Array Substrate Driving Transistor Channel Width-to-Length Ratio
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Solution Overview
Problem
Existing large-sized organic light emitting display panels experience differences in brightness among sub-pixels of different colors due to variations in white light generated by the white electroluminescent device, leading to reduced display quality when the same data voltage is applied.
Innovation Solution
The array substrate design includes sub-pixel regions with pixel driving circuits featuring driving transistors with varying width-to-length ratios of channel regions, which are optimized to compensate for light emitting brightness differences by adjusting the dimensions of the channel regions in each color sub-pixel region, ensuring consistent light emission across colors under the same data voltage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the same data voltage is applied to all sub-pixel regions, then the manufacturing and control process is simple, but the light emitting brightness of sub-pixels of different colors becomes inconsistent
Solution Approach 1:
The patent applies local quality by setting different width-to-length ratios for channel regions of driving transistors in different color sub-pixel regions. Specifically, the first-color sub-pixel region has a greater width-to-length ratio than the second-color sub-pixel region, which in turn has a greater ratio than the third-color sub-pixel region. This local differentiation compensates for the inherent brightness differences of different color electroluminescent materials, achieving consistent display brightness across all colors while maintaining a unified control process.
2Illumination intensity
If the width-to-length ratio of channel regions is adjusted to compensate for brightness differences, then the light emitting brightness consistency is improved, but the device structure becomes more complex
Solution Approach 1:
The patent employs parameter changes by adjusting the width-to-length ratio of the channel regions of driving transistors in different color sub-pixel regions. By changing this geometric parameter, the patent compensates for the different light emitting efficiencies of red, green, and blue electroluminescent materials. This approach achieves brightness uniformity through parameter optimization rather than adding complex structural elements, thus minimizing device complexity while solving the brightness inconsistency problem.
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 design enhances the light emitting brightness consistency of sub-pixel regions of various colors, thereby improving the overall display quality by increasing driving currents and compensating for light losses across different wavelengths.
Implementation Method 1
a white electroluminescent device connected with the pixel driving circuit; wherein different sub-pixel regions correspond to different color resist layers with different colors
Data Source
AI summary
Disclosed are an array substrate, a display panel and a display device. The display panel includes a plurality of sub-pixel regions; each of the sub-pixel regions includes a pixel driving circuit, a white electroluminescent device connected with the pixel driving circuit and a color resist layer corresponding to the sub-pixel region; the plurality of sub-pixel regions include a first-color sub-pixel region, a second-color sub-pixel region and a third-color sub-pixel region; a width-to-length ratio of a channel region of the driving transistor in the first-color sub-pixel region is greater than a width-to-length ratio of a channel region of the driving transistor in the second-color sub-pixel region, and the width-to-length ratio of the channel region of the driving transistor in the second-color sub-pixel region is greater than a width-to-length ratio of a channel region of the driving transistor in the third-color sub-pixel region.