Display Device External Light Synchronization for Contrast
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Solution Overview
Problem
Current display technologies face challenges in achieving high contrast ratios in real-world environments due to the influence of external light, as existing methods either increase power consumption or are costly, and do not effectively account for ambient light conditions during contrast ratio measurements.
Innovation Solution
A display device and control method that synchronously controls the switching or illumination intensity of external light by generating alternating light source control signals to manage the operation states of external and backlight modules, thereby optimizing contrast and reducing power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the brightness of the white image is increased to improve contrast ratio, then the contrast ratio increases, but the power consumption of backlight modules increases significantly
Solution Approach 1:
The patent applies periodic action by alternately switching the backlight module and external light module on and off in different cycles. During first cycles, the backlight module is turned on while the external light module is turned off. During second cycles, the backlight module is turned off while the external light module is turned on. This periodic switching allows the display to maintain high contrast ratio by controlling light sources in alternating periods without requiring continuous high power consumption from both sources simultaneously.
2Illumination intensity
If dynamic contrast technologies are used to solve contrast related problems, then the contrast ratio improves, but the cost of the display device increases
Solution Approach 1:
The patent merges the control of the backlight module and external light module into a unified control system. The control module receives image signals and generates control signals that coordinate the operation of both light modules based on the same timing cycles. This integrated approach achieves dynamic contrast improvement without requiring separate complex control systems for each light module, thereby reducing overall device cost and complexity.
3Illumination intensity
If the brightness of the black image is decreased to improve contrast ratio, then the contrast ratio increases substantially, but the display performance in bright environments deteriorates
Solution Approach 1:
The patent implements dynamics by making the light source configuration adaptable and changeable based on operating conditions. The control module dynamically switches between different light source configurations (backlight only, external light only, or both) based on the timing cycles and environmental conditions. This dynamic adaptation allows the display to achieve high contrast in normal conditions while maintaining adequate brightness performance in bright environments by selectively activating the external light module.
Data Source
AI summary
A display device capable of controlling an external light and a control method are provided. Image display of the display device and the external light are synchronously controlled through a synchronization signal generated by a control module in the display device. The control module generates a first and a second light source control signal during first cycles and second cycles of the synchronization signal. The first and the second light source control signal are used to control the external light to operate at a first operation state and at a second operation state respectively. Through the techniques of controlling the external light by the display device, i.e. turning off or reducing illumination intensity of the external light every other specific period, both influence of the external light on contrast ratio and light reflection from the display device are reduced. Power of the external light is also saved.