Ambient-Sensing Gamma Voltage Control for Display Brightness
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Solution Overview
Problem
Display devices struggle to maintain optimal display brightness across varying ambient light conditions, such as day and night, leading to inadequate image visibility.
Innovation Solution
A display device with multiple light emitting units and an ambient light sensor that adjusts Gamma voltage groups based on detected ambient light brightness, allowing operation in different modes to enhance brightness range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If emission duty ratio is adjusted to maximum value, then display brightness is maximized, but image visibility in high ambient light conditions remains insufficient
Solution Approach 1:
The patent changes the Gamma voltage parameter dynamically based on ambient light conditions. By detecting ambient light brightness and selecting from multiple pre-stored Gamma voltage groups, the system adjusts the voltage applied to light emitting units to achieve optimal display brightness and contrast ratio in different lighting environments, resolving the contradiction between maximum brightness and visible image quality.
2Illumination intensity
If display brightness is increased to match high ambient light, then visibility in bright conditions improves, but display brightness range becomes insufficient for low light conditions
Solution Approach 1:
The patent implements dynamic adaptation by continuously monitoring ambient light conditions and switching between multiple Gamma voltage groups. This dynamic adjustment enables the display to automatically optimize its brightness range according to the current lighting environment, achieving both high brightness visibility in bright conditions and appropriate brightness range in low light conditions.
Solution Approach 2:
The system changes the Gamma voltage parameter dynamically based on ambient light conditions. By detecting ambient light brightness and selecting from multiple pre-stored Gamma voltage groups, the system adjusts the voltage applied to light emitting units to achieve optimal display brightness and contrast ratio in different lighting environments, resolving the contradiction between maximum brightness and visible image quality.
3Adaptability or versatility
If multiple Gamma voltage groups are implemented, then display brightness range is enhanced, but device complexity increases
Solution Approach 1:
The patent applies preliminary action by pre-storing multiple Gamma voltage groups in the Gamma voltage controller before actual operation. These pre-calculated voltage groups correspond to different ambient light conditions and are ready for immediate selection, eliminating the need for complex real-time calculations and reducing operational complexity while maintaining enhanced brightness range adaptability.
Data Source
AI summary
A display device including a plurality of light emitting units, an ambient light sensor, and a Gamma voltage controller including a plurality of Gamma voltage groups is provided. The Gamma voltage groups includes a first Gamma voltage group and a second Gamma voltage group provided to the light emitting units respectively in a first operating mode and a second operating mode. The first Gamma voltage group includes a first voltage and a second voltage respectively corresponding to a lowest gray level and a highest gray level in the first operating mode, and the second Gamma voltage group includes a third voltage and a fourth voltage respectively corresponding to a lowest gray level and a highest gray level in the second operating mode. An absolute value of a difference between the first voltage and the second voltage is greater than that between the third voltage and the fourth voltage.