OLED Array Substrate Channel Ratios for Blue Sub-Pixel Brightness
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Solution Overview
Problem
Existing vehicle display devices face challenges in achieving high brightness, particularly with blue light, due to differing current efficiencies of red, green, and blue sub-pixels, leading to insufficient blue light emission when designing for high-brightness displays.
Innovation Solution
Optimizing the channel width-length ratios of driving transistors in sub-pixels of different colors on the array substrate by setting them differently, specifically making the blue sub-pixel's transistor ratio greater than the red and green sub-pixel's ratios, to ensure balanced white light emission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the channel width-length ratio of driving transistors is optimized differently for different colored sub-pixels, then the brightness balance and white light emission are improved, but the device complexity and manufacturing difficulty increase
Solution Approach 1:
The patent applies local quality by setting different channel width-length ratios for driving transistors in different colored sub-pixels (red, green, blue) according to their specific current efficiency characteristics. Each sub-pixel's driving transistor is customized with appropriate ratio parameters to compensate for color-specific emission differences, achieving balanced white light output while maintaining manufacturing feasibility through systematic parameter differentiation.
2Illumination intensity
If the channel width-length ratio of blue sub-pixel transistor is increased, then the blue light emission is improved, but the manufacturing precision requirements increase
Solution Approach 1:
The patent applies parameter changes by specifically adjusting the channel width-length ratio parameter of driving transistors in blue sub-pixels to higher values compared to red and green sub-pixels. This parameter optimization compensates for the lower current efficiency of blue light emitting materials, enhancing blue light brightness. The systematic parameter differentiation across color sub-pixels enables balanced display performance while establishing clear manufacturing specifications for each sub-pixel type.
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 prevents insufficient blue light brightness and maintains white balance, enhancing the overall brightness and accuracy of vehicle display devices.
Implementation Method 1
Organic light emitting diodes have advantages of self-luminescence, high efficiency, bright color, thin and light
Data Source
Figure 1A~1C
Figure 1D~2
Figure 3~4
AI summary
An array substrate and a manufacturing method therefor, an organic light emitting diode display device and a display substrate are provided. The array substrate includes: a base substrate (100) and a first color sub-pixel (110) and a second color sub-pixel (120) on the base substrate (100). The first color sub-pixel (110) includes a first driving transistor (111), the second color sub-pixel (120) includes a second driving transistor (121), and a channel width-length ratio of the first driving transistor (111) is greater than a channel width-length ratio of the second driving transistor (121). The embodiments of the present disclosure can improve the brightness of a display device including the array substrate by optimizing channel width-length ratios of driving transistors of sub-pixels with different colors on the array substrate.