Display Panel Capacitive Layout for Low-Grayscale Color Cast
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Solution Overview
Problem
Display panels experience a color cast problem due to differing capacitances of equivalent capacitors in light-emitting elements of different colors, leading to unequal brightness rise effects and noticeable color discrepancies, especially at low grayscales.
Innovation Solution
Adjust the capacitance of coupling capacitors between the scan signal line and light-emitting elements by varying the overlapping areas of conductive parts connected to these elements, ensuring the capacitance of the coupling capacitor for one color is larger than that of another, thereby equalizing brightness rise effects across different colors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the overlapping area of scan signal line and conductive part is increased for one color, then the capacitance of coupling capacitor increases, but the device complexity increases due to different overlapping areas for different colors
Solution Approach 1:
The patent applies local quality by creating different overlapping areas between the scan signal line and conductive parts for different color sub-pixels. Specifically, the first overlapping area (for first color) is designed to be different from the second overlapping area (for second color), which results in different capacitance values for different colors. This local differentiation compensates for the inherent capacitance differences of light-emitting elements of different colors, thereby improving color accuracy without requiring complete structural redesign
Solution Approach 2:
The patent changes the capacitance parameter of coupling capacitors by adjusting the overlapping area between scan signal lines and conductive parts. By modifying this geometric parameter, the capacitance values are tuned to compensate for the different capacitances of light-emitting elements of different colors. This parameter adjustment approach improves color accuracy while avoiding complex additional circuit structures
2Illumination intensity
If different capacitances are used for different color light-emitting elements, then brightness rise effects are equalized, but manufacturing precision requirements increase
Solution Approach 1:
The patent implements local quality by assigning different overlapping area dimensions to different color sub-pixels. The first overlapping area for the first color sub-pixel is specifically designed to be different from the second overlapping area for the second color sub-pixel. This localized structural differentiation creates the necessary capacitance variation to equalize brightness rise effects across different colors while maintaining a relatively simple overall structure that is amenable to manufacturing
Solution Approach 2:
The patent applies preliminary action by pre-designing and pre-compensating for the capacitance differences of different color light-emitting elements through carefully calculated overlapping areas. This compensation is built into the structure before operation, allowing the display to achieve uniform brightness rise across colors without requiring real-time adjustment or complex control mechanisms during manufacturing and operation
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 effectively reduces the color cast issue by equalizing brightness rise degrees across light-emitting elements of varying capacitances, improving color accuracy and reducing perceptible color discrepancies.
Implementation Method 1
a first scan signal line overlapped with and insulated from the conductive parts, wherein an overlapping area of the first scan signal line and the first conductive part is larger than an overlapping area of the first scan signal line and the second conductive part
Data Source
AI summary
The embodiments of the present application provide a display panel and a display apparatus. The display panel includes a plurality of light-emitting elements including a first-color light-emitting element and a second-color light-emitting element; a plurality of conductive parts electrically connected to the light-emitting elements, wherein in the plurality of conductive parts, a conductive part electrically connected to the first-color light-emitting element is a first conductive part, and a conductive part electrically connected to the second-color light-emitting element is a second conductive part; and a first scan signal line overlapped with and insulated from the conductive parts, wherein an overlapping area of the first scan signal line and the first conductive part is larger than an overlapping area of the first scan signal line and the second conductive part.