In-Cell Display Panel Layout for Higher Aperture and Touch Uniformity
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Solution Overview
Problem
In-cell touch display panels face a reduction in pixel aperture rate and light transmittance due to the integration of touch signal lines, leading to uneven display and decreased brightness.
Innovation Solution
The display panel design includes touch signal lines arranged such that their orthographic projections fall within the projections of pixel units, with data signal lines configured in non-collinear directions to avoid overlap with pixel electrodes, eliminating virtual touch signal lines and optimizing signal line arrangement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If touch signal lines are integrated into the display panel with virtual wiring to ensure coverage in each sub-pixel, then touch signal monitoring is improved, but pixel aperture rate decreases and light transmittance is reduced
Solution Approach 1:
The patent extracts and removes the virtual touch signal wiring from the display panel structure. By eliminating these unnecessary wiring layers and contact holes, the touch signal lines are simplified to only where truly needed, thereby removing the obstruction to light and increasing pixel aperture rate while maintaining touch functionality through the remaining essential signal paths.
2Measurement precision
If the number of touch signal lines is increased to raise touch block resolution, then touch precision is improved, but device complexity increases and pixel aperture rate decreases
Solution Approach 1:
The patent makes the data signal lines serve dual functions: they transmit display data signals to pixel electrodes and simultaneously function as touch signal lines for monitoring touch events. This multi-functionality allows the same physical wiring to achieve both display and touch sensing purposes, eliminating the need for separate dedicated touch signal lines and thereby maintaining touch precision without increasing device complexity.
Solution Approach 2:
The patent merges the touch signal line function with the existing data signal line structure. By integrating touch sensing capability into the data signal transmission pathways, the system combines two previously separate functions into a unified wiring system, reducing the total number of signal lines needed while maintaining both display performance and touch sensitivity.
3Reliability
If touch signal lines are arranged in traditional patterns, then touch signal transmission is ensured, but uneven display occurs due to presence or absence of lines in sub-pixels
Solution Approach 1:
The patent applies local quality by selectively positioning touch signal lines only in specific regions where they are functionally necessary, rather than uniformly distributing them across all sub-pixels. The data signal lines serve as touch signal lines in specific local areas, creating non-uniform but functionally optimized signal distribution that maintains display uniformity while ensuring reliable touch signal transmission where needed.
Data Source
AI summary
A display panel and a display device are provided. The display panel includes: multiple pixel units arranged adjacent to each other, located on a side of a substrate and including multiple pixel electrodes, in which the multiple pixel electrodes are arranged in an array to form pixel electrode rows and pixel electrode columns, and each pixel unit includes any two adjacent pixel electrode columns; touch signal lines, in which an orthographic projection of any touch signal line on the substrate falls within an orthographic projection of the pixel unit on the substrate; and first data signal lines, each first data signal line includes a first sub-data signal line segment and a second sub-data signal line segment, and an extension direction of the first sub-data signal line segment is non-collinear with an extension direction of and the second sub-data signal line segment.