LCD Data Driver Common Grayscale Voltage Generator
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Solution Overview
Problem
Conventional LCD devices for mobile devices have a large data driver due to separate gamma usage, increasing the overall size and power consumption, as they require multiple decoders for each color channel to transmit 256 grayscale voltages.
Innovation Solution
A data driver with a common grayscale voltage generator, data processing unit, and data signal output unit that expands and adjusts image data using a single set of common grayscale voltages, reducing the need for multiple decoders and power consumption by using a single common grayscale voltage generator for all color channels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If separate gamma is used for each color channel (R, G, B) to provide 256 grayscale voltages, then the grayscale voltage selection capability is improved, but the data driver area increases due to multiple decoders
Solution Approach 1:
The patent merges the separate grayscale voltage generation for R, G, and B channels into a single common grayscale voltage generator. Instead of having three separate decoders each handling 256 grayscale levels, the invention uses one decoder to generate a shared set of grayscale voltages that are then distributed to all color channels, significantly reducing the overall decoder area in the data driver.
Solution Approach 2:
The common grayscale voltage generator serves multiple functions by providing grayscale voltages to all three color channels (R, G, B) simultaneously. This universal approach allows a single decoder to fulfill what previously required three separate decoders, reducing hardware redundancy while maintaining full grayscale control capability across all channels.
2Adaptability or versatility
If separate grayscale voltage blocks are used for R, G, and B image data, then the color channel control capability is improved, but the power consumption increases
Solution Approach 1:
The patent combines three separate grayscale voltage blocks into a single common grayscale voltage generator. This consolidation reduces the total power consumption by eliminating redundant voltage generation circuits while maintaining the ability to independently control grayscale levels for each color channel through the shared voltage set.
Solution Approach 2:
The common grayscale voltage generator is designed to serve all color channels universally, reducing the overall power requirements. By using a single power-efficient voltage generation circuit that can be selectively applied to R, G, and B channels, the system achieves lower total power consumption compared to maintaining three separate high-power voltage blocks.
3Productivity
If multiple decoders are used to transmit 256 grayscale voltages for each color channel, then the image data processing capability is improved, but the overall device size increases
Solution Approach 1:
The patent merges multiple decoder units into a single decoder that handles grayscale voltage generation for all color channels. This consolidation maintains full image data processing capability by preserving the 256 grayscale level resolution while reducing the physical footprint from three separate decoder blocks to one shared decoder, thereby reducing overall device size.
Data Source
AI summary
A data driver for driving a liquid crystal display (LCD) device includes a common grayscale voltage generator configured to output a plurality of common grayscale voltages, a data processing unit configured to expand externally input image data to provide expanded image data and to adjust an offset of the expanded image data to output data offset adjusted image data, and a data signal output unit configured to output as data signals a first grayscale voltage corresponding to the expanded image data and a second grayscale voltage corresponding to the data offset adjusted image data among the plurality of common grayscale voltages.