Light-Emitting Panel Layout to Prevent Mini LED Lamp Shadow
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Solution Overview
Problem
Conventional Mini/Micro LED display devices face issues with low brightness in local regions due to the large size and black color of switching devices, which cause lamp shadow problems and affect the light-emitting effect.
Innovation Solution
A light-emitting panel with a base substrate, where driving transistors and light-emitting elements are arranged in an array, with a reduced number of driving transistors adjacent to each light-emitting element, minimizing the impact on light path and brightness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional switching devices (MOS transistors) are used to control light-emitting elements, then the switching function is achieved, but the large size and black color of the switching devices cause local brightness reduction and lamp shadow problems
Solution Approach 1:
The switching device is changed from a conventional black MOS transistor to a transparent inversion-mode transistor. This color change from black to transparent allows light to pass through the switching device without being absorbed, thereby eliminating the lamp shadow problem while maintaining the switching function. The transparent characteristic of the inversion-mode transistor is the key implementation of this principle.
Solution Approach 2:
The patent changes the operational parameters of the switching device by using inversion-mode transistors with different electrical characteristics (threshold voltage, mobility, etc.) compared to conventional MOS transistors. This parameter change enables the switching device to maintain adequate switching performance while having a transparent appearance that does not block light, thus resolving the contradiction between switching reliability and local brightness.
2Illumination intensity
If the quantity of driving transistors adjacent to each light-emitting element is reduced, then the lamp shadow problem is alleviated, but the electrical connection and control complexity may increase
Solution Approach 1:
The patent merges the control function of multiple transistors into a single inversion-mode switching device. By using one transparent inversion-mode transistor to control multiple light-emitting elements (e.g., 2x2, 2x3, or 3x3 arrays), the design reduces the total number of switching devices needed while maintaining adequate control capability. This merging approach decreases the density of switching devices, reducing light blocking, while the combined control structure manages the electrical connection complexity.
3Illumination intensity
If transparent inversion-mode switching devices are used, then light transmission is improved, but the manufacturing process complexity increases
Solution Approach 1:
The patent replaces conventional MOS transistor fabrication processes with thin-film transistor (TFT) fabrication processes that inherently produce transparent devices. The TFT manufacturing process uses deposition and etching techniques to create inverted-channel transistors with transparent active layers, substituting the conventional silicon-based MOS process. This mechanical/chemical process substitution enables transparent switching devices while establishing a manufacturable fabrication workflow.
Data Source
AI summary
A light-emitting panel and a display device are provided. The light-emitting panel includes a base substrate, and a plurality of driving transistors and a plurality of light-emitting elements. One driving transistor is electrically connected to at least one light-emitting element. The plurality of light-emitting elements are arranged in an array to form one or more light-emitting element rows along a first direction and to form one or more light-emitting element columns along a second direction. In a direction parallel to a plane of the base substrate, the first direction intersects the second direction. In the direction parallel to the plane of the base substrate, a quantity of driving transistors adjacent to one light-emitting element is A, where A<2 and A is an integer.