Touch Display Device Layer Inversion for Transmittance
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Touch display devices, particularly those with organic light emitting diodes, face reduced transmittance and potential image distortion due to the placement of touch elements on top of the emitting diodes, which decreases brightness and can cause moire effects.
Innovation Solution
A touch display device design where the touch panel layer is positioned under the organic light emitting diode and includes a driving layer with thin film transistors, and the touch electrodes are arranged such that the number of sub-touch electrodes in one direction is equal to or less than in a perpendicular direction, enhancing bending properties and transmittance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the touch element is disposed on the organic light emitting diode, then the touch sensitivity is improved, but the transmittance and brightness are decreased
Solution Approach 1:
The patent inverts the conventional layer structure by placing the touch panel layer beneath the organic light emitting diode instead of above it. This inversion allows light to pass through the OLED before reaching the touch elements, significantly improving transmittance and brightness while preserving touch sensitivity through the transparent touch electrode material.
2Measurement precision
If the touch element is disposed on the organic light emitting diode, then the touch sensitivity is improved, but moire distortion occurs
Solution Approach 1:
By inverting the layer structure and positioning touch elements below the OLED, the patent eliminates the moire distortion problem that occurs when transparent touch elements are placed above the display. The light path is no longer interrupted by touch electrode patterns, preventing the interference patterns that cause moire effects.
3Area of stationary object
If the number of sub-touch electrodes in bending direction is increased, then the touch coverage is improved, but the bending property is degraded
Solution Approach 1:
The patent employs an asymmetric arrangement of sub-touch electrodes where the number of electrodes in the bending direction is deliberately limited to fewer than or equal to the number in the perpendicular direction. This asymmetric configuration reduces resistance to bending while maintaining adequate touch coverage through the transparent electrode material's conductive properties.
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 improves transmittance and bending properties of the touch display device, maintaining brightness while reducing image distortion and enhancing touch sensitivity and durability.
Implementation Method 1
an organic light emitting diode that emits light
Implementation Method 2
sensing a change in a voltage applied to the plurality of touch electrodes to sense a change in capacitance of the plurality of touch electrodes
Data Source
AI summary
Provided is a touch display device in which the transmittance can be improved. The touch display device includes a touch display panel and a touch driver connected to the touch display panel. The touch display panel includes a touch panel layer including a plurality of touch electrodes and a plurality of touch lines and a driving layer disposed on the touch panel layer and including a plurality of thin film transistors. Thus, the transmittance of the touch display device can be improved.