Sub-Frame Pixel Driving Layout for Low-Power OLED Displays
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Solution Overview
Problem
Existing display devices face challenges in achieving reduced power consumption while maintaining high display quality, particularly in multimedia electronic devices like televisions and mobile phones, where OLED technology offers superior image quality but is limited by power efficiency.
Innovation Solution
The display device incorporates a dual-sub-frame period operation with alternating activation of gate lines and data lines, utilizing a demultiplexer to connect pixels in a specific pattern, and control transistors to optimize power usage and image output, allowing for reduced power consumption without compromising display quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If all data lines and gate lines are activated simultaneously in traditional display devices, then complete image data can be transmitted to all pixels, but power consumption increases significantly
Solution Approach 1:
The display device divides the pixel array into two groups (first group connected to first gate lines, second group connected to second gate lines) and transmits image data to each group in separate sub-frame periods. This segmentation allows the display device to activate only the necessary data lines and gate lines for each sub-frame, reducing simultaneous line activations and lowering power consumption while ensuring complete image data transmission to all pixels over the full frame period
Solution Approach 2:
The display device employs periodic action by alternating between first sub-frame period and second sub-frame period, where different sets of gate lines and data lines are activated in each period. This periodic activation pattern ensures that all pixels receive their required image data over time while reducing peak power consumption compared to simultaneous activation of all lines
2Use of energy by moving object
If data lines are selectively activated in alternating sub-frames, then power consumption is reduced, but the complexity of the control system increases
Solution Approach 1:
The control system is segmented into separate control paths for first gate lines and second gate lines, with corresponding first data lines and second data lines. This segmentation allows independent control of each group, simplifying the control logic within each subgroup while managing overall system complexity through modular organization
Solution Approach 2:
The control system uses periodic action with alternating sub-frame periods to simplify control logic. By systematically activating first gate lines in the first sub-frame and second gate lines in the second sub-frame, the control system follows a predictable pattern that reduces the need for complex dynamic decision-making, thereby managing complexity while achieving power reduction
3Use of energy by moving object
If gate lines are sequentially activated in alternating patterns, then power consumption decreases, but the time required to refresh the display increases
Solution Approach 1:
The display refresh process is segmented into two parallel paths: first gate lines sequentially activate pixels in the first group during the first sub-frame period, while second gate lines sequentially activate pixels in the second group during the second sub-frame period. This segmentation allows simultaneous processing of different pixel groups, reducing overall refresh time compared to sequential processing of all pixels through a single gate line set
Solution Approach 2:
The display device uses periodic action with alternating sub-frame periods to maintain efficient refresh rates. By systematically switching between first and second gate line activations in alternating periods, the system ensures continuous pixel updates across the entire display, preventing time loss that would occur with slower sequential activation of all gate lines
Data Source
AI summary
A display device includes a plurality of data lines, a plurality of first gate lines, a plurality of second gate lines, and a plurality of pixels. The plurality of pixels includes a first group of pixels and a second group of pixels. The plurality of data lines includes a first group of data lines connected to the first group of pixels and a second group of data lines connected to the second group of pixels. A data signal is provided to the first group of pixels in a first sub-frame period of one frame period. A data signal is provided to the second group pixels in a second sub-frame period of the one frame period that is adjacent to the first sub-frame period.