Local Dimming Control Using Changed-Area Time-Division Analysis
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Solution Overview
Problem
In in-vehicle display systems, generating control information for local dimming on the liquid crystal display side increases circuit size and cost, as existing methods require extensive processing and memory to handle image changes across multiple frames.
Innovation Solution
A control device with a processor and memory that identifies changed areas in images and analyzes them in time division processing units, generating control information only for those areas, reducing the need for large-capacity frame memory and circuit size by processing images column by column over multiple frames.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If control information for local dimming is generated on the liquid crystal display side, then image quality and contrast are improved, but circuit size and cost increase
Solution Approach 1:
The patent divides the image processing task into segments: changed area detection is performed on the head unit side, while only the specific changed areas are analyzed and control information is generated on the liquid crystal display side. This segmentation allows local dimming to be implemented without requiring the entire image processing circuit to be on the display, thus reducing circuit size while maintaining image quality.
Solution Approach 2:
The patent extracts only the changed areas from the full image for processing on the liquid crystal display side. By taking out and transmitting only the relevant changed region information rather than processing the entire image, the circuit complexity on the display side is reduced while still achieving the local dimming effect for improved image quality.
2Illumination intensity
If control information for local dimming is generated on the liquid crystal display side, then image quality and contrast are improved, but cost increases
Solution Approach 1:
The processing workload is segmented between the head unit and liquid crystal display, with only essential changed area analysis performed on the display side. This reduces the hardware requirements and manufacturing cost of the liquid crystal display while still enabling local dimming for improved image quality.
Solution Approach 2:
By extracting and transmitting only the changed area information rather than full image data, the patent reduces the processing power and memory requirements on the liquid crystal display side, thereby lowering manufacturing costs while maintaining the image quality benefits of local dimming.
3Productivity
If extensive frame memory and high-performance units are used, then local dimming processing capability is improved, but circuit size increases
Solution Approach 1:
The head unit performs preliminary actions by detecting changed areas and transmitting only this essential information to the liquid crystal display. This preliminary processing eliminates the need for the display to store and analyze entire frames, reducing the requirement for large frame memory and high-performance processing units on the display side.
Solution Approach 2:
The patent extracts only the essential changed area information from the full image and transmits it to the liquid crystal display. This extraction approach allows local dimming processing to be performed with minimal memory and processing power on the display side, avoiding the need for extensive frame memory and high-performance units.
Data Source
AI summary
A control device that executes a local dimming process of a display, the control device, includes a memory; and a processor configured to execute a process including identifying a changed area in which an image is changed in a frame to be displayed on the display, analyzing, in a case where the changed area is identified, every time a frame to be displayed on the display is received, the image in the changed area in the received frame, in a corresponding one of first units for processing so that the image in the changed area is analyzed in the first units for processing over multiple frames by time division processing, and generating control information for controlling the local dimming process for a corresponding area on the display, every time an analysis result with respect to the image in the first unit of processing is output.