Display Driver Compression Circuit for EMI Reduction
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Solution Overview
Problem
Liquid crystal display devices performing multiplied-speed driving experience increased data transfer amounts, leading to high-speed data transfer requirements that can cause electromagnetic interference (EMI) and higher power consumption.
Innovation Solution
A display device configuration that includes a controller performing multiplied-speed drive processing on original image data, generating compressed image data, and transferring it to a driver for decompression and panel driving, reducing data transfer amounts and eliminating the need for high-speed data transfer within the device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiplied-speed driving is performed to improve image quality and reduce motion blur, then image quality is improved, but data transfer amount increases causing EMI and power consumption issues
Solution Approach 1:
The patent extracts the compression function from the controller and places it in the data driver, separating the high-speed processing requirement from the data transfer path. This allows the controller to work at normal speed while the data driver handles the multiplied-speed driving locally, eliminating the EMI and power consumption problems caused by high-speed data transfer.
Solution Approach 2:
The patent segments the image processing function by dividing it into two parts: the controller generates compressed image data at normal speed, and the data driver performs decompression and multiplied-speed driving locally. This segmentation allows each component to operate at optimal speeds without requiring high-speed data transfer between them.
2Reliability
If multiplied-speed driving is performed to reduce motion blur, then motion blur is reduced, but data transfer speed requirements increase
Solution Approach 1:
The patent extracts the high-speed decompression function from the controller and places it in the data driver. This allows the data driver to perform multiplied-speed driving locally without requiring high-speed data transfer from the controller, which continues to operate at normal speed with compressed data.
Solution Approach 2:
The controller performs compression in advance before data transfer, reducing the data amount that needs to be transferred. This preliminary action allows the data transfer to occur at normal speed while still enabling the data driver to achieve multiplied-speed driving after local decompression.
3Quantity of substance
If compressed image data is transferred instead of multiplied-speed drive image data, then data transfer amount is reduced, but additional compression/decompression processing is required
Solution Approach 1:
The patent merges the decompression function with the data driver's existing multiplied-speed driving function. This combination means that the decompression processing is integrated into the data driver's operational flow, minimizing additional complexity while achieving both data reduction and high-speed driving.
Solution Approach 2:
The data driver performs self-service by incorporating the decompression function within itself, eliminating the need for separate decompression hardware or complex external processing. This self-contained approach reduces system complexity while maintaining the benefits of compressed data transfer.
Data Source
AI summary
A display device is provided with: a display panel; a driver driving the display panel; and a controller adapted to perform multiplied-speed drive processing on original image data externally supplied thereto. The driver is adapted to drive the display panel by multiplied speed driving. When the driver performs the multiplied-speed driving, the controller generates multiplied-speed drive image data by performing the multiplied-speed drive processing on the original image data, generates compressed image data by compressing the multiplied-speed drive image data, and transfers the compressed image data to the driver. In this case, the driver decompresses the compressed image data to thereby reproduce the multiplied-speed drive image data, and drives the display panel in response to the reproduced multiplied-speed drive image data. When the driver does not perform the multiplied-speed driving, on the other hand, the controller transfers the original image data to the driver, and the driver drives the display panel in response to the original image data received from the controller.