In-cell Touch Panel Aperture Rate via Black Matrix Electrode Placement
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Solution Overview
Problem
In-cell touch panels have a low aperture rate due to the need for insulation between touch driving and sensitive electrodes, which occupies space and reduces pixel unit efficiency.
Innovation Solution
The introduction of a touch sensing structural layer with first and second touch sensing electrodes in the same layer, arranged crosswise, and insulated from each other, positioned between the upper and lower substrates, with their projections located in the black matrix region to avoid occupying pixel unit space, and the use of bridging connection lines and floating electrodes to prevent signal interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If touch driving electrodes and touch sensitive electrodes are added in parallel to gate scanning lines and data signal lines respectively, then touch control function is implemented, but aperture rate of sub-pixel units decreases
Solution Approach 1:
The patent combines the touch sensing function with the display structure by integrating touch sensing electrodes into the same layer as the gate scanning lines and data signal lines. The touch driving electrodes are merged with gate scanning lines and touch sensitive electrodes are merged with data signal lines, allowing both display and touch functions to share the same electrode structures, thereby avoiding additional space occupation and improving aperture rate.
Solution Approach 2:
The patent utilizes the black matrix region, which is traditionally a non-display area, to accommodate touch sensing structures. By placing touch sensing electrodes in the black matrix region rather than in the pixel aperture area, the invention effectively uses unused space in the vertical dimension of the display structure, thereby maintaining high aperture rate while enabling touch control.
2Reliability
If gate scanning lines and touch driving electrodes keep certain distance for insulation, then mutual insulation is ensured, but space is occupied and aperture rate decreases
Solution Approach 1:
The patent merges touch driving electrodes with gate scanning lines and touch sensitive electrodes with data signal lines, eliminating the need for separate insulation spaces between these structures. By making them coincident in position, the invention removes the additional spacing requirements that would otherwise reduce aperture rate.
Solution Approach 2:
The patent introduces a black matrix layer as an intermediary structure that provides electrical insulation between adjacent conductive elements. The black matrix serves as both a visual element and an insulating barrier, allowing gate scanning lines and touch driving electrodes to be positioned closer together while maintaining necessary electrical isolation.
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 increases the aperture rate of the in-cell touch panel by allowing for efficient touch control without compromising the display's pixel unit efficiency, while using materials like metal or transparent conductive oxides for the electrodes to maintain functionality.
Implementation Method 1
the touch sensing structural layer comprises first touch sensing electrodes and second touch sensing electrodes both provided in a same layer, insulated from each other and arranged crosswise, wherein in a touch control period, a touch control scanning signal is applied to the first touch sensing electrodes, and the second touch sensing electrodes couple with the touch control scanning signal and provide an output
Data Source
AI summary
The disclosure discloses an in-cell touch panel and a display device, wherein a touch sensing structural layer for implementing a touch control function is added between an upper substrate and a lower substrate, the touch sensing structural layer includes first touch sensing electrodes and second touch sensing electrodes both provided in a same layer, insulated from each other and arranged crosswise, wherein an orthographic projection on the lower substrate, of a graph of the added touch sensing structural layer is located in a region where a graph of the black matrix layer is located, capable of avoiding occupying an aperture rate of pixel units.