Semiconductor Display Device Scan Line Driver Circuit Power Reduction
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Solution Overview
Problem
Active-matrix semiconductor display devices face challenges in reducing power consumption and enhancing reliability due to high driving frequency requirements and the occurrence of burn-in phenomena, especially in liquid crystal display devices and organic light-emitting devices, which lead to increased power consumption and potential deterioration of semiconductor elements.
Innovation Solution
A semiconductor display device with a scan line driver circuit that selectively activates only the necessary rows of pixels for display, using a decoder to input pulses only to scan lines of rows performing display, while oxide semiconductors are used for the channel formation region in thin film transistors to reduce power consumption and prevent element deterioration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If high driving frequency is used to increase productivity, then productivity is improved, but power consumption increases and reliability deteriorates
Solution Approach 1:
The patent segments the scan line driving into multiple channels, where each channel drives a specific group of scan lines. This allows independent control of different scan line groups, enabling selective activation of only necessary channels based on display content requirements, thereby reducing overall power consumption while maintaining high driving frequency for active regions
Solution Approach 2:
The patent implements dynamic control of scan line activation by detecting whether pixels in each scan line group require updating. Channels are dynamically activated or deactivated based on real-time display content analysis, allowing the system to adapt driving frequency and power consumption to actual display needs rather than operating at maximum frequency continuously
2Reliability
If continuous display is performed to maintain image quality, then reliability is improved, but burn-in occurs due to prolonged element activation
Solution Approach 1:
The patent implements periodic scanning and updating of pixel groups through multiple channels. By distributing the display refresh across different time periods and channels, no single pixel group remains continuously activated, thereby preventing burn-in while maintaining overall image quality stability through systematic rotation and refresh of display content
3Area of stationary object
If all scan lines are activated for full display, then area coverage is improved, but power consumption increases
Solution Approach 1:
The patent divides the display area into multiple scan line groups, each controlled by a separate channel. This segmentation enables selective activation of only those channels whose corresponding scan line groups contain pixels requiring update, thereby covering the necessary display area while minimizing power consumption by leaving other channels inactive
Solution Approach 2:
The patent activates only the necessary portion of scan lines required for current display content rather than all scan lines. By applying partial action to only the required scan line groups, the system achieves adequate display coverage for the current frame while significantly reducing power consumption compared to full-screen continuous activation
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach reduces power consumption by minimizing the number of active scan lines and prevents burn-in by selectively displaying images, thereby enhancing the reliability and longevity of the semiconductor display device.
Implementation Method 1
A thin film transistor, a channel formation region of which is formed using such a metal oxide having semiconductor characteristics
Data Source
AI summary
It is an object to provide a semiconductor display device with high reliability. Further, it is an object to provide a semiconductor display device which can reduce power consumption. A decoder is provided for a scan line driver circuit and operates such that, in accordance with a signal input to the scan line driver circuit, a pulse is sequentially input only to scan lines included in pixels of rows performing display and a pulse is not input to scan lines included in pixels of rows at which display is not performed. Then, all pixels or part of pixels in the line selected by the pulse is supplied with a video signal from a signal line driver circuit, whereby display of an image is performed in pixels arranged in the specific area of the pixel portion.