Display Mode Switching for Low Ambient Light Dazzle Reduction
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Solution Overview
Problem
Mobile terminals struggle to adapt to extremely low ambient light conditions, as existing night modes that adjust backlight brightness and UI background color are insufficient in reducing display dazzle.
Innovation Solution
A method and apparatus for mode switching that involves receiving ambient light intensity values to determine if they are below a threshold, enabling a night mode by scaling voltages to data lines of a liquid crystal display screen and reducing backlight brightness, using predetermined ratios and correspondence relationships to adjust display settings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If backlight brightness is reduced to lowest level and UI background is altered to black or dark tones, then display adaptability to low ambient light is improved, but display dazzle is still too strong when ambient light brightness is extremely low
Solution Approach 1:
The patent changes the control parameter from backlight brightness and UI background color to grayscale voltage scaling. By scaling the grayscale voltage to data lines of the liquid crystal display screen according to a predetermined ratio, the display can achieve lower effective brightness levels that were not attainable through backlight control alone, thereby reducing display dazzle in extremely low ambient light conditions.
Solution Approach 2:
The patent introduces dynamic mode switching between first control mode (backlight control) and second control mode (grayscale voltage control) based on ambient light intensity thresholds. This dynamic adaptation allows the display system to select the most appropriate control strategy for current lighting conditions, optimizing both adaptability and reducing harmful dazzle effects.
2Measurement precision
If two control modes are introduced (backlight control and grayscale voltage control), then display control precision in low light is improved, but device complexity increases
Solution Approach 1:
The patent uses ambient light intensity as a dynamic trigger to switch between control modes. When ambient light intensity exceeds a threshold, the system operates in first control mode using backlight control. When the threshold is not exceeded, it switches to second control mode using grayscale voltage scaling, thereby achieving precise control adaptation without requiring complex simultaneous multi-mode operation.
Solution Approach 2:
The patent changes the fundamental control parameter from backlight brightness to grayscale voltage scaling ratio. By scaling the voltage to data lines according to a predetermined ratio in the second control mode, the system achieves finer display brightness control precision that is particularly effective in low ambient light conditions, while maintaining a relatively simple implementation through parameter transformation.
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
Effectively reduces display brightness by reducing grayscale voltage and backlight brightness, improving adaptability to low ambient light conditions and enhancing user experience by minimizing screen dazzle.
Implementation Method 1
backlights of a liquid crystal display screen are controlled in order to control a display brightness of the liquid crystal display screen
Data Source
AI summary
Method and apparatus for mode switching are provided in the disclosure. Aspects of the disclosure provide a method for switching a display mode of a device. The method includes receiving an intensity value of ambient light when the device is in a first control mode in which backlights of a liquid crystal display screen are controlled in order to control a display brightness of the liquid crystal display screen, determining whether the intensity value is less than a predetermined threshold, and when the intensity value is less than the predetermined threshold, controlling the device to enter a second control mode in which voltages provided to data lines of the liquid crystal display screen are scaled according to a ratio in order to control the display brightness of the liquid crystal display screen.