Display Substrate Touch Electrode Layout for Light Leakage Control
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Solution Overview
Problem
The integration of touch functionality in liquid crystal display panels leads to interference between data lines and touch electrodes, causing electric field disturbances that result in pixel light leakage.
Innovation Solution
The design incorporates touch electrodes multiplexed as common electrodes with touch signal lines having a wider width than the slits between them, ensuring the touch signal lines overlap and shield the electric field, preventing interference and light leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If touch electrodes are integrated with data lines in the liquid crystal display panel, then the panel can implement both touch function and display function, but electric field interference occurs between data lines and touch electrodes causing pixel light leakage
Solution Approach 1:
A shielding layer is introduced as an intermediary component between the data lines and touch electrodes. This shielding layer acts as a mediator that blocks electric field interference from the data lines from reaching the touch electrodes, thereby preventing pixel light leakage while maintaining the integrated touch and display functionality.
Solution Approach 2:
The harmful electric field interference is extracted and isolated by separating the touch electrode structure into multiple components (touch electrodes and shielding layers). The shielding layer is specifically extracted to handle the interference problem, allowing the touch function to be maintained while eliminating the harmful electromagnetic interaction.
2Object-affected harmful factors
If shielding layers are added between data lines and touch electrodes, then electric field interference is reduced, but device structure becomes more complex
Solution Approach 1:
The shielding layer is merged with existing structural elements of the display panel. Instead of adding completely separate shielding components, the design integrates shielding functionality into the existing layer structure, combining multiple functions (shielding, structural support, electrical isolation) into unified elements to minimize additional complexity.
Solution Approach 2:
The shielding layer is designed to serve multiple functions simultaneously: it provides electric field shielding, acts as a structural element of the panel, and can serve as an electrical isolation layer. This multi-functionality reduces the need for additional dedicated components, thereby limiting the increase in device complexity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration effectively shields the electric field, preventing light leakage and maintaining display quality by ensuring the touch signal lines cover the slits and overlap with touch sub-electrodes, thus enhancing the display effect.
Implementation Method 1
the touch signal lines have a width in the second direction greater than a width of the first slit in the second direction... effectively shields the electric field, preventing light leakage
Data Source
AI summary
A display substrate, including: a substrate; and a plurality of data lines each extending in a first direction, a touch layer, and a plurality of touch signal lines, sequentially arranged away from the substrate, wherein the touch layer includes a plurality of touch electrodes configured to be multiplexed as common electrodes and each including a plurality of touch sub-electrodes electrically connected to each other; wherein the touch sub-electrodes are arranged in an array along the first direction and a second direction intersected with each other, a first slit is between any two adjacent touch sub-electrodes along the second direction, and orthographic projections of the first slit and a corresponding data line on the substrate overlap each other; the touch signal lines are connected to the touch electrodes, and at least one touch signal line has a width in the second direction greater than that of the first slit.