Display Unit Segmenting Pixels for Intermittent Still Image Drive
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Solution Overview
Problem
Existing display units face challenges in reducing power consumption while maintaining image quality, particularly during still image display, as continuous display drive leads to increased power consumption and potential image degradation due to leakage currents.
Innovation Solution
The display unit divides pixels into groups and independently performs intermittent stopping of display drive for each group during still image display, adjusting the light-emission periods using light-emission control switches to minimize power consumption and prevent image quality degradation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If continuous display drive is performed during still image display, then image quality is maintained, but power consumption increases
Solution Approach 1:
The display panel is divided into multiple scan line groups (odd-numbered and even-numbered scan lines), allowing independent control of display drive for each group. This segmentation enables alternating interruption of display drive between groups, reducing overall power consumption while maintaining image quality through periodic refresh of each group.
Solution Approach 2:
The display drive is interrupted periodically for each scan line group during still image display. Odd-numbered scan lines are refreshed during odd frames while even-numbered scan lines are interrupted, then vice versa during even frames. This periodic action reduces power consumption compared to continuous drive while preventing image degradation through regular refresh cycles.
2Use of energy by moving object
If display drive is interrupted to reduce power consumption, then power consumption decreases, but image quality degrades due to leakage currents
Solution Approach 1:
Display drive is interrupted periodically rather than continuously, with each scan line group refreshed at regular intervals. This periodic refresh prevents charge leakage from causing significant image degradation while allowing power consumption to decrease during interruption periods. The balance between interruption duration and refresh frequency optimizes both power savings and image quality maintenance.
Solution Approach 2:
Capacitors in the pixel circuits are charged with image signal voltages before display drive interruption occurs. This preliminary charging action stores the necessary charge to maintain display output during the interruption period, preventing image degradation caused by leakage currents until the next refresh cycle.
3Use of energy by moving object
If intermittent stopping is applied to all pixels simultaneously, then power consumption reduces significantly, but noticeable flickers occur
Solution Approach 1:
The display panel is divided into multiple scan line groups that are refreshed alternately rather than simultaneously. During odd frames, odd-numbered scan lines are refreshed while even-numbered scan lines are interrupted, and vice versa during even frames. This segmentation distributes the refresh action across time and groups, preventing simultaneous interruption of all pixels and thereby eliminating noticeable flickers while still achieving power consumption reduction.
Data Source
AI summary
A display unit includes a plurality of pixels and a drive circuit. The plurality of pixels each includes a light emitting device, a transistor, and a capacitor. The drive circuit writes an image signal into each of the pixels and thereby performs display drive. The pixels as a whole are dividable into a plurality of pixel groups. The drive circuit performs intermittent stopping of the display drive for the respective pixel groups independently of each other in a still image display period based on the image signal.