Display Driver Switching Between Column and Frame Inversion Modes
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Solution Overview
Problem
Conventional liquid crystal display devices face challenges in achieving high display quality while reducing power consumption, as existing driving methods either increase power consumption to prevent flicker or compromise on image quality to reduce power usage.
Innovation Solution
A display device and method that switches between a column inversion driving mode for high frame rate multicolor display and a frame inversion driving mode for low frame rate limited color display, using a common electrode with constant DC or AC voltage, respectively, to optimize power consumption and image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If column inversion driving method is used to prevent flicker and maintain high display quality, then display quality is improved, but power consumption is increased
Solution Approach 1:
The patent applies dynamics by enabling the display device to dynamically switch between column inversion driving mode and frame inversion driving mode based on display content requirements. The controller selects the appropriate driving mode to balance display quality and power consumption, making the system adaptive rather than static.
Solution Approach 2:
The patent changes the driving mode parameter (from fixed column inversion to switchable between column inversion and frame inversion) to optimize performance. By adjusting this parameter based on whether high display quality or low power consumption is prioritized, the system resolves the contradiction between display quality and power consumption.
2Use of energy by moving object
If frame inversion driving method is used to reduce power consumption, then power consumption is reduced, but display quality deteriorates due to flicker
Solution Approach 1:
The system dynamically adjusts the driving mode based on real-time requirements. When power consumption needs to be reduced, frame inversion mode is selected; when display quality is prioritized, column inversion mode is used. This dynamic adaptation resolves the contradiction.
Solution Approach 2:
By changing the driving mode parameter between frame inversion and column inversion, the system can selectively reduce power consumption or maintain display quality depending on the prioritized objective, thus resolving the contradiction.
3Stability of the object's composition
If complicated polarity inversion pattern is used to prevent flicker, then flicker is reduced, but power consumption is increased
Solution Approach 1:
The patent makes the polarity inversion pattern dynamic by allowing switching between column inversion (complicated pattern for flicker prevention) and frame inversion (simpler pattern for lower power consumption). The system adapts the inversion pattern complexity based on whether flicker prevention or power savings is the current priority.
Solution Approach 2:
The inversion pattern parameter is changed between column inversion and frame inversion modes. This parameter change allows the system to balance flicker prevention requirements against power consumption constraints, resolving the contradiction.
4Illumination intensity
If power supply voltage is boosted to secure high display quality, then display quality is improved, but power consumption is increased
Solution Approach 1:
Instead of always using high power supply voltage, the patent changes the driving mode parameter to select between column inversion (requiring higher voltage for high display quality) and frame inversion (allowing lower voltage for reduced power consumption). This parameter change resolves the contradiction between display quality and power consumption.
Data Source
AI summary
According to an aspect, a display device includes an image display panel and a driver driving the image display panel. The driver implements a first display mode in which a common voltage is a constant DC voltage; polarity of the video signal is inverted per a predetermined number of video signal lines; and the polarity of the video signal per a predetermined number of video signal lines is inverted in a frame unit, and a second display mode in which the common voltage is an AC voltage, polarity of which is inverted in a frame unit; the polarity of the video signal is opposite to the polarity of the common voltage; and the polarity of the video signal is inverted to be opposite to the polarity of the common voltage in a frame unit, and switches between these modes according to a mode switching signal from the outside.