Display Pixel Layout With Split B Subpixel for Low-Gray Color Stability
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Solution Overview
Problem
Existing organic electroluminescence display devices face challenges in achieving high resolution and compact size, with issues of blue luminous efficiency and color shift due to leakage currents, particularly in low gray level driving.
Innovation Solution
The display device incorporates a B sub-pixel with two sub-emission regions and a controller that selectively controls the emission of light emitting diodes based on gray level, using a trench to prevent lateral leakage currents and adjust luminance accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single light emitting diode is used in each subpixel, then the device structure is simple, but blue luminous efficiency is insufficient and color shift occurs due to leakage current
Solution Approach 1:
The B subpixel is divided into two separate light emitting diodes (first and second light emitting diodes) with distinct emission regions, allowing independent control of each segment. This segmentation enables selective activation of only the first light emitting diode at low gray levels, reducing leakage current impact and improving blue luminous efficiency without requiring complete structural redesign of all subpixels
2Loss of energy
If both light emitting diodes in the B subpixel are always activated, then blue luminous efficiency is improved, but color shift occurs due to leakage current at low gray levels
Solution Approach 1:
The system dynamically adjusts which light emitting diodes are activated based on the gray level requirements. At low gray levels, only the first light emitting diode is activated to minimize leakage current effects and prevent color shift. At high gray levels, both light emitting diodes are activated to maximize blue luminous efficiency. This dynamic control strategy optimizes both color stability and luminous efficiency across different operating conditions
3Measurement precision
If the display device is designed for high resolution, then image quality is improved, but achieving compact size becomes difficult
Solution Approach 1:
By segmenting the B subpixel into two independently controllable light emitting diodes, the patent enables more precise control over light emission in different gray level ranges. This segmentation allows for optimized pixel layout and reduced inter-pixel interference, contributing to higher resolution achievement within compact dimensions
4Illumination intensity
If the aperture ratio is increased to improve brightness, then luminance is enhanced, but resolution and compactness are compromised
Solution Approach 1:
The patent applies local quality by creating different emission characteristics in different regions of the B subpixel. The first and second light emitting diodes have distinct emission regions that can be selectively activated. This allows optimization of light emission density in specific local areas rather than uniformly increasing aperture ratio across the entire pixel, thereby enhancing luminance while preserving resolution and compactness
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 configuration enhances blue luminous efficiency, prevents color shift, and maintains image quality across varying gray levels by optimizing light emission in the B sub-pixel.
Implementation Method 1
each of the first subpixel and the third subpixel include a single light emitting diode corresponding to a single light emission region, and the second subpixel includes a first light emitting diode corresponding to a first sub-emission region, and a second light emitting diode corresponding to a second sub-emission region
Data Source
AI summary
A display device including a plurality of pixels disposed on a substrate, wherein each pixel includes a first subpixel, a second subpixel adjacent to the first subpixel, and a third subpixel adjacent to the second subpixel. Further, each of the first subpixel and the third subpixel include a single light emitting diode corresponding to a single light emission region, and the second subpixel includes a first light emitting diode corresponding to a first sub-emission region, and a second light emitting diode corresponding to a second sub-emission region. The display device also includes a controller configured to control only the first light emitting diode of the second subpixel to emit light during a low gray level mode, and control the first light emitting diode and the second light emitting diode of the second subpixel to both emit light in a high gray level mode.