Display Substrate Anode Layout for Uniform Pixel Brightness
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Solution Overview
Problem
Existing display panels exhibit non-uniform brightness due to varying parasitic capacitances caused by different overlapping areas between anode structures and pixel driving circuits, leading to inconsistent luminance across the display.
Innovation Solution
The display substrate design includes first and second-type sub-pixels with specific overlapping and area ratios of anode structures and pixel driving circuit components, optimizing the layout to equalize capacitive loads and mitigate brightness non-uniformity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If different positions of opening regions of pixels are used, then pixel arrangement flexibility is improved, but parasitic capacitances become non-uniform leading to brightness non-uniformity
Solution Approach 1:
The patent applies local quality by making the anode structure extend to different degrees in different sub-pixels. Specifically, in first sub-pixels, the anode extends to a first degree overlapping the pixel driving circuit, while in second sub-pixels, the anode extends to a second degree (different from the first degree) overlapping the pixel driving circuit. This local differentiation compensates for the inherent non-uniformity caused by different pixel arrangements, achieving uniform brightness across all sub-pixels while maintaining arrangement flexibility.
2Quantity of substance
If anode structure overlapping with pixel driving circuit is increased, then capacitive load is increased, but brightness non-uniformity is worsened due to varying parasitic capacitances
Solution Approach 1:
The patent changes the parameter of anode extension degree to compensate for varying parasitic capacitances. By controlling the anode to extend to different degrees in different sub-pixels (first degree in first sub-pixels, second degree in second sub-pixels), the patent adjusts the capacitive load locally to achieve uniform brightness. This parameter adjustment compensates for the non-uniform parasitic capacitances inherent in different pixel arrangements.
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 optimized layout ensures uniform brightness by maintaining similar capacitive loads across sub-pixels, thereby enhancing display quality and reducing luminance inconsistencies.
Implementation Method 1
overlapping regions between the anode structures and lower pixel driving circuits have different areas, so that different parasitic capacitances are generated
Implementation Method 2
OLED (Organic Light Emitting Diode) is a current-type organic light emitting device, which has a phenomenon of luminescence caused by an injection and recombination of carriers with a luminous intensity proportional to the injected current
Data Source
AI summary
A display substrate is provided, including: a base substrate; and a first pixel driving circuit, a first anode structure, a second pixel driving circuit and a second anode structure arranged on the base substrate. An orthographic projection of the first anode structure on the base substrate at least partially overlaps an orthographic projection of a driving gate conductive portion of the first pixel driving circuit on the base substrate to form a third overlapping region. An orthographic projection of the second anode structure on the base substrate at least partially overlaps an orthographic projection of a driving gate conductive portion of the second pixel driving circuit on the base substrate to form a fourth overlapping region. A ratio of an area of the third overlapping region to an area of the fourth overlapping region ranges from 0.8 to 1.2.