Touch Display Screen Electrode Multiplexing for Transmittance
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Solution Overview
Problem
Existing touch display screens require a separate touch-sensitive layer, which complicates their structure and reduces transmittance, as well as potentially interferes with touch detection and display control operations.
Innovation Solution
A touch display screen design where the display electrode includes electrodes in two directions connected to a touch detecting unit, allowing for mutual capacitance detection and eliminating the need for a separate touch-sensitive layer, with the touch detecting and display control units operating in a time-sharing manner to multiplex the display electrode for touch detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a separate touch-sensitive layer is provided to detect touch, then touch detection function is achieved, but the structure of the touch display screen becomes complex
Solution Approach 1:
The patent merges the touch detection function with the display electrode by enabling the display electrode to serve dual purposes: both displaying images and detecting touch input through mutual capacitance measurement. This integration eliminates the need for a separate touch-sensitive layer, thereby simplifying the overall structure while maintaining reliable touch detection functionality.
Solution Approach 2:
The display electrode is designed to perform multiple functions simultaneously - it acts as both the display electrode for liquid crystal control and the touch detection electrode for detecting finger touches through mutual capacitance changes. This multi-functionality reduces the number of separate components needed in the display screen structure.
2Reliability
If a separate touch-sensitive layer is provided, then touch detection is enabled, but transmittance of the touch display screen is reduced
Solution Approach 1:
By combining the touch detection function into the existing display electrode structure, the patent eliminates the need for an additional touch-sensitive layer that would otherwise block or absorb light. This integration maintains high transmittance while enabling reliable touch detection through the mutual capacitance sensing mechanism.
3Adaptability or versatility
If touch detecting unit and display control unit operate simultaneously, then both functions are available, but they may interfere with each other
Solution Approach 1:
The patent implements time-division multiplexing where the touch detecting unit and display control unit operate in alternating time slots rather than simultaneously. During dedicated touch detection periods, the display electrode is used for capacitance measurement, while during display periods, it is used for liquid crystal control. This periodic operation prevents interference between the two functions while maintaining both capabilities.
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 simplifies the screen structure, enhances transmittance by omitting the touch-sensitive layer, and ensures that touch detection and display control operations do not interfere with each other.
Implementation Method 1
the touch detecting unit is adapted to detect the mutual capacitance formed between the electrode in the first direction and the electrode in the second direction
Data Source
AI summary
A touch display screen, a method for manufacturing a display electrode of the touch display screen, a display electrode and an electronic device are described. In the touch display screen, the electrode in the first direction and the electrode in the second direction are connected to the touch detecting unit, and the touch detecting unit and the display control unit operate in a time-sharing manner. Thus, a part of the display electrode can be multiplexed, and it is unnecessary to provide an additional touch-sensitive layer to detect the touch on the touch display screen, so the structure of the touch display screen is simplified; because the touch-sensitive layer is omitted, the touch display screen has better transmittance; and because the touch detecting unit and the display control unit operate in a time-sharing manner, the detection on the touch and the control on the display will not affect mutually.