Touch Display Device Rear Surface Sensor Integration
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Solution Overview
Problem
Touch display devices face challenges in minimizing the non-pixel area of the screen due to sensor arrangement, leading to a widened bezel and reduced application yield.
Innovation Solution
A touch display device structure incorporating a display panel with light-emitting diodes, a touch sensor, and a light-receiving sensor, where the light-emitting element is disposed on the cathode electrode and the light-receiving sensor is on the rear surface, optimizing sensor placement to reduce bezel width and enhance application versatility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If sensors are arranged on the display panel, then touch sensing function is achieved, but non-pixel area increases and bezel widens
Solution Approach 1:
The patent combines the light-receiving sensor with the display panel structure by disposing the sensor on the rear surface of the substrate. This merging approach allows the sensor to share the same structural space as the display panel, eliminating the need for separate sensor modules that would increase the non-pixel area and bezel width.
Solution Approach 2:
The patent transitions the sensor arrangement from a planar configuration (on the front surface) to a three-dimensional configuration (on the rear surface). By moving the light-receiving sensor to the rear surface of the substrate, the design utilizes the vertical dimension to accommodate sensing components without expanding the horizontal non-pixel area.
2Ease of operation
If sensors are arranged on the display panel, then touch sensing function is achieved, but application yield decreases
Solution Approach 1:
The patent integrates the light-receiving sensor directly into the display panel manufacturing process by disposing it on the rear surface of the substrate during panel fabrication. This combined approach allows both the display panel and sensor to be produced in the same manufacturing line, improving application yield by reducing the need for separate sensor assembly processes.
3Area of stationary object
If light-emitting element is disposed on cathode electrode, then narrow bezel is achieved, but manufacturing complexity increases
Solution Approach 1:
The patent places the light-emitting element on the cathode electrode layer, utilizing the vertical stacking of layers to achieve proximity sensing functionality. This three-dimensional arrangement allows the light-emitting element to be positioned close to the light-receiving sensor on the rear surface without requiring additional lateral space, thereby maintaining a narrow bezel while managing manufacturing complexity through layered integration.
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 enables a narrow bezel design and increased yield by efficiently integrating sensors within the display panel, improving user interaction and application performance.
Implementation Method 1
a light-emitting element disposed on the cathode electrode at a second area of the display panel
Implementation Method 2
a light-receiving sensor disposed on a rear surface of the display panel
Data Source
AI summary
A touch display device comprises a display panel including a plurality of light-emitting diodes respectively including an anode electrode and a cathode electrode; a touch sensor disposed at a first area of the display panel; a light-emitting element disposed on the cathode electrode at a second area of the display panel; and a light-receiving sensor disposed on a rear surface of the display panel.