Display Device Shielding Patterns for Touch Noise Reduction
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Solution Overview
Problem
Display devices with embedded cameras or sensors face challenges in reducing touch noise and achieving full-screen displays due to space constraints, leading to restricted screen sizes and design limitations.
Innovation Solution
A display device design that includes a substrate with a first optical area and a normal area, featuring a planarization layer, light emitting diodes, a bank, encapsulation unit, touch sensing unit, and shielding patterns to improve light transmittance and reduce touch noise, allowing camera or sensor placement without disrupting touch performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a camera or sensor is embedded on the front surface of the display device, then the multi-media function is improved, but the screen design is restricted and the screen size is reduced
Solution Approach 1:
The camera and sensor are disposed within the display area by nesting them under specific regions (first optical area and second optical area) of the display, allowing the camera and sensor to be integrated without occupying additional front surface space that would reduce the screen size
Solution Approach 2:
The patent utilizes the vertical dimension by disposing the camera and sensor beneath the display surface in specific areas, transforming the problem from a 2D surface allocation issue to a 3D spatial integration solution, enabling full-screen display while maintaining camera and sensor functionality
2Adaptability or versatility
If low-resolution pixels are disposed in the screen to provide an area for camera and sensor, then the camera placement is enabled, but the touch noise increases and touch performance deteriorates
Solution Approach 1:
The display area is divided into different regions with different resolutions: the first optical area and second optical area use low-resolution pixels to accommodate camera and sensor, while the third optical area uses normal-resolution pixels to maintain good touch performance, achieving local optimization of both camera integration and touch sensitivity
Solution Approach 2:
The display area is segmented into multiple optical areas with different characteristics: first optical area for camera, second optical area for sensor, and third optical area for normal display and touch interaction, allowing each segment to be optimized for its specific function while maintaining overall system performance
3Device complexity
If opaque components such as electrodes are disposed in the area with camera or sensor, then the touch electrode structure is simplified, but the light transmittance is reduced and luminosity deteriorates
Solution Approach 1:
The touch electrode structure is optimized locally in different areas: in the first and second optical areas where camera and sensor are disposed, transparent conductive materials or optimized electrode patterns are used to maintain high light transmittance, while in the third optical area, normal opaque electrodes can be used, achieving both structural simplicity and high luminosity
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 enhances luminosity and visibility by optimizing light transmittance in areas with camera or sensor placement, reducing touch noise and enabling full-screen displays without design constraints.
Implementation Method 1
a plurality of shielding patterns which is disposed between the encapsulation unit and the plurality of touch electrodes in the first optical area
Implementation Method 2
a plurality of light emitting diodes which is disposed on the planarization layer and includes an anode, an emission layer, and a cathode
Implementation Method 3
The first optical area includes a transmission area in which the cathode exposes the bank
Data Source
AI summary
A display device includes a substrate which includes a display area including a first optical area and a normal area and a non-display area, a planarization layer disposed on the substrate, a plurality of light emitting diodes disposed on the planarization layer and includes an anode, an emission layer, and a cathode, a bank disposed to cover an end of the anode on the planarization layer, an encapsulation unit disposed to cover the plurality of light emitting diodes and the bank, a touch sensing unit disposed on the encapsulation unit and includes a plurality of touch electrodes, and a plurality of shielding patterns disposed between the encapsulation unit and the plurality of touch electrodes in the first optical area. The first optical area includes a transmission area in which the cathode exposes the bank.