Display Device Backlight Control for Image Quality Stability
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Solution Overview
Problem
Display devices face image quality degradation when displaying dynamic or static images due to sudden changes in backlight luminance, which can result in wavering images when transitioning from dynamic to static content.
Innovation Solution
A display device with an image display panel, a light source section that controls luminance via dimming, and a control section that determines whether the image is dynamic or static based on light emission luminance changes, switching between static and dynamic image control speeds to prevent sudden luminance changes and lag.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If dimming control is applied to reduce power consumption, then power consumption is reduced, but image quality degradation occurs due to sudden luminance changes
Solution Approach 1:
The control section dynamically adjusts the dimming control speed based on the determined image type. For dynamic images, a first (faster) dimming control speed is used, while for static images, a second (slower) dimming control speed is applied. This dynamic adaptation allows the system to maintain image quality by preventing inappropriate luminance changes while still enabling power-saving dimming control to function effectively.
Solution Approach 2:
The system changes the control parameter (dimming control speed) based on the determined image type. By switching between a first dimming control speed for dynamic images and a second dimming control speed for static images, the system optimizes both power consumption and image quality according to the specific content being displayed.
2Speed
If fast dimming control is used for dynamic images, then image responsiveness is improved, but image quality degradation occurs due to lag in luminance adjustment
Solution Approach 1:
The control section dynamically selects the appropriate dimming control speed based on the determined image type. This dynamic switching between first dimming control speed (for dynamic images) and second dimming control speed (for static images) ensures that the control speed is always appropriate for the current content, preventing both responsiveness issues and lag artifacts.
Solution Approach 2:
The control section determines the image type based on luminance change information from the image signal, then uses this feedback to select the appropriate dimming control speed. This feedback mechanism ensures that the control system adapts its behavior to match the actual content being displayed, preventing image quality degradation from mismatched control speeds.
3Stability of the object's composition
If slow dimming control is used for static images, then image stability is maintained, but power consumption increases due to reduced control efficiency
Solution Approach 1:
The control section dynamically adjusts the dimming control speed based on the determined image type. By switching to a second (slower) dimming control speed specifically for static images, the system maintains image stability while optimizing power consumption through more efficient, less frequent luminance adjustments appropriate for non-changing content.
Solution Approach 2:
The system changes the control parameter (dimming control speed) based on the determined image type. By applying a second dimming control speed for static images, the system optimizes the balance between image stability and power consumption, using slower control only when necessary for static content while faster control is reserved for dynamic content.
4Device complexity
If uniform dimming control speed is applied to all images, then control simplicity is maintained, but image quality degradation occurs during transitions between dynamic and static content
Solution Approach 1:
The control section dynamically determines the image type based on luminance change information and switches between first and second dimming control speeds accordingly. This dynamic approach maintains relatively simple control logic while significantly improving image quality during transitions by adapting the control speed to the actual content type.
Solution Approach 2:
The system changes the control parameter (dimming control speed) based on the determined image type, switching between first and second speeds. This parameter change approach maintains control simplicity by using a clear conditional structure while effectively preventing image quality degradation that would occur with uniform control speed applied to all image types.
Data Source
AI summary
A display device includes an image display panel section which displays an image on the basis of an image signal, a light source section which emits light to the image display panel section by dimming control according to a control signal based on the image signal, and a control section which determines on the basis of the image signal from a mode of change in light emission luminance of the light source section whether the image displayed by the image display panel section is a dynamic image or a static image and which performs switching according to a determination result between a static image control speed and a dynamic image control speed of the dimming control. The display device suppresses image quality degradation caused at the time of displaying a dynamic image or a static image.