Pixel Circuit Switching for Low-Grayscale OLED Display Control
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Solution Overview
Problem
Current display devices face challenges in accurately representing low-grayscale images due to limitations in controlling the number of light emitting elements and current flow, which affects color gamut and display quality.
Innovation Solution
A display device with a pixel structure that includes a series/parallel connection of light emitting elements, a driving transistor, and switching transistors, where the number of emitting elements is adjusted based on grayscale values using a data processor and driver to generate mode signals, allowing for precise control of light emission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the number of light emitting elements is increased to improve display quality, then the brightness and visibility are enhanced, but the control precision for low-grayscale images deteriorates due to current flow limitations
Solution Approach 1:
The light emitting element array is segmented into multiple groups that can be independently controlled. By activating different numbers of light emitting elements based on grayscale values, the patent achieves precise control over light output intensity. This segmentation allows the system to represent low-grayscale images accurately by adjusting which specific elements are activated rather than relying solely on current modulation.
Solution Approach 2:
The patent implements dynamic switching between different connection configurations (series/parallel) of light emitting elements based on the grayscale value being displayed. This dynamic reconfiguration allows the system to adapt its electrical characteristics to match the required brightness level, maintaining control precision across the entire grayscale range from 0 to 255.
2Adaptability or versatility
If series connection of light emitting elements is used to extend grayscale range, then the maximum grayscale value increases, but the minimum grayscale representation capability deteriorates
Solution Approach 1:
The patent merges series and parallel connection configurations within the same light emitting element array. By combining these different connection modes, the system can achieve both extended grayscale range and improved low-grayscale representation. The parallel paths provide additional current pathways that enable finer control over minimum brightness levels while maintaining the extended grayscale capability provided by series connections.
3Adaptability or versatility
If more light emitting elements are activated to improve color gamut, then the color saturation is enhanced, but the low-grayscale image quality deteriorates due to insufficient current control
Solution Approach 1:
The patent applies local quality control by enabling independent activation and control of different groups of light emitting elements. This allows certain elements to be optimized for color saturation while others are controlled for precise brightness modulation in low-grayscale regions. The selective activation strategy ensures that color gamut is maintained while low-grayscale image quality is protected through localized control mechanisms.
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
Enhances the representation performance of low-grayscale images by adjusting the number of emitting elements and current flow, improving display quality and reducing color gamut shifts.
Implementation Method 1
a first light emitting element electrically connected between the first electrode and the first intermediate electrode; a second light emitting element electrically connected between the first intermediate electrode and the second intermediate electrode
Data Source
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AI summary
A display device may include a pixel. The pixel may include: a first electrode, a second electrode, and an intermediate electrode; light emitting elements, at least some of the light emitting elements being connected in series with each other through the intermediate electrode between the first electrode and the second electrode; a driving transistor configured to provide a driving current to the light emitting elements between a first power line and a second power line; and a first switching transistor connected in parallel with some of the light emitting elements and connected in series with remaining ones of the light emitting elements.