Backlight Luminance Smoothing for Color Balance in Displays
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional image display devices experience degradation in color balance due to the faster response of light-emitting elements compared to phosphors in backlight systems, leading to noticeable color shifts when adjusting luminance settings.
Innovation Solution
An image display method that generates luminance setting data for each light-emitting region based on the average luminance value of preceding images, reducing significant luminance differences and thereby minimizing color balance degradation by adjusting the luminance settings of the backlight and gradation settings of the liquid crystal panel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the controller changes the setting values of the luminances of the light-emitting regions, then the contrast of the image can be improved, but the color balance of the light emitted from the light sources may degrade
Solution Approach 1:
The patent applies preliminary action by using the luminance setting data from the immediately preceding image as a reference when generating luminance setting data for the current image. This prevents abrupt luminance changes between frames, allowing the phosphor to keep pace with the light-emitting element's response, thereby maintaining color balance while still enabling local dimming contrast improvements.
2Productivity
If the controller adjusts luminance settings rapidly for local dimming, then image contrast is enhanced, but the response time difference between light-emitting elements and phosphors causes color shifts
Solution Approach 1:
The patent implements feedback by continuously monitoring the luminance setting data from previous images and using this information to adjust current luminance settings. This feedback mechanism ensures that luminance changes remain within the response capabilities of the phosphor material, maintaining color accuracy while preserving the speed and effectiveness of local dimming operations.
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
The method effectively reduces color balance degradation by smoothing luminance changes across light-emitting regions, maintaining consistent image quality and color accuracy.
Implementation Method 1
Each light source includes a light-emitting element, and a phosphor having a light emission peak wavelength different from that of the light-emitting element. Each light source is configured to emit white light by combination of the light emitted by the light-emitting element and the light converted by the phosphor.
Data Source
AI summary
An image display method includes, with respect to each of a plurality of input images, generating luminance setting data that sets a luminance value for each of a plurality of light-emitting regions of a backlight configured in a matrix form based on the input image, generating gradation setting data that sets a gradation value for each of a plurality of pixels of a liquid crystal panel coupled to the backlight, based on the generated luminance setting data and the input image, and controlling the backlight based on the luminance setting data and the liquid crystal panel based on the gradation setting data to display an image. At least one of the luminance setting data and the gradation setting data for a first input image among the plurality of input images is generated based on the luminance setting data for a second input image immediately preceding the first input image.