Pixel Circuit Parallel Transistor Layout for High-Brightness Displays
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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 display devices with high brightness requirements.
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 and current output capacity without abnormal transfer characteristics, allowing for higher driving current output.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the pixel circuit outputs a larger driving current to increase display brightness, then the brightness requirement is met, but the performance of the pixel circuit deteriorates
Solution Approach 1:
The first transistor is divided into multiple first sub-transistors (X≥2) connected in parallel. Each sub-transistor has a gate, first terminal, and second terminal. The gates are connected together, the first terminals are connected together, and the second terminals are connected together. This segmentation allows the pixel circuit to output larger driving current while maintaining good performance, as the parallel configuration increases the equivalent width-to-length ratio and current output capacity without causing abnormal transfer characteristics.
2Power
If a single transistor with large width-to-length ratio is used to increase driving current, then current output capacity increases, but transfer characteristics become abnormal
Solution Approach 1:
Instead of using a single transistor with large width-to-length ratio, the invention segments it into multiple first sub-transistors connected in parallel. Each sub-transistor maintains normal transfer characteristics, and when connected in parallel, they collectively provide the required large current output capacity without exhibiting abnormal transfer characteristics that would occur in a single oversized transistor.
Solution Approach 2:
Multiple first sub-transistors are merged in parallel connection to achieve the equivalent effect of a large width-to-length ratio transistor. The gates are connected together, first terminals are connected together, and second terminals are connected together, creating a combined structure that provides high current output while maintaining normal transfer characteristics of individual sub-transistors.
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.