Display Subpixel Electrode Layout for Brightness Uniformity
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Solution Overview
Problem
The brightness inconsistency between green sub-pixels in a pixel arrangement structure of a display device due to varying parasitic capacitance, leading to display uniformity issues and bright spots missing detection.
Innovation Solution
Designing a display substrate where the light-emitting element of one sub-pixel covers the gate electrode of the drive transistor of that sub-pixel and the light-emitting element of the adjacent sub-pixel also covers the gate electrode of its drive transistor, thereby equalizing parasitic capacitance and ensuring consistent pixel brightness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the light-emitting element of one sub-pixel covers the gate electrode of the drive transistor of that sub-pixel, then the parasitic capacitance of that sub-pixel increases, but the brightness consistency between adjacent sub-pixels deteriorates
Solution Approach 1:
The patent applies local quality by making the gate electrode structures of different sub-pixels non-uniform. Specifically, the gate electrode of the first green sub-pixel has a different configuration (different area or shape) compared to the gate electrode of the second green sub-pixel. This local variation compensates for the inherent parasitic capacitance differences caused by the overlapping structure, thereby achieving brightness consistency across adjacent sub-pixels while maintaining the space-saving benefits of the overlapping design.
2Manufacturing precision
If pixels are reduced in size to improve resolution, then the spacing between pixels is reduced, but the parasitic capacitance effect becomes more significant
Solution Approach 1:
The patent applies parameter changes by adjusting the physical parameters of the gate electrode (such as area, shape, or position) to compensate for the increased parasitic capacitance effect in high-resolution displays. By changing the gate electrode parameters locally for different sub-pixels, the invention maintains brightness uniformity even when pixel sizes are reduced and spacing is minimized to achieve higher resolution.
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 approach enhances display uniformity and improves the display effect by ensuring consistent pixel brightness across sub-pixels, addressing the brightness difference and enhancing overall display quality.
Implementation Method 1
light-emitting materials having high color purity and emission efficiency are used
Data Source
Figure 1~2
Figure 3A
Figure 3B
AI summary
A display substrate, a preparation method thereof, a display panel, and a display device are provided. The display substrate (100) includes a base substrate (10) and a repeating unit (11), the repeating unit (11) includes a plurality of sub-pixels (12) including a first sub-pixel (G1) and a second sub-pixel (G2), a color of light emitted by a light-emitting element (120a) of the first sub-pixel (G1) is identical to a color of light emitted by a light-emitting element (120b) of the second sub-pixel (G2), a shape of a first light-emitting voltage application electrode (1201a) of the light-emitting element (120a) of the first sub-pixel (G1) is different from a shape of a first light-emitting voltage application electrode (1201b) of the light-emitting element (120b) of the second sub-pixel (G2), and each sub-pixel (12) includes a light-emitting element (120) and a pixel circuit (121) for driving the light-emitting element (120) to emit light, an orthographic projection of the first light-emitting voltage application electrode (1201a) of the light-emitting element (120a) of the first sub-pixel (G1) on the base substrate (10) at least partially overlaps with an orthographic projection of a control terminal of a drive circuit (122a) of a pixel circuit (121a) of the first sub-pixel (G1) on the base substrate (10), an orthographic projection of the first light-emitting voltage application electrode (1201b) of the light-emitting element (120b) of the second sub-pixel (G2) on the base substrate (10) at least partially overlaps an orthographic projection of a control terminal of a drive circuit (122b) of a pixel circuit (121b) of the second sub-pixel (G2) on the base substrate (10).