Display Photosensor Integration via Light-Obstructing Layer
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Solution Overview
Problem
Conventional liquid crystal displays lack the ability to automatically adjust display brightness in response to environmental conditions, leading to suboptimal viewing experiences.
Innovation Solution
A display panel design incorporating a photosensor with a photodiode between a transparent electro-conductive layer and a light-obstructing layer, coupled with a control chip, allows for automatic brightness adjustment based on ambient light levels without significantly altering the panel's thickness or affecting display quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a photosensor is added to enable automatic brightness adjustment, then the adaptability to environmental conditions is improved, but the device complexity increases
Solution Approach 1:
The patent combines the photosensor function with the existing transparent electro-conductive layer and light-obstructing layer of the display panel. The photosensor is integrated between these existing layers, merging the ambient light detection function into the existing display structure rather than adding a separate external component, thereby improving adaptability while minimizing increases in device complexity
Solution Approach 2:
The transparent electro-conductive layer and light-obstructing layer serve dual purposes: they maintain their original functions in the display panel structure while also serving as electrode components for the integrated photosensor. This multi-functionality allows the same structural elements to contribute to both display operation and ambient light sensing, resolving the contradiction between added adaptability and device complexity
2Ease of manufacture
If the photosensor is integrated between existing layers, then the ease of manufacture is improved, but the measurement precision of ambient light may be affected
Solution Approach 1:
The patent positions the photosensor between the transparent electro-conductive layer and the light-obstructing layer, using these existing structural elements as intermediaries. The transparent electro-conductive layer allows ambient light to pass through to the photosensor, while the light-obstructing layer prevents display backlight from interfering with the photosensor's ambient light measurement, thereby maintaining measurement precision while facilitating easy integration into the existing manufacturing process
Solution Approach 2:
The light-obstructing layer is strategically positioned and designed with specific optical properties to selectively block display backlight while allowing ambient light to reach the photosensor. This local optimization of light blocking characteristics ensures that the photosensor receives accurate ambient light measurements without interference from the display's own backlight, resolving the contradiction between ease of manufacture and measurement precision
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
This solution enables dynamic brightness adjustment, enhancing viewing comfort by accurately responding to environmental light conditions while maintaining the display's original thickness and performance.
Implementation Method 1
The photosensor comprises a photodiode. The area of the PN junction of the photodiode is relatively large in order to receive the incident light.
Data Source
AI summary
A display panel includes a first substrate, a second substrate, active switches, pixel electrodes, a color filter layer, a light-obstructing layer, a control chip and at least one photosensor. The second substrate is disposed opposite to the first substrate. The active switches are disposed on the second substrate, and each of them comprises an electro-conductive channel. The pixel electrodes are disposed on the second substrate and coupled to the active switches. The color filter layer is disposed on the second substrate and corresponded to the pixel electrodes. The light-obstructing layer is disposed on the first substrate and disposed in correspondence with the electro-conductive channel. The light-obstructing layer covers the electro-conductive channel and is made of an electro-conductive material. The control chip is coupled to the light-obstructing layer. The photosensor is disposed between the first substrate and the light-obstructing layer.