Display Panel Shared-Gate Layout for Higher Aperture Ratio
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Solution Overview
Problem
Existing organic light-emitting display devices face challenges in achieving an improved aperture ratio due to the large number of wirings required for pixel driving, especially when each pixel is composed of sub-pixels emitting light of four colors, including red, green, blue, and white.
Innovation Solution
A display panel design where two gate lines sandwich two light-emitting areas emitting different colors and are connected, with a scan line disposed between these areas to drive only the sensor transistor, and a 2-scan structure is formed by swapping the conventional pixel driving voltage (EVDD) and reference voltage (Vref) lines, allowing for a 4-sub-pixel operation in a DRD scheme.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a large number of wirings are used to drive pixels in a 4-color sub-pixel configuration, then the pixel driving function is ensured, but the aperture ratio deteriorates
Solution Approach 1:
Two adjacent gate lines are connected to each other to form a shared gate line that simultaneously drives sensor transistors in both pixels. This merging of gate lines reduces the total number of gate lines required, thereby increasing the aperture ratio while maintaining proper sensor transistor driving functionality.
Solution Approach 2:
The shared gate line serves multiple functions: it drives sensor transistors in both adjacent pixels and maintains the 2-scan structure for proper pixel operation. This multi-functionality allows the display to achieve 4-sub-pixel operation in DRD scheme without requiring separate dedicated gate lines for each sensor transistor.
2Reliability
If conventional pixel driving voltage (EVDD) and reference voltage (Vref) lines are used, then the pixel circuit operation is maintained, but the aperture ratio and luminance are limited
Solution Approach 1:
The positions of EVDD and Vref lines are swapped compared to conventional designs. By inverting the arrangement of these voltage lines, the patent creates more space for light-emitting areas, thereby increasing the aperture ratio and luminance while maintaining proper pixel circuit operation through the 2-scan structure.
3Reliability
If separate scan lines are added to drive sensor transistors, then the sensor function is improved, but the device complexity increases
Solution Approach 1:
The patent merges the scanning function for sensor transistors into the existing gate line structure by connecting adjacent gate lines. This eliminates the need for separate dedicated scan lines for sensor transistors, reducing device complexity while maintaining sensor functionality.
Solution Approach 2:
The gate lines are designed to serve dual purposes: driving both pixel circuits and sensor transistors. This multi-functionality reduces the total number of scan lines required, simplifying the overall wiring structure while ensuring proper sensor operation.
Data Source
AI summary
Disclosed are a display panel having an improved aperture ratio of each pixel and a display device including the same. To this end, the display panel includes a first pixel; and a second pixel adjacent to the first pixel in a first direction, where two light-emitting areas respectively emitting light of different colors and adjacent to each other in a second direction intersecting the first direction are disposed between two gate lines of a plurality of gate lines, where the two gate lines are connected to each other, where each of scan lines is disposed between the two light-emitting areas respectively emitting light of different colors and adjacent to each other in the second direction and disposed between the two gate lines connected to each other, where the scan line is configured to drive only a sensor transistor of each of the first pixel and the second pixel.