Region-Specific Touch Panel Openings for Under-Display Optical Sensors
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Solution Overview
Problem
Display devices with optical sensors face challenges in expanding the display area while maintaining the functionality of optical sensors, particularly in areas where optical sensors overlap with the display panel, leading to reduced light incidence and interference with touch sensing.
Innovation Solution
A display device design that incorporates a touch sensing panel with distinct sensing areas, including conductive patterns in the first sensing area overlapping the optical sensor, which have lower density and thickness, allowing for enhanced light transmission and touch detection, while maintaining touch sensitivity in both sensing areas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the optical sensor is disposed to overlap the display panel to eliminate the hole on the front surface, then the display area is expanded, but the light incidence on the optical sensor is reduced
Solution Approach 1:
The touch sensing panel is designed with different opening area ratios in different regions: the first region (overlapping the optical sensor) has a larger opening area ratio to ensure sufficient light transmission, while the second region has a smaller opening area ratio to maintain touch sensing performance. This local differentiation resolves the contradiction by optimizing light incidence specifically where the optical sensor is located.
Solution Approach 2:
The touch sensing panel is divided into two distinct sensing areas: a first sensing area corresponding to the optical sensor location with larger opening areas, and a second sensing area with smaller opening areas. This segmentation allows each region to be optimized for its specific function - light transmission in the first area and touch detection in the second area.
2Area of stationary object
If the optical sensor is disposed to overlap the display panel, then the display area is expanded, but touch sensing is interfered with in the overlapping area
Solution Approach 1:
The touch sensing panel uses different opening area ratios in different regions to simultaneously satisfy optical sensor light transmission requirements and touch sensing requirements. The first region has larger openings for light transmission, while the second region has smaller openings optimized for touch detection, thus resolving the contradiction between display area expansion and touch sensing reliability.
Solution Approach 2:
The touch sensing panel is segmented into a first sensing area with larger opening areas for optical sensor compatibility and a second sensing area with smaller opening areas for optimized touch detection. This segmentation ensures that touch sensing reliability is maintained in both regions despite the different functional requirements.
3Measurement precision
If the conductive patterns are made denser to improve touch sensing, then touch sensitivity is improved, but light transmission to the optical sensor is reduced
Solution Approach 1:
The conductive patterns are designed with different opening area ratios in different regions. In the first region overlapping the optical sensor, the opening area ratio is larger (e.g., 40-70%) to ensure sufficient light transmission. In the second region, the opening area ratio is smaller (e.g., 10-30%) to provide adequate touch sensing sensitivity. This local differentiation resolves the contradiction between touch sensing sensitivity and light transmission.
Solution Approach 2:
The touch sensing panel is divided into a first sensing area with larger opening areas between conductive patterns for light transmission, and a second sensing area with smaller opening areas for touch sensing sensitivity. This segmentation allows each region to have optimized conductive pattern density according to its specific functional requirements.
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 design ensures reliable light incidence on the optical sensor and effective touch detection, enhancing the convenience and reliability of the display device by allowing touch input in areas overlapping the optical sensor.
Implementation Method 1
A surface area of each of the first opening areas is greater than a surface area of each of the second opening areas
Implementation Method 2
The touch sensing panel includes a first sensing area corresponding to an area in which the optical sensor is disposed, and a second sensing area distinct from the first sensing area
Data Source
AI summary
A display device includes an optical sensor, a display panel disposed on the optical sensor, and a touch sensing panel disposed on the display panel. The touch sensing panel includes a first sensing area corresponding to an area in which the optical sensor is disposed, and a second sensing area distinct from the first sensing area. The touch sensing panel further includes first conductive patterns extending in a first direction, and second conductive patterns extending in a second direction intersecting with the first direction. First opening areas are provided by the first conductive patterns and the second conductive patterns disposed in the first sensing area. Second opening areas are provided by the first conductive patterns and the second conductive patterns disposed in the second sensing area. A surface area of each of the first opening areas is greater than a surface area of each of the second opening areas.