Piezoelectric Touch LCD Panel Eliminating External Overlay
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Solution Overview
Problem
Conventional LCD panels with touch functionality are thicker and require additional power due to the need for an external touch panel, which also increases light loss and reduces display quality.
Innovation Solution
Integration of piezoelectric elements on the LCD panel substrates that generate electrical signals in response to pressure, eliminating the need for an external touch panel by using photo spacers to apply pressure to these elements, thereby improving touch detection resolution and reducing power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a transparent touch panel is overlaid on an LCD panel to enable touch functionality, then the LCD panel can serve as an input device, but the thickness of the electronic device increases
Solution Approach 1:
The patent merges the touch sensing function with the LCD panel structure by integrating piezoelectric elements directly into the panel layers. The touch detection function is combined with the display structure, eliminating the need for a separate external touch panel overlay.
Solution Approach 2:
The LCD panel structure is designed to perform multiple functions: display and touch sensing. The piezoelectric elements are integrated into the existing panel layers, allowing the same structure to serve both display and input device functions simultaneously.
2Adaptability or versatility
If an external touch panel is overlaid on an LCD panel, then touch functionality is achieved, but extra power is required for operation of the touch function
Solution Approach 1:
The touch sensing function is merged with the LCD panel's existing electrical structure. The piezoelectric elements utilize the same signal lines and control circuits as the display function, eliminating the need for separate power supply systems for touch operation.
Solution Approach 2:
The same electrical infrastructure supports both display and touch functions. The piezoelectric elements share power and signal circuits with the display system, allowing dual functionality without additional power consumption overhead.
3Adaptability or versatility
If an external touch panel is overlaid on an LCD panel, then touch functionality is achieved, but light loss increases and display quality reduces
Solution Approach 1:
The touch sensing function is integrated within the LCD panel's internal structure rather than being added as an external overlay. This eliminates additional interfaces and layers that would cause light loss, maintaining display quality while enabling touch functionality.
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
The solution results in a thinner, lighter LCD panel with improved display quality, reduced power consumption, and enhanced touch detection resolution without the need for an external touch panel, minimizing crosstalk and light loss.
Implementation Method 1
A plurality of piezoelectric elements 121 is formed on the passivation layer 132
Data Source
AI summary
A liquid crystal display (LCD) panel provides touch panel function. When the LCD panel is contacted, one or more internal piezoelectric elements respond to the pressure via one or more corresponding photo spacers and generate electrical signals.