Per-Area Luminance Control Without Sensors
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Solution Overview
Problem
Existing display technologies face challenges in displaying images with appropriate luminance, particularly for high-contrast images, and require complex configurations involving luminance and temperature sensors.
Innovation Solution
A display device with a partitioned display unit, an image processing unit, and a display control unit that adjusts luminance on a per-area basis by modifying signal levels and determining outputtable maximum luminance, allowing for simpler configuration and effective luminance adjustment without sensors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If luminance sensors and temperature sensors are used to control luminance, then appropriate luminance can be displayed, but device complexity increases
Solution Approach 1:
The patent extracts and eliminates the luminance sensor and temperature sensor from the system. Instead of using sensors to detect luminance and temperature, the invention uses a per-area backlight control mechanism that directly adjusts luminance based on image content and display characteristics, thereby achieving appropriate luminance display without the complexity of sensor configurations
Solution Approach 2:
The patent replaces the mechanical/sensor-based luminance detection system with an electronic control system. The display control unit electronically determines outputtable maximum luminance and adjusts backlight luminance on a per-area basis using electrical signals, substituting the need for physical sensors with electronic processing and control
2Measurement precision
If per-area luminance adjustment is implemented, then appropriate luminance can be displayed, but device complexity increases
Solution Approach 1:
The patent divides the backlight into multiple independently controllable areas corresponding to different display regions. Each area can adjust its luminance separately based on the image content displayed in that region, enabling precise per-area luminance control. This segmentation allows the system to achieve appropriate luminance without requiring a completely new control architecture, as it builds upon existing display hardware
Solution Approach 2:
The patent implements dynamic luminance adjustment where the backlight luminance for each area is continuously adapted based on the displayed image content. The display control unit dynamically determines outputtable maximum luminance and adjusts backlight emission in real-time, allowing the system to achieve appropriate luminance while using a manageable control complexity that adapts to different display conditions
3Reliability
If compression operation on luminance gradation is performed, then image degradation can be controlled, but appropriate luminance cannot be displayed
Solution Approach 1:
The patent applies local quality control by adjusting luminance independently for different areas of the display based on the local image content. Instead of applying a uniform compression operation across the entire image, the system identifies regions with different luminance requirements and adjusts each region's backlight accordingly. This allows the system to maintain image quality stability while achieving appropriate luminance display, as each area is optimized for its specific content requirements
Data Source
AI summary
A technique of displaying an image at adequate luminance with a configuration simpler than a configuration in related art is disclosed. A display device (1) includes a display unit (40) that is configured such that luminance of an image to be displayed is adjustable on a per area basis of multiple areas, an image processing unit (32) that generates an output image by modifying a signal level of an input image in a current frame by referencing process information concerning a preceding frame generated by a process information generation unit (34) in the preceding frame, and a display control unit (36) that determines maximum luminance, adjusts luminance on a per area basis of the multiple areas, and displays the output image at the adjusted luminance.