlight reflecting off the screen surface reduces effective contrast.(typically 2%-8% reflectivity,depend on the surface treatment) .The reflected light will superimpose with the light emitted by the display screen, reducing the effective contrast (that is, the difference in brightness between the displayed content and the background).
  • Ambient Light Interference: Display brightness must compete with reflected light—if too low, content becomes washed out. The brightness of the display screen needs to be high enough so that the light it emits can overpower the reflection interference from the surrounding environment and form a recognizable image.
    If the display screen brightness is insufficient (for example, 100 nits), the reflected light (assuming 5% ambient light, i.e. 500 lux × 5% = 25 nits) may directly cover the displayed content, resulting in "inability to see clearly".
  • Extreme Temperatures: High/low temperatures can impact brightness and response time

4.2  Principles: How sunlight readable LCD display works

The Principle is visibility depends on whether the display’s brightness and contrast surpass ambient light levels and human eye perception thresholds:

  • Key Principle: Display luminance must significantly exceed reflected ambient light. That means an object’s brightness and contrast is higher than its ambient light, and the different ratio must be higher than human being eyes’ viewing threshold.
  • Human Eye Perception (Weber-Fechner Law) https://pmc.ncbi.nlm.nih.gov/articles/PMC1994651/,The human eye's perception of brightness is not linear; instead, it follows an approximate rule similar to the Weber-Fechner Law - the logarithm of the perceived brightness change is proportional to the actual brightness change.
    • In bright light, the eye’s sensitivity threshold rises—requiring higher display brightness. When the intensity of ambient light is extremely high (such as when sunlight is directly shining), the human eye significantly increases the threshold for sensitivity to brightness (that is, a higher display brightness is required to be perceived as "visible")
    • In dim environments, the sensitivity threshold of the human eye decreases (a lower display brightness can be clearly perceived).
  • Contrast decline is also related ambiend brightness and display brightness: High-brightness displays maintain contrast better under strong light.
    • The display ambient contrast is declined as the ambient illumination increased, they are inverse relationship.
    • The display with lower brightness, the contrast declined faster than higher brightness display.
sunlight readable lcd display

4.3 Solutions for Sunlight Readable LCD display:

  • Boost Screen Brightness:
    • High-Brightness displays (exceeding 1000 nits) compete reflections from strong sunlight.
  • Minimize Ambient Light Reflection
    • Anti-Reflective Coatings: Surface treatments (e.g., AG & AR glass) cut reflectivity.
    • Polarization Filters: Block specific reflection angles by using circular polarizer. (please check "surface treatment technology for sunlight readable displays").
    • OCA bonding: OCA bonding for capacitive touch sunlight readable LCD displays
  • Reuse ambient light for sunlight readable displays
    • Transflective LCDs: Combine backlight with ambient light reflection for adaptability.
    • Reflective LCD Displays: Rely entirely on ambient light, ideal for low power.


5. What we need to concern the sunlight readable LCD for industrial applications:

  • Brightness design: If it is transmissive display, choose the high brightness display refer to ambient illumination.

Ambient Condition

Ambient  Brightness

Recommended brightness for sunlight readable Display (Transmissive lcd)

Thin bright overcast sky,

indirect sunlight, shadows are visible

3000 to 7000 nits

500 - 800 nits

Directly sunlight in blue sky,

shadow are clearly

7,000 to 10,000 nits

800 - 1000 nits

  • Concern reflective ratio: For transflective display or reflective lcd, the higher reflective ratio would be benefit to sunlight readability.
  • Low power consumption: We have to consider power consumption for sunlight readable displays, especially for the devices with battery charge, such as hand held devices
  • Wide Temperature and water proof: Choose -30°C to +80°C wide temperature displays to stand outdoor environment and fast response LCD materials. use IP65/IP67 for water proof device.
  • Long MTBF and Life time: Choose the long life time and MTBF sunlight displays for outdoor application. The LED chips and backlight lifetime would be decreased by long working in high brightness.


6. Maintenance of Sunlight Readable LCD Displays:

A good maintenance would lengthen the lifetime of sunlight readable LCD displays, so we suggest:

  1. Add heat dissipation design for sunlight readable LCD displays if possible.
  2. Add a shield for sunlight readable display, such as digital kiosk display in the outdoor,with IP65/IP67 water proof case.
  3. Use Auto-dimming technology, add light sensor for sunlight readable lcd displays, the display brightness could be auto-adjusted following the ambient light. Light off it when sunlight display is no need on working.
  4. Keep the sunlight readable LCD display's brightness less than 80% maximum of its design value.


7. Find a reliable Sunlight readable lcd displays supplier.

Maclight display is profession in sunlight readable displays, ISO9001 certified, we provide 1.8 "~24" sunlight readable LCD display for industrial outdoor kiosk display, HMI displays and marine displays. we offer:

  1. High brightness TFT LCD displays up to 1500 nits by our advance backlight technology. PWM and auto-dimming technology, power saving 40%+.
  2. Long lifetime and -30°C to +80°C wide temperature sunlight readable LCD displays, MTBF up to 50,000+ hours.
  3. Exclusive small and medium-sized of transflective TFT LCD solutions, 1.75"~5" transflective TFT LCD with low power consumption for outdoor displays.
  4. Resistive and capacitive touch screen add-on, advance surface treatment and OCA bonding technology (Advance optical bonding technology: AOT, and AG, AR ,AF surface treatment).
  5. Complete customization including size, interface (SPI, RGB, HDMI, UART), touch technology, and environmental protection.


  • Transflective TFT LCD display
  • 240*320 resolutions

3.5 in sunlight readable LCD displays transflective

  • 3.5 inch high brightness TFT LCD displays:

  • Brightness up to 1000 cd/m2


Click and Check Maclight's sunlight readable LCD displays products list =>:

Please contact us for more sunlight readable displays products and get the quotation,

Email us : [email protected]


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