Light-emission control device for liquid-crystal display flicker reduction
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Solution Overview
Problem
Conventional liquid-crystal display apparatuses with area-by-area light source control struggle to accurately display video images with sharp brightness variations and may experience flickering due to insufficient luminance and power consumption issues.
Innovation Solution
A light-emission control device that includes a light-value calculator, a light-value modifying module, and a light controller, which calculates and modifies light values for each light source area based on surrounding areas, using spatial filters to adjust light emission and reduce flicker while maintaining power efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If area-by-area light source control is implemented to reduce power consumption, then power consumption is reduced, but luminance accuracy deteriorates for images with sharp brightness variations
Solution Approach 1:
The patent applies local quality by differentiating light value calculation approaches based on spatial characteristics. For general areas, standard light value calculation is used, while for specific areas with sharp brightness variations, modified light value calculation incorporating surrounding area information is applied. This selective approach maintains luminance accuracy where needed while preserving power consumption benefits in other areas.
Solution Approach 2:
The patent implements preliminary action by pre-calculating light values for all light sources based on surrounding area information before actual display. The light value modifying module pre-adjusts light values for areas that may experience sharp brightness variations, ensuring accurate luminance display before the actual rendering occurs, thereby preventing flicker and improving display quality.
2Measurement precision
If light value is adjusted for each light source area to control luminance, then luminance control is improved, but flicker occurs in images with sharp brightness variations
Solution Approach 1:
The patent implements feedback by using surrounding area light values to modify target area light values. The light value modifying module references light values from adjacent areas to adjust the light value of the target area, creating a feedback mechanism that smooths abrupt transitions. This feedback approach prevents flicker by ensuring that light value changes in one area are coordinated with changes in surrounding areas, thereby maintaining display stability.
Solution Approach 2:
The patent applies parameter changes by modifying the light value parameter based on spatial relationships. Instead of using fixed light values, the system dynamically adjusts light values by incorporating information from surrounding areas. This parameter modification approach smooths transitions between different brightness regions and eliminates flicker while maintaining accurate luminance control.
3Illumination intensity
If maximum luminance is used for each screen area to ensure visibility, then luminance is improved, but power consumption increases
Solution Approach 1:
The patent applies partial action by selectively enhancing luminance only in specific areas where sharp brightness variations occur, rather than uniformly increasing luminance across all areas. The light value modifying module identifies areas that require enhanced luminance control and applies modified light values only to those specific regions, thereby maintaining visibility where needed while avoiding unnecessary power consumption in other areas.
Data Source
AI summary
According to one embodiment, a light-emission control device controls light emission of light sources of a light emitter including a plurality of light source areas each corresponding to one of the light sources, and includes a light-value calculator, a light-value modifying module, and a light controller. The light-value calculator calculates a light value for each of the light source areas. The light source areas include a target area for which a light value is to be modified and surrounding areas surrounding the target area. The light-value modifying module modifies a light value calculated for the target area using light values for the surrounding areas. The light controller lights a light source in the target area based on the modified light value.