Touch-Control LCD Common Electrode Structure
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Solution Overview
Problem
Existing touch-control liquid-crystal display screens require a separate touch sensing layer, which complicates the structure and reduces light transmittance, and can cause interactions between touch detection and display control functions.
Innovation Solution
A liquid-crystal display screen with a common electrode that includes a first and second sensing electrode, connected to a touch detection unit and a display control unit, operating in a timesharing manner, allowing the common electrode to function as both a touch detection and display electrode without a separate touch sensing layer, thereby simplifying the structure and improving light transmittance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a separate touch sensing layer is added to the display screen, then touch detection function is achieved, but the structure becomes complicated and light transmittance decreases
Solution Approach 1:
The patent merges the touch sensing electrode and display electrode into a single common electrode layer. The common electrode serves dual functions: it acts as a display electrode for liquid crystal control and as a touch sensing electrode for capacitive touch detection. This integration eliminates the need for a separate touch sensing layer, thereby simplifying the overall structure while maintaining both touch detection and display functions.
Solution Approach 2:
The common electrode is designed to perform multiple functions simultaneously. It functions as both a display electrode (controlling liquid crystal molecules along with the pixel electrode) and a touch sensing electrode (detecting touch events through capacitive coupling). This multi-functionality reduces the number of required layers and components in the display screen structure.
2Adaptability or versatility
If a separate touch sensing layer is added to the display screen, then touch detection function is achieved, but light transmittance is reduced
Solution Approach 1:
By combining the touch sensing and display functions into a single common electrode layer, the patent eliminates the need for additional transparent conductive layers that would otherwise be required for a separate touch sensing structure. This reduction in layering minimizes light absorption and scattering interfaces, thereby maintaining higher light transmittance while still achieving touch detection capability.
3Reliability
If separate control units are used for touch detection and display control, then functional independence is achieved, but device complexity increases
Solution Approach 1:
The patent combines the touch detection control unit and display control unit into a single integrated control unit. This unified controller manages both the display electrode signals and touch sensing electrode signals, coordinating their operations to achieve both display and touch detection functions. The integration reduces the number of separate control circuits and interfaces, simplifying the overall device architecture while maintaining functional independence through internal signal management.
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 simplifies the structure of the touch-control display screen, enhances light transmittance, and prevents interactions between touch detection and display control functions by using the common electrode for both purposes, allowing for efficient and effective touch detection and display control.
Implementation Method 1
the touch detection unit is adapted to detect a self-capacitance formed between the first sensing electrode and the second sensing electrode or a mutual-capacitance formed between the first sensing electrode and the second sensing electrode
Data Source
AI summary
The present invention discloses a liquid-crystal display screen with touch-control function and a manufacturing method thereof and an electronic apparatus. The liquid-crystal display screen includes a first sensing electrode and a second sensing electrode, which are included in a common electrode in display electrodes of the liquid-crystal display screen, and are connected to a touch detection unit. Furthermore, the touch detection unit and a display control unit operate in a timesharing manner. In this way, in the touch-control display screen, the common electrode may also be used as an electrode for detecting a touch on the touch-control display screen, and the structure of the display screen is simplified. Moreover, the touch-control display screen has a better light transmittance and the detecting for the touch and the control for the display may not interact with each other.