AMOLED Sub-Pixel Electrode Layout for Uniform Brightness
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Solution Overview
Problem
In active-matrix organic light-emitting diode (AMOLED) display panels, the brightness difference between sub-pixels due to varying parasitic capacitances affects display uniformity and brightness detection, leading to issues like missing bright spots and inconsistent pixel brightness.
Innovation Solution
The display substrate design includes a base substrate with repeating units of sub-pixels, where each sub-pixel has a light-emitting element and a pixel circuit, with the light-emitting element featuring a first and second light-emitting voltage application electrode, and the orthographic projection of these electrodes overlaps with the control terminal of the pixel circuit, reducing parasitic capacitance differences between sub-pixels by ensuring consistent pixel brightness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the light-emitting element structure is optimized for brightness, then display quality improves, but parasitic capacitance variations cause brightness inconsistency between sub-pixels
Solution Approach 1:
The patent applies equipotentiality by designing the control terminal and light-emitting voltage application electrode to have overlapping orthographic projections, ensuring that both electrodes are at the same potential level relative to the base substrate. This configuration minimizes potential differences and parasitic capacitance variations between different sub-pixels, thereby ensuring consistent brightness across the display panel while maintaining high illumination intensity.
2Manufacturing precision
If pixel density is increased to improve resolution, then display quality improves, but parasitic capacitance effects become more significant causing brightness detection issues
Solution Approach 1:
The patent changes the geometric parameters of the electrode structure by creating overlapping orthographic projections between the control terminal and light-emitting voltage application electrode. This parameter modification reduces parasitic capacitance values, making them negligible even at high pixel densities, thereby enabling accurate brightness detection and maintaining display quality without brightness detection issues.
3Reliability
If electrode overlap area is increased to reduce parasitic capacitance, then brightness consistency improves, but device area increases
Solution Approach 1:
The patent transitions from a two-dimensional planar electrode arrangement to a three-dimensional overlapping structure by positioning the control terminal and light-emitting voltage application electrode such that their orthographic projections overlap on the base substrate. This dimensional change enables reduced parasitic capacitance and improved brightness consistency without requiring increased lateral device area, as the capacitance reduction is achieved through vertical stacking and projection overlap rather than lateral expansion.
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 design enhances display uniformity and improves the display effect by minimizing brightness differences between sub-pixels, effectively addressing the issue of inconsistent pixel brightness and improving detection accuracy.
Implementation Method 1
a light-emitting element and a pixel circuit for driving the light-emitting element to emit light
Data Source
AI summary
A display substrate, a preparation method thereof, a display panel, and a display device are provided. The display substrate includes a base substrate and a repeating unit, the repeating unit includes a plurality of sub-pixels including a first sub-pixel and a second sub-pixel, a color of light emitted by a light-emitting element of the first sub-pixel is identical to a color of light emitted by a light-emitting element of the second sub-pixel, a shape of a first light-emitting voltage application electrode of the light-emitting element of the first sub-pixel is different from a shape of a first light-emitting voltage application electrode of the light-emitting element of the second sub-pixel.