Micro LED Display Panel Shading Layer for Light Interference
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Solution Overview
Problem
Current amorphous silicon thin film transistor circuits on glass substrates lack the fine control necessary for high-resolution displays using small-sized light emitting diodes driven by low current, leading to challenges in improving display quality and current control accuracy.
Innovation Solution
A display panel comprising a substrate with micro light emitting diodes, driving chips, and a shading layer, where the micro light emitting diodes are positioned with their light emitting surfaces exposed and their thickness less than half that of the driving chips, and the shading layer covers the driving chips to prevent light interference and enhance contrast.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If amorphous silicon thin film transistor circuits are used on glass substrate, then the display panel can be manufactured with existing technology, but the current control accuracy is insufficient for high-resolution displays
Solution Approach 1:
The patent changes the material parameter of the transistor from amorphous silicon to oxide semiconductor (such as IGZO - indium gallium zinc oxide), which fundamentally improves the current control accuracy. This material substitution enables precise control of low currents required for micro LED display, directly resolving the contradiction between manufacturability and control precision.
2Manufacturing precision
If small-sized light emitting diodes are used for high-resolution display, then the display resolution is improved, but the light interference between adjacent pixels increases
Solution Approach 1:
The patent extracts the harmful light interference by introducing an opaque shading layer between adjacent micro LED pixels. This shading layer selectively blocks stray light from reaching neighboring pixels while maintaining the overall display structure, thus resolving the light interference problem without compromising the high-resolution advantage of small-sized LEDs.
3Ease of operation
If driving chips are placed on the display area, then the electrical connection to micro LEDs is achieved, but the driving chips generate heat that affects display quality
Solution Approach 1:
The patent introduces an opaque shading layer as an intermediary between the driving chips and the display area. This shading layer serves dual functions: it blocks light from reaching the driving chips (preventing photo-response interference) and acts as a thermal barrier to reduce heat transfer to the display area, thus resolving both the electrical connection need and the heat generation problem.
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 configuration improves the accuracy of current control and display quality by reducing light interference between pixels and protecting the driving chips from illumination, resulting in enhanced image contrast and reduced risk of micro light emitting diode damage during transfer.
Implementation Method 1
The shading layer is disposed on the first surface of the substrate and covers the driving chips, wherein the light emitting surfaces of the micro light emitting diodes are exposed by the shading layer
Data Source
AI summary
A display panel of micro light emitting diode comprises a substrate, a plurality of micro light emitting diodes, a plurality of driving chips and a shading layer. The substrate having a first surface and a display area. The plurality of micro light emitting diodes is disposed on the first surface of the substrate and is located in the display area, with each of the micro light emitting diodes having a light emitting surface while the light emitting surface is away from the first surface of the substrate. The plurality of driving chips is disposed on the first surface of the substrate and is located in the display area, with each driving chip electrically connecting to at least one of the micro light emitting diodes. The shading layer is disposed on the first surface of the substrate and covering the driving chips while exposing the light emitting surfaces.