Pixel Circuit Layout for High-Brightness Display Panels
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Solution Overview
Problem
Existing LED display panels face challenges in increasing the upper limit of driving current output by the pixel circuit while maintaining good performance, particularly in applications requiring high brightness.
Innovation Solution
The pixel circuit includes a first transistor composed of X first sub-transistors connected in parallel, which increases the equivalent width-to-length ratio without directly enlarging the channel width, thereby enhancing current output capacity and maintaining turn-on speed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the channel width of the first transistor is increased to output larger driving current, then the current output capacity is improved, but the turn-on speed decreases and performance deteriorates
Solution Approach 1:
The first transistor is divided into multiple parallel sub-transistors (first sub-transistors) instead of using a single large-channel transistor. This segmentation allows the equivalent width-to-length ratio to be increased for higher current capacity while keeping individual sub-transistor channels narrow to maintain fast turn-on speed. Each sub-transistor contributes to the total current output without sacrificing switching performance.
2Power
If the equivalent width-to-length ratio is increased to enhance current output capacity, then the driving current is improved, but the transistor channel width must be enlarged which affects performance
Solution Approach 1:
Instead of using a single transistor with large channel width, the invention segments the transistor into multiple parallel sub-transistors. This achieves the required equivalent width-to-length ratio for high current capacity while maintaining narrow individual channels that preserve performance characteristics. The segmented structure is more complex in configuration but simpler in maintaining performance parameters.
Data Source
AI summary
A display panel and a display device are provided. The display panel includes a pixel circuit; and a light-emitting unit. The pixel circuit includes a first node and a second node, the first node is electrically connected to a first power line, and the second node is electrically connected to the light-emitting unit. The pixel circuit includes a first transistor coupled between the first node and the second node, the first transistor includes X first sub-transistors, gates of the X first sub-transistors are connected, first terminals of the X first sub-transistors are connected, second terminals of the X first sub-transistors are connected, X≥2, and X is an integer.