Optoelectronic Pixel Programming via Shifting Row Patterns
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Solution Overview
Problem
Optoelectronic light emitting devices, such as LED and μLED displays, face challenges in operating at suitable programming frequencies due to the limitations of thin-film transistors, which restrict the use of high-frequency pulse width modulation, leading to inefficiencies in programming and potential flickering issues.
Innovation Solution
An optoelectronic light emitting device with a programming device that utilizes a row pattern to program pixels in successive time intervals, shifting the pattern by at least one row each interval, allowing for low-cost TFT technology and efficient programming at lower frequencies, while using pulse width modulation to improve image quality and reduce flickering.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If thin-film transistors are used as display drivers, then manufacturing cost is reduced, but operating frequency is limited to approximately 1 MHz
Solution Approach 1:
The pixel matrix is divided into multiple segments, with each segment programmed independently by separate programming devices. This segmentation allows the total programming task to be distributed across multiple lower-frequency operations, making it compatible with TFT operating frequency limits while maintaining overall display functionality
Solution Approach 2:
The patent employs periodic programming cycles where different row patterns are applied in successive time intervals. By using multiple row patterns that cycle through different pixel rows periodically, the system achieves complete pixel matrix programming over multiple cycles at lower frequencies suitable for TFT operation
2Adaptability or versatility
If passive matrix switching with PWM is used, then programming flexibility is improved, but programming frequency must be increased to 50 or 100 MHz
Solution Approach 1:
The pixel matrix is divided into multiple segments that can be programmed independently. This segmentation enables the use of lower programming frequencies by distributing the programming load across multiple segments, while still maintaining PWM-based programming flexibility within each segment
Solution Approach 2:
Multiple row patterns are prepared in advance, where each pattern is designed to program specific pixel rows. These pre-configured patterns are applied in successive time intervals, allowing the system to achieve complete programming at lower frequencies by using predetermined programming sequences
3Productivity
If high programming frequencies are used, then programming speed is improved, but flickering increases and image quality deteriorates
Solution Approach 1:
The patent uses multiple row patterns applied in periodic succession, where each pattern programs different pixel rows. This periodic application distributes the programming activity over time, preventing the high-frequency pulsing that causes flickering while maintaining effective programming through the cumulative effect of multiple patterns
Solution Approach 2:
By dividing the pixel matrix into segments and programming them in succession using different row patterns, the system avoids concentrating all programming activity in a single high-frequency cycle. This segmented approach reduces the effective programming frequency per segment, thereby reducing flickering while maintaining overall programming efficiency
Data Source
AI summary
An optoelectronic light emitting device includes a plurality of programmable pixels arranged in a matrix of rows and columns, each pixel including at least one optoelectronic semiconductor component, and programming device configured to program the pixels in a plurality of successive time intervals. A row pattern including a subset of the rows of the matrix is given. The programming device is configured to program the pixels of those rows per time interval which are comprised by the row pattern. The row pattern is shifted by at least one row per time interval.