Sub-Pixel Display Layout for Uniform LED Current Distribution
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Solution Overview
Problem
In display devices, the uneven distribution of driving current to subminiature light emitting elements leads to non-uniform light emission, as the current is often focused on a specific element due to characteristic deviations, resulting in inefficient light output.
Innovation Solution
A display device design where each pixel is divided into sub-pixels connected to different read-out lines, allowing for independent control and sensing of characteristics, ensuring uniform light emission by distributing driving current evenly across multiple light emitting elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If multiple subminiature light emitting elements are used in each pixel, then light emission capability is improved, but current distribution becomes uneven due to characteristic deviations
Solution Approach 1:
The pixel is divided into multiple sub-pixels, each containing one or more light emitting elements. Each sub-pixel is independently controlled through separate read-out lines, allowing independent sensing and compensation of characteristic deviations. This segmentation enables uniform current distribution across all light emitting elements by compensating for individual variations in each sub-pixel group.
2Ease of operation
If driving current is concentrated on a specific light emitting element with lowest forward voltage, then ease of operation is improved, but light emission uniformity deteriorates
Solution Approach 1:
The patent implements a feedback mechanism where the read-out line senses the actual current flowing through each sub-pixel group and transmits this information back to the data driver. The data driver uses this feedback information to adjust and compensate for characteristic deviations, ensuring uniform current distribution across all light emitting elements while maintaining ease of control through automated adjustment.
Data Source
AI summary
A display device may include a first scan line, a first data line and a second data line, a first read-out line and a second read-out line. A first sub-pixel may be connected to the first scan line, the first data line, and the first read-out line. A second sub-pixel may be connected to the first scan line, the first data line, and the second read-out line. A third sub-pixel may be connected to the first scan line, the second data line, and the first read-out line. Each of the first sub-pixel, the second sub-pixel, and the third sub-pixel may include at least one light emitting element.