Display Panel Photocurrent Sensors for Ambient Light Contrast Compensation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional mobile terminals exhibit non-uniform contrast between blocked and non-blocked areas when exposed to ambient light, requiring users to manually obstruct light to enhance image contrast.
Innovation Solution
A display panel with photocurrent sensors and a sub-pixel driving circuit that detects ambient light levels and adjusts brightness uniformly across areas, using metal oxide photocurrent sensors and oxide TFTs to convert light into electrical signals for compensation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If conventional mobile terminals are used outdoors with ambient light, then the display can be viewed, but the contrast in blocked area and non-blocked area becomes non-uniform
Solution Approach 1:
The patent divides the display area into multiple sub-pixel areas with independent brightness control. By segmenting the display into independently controllable regions, the system can apply different brightness compensation to blocked and non-blocked areas, resolving the contrast uniformity issue while maintaining overall brightness.
Solution Approach 2:
The patent implements a feedback mechanism where ambient light sensors detect the actual light conditions in different areas, and the controller adjusts the brightness of sub-pixel areas based on this feedback. This closed-loop control ensures that contrast uniformity is maintained despite varying ambient light conditions.
2Reliability
If users block ambient light with hands or objects to enhance image contrast, then contrast in blocked area improves, but brightness uniformity between blocked and non-blocked areas deteriorates
Solution Approach 1:
The patent applies different brightness compensation strategies to different regions of the display. The blocked area receives one level of compensation while the non-blocked area receives different compensation, allowing each region to have optimal contrast while maintaining overall brightness uniformity across the entire display.
Solution Approach 2:
The patent dynamically changes the brightness parameter of different sub-pixel areas based on detected ambient light conditions and blocking status. By adjusting brightness parameters independently for blocked and non-blocked areas, the system maintains both contrast quality and brightness uniformity simultaneously.
3Reliability
If photocurrent sensors and sub-pixel driving circuit are added to detect and compensate ambient light, then contrast uniformity improves, but device complexity increases
Solution Approach 1:
The patent combines the photocurrent sensors and sub-pixel driving circuit into an integrated structure where sensor elements are directly coupled with pixel control circuits. This merging reduces the number of separate components and interconnections, lowering overall device complexity while maintaining the contrast uniformity function.
Solution Approach 2:
The patent designs the sub-pixel driving circuit to serve multiple functions: it drives the display pixels and simultaneously processes signals from the photocurrent sensors for ambient light detection and compensation. This multi-functionality eliminates the need for separate dedicated sensor processing circuits, reducing device complexity.
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 solution ensures uniform contrast between blocked and non-blocked areas by compensating the brightness of non-blocked areas, enhancing visibility and user experience in varying light conditions.
Implementation Method 1
a plurality of photocurrent sensors, wherein the photocurrent sensors are disposed in the light detecting areas and are connected to the sub-pixel driving circuit
Implementation Method 2
the photocurrent sensors include a gate line layer, a tunnel layer, and a source/drain electrode layer which are stacked, and a material of the tunnel layer includes metal oxide
Data Source
AI summary
The disclosure provides a display panel and a terminal device. The display panel includes an array substrate, wherein the array substrate includes a plurality of sub-pixel areas, a sub-pixel driving circuit is disposed in the sub-pixel areas, and a plurality of light detecting areas are disposed between adjacent sub-pixel pixel areas; a plurality of photocurrent sensors, wherein the photocurrent sensors are disposed in the light detecting areas and are connected to the sub-pixel driving circuit; a display device layer, wherein the display device layer is disposed on the array substrate and the photocurrent sensors; and a first controller, wherein the first controller is connected to the sub-pixel driving circuit. The photocurrent sensors detect a brightness of ambient light entering the light detecting areas and convert photo signals into electrical signals. Then, a blocking area and a non-blocking area are recognized by the first controller.