Display Substrate Layout for Blue-Balanced RGB Drive Ratios
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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.
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 overall brightness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If uniform channel width-length ratios are used for all driving transistors, then manufacturing simplicity is maintained, but blue light emission becomes insufficient and maximum brightness is restricted
Solution Approach 1:
The patent applies local quality by assigning different channel width-length ratios to driving transistors based on their specific color sub-pixel requirements. Blue sub-pixels receive transistors with larger ratios (5/25) to provide higher current drive capability for insufficient blue emission, while red and green sub-pixels use standard ratios (3/30). This localized differentiation resolves the contradiction between manufacturing simplicity and blue light emission adequacy.
2Illumination intensity
If channel width-length ratio of blue sub-pixel transistor is increased, then blue light emission is improved, but device complexity increases due to non-uniform transistor design
Solution Approach 1:
The patent implements parameter changes by systematically varying the channel width-length ratio parameter of driving transistors according to color-specific requirements. Blue sub-pixel transistors use a 5/25 ratio while red and green use 3/30, creating a controlled parameter differentiation that improves blue light emission while maintaining manageable device complexity through standardized ratio values.
3Stability of the object's composition
If different channel width-length ratios are used for different color sub-pixels, then white balance is achieved, but manufacturing precision requirements increase
Solution Approach 1:
The patent applies local quality by tailoring transistor characteristics to specific color sub-pixel requirements within the display panel. Each color sub-pixel type (red, green, blue) is assigned driving transistors with optimized channel width-length ratios matched to their individual luminance characteristics, enabling precise white balance control while maintaining clear manufacturing specifications for each transistor 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 emission, allowing the display device to achieve higher brightness levels while maintaining white balance, effectively addressing the limitations of uniform transistor ratios.
Implementation Method 1
Organic light emitting diodes have advantages of self-luminescence, high efficiency, bright color
Implementation Method 2
each sub-pixel includes an organic light emitting element
Data Source
AI summary
A display substrate is provided. The display substrate includes: a first color sub-pixel and a second color sub-pixel. 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.