Touch Detection Driving Electrode Terminal Reduction
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Solution Overview
Problem
The increasing number of driving electrodes in liquid crystal displays with touch detection functions leads to a larger semiconductor device and increased wiring complexity, resulting in a larger display size and reduced flexibility in wiring layout.
Innovation Solution
A liquid crystal display with a pixel array, scanning lines, signal lines, touch detection driving electrodes, and a semiconductor device with fewer driving terminals, utilizing a selection circuit to supply driving signals to touch detection driving electrodes and detection signals to detection electrodes, and using common terminals for both driving and detection functions in a time-sharing manner.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the number of driving electrodes is increased to improve touch detection coverage, then the touch detection functionality is improved, but the number of external terminals and wirings increases, resulting in larger display size and reduced wiring layout flexibility
Solution Approach 1:
The patent applies multi-functionality by enabling common electrodes to serve dual purposes: as liquid crystal driving electrodes for display operation and as touch detection driving electrodes for touch sensing. This allows the same electrode structure to perform multiple functions, eliminating the need for separate dedicated touch electrodes and reducing the overall number of terminals and wirings required in the system.
Solution Approach 2:
The patent merges the liquid crystal driving electrode function and touch detection driving electrode function into a single common electrode structure. By combining these functions into one shared electrode system, the patent reduces device complexity while maintaining both display and touch detection capabilities, directly addressing the contradiction between functional coverage and structural complexity.
2Adaptability or versatility
If the number of external terminals on the semiconductor device is increased to supply driving signals to more driving electrodes, then the touch detection functionality is improved, but the semiconductor device size increases and wiring region expands
Solution Approach 1:
The semiconductor device is designed to output driving signals that serve dual purposes: driving the liquid crystal display and enabling touch detection. By making the driving signals multi-functional, the patent eliminates the need for separate dedicated touch detection terminals, thereby reducing the number of external terminals required on the semiconductor device and minimizing the device area and wiring region.
Solution Approach 2:
The patent combines the liquid crystal driving signal output and touch detection driving signal output into a single shared signal pathway. The same driving signals generated by the semiconductor device are used for both display operation and touch sensing, merging these functions at the signal level and reducing the need for additional terminals and wiring space.
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 allows for a more compact design by reducing the number of external terminals and wirings, enabling smaller display sizes and improved touch detection accuracy while maintaining touch detection functionality.
Implementation Method 1
A touch detection device of electrostatic capacity type detects approaching of an external object by utilizing, for example, the fact that values of capacities of intersection portions at which driving electrodes and detection electrodes intersect are changed when an external object such as a finger approaches
Data Source
AI summary
To provide a display capable of achieving downsizing and a touch detection method. The display includes a pixel array including a plurality of pixels disposed in a matrix form, a plurality of scanning lines disposed in each row of the pixel array and supplying scanning signals to the plurality of pixels disposed in corresponding rows, a plurality of signal lines disposed in each column of the pixel array and supplying image signals to the plurality of pixels disposed in corresponding columns, a plurality of common electrodes disposed in each of the columns of the pixel array and supplied with driving signals for detecting touch, and a semiconductor device for touch including a plurality of driving terminals for supplying the driving signals. Here, the plurality of driving terminals of the semiconductor device for touch are smaller in number than the plurality of common electrodes disposed in the pixel array.