OLED Display Substrate Layout for Blue Brightness and White Balance
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Solution Overview
Problem
Current display technologies face challenges in achieving optimal brightness and white balance, particularly with blue light emission, due to differences in current efficiency among sub-pixels, leading to insufficient brightness and deviations in white balance color coordinates.
Innovation Solution
The display substrate design includes a base substrate with first, second, and third color sub-pixels, where the channel width-length ratios of driving transistors are optimized to ensure that the blue sub-pixel has a larger ratio than red and green sub-pixels, with specific positional relationships between connection holes, light emitting control signal lines, and electrodes to enhance pixel arrangement and wiring efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the channel width-length ratios of driving transistors are optimized with blue sub-pixels having a larger ratio than red and green sub-pixels, then the brightness of blue light is improved, but the device complexity increases due to different transistor configurations for different color sub-pixels
Solution Approach 1:
The patent applies local quality by configuring driving transistors with different channel width-length ratios according to the specific brightness requirements of different color sub-pixels. Blue sub-pixels are assigned transistors with larger channel width-length ratios to compensate for their inherently lower brightness, while red and green sub-pixels use transistors with smaller ratios. This localized optimization ensures each color achieves its target brightness without requiring a complete redesign of the entire display system.
2Ease of manufacture
If connection holes are positioned on both sides of the light emitting control signal line, then the wiring efficiency and pixel arrangement are improved, but the manufacturing precision requirements increase
Solution Approach 1:
The patent employs asymmetry in the positioning of connection holes relative to the light emitting control signal line. Instead of symmetric placement, the connection holes are positioned at specific asymmetric locations on either side of the signal line. This asymmetric arrangement optimizes the wiring path and reduces interference between signal lines while maintaining manufacturability through standardized fabrication processes.
3Stability of the object's composition
If the second electrode of third color sub-pixels does not overlap with the channel of driving transistors, then the white balance is maintained, but the area available for electrode placement is reduced
Solution Approach 1:
The patent resolves the spatial conflict between the second electrode and driving transistor channel by utilizing the vertical dimension (third direction perpendicular to the base substrate). Instead of attempting to place the electrode in the same planar space, the structure is arranged so that the electrode extends in the vertical direction without overlapping the horizontal channel region, thereby maintaining white balance while preserving adequate electrode placement area.
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
This approach improves the brightness of the display device by optimizing channel width-length ratios and positional relationships, preventing insufficient blue light brightness and maintaining white balance, thereby ensuring accurate white light emission at high gray scales.
Implementation Method 1
At least one sub-pixel comprises an organic light emitting element
Implementation Method 2
the organic light emitting element comprises a first electrode, a second electrode and a light emitting layer disposed between the first electrode and the second electrode
Data Source
AI summary
A display substrate and a display device are provided. The display substrate includes sub-pixels and a light emitting control signal line. The sub-pixel includes an organic light emitting element and a pixel circuit, the organic light emitting element includes a second electrode, the pixel circuit includes a driving transistor and a first light emitting control transistor, and the pixel circuit further includes a connection structure. In the second color sub-pixel, a first electrode of the first light emitting control transistor is electrically connected with the connection structure through a first connection hole, and the connection structure is electrically connected with the second electrode through a second connection hole, the first connection hole and the second connection hole are located on both sides of the light emitting control signal line. In the third color sub-pixel, the second electrode does not overlap with a channel of the driving transistor.