Integrated Touch Display with Position Detection Lines
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Solution Overview
Problem
Conventional touch panel display devices are bulky due to the placement of touch panels on top of the display and require complex structures for position detection drivers, which complicates the manufacturing process.
Innovation Solution
A liquid crystal display device with a thin film transistor substrate and a color filter substrate, featuring gate lines, data lines, position detection lines, and a protrusion pattern with a transparent conductive layer, allowing for integrated touch functionality and simplified structure by detecting position coordinates through changes in position detection voltage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a touch panel is disposed on top of a display device, then touch functionality is achieved, but the device becomes thick and large
Solution Approach 1:
The patent merges the touch panel functionality with the display device by integrating position detection lines and transistors directly into the display substrate layers. The touch detection electrodes are formed within the same substrate structure as the display, eliminating the need for a separate touch panel layer on top of the display, thus achieving touch functionality while maintaining a slim device profile.
Solution Approach 2:
The patent transitions from a three-layer structure (display substrate, touch panel, protective layer) to a two-dimensional integration approach where touch detection elements are embedded within the display substrate planes. Position detection lines are arranged in orthogonal directions within the same substrate plane, enabling touch detection without adding vertical thickness.
2Measurement precision
If position detection drivers are provided for x-axis and y-axis, then position detection is achieved, but the structure becomes complicated
Solution Approach 1:
The patent implements multi-functionality by using the same gate line structure for both display scanning and position detection purposes. The gate lines serve dual roles: driving the display pixels and detecting touch positions along one axis, while position detection lines detect positions along the orthogonal axis. This eliminates the need for separate position detection driver circuits, simplifying the overall structure while maintaining accurate position detection capability.
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
Enables a slim and multi-touch capable display device with reduced structural complexity, achieving both touch functionality and a streamlined manufacturing process.
Implementation Method 1
a transparent conductive layer on the protrusion pattern, electrically connected to the drain electrode when touching
Data Source
AI summary
A display device includes a plurality of gate lines and a plurality of data lines crossing each other on a first substrate, to define a pixel; a first thin film transistor in a portion where the gate lines and the data lines cross each other; a plurality of position detection lines on the first substrate, the position detection lines spaced a constant distance from the data lines and crossing the gate lines; a second thin film transistor for detecting a position, in a portion on the first substrate where the gate lines and the position detection lines cross each other; a protrusion pattern protruding from a second substrate and corresponding to a drain electrode of the second thin film transistor; and a transparent conductive layer on the protrusion pattern, electrically connected to the drain electrode when touching.