Display Panel Channel Width Compensation for Splicing Brightness
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Solution Overview
Problem
Existing display panels experience uneven brightness due to variations in the impedance ratio between shared and secondary pixel thin film transistors caused by lens splicing in exposure machines, leading to differences in potential and brightness between splicing and non-splicing areas.
Innovation Solution
The display panel design includes sub-pixel units with a first thin film transistor having a channel divided into sub-channels, an auxiliary electrode, and a third thin film transistor, which reduces the width variation at splicing areas, thereby minimizing the impedance ratio difference and potential variations between splicing and non-splicing areas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a multi-lens splicing structure is used in the exposure machine, then the productivity and manufacturing efficiency are improved, but the manufacturing precision of the channel width varies in the splicing area
Solution Approach 1:
The patent applies local quality by designing different channel widths for transistors in different exposure areas. Specifically, transistors in the splicing area A1 are given a first channel width, while transistors in the non-splicing area A2 are given a second channel width. This compensates for the exposure difference caused by the multi-lens splicing structure, ensuring uniform impedance ratios across the entire display panel.
2Ease of manufacture
If the channel width varies in the splicing area, then the exposure process is simplified, but the impedance ratio between transistors becomes non-uniform
Solution Approach 1:
The patent changes the channel width parameter based on the exposure area. By adjusting the channel width (a key parameter) differently for splicing and non-splicing areas, the patent compensates for the exposure variations. This maintains uniform impedance ratios without complicating the exposure process, as the width variation is intentionally designed rather than being a process defect.
3Illumination intensity
If the channel width is increased to compensate for splicing area exposure loss, then the brightness uniformity is improved, but the transistor size increases
Solution Approach 1:
The patent applies local quality by selectively increasing the channel width only in specific transistors located in the splicing area, rather than uniformly increasing all transistor dimensions. This targeted approach compensates for exposure loss in critical areas while minimizing the overall increase in transistor area and maintaining display uniformity.
Data Source
AI summary
The present application provides a display panel and a display device. In the display panel, a first channel is divided into the first sub-channel and the second sub-channel, so that a variation in a width of a channel of a first thin film transistor is greater than a variation in a width of a channel of a second thin film transistor, thereby reducing a variation in the impedance ratio between the second thin film transistor to the first thin film transistor, such that a difference in brightness between a secondary pixel in the sub-pixel unit corresponding to the splicing area and a secondary pixel in the sub-pixel unit corresponding to the non-splicing area reduced, thus improving the problem of the uneven brightness of the display panel.