Dual Gate Driving for Flat Display Power Optimization
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Solution Overview
Problem
Flat display devices, particularly LCDs, face high power consumption due to continuous operation of gate driving portions during both still and moving image modes, leading to increased energy usage and potential image distortion issues.
Innovation Solution
Implementing a dual gate driving system where the first and second gate driving portions alternate operation per frame in still image mode and per field in moving image mode, with the field being shorter than the frame, to optimize power usage and reduce unnecessary operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the gate driving portions operate continuously in both still image mode and moving image mode, then the display can maintain consistent operation and avoid image distortion, but power consumption increases significantly
Solution Approach 1:
The patent applies dynamics by making the gate driving operation mode adjustable based on display content. The system dynamically switches between continuous operation mode (for moving images) and alternate operation mode (for still images), optimizing power consumption while maintaining display reliability. This is achieved through a control unit that detects whether the displayed image is static or dynamic and adjusts the gate driving frequency accordingly.
Solution Approach 2:
The patent changes the operating parameters of the gate driving portions based on the type of content being displayed. For still images, the system reduces the gate driving frequency by operating alternately, while for moving images, it maintains full frequency operation. This parameter adjustment resolves the contradiction between power consumption and display reliability.
2Reliability
If the gate driving portions operate at full frequency for moving images, then image quality is maintained, but power consumption increases compared to still image mode
Solution Approach 1:
The system dynamically adjusts gate driving operation based on content type. When detecting moving images, the gate driving portions operate at full frequency to maintain image quality. When detecting still images, the system switches to alternate operation mode to reduce power consumption. This dynamic adaptation resolves the contradiction between maintaining image quality and reducing power consumption.
3Device complexity
If a single gate driving portion operates alone, then device complexity is reduced, but display performance and reliability deteriorate
Solution Approach 1:
The patent divides the gate driving function into multiple independent gate driving portions that can operate separately or in coordination. This segmentation allows the system to use multiple portions for high-performance applications while still providing power-saving mode by operating portions alternately. The segmented structure resolves the contradiction between device complexity and display performance.
Solution Approach 2:
The patent combines multiple gate driving portions to work together for displaying images. The control unit coordinates these portions to operate simultaneously or alternately based on display requirements. This merging approach maintains high display performance when needed while enabling power-saving operation by selectively activating portions, thus resolving the contradiction between complexity and performance.
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 unnecessary gate driving operations, especially during still image display, while maintaining image quality without causing flicker or distortion, and allows for equal data refresh rates in both modes, improving display efficiency.
Implementation Method 1
The two substrates include electrodes that face each other such that a voltage applied between the electrodes induces an electric field across the liquid crystal material. Alignment of the liquid crystal molecules in the liquid crystal material changes in accordance with the intensity of the induced electric field into the direction of the induced electric field, thereby changing the light transmissivity of the LCD device.
Data Source
AI summary
A flat display device includes a flat panel including a plurality of gate lines; a first gate driving portion connected to odd gate lines among the plurality of gate lines; a second gate driving portion connected to even gate lines among the plurality of gate lines; a driving mode selection portion generating a driving mode signal corresponding to source output inputted thereto; and a timing control portion operating in a moving image mode or a still image mode in response to the driving mode signal, wherein the first and second gate driving portions alternately operate per a frame in the still image mode, or wherein the first and second gate driving portions alternately operate per a field in the moving image mode, in which the field is shorter than the frame.