Oxide Semiconductor Pixel Circuit for Selective Source Line Refresh
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Solution Overview
Problem
Liquid crystal display devices face challenges in reducing power consumption, especially when displaying static or mixed static and moving images, as they require frequent voltage application to all source lines, leading to increased power usage.
Innovation Solution
The implementation of a display device configuration that includes a gate line and source line arrangement with pixel circuits comprising switches, capacitors, and inverters formed from oxide semiconductor layers, allowing for efficient image data storage and refresh operations to minimize power consumption by selectively applying voltage only where necessary.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If voltage is applied to all source lines frequently to maintain image quality, then display quality is maintained, but power consumption increases
Solution Approach 1:
The display area is divided into multiple segments corresponding to different source line groups. Each segment can be independently controlled and refreshed based on its content requirements (static or moving images), allowing selective voltage application to only those segments that need updating.
Solution Approach 2:
Different refresh strategies are applied to different regions of the display. Static image regions use minimal refresh operations while moving image regions receive frequent updates. This local differentiation optimizes power consumption by adapting the refresh rate to the actual content requirements of each region.
2Stability of the object's composition
If pixel signals are supplied to all source lines continuously to ensure image stability, then image stability is maintained, but power consumption increases
Solution Approach 1:
Instead of continuous signal supply, periodic refresh operations are implemented. The display system refreshes pixel signals at specific intervals based on the static or moving nature of the content in each segment, reducing the frequency of voltage application while maintaining image stability.
Solution Approach 2:
Pixel circuits include memory elements that store pixel signals in advance. This preliminary storage allows the display to maintain stable images between refresh cycles without requiring continuous signal supply, as the stored signals are retained until the next scheduled refresh.
3Reliability
If refresh operations are performed on all source lines to prevent image degradation, then image quality is maintained, but power consumption increases
Solution Approach 1:
Refresh operations are segmented by source line groups rather than applied uniformly to all lines. Each segment undergoes refresh operations independently based on its content characteristics, allowing the system to perform necessary refreshes only where needed to prevent image degradation.
Solution Approach 2:
The system performs partial refresh operations on only those source line segments that require it, rather than applying excessive refresh operations to the entire display. This selective approach maintains image quality where necessary while minimizing unnecessary energy expenditure in static regions.
Data Source
AI summary
According to one embodiment, a display device includes a pixel circuit including first, second and third switches, a capacitor and an inverter, and a pixel electrode connected to the pixel circuit, the first switch including a first control electrode connected to a gate line and a first input terminal connected to a source line, the capacitor including a first terminal connected to a reference potential and a second terminal connected to the first output terminal, the third switch including a second input terminal and a second output terminal connected to the second terminal, and the second switch and the inverter being connected in series between the second terminal and the second input terminal.