Display Device Conductive Body Reduces Electric Field
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Solution Overview
Problem
Code division multiplex drive in touch detection devices can increase the potential difference between drive electrodes, leading to a stronger electric field that deteriorates the displayed image by altering the orientation of liquid crystal molecules.
Innovation Solution
Incorporating a conductive body with an intermediate potential between the first electrodes, which reduces the electric field gradient and minimizes the impact on the liquid crystal molecules, while maintaining high detection sensitivity through the use of third electrodes that serve as both conductive bodies and detection electrodes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If code division multiplex drive is used to increase potential difference between drive electrodes for improving touch detection sensitivity, then touch detection sensitivity is improved, but the electric field strength increases causing liquid crystal molecule orientation change and image deterioration
Solution Approach 1:
A conductive body is introduced as an intermediary element positioned between the first electrodes. This conductive body has a potential intermediate between the potentials of the first electrodes, thereby reducing the electric field strength in the region between the first electrodes. This intermediate structure allows the system to maintain touch detection functionality while preventing the harmful effect of strong electric fields on liquid crystal molecules
Solution Approach 2:
The conductive body is configured to create an equipotential region between the first electrodes by maintaining an intermediate potential. This equipotential structure reduces the potential gradient and consequently the electric field strength in the critical region, preventing liquid crystal molecule reorientation while still allowing sufficient electric field for touch detection to function
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 enhances touch detection accuracy and prevents image deterioration by reducing the electric field strength between the first electrodes, thereby improving the quality of both touch detection and display performance.
Implementation Method 1
If the potential difference between the drive electrodes increases in touch detection, the intensity of an electric field generated between the drive electrodes increases. The electric field generated between the drive electrodes may possibly change the orientation of liquid crystal molecules included in a liquid crystal layer
Data Source
AI summary
A display device includes a first substrate, a second substrate, a display functional layer, first electrodes, pixel electrodes, second electrodes, a drive circuit, and a conductive body. The second substrate faces the first substrate. The display functional layer is provided between the first substrate and the second substrate. The first electrodes are provided between the first substrate and the second substrate. The pixel electrodes face the first electrodes between the first substrate and the second substrate. The second electrodes overlap the first electrodes through the display functional layer. The drive circuit supplies drive signals to a pair of the first electrode, wherein the drive circuit supplies a first electric potential to one of the pair of first electrodes and supplies a drive signal having a second electric potential different from the first electric potential to the other of the pair of first electrodes simultaneously.