LCD Touch Transistor Extraction for Thinner Displays
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Solution Overview
Problem
Conventional LCD touch panels with resistors or capacitors incorporated into the display panel increase thickness and reduce light transmittance, necessitating a solution to minimize weight and volume while maintaining touch input functionality.
Innovation Solution
A liquid crystal display apparatus with a touch input function that includes a first display unit, a touch transistor, a touch-sensing device, and a touch-detecting circuit, where the touch transistor has a gate electrode coupled to a scanning line and terminals connected to sensing lines, and the touch-sensing device electrically connects conductors upon touch, allowing for single and multi-touch input without increasing panel thickness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If resistors or capacitors are directly disposed on the LCD panel to enable touch input function, then touch input functionality is achieved, but light transmittance through the panel is decreased and overall thickness is increased
Solution Approach 1:
The patent extracts the touch sensing function from the display panel structure by using a separate touch sensor module that couples to the display panel via a touch bus. This separates the touch input functionality from the light transmission path, allowing the display panel to maintain its optical properties while the touch sensor provides input capability.
Solution Approach 2:
The patent introduces a touch bus as an intermediary connection between the touch sensor and the display panel. This intermediary allows electrical signals to be transmitted between the touch sensor and display controller without requiring direct integration of resistors or capacitors into the panel structure, thus preserving light transmittance.
2Ease of operation
If resistors or capacitors are directly disposed on the LCD panel to enable touch input function, then touch input functionality is achieved, but overall thickness of the panel is increased
Solution Approach 1:
The touch sensing elements (resistors or capacitors) are extracted from the panel structure and placed in a separate touch sensor module. This modular approach allows the display panel to maintain its original thin structure while the touch functionality is provided by an externally coupled sensor.
Solution Approach 2:
The patent segments the display system into separate functional modules: the display panel for visual output and the touch sensor for input detection. These modules are connected via a touch bus, allowing each component to be optimized independently for its specific function without compromising the other.
3Adaptability or versatility
If additional resistors or capacitors are incorporated into the LCD panel to provide touch input function, then touch input capability is added, but device weight and volume increase
Solution Approach 1:
The touch input components are extracted from the display panel and consolidated into a separate touch sensor module. This extraction reduces the weight and volume of the overall device by eliminating the need for additional resistors and capacitors to be distributed throughout the panel structure.
Solution Approach 2:
The patent merges the touch sensor with the display panel through a coupling mechanism that integrates both functions into a unified assembly. This merging approach allows the touch functionality to be added without proportionally increasing device weight, as the touch sensor shares the same housing and structural support as the display panel.
Data Source
AI summary
A liquid crystal display apparatus with touch input function includes a display unit coupling to a first scanning line, a touch transistor, a touch-sensing device, and a touch-detecting circuit coupling to a sensing line. The touch transistor includes a gate coupling to a second scanning line, a first terminal, and a second terminal coupling to the sensing line. The touch-sensing device includes a first conductor coupling to the first terminal of the touch transistor, a second conductor coupling to the first scanning line, and a touch conductor configured to electrically connect the first conductor and the second conductor when a sensing region of the liquid crystal display apparatus is touched.