In-Cell Touch Array Substrate Light Leakage Prevention
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional in cell touch display panels experience light leakage due to the integration of touch electrodes, which affects the display effect of liquid crystal display panels.
Innovation Solution
An array substrate design with first and second non-display areas alternately arranged between pixel units, where data lines are placed in the first non-display areas and gaps between electrode units are located above the second non-display areas, preventing the generation of lateral electric fields and thus avoiding light leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If touch electrodes are integrated into the liquid crystal display panel (in cell TP), then the volume of the touch screen is reduced, but light leakage occurs and display effect deteriorates
Solution Approach 1:
The common electrode is divided into multiple independent electrode units arranged in an array, with gaps between adjacent electrode units. This segmentation prevents the formation of continuous lateral electric fields that cause light leakage, while still maintaining the touch sensing function across the display panel.
Solution Approach 2:
Different regions are designed with different functions: first non-display areas contain data lines for driving pixel units, while second non-display areas contain gaps between electrode units to prevent light leakage. This local differentiation allows each region to optimize its specific function without compromising the other.
2Ease of manufacture
If data lines are placed in non-display areas between pixel units, then manufacturing is simplified, but lateral electric fields may be generated causing light leakage
Solution Approach 1:
Non-display areas are segmented into first non-display areas (containing data lines) and second non-display areas (with gaps between electrode units). This segmentation allows data lines to be placed in non-display areas without causing light leakage, as the gaps in second non-display areas interrupt the lateral electric field paths.
3Object-affected harmful factors
If gaps are provided between adjacent electrode units, then light leakage is prevented, but touch sensing accuracy may be affected
Solution Approach 1:
The electrode array is segmented with gaps between units, but the gaps are strategically positioned in second non-display areas away from pixel units. This segmentation prevents light leakage while maintaining sufficient electrode coverage for accurate touch sensing.
Solution Approach 2:
The electrode units extend sufficiently in the first direction to provide adequate overlap and capacitive coupling for touch sensing, even with gaps present. The partial coverage is sufficient to maintain sensing accuracy while preventing light leakage.
Data Source
AI summary
An array substrate, a method for fabricating the same and a display apparatus are provided. The array substrate includes first non-display areas and second non-display areas, where the first non-display areas and the second non-display areas are respectively areas between adjacent columns of the pixel units and are arranged alternately in the first direction; two data lines are disposed in each first non-display area, the two data lines are electrically connected to two columns of pixel units on two sides of the first non-display area where the two data lines are located; a gap is provided between two electrode units adjacent in the first direction, and the gap is located above a part of the second non-display area.