Adaptive LC Voltage Control for Sunlight Readable Displays
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Solution Overview
Problem
Portable electronic devices with LCDs face challenges in maintaining clear display visibility under bright sunlight due to high brightness requirements, which lead to power consumption issues and eye irritation.
Innovation Solution
A display method that adjusts the liquid crystal (LC) driving voltage based on ambient light sensor values and image content, increasing the voltage proportionally when light levels exceed a certain threshold, and adjusts the gamma curve to enhance transmittance and brightness, while maintaining power efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the backlight brightness of the display is increased to generate less reflected light, then the visibility of the display under glaring light is improved, but the power consumption increases significantly
Solution Approach 1:
The patent applies dynamics by making the LC driving voltage adjustable and adaptive to ambient light conditions. The system dynamically changes the driving voltage based on ambient light sensor readings, transitioning from a fixed voltage system to a flexible, condition-responsive system that optimizes performance for each lighting environment.
Solution Approach 2:
The core invention involves changing the physical parameter of LC driving voltage to control liquid crystal transmittance. By adjusting this voltage parameter, the system modifies the optical properties of the liquid crystal layer, enabling variable light transmission that adapts to different ambient lighting conditions without requiring proportional increases in backlight power.
2Illumination intensity
If the backlight brightness is maintained at a high level to ensure visibility, then the display remains visible under sunlight, but the user experiences eye irritation
Solution Approach 1:
The system changes the LC driving voltage parameter to control the transmittance of the liquid crystal layer. This allows precise adjustment of display brightness independent of backlight intensity, enabling the display to achieve appropriate brightness levels for comfortable viewing without the harmful effects of excessive overall light output.
3Illumination intensity
If the LC driving voltage is increased to improve transmittance and brightness, then the display visibility under sunlight is enhanced, but the power consumption increases
Solution Approach 1:
The system implements dynamic voltage adjustment where the LC driving voltage is continuously adapted based on ambient light conditions. The voltage increases only when and to the extent necessary for sunlight readability, rather than maintaining a constantly high voltage level, thus achieving brightness improvement while minimizing power consumption.
Solution Approach 2:
The patent applies partial action by increasing the LC driving voltage only to the degree necessary for sunlight readability. The system uses ambient light sensors to determine when voltage adjustment is needed and applies just enough voltage increase to achieve adequate transmittance, avoiding excessive voltage application that would unnecessarily increase power consumption.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The method improves screen brightness and visibility under bright sunlight conditions while reducing power consumption, allowing for clear display in various ambient light environments.
Implementation Method 1
a liquid crystal layer 132 on the second substrate 122. The first substrate 121, the second substrate 122, and the liquid crystal layer 132 therebetween form a liquid crystal display
Data Source
AI summary
A display method for sunlight readable is provided, which is applicable to an electronic device having a display panel. The display method includes the following steps. An ambient light sensor value and image content are obtained. Next, a liquid crystal (LC) driving voltage is altered based on the ambient light sensor value and the image content, wherein the LC driving voltage is increasingly proportional to the ambient light sensor value and exceeds a normal operation driving voltage when the ambient light sensor value exceeds a high luminance value. Then, the display panel is drived under the LC driving voltage. Finally, a sunlight readable image is displayed on the display panel.