Touch Sensor Bridge Layout for Higher-Visibility Display Pixels
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Solution Overview
Problem
Existing display devices face challenges in maintaining visibility and light emission efficiency due to interference from conductive structures in the sensing panel, which can disrupt the light path.
Innovation Solution
The display device incorporates a touch sensor design with specific arrangements of conductive pattern layers and pixel defining layers, including non-overlapping bridges and varying widths of pixel defining layers to minimize interference, enhancing visibility and light emission efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conductive pattern layers are arranged to form sensing electrodes, then touch sensing capability is improved, but light path interference increases and visibility deteriorates
Solution Approach 1:
The sensing electrode is divided into multiple discrete cells (first cells and second cells) connected by bridges. This segmentation allows the conductive structure to be distributed across multiple locations rather than forming continuous large-area patterns that would block light paths, thereby maintaining touch sensing capability while reducing light interference.
Solution Approach 2:
Different regions of the display device have different structural characteristics. The pixel defining layers have varying widths (first width for first/second sub-pixels, second width for third sub-pixel) to locally optimize the balance between touch sensing performance and light transmission in different areas of the display.
2Productivity
If pixel defining layers are added to define sub-pixel areas, then light emission efficiency is improved, but device complexity increases
Solution Approach 1:
The pixel defining layers serve multiple functions simultaneously: they define the boundaries of sub-pixel areas for light emission control, provide structural support for the conductive pattern layers, and contribute to touch sensing functionality. This multi-functionality improves light emission efficiency without proportionally increasing device complexity.
3Reliability
If bridges connect cells to form continuous sensing electrodes, then touch sensitivity is improved, but overlap with sub-pixels increases and visibility decreases
Solution Approach 1:
The bridges connecting the cells are configured to extend primarily in the second direction (perpendicular to the first direction), while the cells are arranged in the first direction. This dimensional arrangement allows the bridges to connect sensing elements effectively for maintaining touch sensitivity while minimizing their projection overlap with the sub-pixel areas, thereby preserving visibility.
Data Source
AI summary
A display device comprises a first pixel and a second pixel adjacent in a first direction, and a sensor a first conductive pattern layer and a second conductive pattern layer. The pixels include a first sub-pixel forming a first sub-pixel area emitting a first color, a second sub-pixel forming a second sub-pixel area emitting a second color, and a third sub-pixel forming a third sub-pixel area emitting a third color. The third sub-pixels of the first and second pixels are adjacent in the first direction. The first and second sub-pixels of the first pixel and the second pixel are adjacent in the first direction. The sensor comprises a first sensing electrode and a second sensing electrode, each comprising cells and bridges. A second bridge is not between the first and second sub-pixels of the first and second pixels, and extends between the third sub-pixels of the first and second pixels.