Touch Panel Display Insulating Layer Segmentation
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Solution Overview
Problem
In touch-panel-equipped display devices, parasitic capacitances between signal lines and electrodes degrade touch detection accuracy, and increasing the thickness of insulating layers to reduce these capacitances decreases the capacitance between pixel electrodes, thereby degrading display quality.
Innovation Solution
The implementation of a touch-panel-equipped display device with a specific configuration of insulating layers, where a second insulating layer is placed between pixel electrodes and counter electrodes, and a first insulating layer is placed on touch detection lines, reducing parasitic capacitance without affecting the capacitance between pixel electrodes and counter electrodes, thereby improving touch sensing accuracy without compromising display quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the thickness of the insulating layer between signal lines and electrodes is increased to reduce parasitic capacitances, then touch detection accuracy is improved, but the capacitance between pixel electrodes and counter electrodes decreases, degrading display quality
Solution Approach 1:
The patent divides the insulating layer structure into two separate layers: a first insulating layer between the signal line and the electrode, and a second insulating layer between the pixel electrode and the counter electrode. This segmentation allows each layer to be optimized independently - the first insulating layer can be made thicker to reduce parasitic capacitance and improve touch detection accuracy, while the second insulating layer maintains appropriate thickness to preserve display quality and capacitance.
Solution Approach 2:
The patent applies different insulating layer configurations to different functional regions. The first insulating layer with greater thickness is specifically applied where signal lines overlap with electrodes to reduce parasitic capacitance in the touch detection path. The second insulating layer is applied in the display region to maintain proper capacitance for display quality. This local differentiation of insulating layer properties resolves the contradiction between touch accuracy and display quality.
2Device complexity
If a single insulating layer is used between signal lines and electrodes, then device complexity is reduced, but parasitic capacitances increase, degrading touch detection accuracy
Solution Approach 1:
The patent segments the insulating layer into two distinct functional layers with different thicknesses and positions. The first insulating layer is positioned between the signal line and electrode to minimize parasitic capacitance, while the second insulating layer is positioned between the pixel electrode and counter electrode to maintain display performance. This segmentation enables optimized touch detection accuracy without excessive overall device complexity.
Solution Approach 2:
The first insulating layer acts as an intermediary between the signal line and the electrode, specifically designed to reduce parasitic capacitance in the touch detection path. By introducing this intermediate layer with appropriate dielectric properties and thickness, the patent achieves better touch detection accuracy while the second insulating layer serves as another intermediary to maintain display quality, balancing the system overall.
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 enhances touch sensing accuracy while maintaining display quality by minimizing parasitic capacitance between touch detection lines and counter electrodes, ensuring precise touch position detection without luminance differences or image quality degradation.
Implementation Method 1
Parasitic capacitances are generated between the signal lines and a part of the other electrodes, thereby deteriorating touch detection accuracy
Implementation Method 2
a plurality of counter electrodes that form capacitors between the same and the pixel electrodes
Data Source
AI summary
Provided is a touch-panel-equipped display device that can improve the touch sensing accuracy, without decreases in the display quality, and a method for producing the same. A touch-panel-equipped display device includes an active matrix substrate 1. The active matrix substrate 1 includes a plurality of pixel electrodes 31; a plurality of counter electrodes 21 forming capacitors between the same and the pixel electrodes 31; a plurality of touch detection lines 22; a first insulating layer 461; and a second insulating layer 462. The touch detection lines 22 are connected with any of the counter electrodes 21, and supply a driving signal for touch detection to the counter electrodes 21 connected therewith. Between each pixel electrode 31 and the corresponding one of the counter electrodes 21, the second insulating layer 462 is arranged. Further, on each touch detection line 22, the first insulating layer 461 is arranged, the second insulating layer 462 is arranged on the first insulating layer 461, and each counter electrode 21 is arranged on the second insulating layer 462.