Array Substrate Light-Detecting Circuit for Display Uniformity
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Solution Overview
Problem
Conventional display panels, particularly OLEDs, suffer from luminance and chromaticity non-uniformity due to manufacturing process instability, parameter drift, and device aging, leading to inconsistent light emission across sub-pixels.
Innovation Solution
An array substrate with integrated light-detecting circuits, including photosensitive elements and auxiliary circuits, detects light emitted from each sub-pixel in real-time, allowing for immediate compensation to ensure uniform luminance and chromaticity across the display panel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional display panels are used without light-detecting circuits, then the device complexity is low and manufacturing is simple, but luminance uniformity deteriorates due to manufacturing process instability, parameter drift, and device aging
Solution Approach 1:
The patent merges the light-detecting function with the display panel by integrating photosensitive elements directly into the pixel structure. The photosensitive element is formed in the same semiconductor layer as the driving transistor, sharing common electrodes and circuit elements. This integration approach adds detection capability without significantly increasing overall device complexity, as the detection and driving functions coexist within the same pixel region using shared structural components.
Solution Approach 2:
The patent implements multi-functionality by designing the photosensitive element to serve dual purposes: detecting light emitted from the light-emitting region for luminance sensing, and simultaneously serving as part of the pixel circuit structure. The same photosensitive element can detect light for compensation purposes while being integrated into the existing pixel architecture, allowing one component to fulfill multiple functional roles and reducing the need for separate dedicated detection structures.
2Measurement precision
If photosensitive elements are disposed between the base substrate and the luminescent material layer, then light detection accuracy is improved, but the area of the light-emitting region deteriorates due to space occupation in the pixel structure
Solution Approach 1:
The patent implements nesting by placing the photosensitive element within the light-emitting region in a nested configuration. The photosensitive element is formed in the semiconductor layer beneath the luminescent material layer, with its active area overlapping the light emission path. This nested arrangement allows the detection function to be embedded within the existing light-emitting structure, maximizing space utilization. The photosensitive element detects light as it passes through or reflects from the luminescent layer, enabling accurate measurement without requiring separate dedicated detection areas that would reduce the light-emitting region.
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 enables real-time detection and compensation of light intensity variations, effectively addressing luminance and chromaticity non-uniformity issues caused by threshold voltage drift, carrier mobility differences, and manufacturing process inconsistencies, resulting in improved display panel uniformity.
Implementation Method 1
a photosensitive element and an auxiliary circuit coupled to the photosensitive element, the photosensitive element located in the light-emitting region of the at least one pixel region
Data Source
AI summary
An array substrate, a display panel, a light-detecting method for a display panel, and a method for controlling a display panel are provided. The array substrate includes a base substrate; a plurality of pixel regions arranged in an array on the base substrate, the pixel regions each including a light-emitting region; and a light-detecting circuit in at least one pixel region, the light-detecting circuit configured to detect light emitted from the light-emitting region of the at least one pixel region in which the light-detecting circuit is provided.