OLED Array Substrate Layout for Blue-Balanced White Emission
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Solution Overview
Problem
Current vehicle display devices face challenges in achieving high brightness due to differences in brightness ratios of red, green, and blue light, leading to insufficient blue light emission when channel width-length ratios of driving transistors are uniformly designed, restricting maximum brightness and white balance accuracy.
Innovation Solution
The array substrate is designed with varying channel width-length ratios for driving transistors of different color sub-pixels, optimizing the ratios to ensure balanced white light emission by setting the ratio of channel width-length ratios of red, green, and blue sub-pixels to 1:(0.7-1.3):(1.5-2.5) or 1:1:2, thereby enhancing blue light emission and maintaining white balance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If channel width-length ratios of driving transistors are uniformly designed for all color sub-pixels, then manufacturing process is simplified, but blue light emission becomes insufficient and white balance accuracy deteriorates
Solution Approach 1:
The patent applies local quality by assigning different channel width-length ratios to driving transistors of different color sub-pixels. Specifically, blue sub-pixels are given larger ratios (1.5-2.5 times) compared to red and green sub-pixels to compensate for their inherently lower current efficiency and achieve balanced white light emission while maintaining manufacturability
2Illumination intensity
If channel width-length ratios are increased for blue sub-pixels to improve blue light emission, then brightness is enhanced, but device complexity increases
Solution Approach 1:
The patent changes the critical parameter of channel width-length ratio to resolve the contradiction. By adjusting this parameter differently for blue sub-pixels (increasing to 1.5-2.5 times) compared to red and green sub-pixels, the patent achieves sufficient blue light emission and overall brightness enhancement while managing device complexity through a systematic parameter optimization approach
3Measurement precision
If different channel width-length ratios are used for different color sub-pixels, then white balance accuracy is improved, but manufacturing precision requirements increase
Solution Approach 1:
The patent implements local quality by applying different channel width-length ratio specifications to different color sub-pixels. Blue sub-pixels receive larger ratios (1.5-2.5 times) to compensate for lower current efficiency, while red and green sub-pixels use standard ratios. This localized differentiation improves white balance accuracy while establishing clear manufacturing guidelines for each sub-pixel type
Data Source
AI summary
An array substrate and a manufacturing method therefor, and an organic light emitting diode display device are provided. The array substrate includes: a base substrate and a first color sub-pixel and a second color sub-pixel on the base substrate. The first color sub-pixel includes a first driving transistor, the second color sub-pixel includes a second driving transistor, and a channel width-length ratio of the first driving transistor is greater than a channel width-length ratio of the second driving transistor.