LCD Panel Touch Sensing Using Gate Lines
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Solution Overview
Problem
The integration of a touch panel on LCD apparatuses increases thickness and size, leading to decreased aperture ratio and light transmittance due to the formation of multiple sensing lines, which complicates the reduction of wiring necessary for efficient touch screen functionality.
Innovation Solution
The design incorporates a liquid crystal display panel with a reduced number of sensing lines by forming them parallel to data lines, utilizing a touch sensing circuit connected to adjacent gate lines, and including a common electrode with a voltage potential equal to connection members, allowing for efficient touch position detection with overlapping gate signals, thereby reducing the need for additional wiring.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a touch panel is integrally formed on the LCD apparatus, then touch screen functionality is achieved, but the aperture ratio and light transmittance are decreased due to multiple sensing lines
Solution Approach 1:
The gate lines are designed to serve dual functions: controlling pixel electrodes for display purposes and acting as sensing lines for touch detection. This eliminates the need for separate sensing lines, thereby maintaining high light transmittance while achieving touch screen functionality. The gate lines transmit both gate signals for pixel control and sensing signals for touch detection, making the display device multi-functional without additional wiring.
2Adaptability or versatility
If multiple sensing lines are formed for touch detection, then touch position detection is enabled, but the number of wirings increases and manufacturing complexity increases
Solution Approach 1:
The gate lines perform dual roles as both control lines for pixel electrodes and sensing lines for touch detection. By utilizing the existing gate line infrastructure for both display control and touch sensing, the patent eliminates the need for separate sensing line wiring, thereby reducing overall wiring complexity while enabling touch position detection functionality.
Solution Approach 2:
The patent merges the sensing line function with the gate line structure. Instead of creating separate sensing lines, the gate lines are used for both their original purpose of controlling pixel electrodes and the new purpose of detecting touch positions. This consolidation reduces the total number of wirings and simplifies the overall device structure.
3Adaptability or versatility
If the number of gate lines is increased to enable touch sensing, then touch detection capability is improved, but the wiring density increases
Solution Approach 1:
The gate lines are designed to serve dual functions: controlling pixel electrodes for display purposes and acting as sensing lines for touch detection. This eliminates the need for separate sensing lines, thereby maintaining high light transmittance while achieving touch screen functionality. The gate lines transmit both gate signals for pixel control and sensing signals for touch detection, making the display device multi-functional without additional wiring.
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 reduces the number of essential wirings required for touch position detection, enhancing display quality, increasing light transmittance, and decreasing manufacturing costs by eliminating the need for additional wiring processes.
Implementation Method 1
an arrangement of the liquid crystal layer is altered to control optical transmittance through the liquid crystal layer such that an image is displayed
Implementation Method 2
When electric fields are applied to the liquid crystal layer, an arrangement of the liquid crystal layer is altered
Data Source
AI summary
A liquid crystal display (LCD) panel includes an array substrate, an opposite substrate and a liquid crystal layer. The array substrate includes a plurality of data lines, a plurality of gate lines, a pixel electrode, a plurality of sensing lines and a touch sensing circuit. The gate lines cross the data lines. The number of the gate lines is double the number of data lines. The pixel electrode is connected to the data line and the gate line to define a pixel area. The sensing lines are formed substantially parallel to the data lines. The touch sensing circuit is electrically connected to adjacent gate lines in a forming direction of the data line and the sensing line, a sensing line for touch position detection being formed in one line direction. such that an aperture ratio of an LCD panel is increased.