LCD Driving Method for Flicker and Blur Reduction
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Solution Overview
Problem
LCD displays face issues with flickering when showing static frames due to hold-type backlight sources and frame blurring when displaying dynamic frames due to impulse-type sources, failing to match the performance of CRT displays in both scenarios.
Innovation Solution
A driving method for LCDs that determines whether a frame is static or dynamic by comparing pixel grey levels and adjusts the light source's duty ratio and amplitude accordingly, switching between hold-type and impulse-type driving methods to optimize display quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If hold-type backlight source is used for displaying static frames, then flickering is eliminated and viewing comfort is improved, but frame blurring occurs when displaying dynamic frames
Solution Approach 1:
The patent applies dynamics by transitioning from a static hold-type backlight driving method to a dynamic driving method that adapts to different frame types. The system dynamically switches between hold-type and impulse-type driving based on frame detection, allowing the backlight to respond differently to static and dynamic content, thereby eliminating both flickering in static frames and blurring in dynamic frames.
Solution Approach 2:
The patent changes the driving parameters of the backlight source based on the type of frame being displayed. By detecting whether a frame is static or dynamic and adjusting the backlight driving mode accordingly (hold-type for static, impulse-type for dynamic), the system optimizes display quality for different content types, resolving the contradiction between viewing comfort and display quality.
2Manufacturing precision
If impulse-type backlight source is used for displaying dynamic frames, then frame blurring is reduced and display quality is improved, but flickering occurs when displaying static frames
Solution Approach 1:
The system dynamically adjusts the backlight driving method based on the detected frame type. When dynamic frames are detected, impulse-type driving is applied to reduce blurring; when static frames are detected, hold-type driving is applied to eliminate flickering. This dynamic adaptation resolves the contradiction between display quality and viewing comfort.
Solution Approach 2:
The patent changes the backlight driving parameters based on frame characteristics. By switching between hold-type and impulse-type driving modes according to whether the content is static or dynamic, the system optimizes both display quality and viewing comfort, eliminating the flickering issue while maintaining sharp dynamic frame rendering.
3Manufacturing precision
If CRT display with impulse type driving is used, then dynamic frame display quality is good, but flickering occurs in static frames causing viewer discomfort
Solution Approach 1:
The patent applies dynamics by making the backlight driving method adaptive rather than fixed. The system detects the frame type and dynamically switches between impulse-type driving (for dynamic frames to maintain quality) and hold-type driving (for static frames to eliminate flickering), thereby resolving the contradiction between display quality and flickering.
Solution Approach 2:
The patent changes the backlight driving parameters based on the detected frame type. By switching between impulse-type and hold-type driving modes, the system maintains good display quality for dynamic frames while eliminating flickering in static frames, thus resolving the contradiction between display quality and harmful flickering effects.
4Reliability
If LCD display with hold type driving is used, then flickering is eliminated in static frames, but frame blurring occurs in dynamic frames
Solution Approach 1:
The patent transforms the static hold-type driving into a dynamic system that can switch between hold-type and impulse-type driving based on frame detection. This dynamic adaptation allows the system to maintain viewing comfort for static frames while improving display quality for dynamic frames, resolving the contradiction between the two.
Solution Approach 2:
The patent changes the backlight driving parameters based on frame characteristics. By switching from fixed hold-type driving to adaptive driving that selects between hold-type and impulse-type modes, the system maintains viewing comfort while improving display quality for dynamic content, resolving the contradiction between comfort and quality.
Data Source
AI summary
In a display device having a light source and a storage for storing at least one reference frame of image data, a driving method includes receiving a current frame of image data; comparing grey levels between pixels of the current frame of image data and the corresponding pixels of the reference frame of image data; determining a pixel quantity of pixels having different grey levels in the current frame of image data and the reference frame of image data; and based on the determined pixel quantity, calculating and outputting a signal controlling a light emitting duty ratio and an amplitude of the light source while displaying the current frame. The display device further has a comparing unit and light source control unit for performing the driving method.