Touch Detection Wire Placement and Equipotential Control
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Solution Overview
Problem
Existing display apparatuses with touch detection capabilities face issues with parasitic capacitance in self-capacitive detection operations, which affects the accuracy and speed of touch and force detection.
Innovation Solution
The display apparatus includes a configuration with gate lines, first and second switches, and a detection drive signal wire arranged between the switches and the display region, which prevents the generation of parasitic capacitance by maintaining the gate lines and first wires at the same potential during detection operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If gate lines are directly connected to detection electrodes in self-capacitive detection operation, then detection function is enabled, but parasitic capacitance is generated reducing detection accuracy
Solution Approach 1:
The patent applies equipotentiality by maintaining the first wire at the same potential as the gate lines during detection operations. This is achieved by connecting the first wire to the same power supply node as the gate lines, ensuring no potential difference exists between them. Consequently, no parasitic capacitance is generated between the gate lines and the first wire, resolving the technical contradiction between enabling detection function and eliminating parasitic capacitance.
2Productivity
If detection drive signal is supplied through switches arranged in frame region, then detection operation is enabled, but parasitic capacitance is generated affecting detection speed
Solution Approach 1:
The patent positions the first wire between the second switches and the display region, and maintains it at the same potential as the gate lines. This equipotential configuration ensures that during detection operations, no parasitic capacitance is generated between the detection drive signal path and the gate lines, thereby preserving fast detection speed without the harmful effects of parasitic capacitance.
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 the accuracy and speed of touch and force detection by eliminating parasitic capacitance, thereby improving the overall performance of the display apparatus in self-capacitive detection operations.
Implementation Method 1
In some cases, a large parasitic capacitance is generated in a self-capacitive detection operation. The first wire is arranged between the second switches and the display region... prevents the generation of parasitic capacitance by maintaining the gate lines and first wires at the same potential
Data Source
AI summary
According to an aspect, a display apparatus includes: a plurality of gate lines; a plurality of first switches arranged in respective pixels in a display region; a plurality of second switches arranged in a frame region surrounding the display region; a first wire coupled to the respective second switches and supplying a detection drive signal to the respective gate lines through the respective second switches in a detection operation period; a third switch arranged in the frame region and coupled to the first wire; and a second wire coupled to the third switch and supplied with an off-state voltage, wherein the first wire is arranged between the second switches and the display region and the off-state voltage of the first switches is supplied to the first wire in a display operation period different from the detection operation period.