Stereoscopic LCD Touch Panel with Rear Electrode Shielding
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Solution Overview
Problem
Stereoscopic liquid crystal display devices with touch panels face issues with parasitic capacitance and noise interference from neighboring display panels, affecting touch detection accuracy and increasing manufacturing costs due to complex lens layer formation and bonding processes.
Innovation Solution
A stereoscopic liquid crystal display device design featuring a liquid crystal panel with a rear electrode and an electrically-driven liquid crystal lens, where the second electrode is grounded or set to 0V, and touch electrodes are formed as transparent electrodes to minimize interference and enhance touch detection stability, allowing for 2D/3D display switching.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a touch panel is added to a liquid crystal display device, then touch detection function is provided, but parasitic capacitance and noise interference occur affecting touch detection accuracy
Solution Approach 1:
A rear electrode layer is introduced as an intermediary component between the liquid crystal panel and the touch panel. This rear electrode acts as a shield that blocks parasitic capacitance and noise from the liquid crystal panel from interfering with the touch detection electrodes, thereby maintaining touch detection accuracy while preserving the touch function.
Solution Approach 2:
The patent converts the harmful parasitic capacitance effect into a beneficial shielding effect by strategically placing the rear electrode. The same electromagnetic field that causes parasitic capacitance is redirected to shield the touch detection area, turning the harmful interference into a protective mechanism that improves touch detection stability.
2Adaptability or versatility
If a lenticular lens layer is added for stereoscopic display, then 3D display function is achieved, but manufacturing complexity and cost increase due to complex lens formation and bonding processes
Solution Approach 1:
The patent merges the lenticular lens layer with the touch panel into a single integrated structure. Instead of separately forming and bonding the lens layer to the display panel, the lens patterns are directly formed on the touch panel substrate, combining two manufacturing processes into one and significantly reducing manufacturing complexity.
Solution Approach 2:
The touch panel substrate is given multiple functions: it serves as both the touch detection substrate and the lenticular lens carrier. This multi-functional design eliminates the need for separate lens layers and reduces the number of bonding processes required, thereby simplifying the overall manufacturing process.
3Device complexity
If electrodes are used for both liquid crystal control and touch detection, then device structure is simplified, but parasitic capacitance interferes with touch detection stability
Solution Approach 1:
The electrode system is segmented into distinct functional layers: liquid crystal control electrodes on the display panel side and touch detection electrodes on the touch panel side, with the rear electrode as an additional segmentation layer. This physical and functional segmentation prevents parasitic capacitance coupling between control and detection signals, ensuring touch detection stability.
Solution Approach 2:
The rear electrode serves as an intermediary shielding layer that electrically isolates the liquid crystal control electrodes from the touch detection electrodes. This intermediary structure blocks parasitic capacitance pathways while maintaining the simplicity of having integrated electrode systems on both panels.
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 stabilizes touch detection by reducing noise interference and enhances touch recognition rates, while enabling seamless 2D/3D display switching, thus addressing parasitic capacitance and manufacturing complexity issues.
Implementation Method 1
the liquid crystal display device uses an electric field to adjust light transmissivity of the liquid crystals, thereby display an image
Implementation Method 2
a touch panel layer 50... an adhesion layer 45 between the interface... adhering (or bonding) the liquid crystal layer panel 1 to the touch panel layer 50
Implementation Method 3
the touch panel may recognize specific portions touched by the hand of the user or by a separate input means and may transmit separate information with respect to recognized portion of the screen
Data Source
AI summary
A stereoscopic liquid crystal display device having a touch panel and a method for manufacturing the same, wherein a stable touch detection can be performed without influencing the operation of a neighboring display panel or an electrically-driven liquid crystal lens, are disclosed.