Adaptive Local Dimming Circuitry for Display Backlight Data Compression
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Solution Overview
Problem
Conventional LCD devices face challenges in efficiently managing local dimming data transmission for high screen display frequencies, particularly in reducing the amount of data required for transmission while maintaining image quality.
Innovation Solution
The implementation of a circuitry system that includes a local dimming control circuit and a backlight control circuit, which generates and transmits local dimming data with varying bit lengths for different light emitting units, using indication signals to combine and store bits efficiently, thereby reducing the overall data transmission while maintaining image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If local dimming data with fixed bit length is transmitted for each light emitting unit, then the transmission protocol is simple and easy to implement, but the total amount of data transmitted increases unnecessarily when adjacent units have similar brightness levels
Solution Approach 1:
The patent applies local quality by making the data transmission format adaptive to local characteristics of adjacent light emitting units. When brightness levels are similar, a compressed format with fewer bits is used; when brightness levels differ significantly, a full format with more bits is used. This resolves the contradiction by making the data structure locally optimized rather than uniformly fixed.
Solution Approach 2:
The patent implements dynamics by making the data transmission format changeable based on real-time brightness comparisons. The system dynamically selects between different data formats (compressed or full) for each light emitting unit based on whether its brightness differs from adjacent units, thereby reducing overall data volume while maintaining image quality.
2Manufacturing precision
If the number of light emitting units is increased to achieve higher resolution, then the display quality is improved, but the amount of local dimming data for transmission increases significantly
Solution Approach 1:
The patent applies local quality by transmitting detailed brightness information only for light emitting units where it is necessary (i.e., where brightness differs from neighbors), while using compressed or omitted data for units with similar brightness. This allows high resolution displays to be achieved without proportionally increasing data transmission volume.
Solution Approach 2:
The patent extracts and transmits only the essential brightness information needed for accurate local dimming. By comparing each light emitting unit's brightness with its neighbors and transmitting only the differences (or using run-length encoding), the system reduces data volume while maintaining the ability to render high-resolution images.
3Reliability
If full precision local dimming data is transmitted for all light emitting units, then image quality is maintained, but the transmission bandwidth and processing load increase
Solution Approach 1:
The patent changes the parameter of data precision dynamically based on the local image characteristics. Instead of using fixed full precision for all units, the system adjusts the number of bits transmitted for each light emitting unit based on whether its brightness differs from adjacent units, thereby maintaining image quality where needed while improving transmission efficiency elsewhere.
Solution Approach 2:
The patent applies partial action by transmitting full precision data only for the subset of light emitting units where it is necessary (those with different brightness from neighbors), while using compressed or omitted data for the remaining units. This partial transmission strategy maintains image quality for critical areas while improving overall transmission efficiency.
Data Source
AI summary
A circuitry for controlling a backlight module, the circuitry includes a local dimming control circuit and a backlight control circuit. The local dimming control circuit is configured to generate local dimming data based on image data and an arrangement of a plurality of light emitting units of the backlight module, in which the local dimming data includes a first local dimming data corresponding to a first light emitting unit of the plurality of light emitting units and a second local dimming data corresponding to a second light emitting unit of the plurality of light emitting units, and the number of bits of the first local dimming data is different from the number of bits of the second local dimming data. The backlight control circuit is configured to control the backlight module to irradiate backlight based on the local dimming data.