48‐2: A new LCD‐Controller for Improvement of Response Time by Compression FFD

Someya, Jun; Okuda, Noritaka; Yoshii, H.; Yasugi, Masaki; Oura, H.; Minami, Akihiro; Tachibana, Hiroshi

doi:10.1889/1.1832535

Cited by 18 publications

(12 citation statements)

References 8 publications

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“…It is desired to reduce the cost of the system by compressing the data stored in the DRAM as in [6] and [7]. The errors in the decompressed image cause the errors in the amount of overdriving correction and have an effect on the reduction of motion blur.…”

Section: Fig 2 Block Diagram Of Overdrivementioning

confidence: 99%

A Hybrid Image Coding in Overdriving for Motion Blur Reduction in LCD

Wang¹,

Min²,

Chong³

2007

Entertainment Computing – ICEC 2007

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Abstract.Overdriving technique enlarges the desired change of the pixel value，the error in general compression methods is enlarged at the same time. Therefore ， we propose a novel Adaptive Quantization Coding (AQC) to reduce the error in compression for overdriving technique reducing motion blur. Considering hardware implementation, we develop a hybrid image coding which uses color transform first, and then uses AQC to compress luminance data as well as Block Truncation Coding (BTC) to compress chrominance data. The simulation results shown that the average PSNR was improved 5.676dB as compared with the result of BTC, and the average SD of error was reduced 50.2% than that in the BTC. The proposed algorithm is implemented with the verilog HDL and synthesized with the synopsys design compiler using 0.13μm Samsung Library.

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Section: Fig 2 Block Diagram Of Overdrivementioning

confidence: 99%

A Hybrid Image Coding in Overdriving for Motion Blur Reduction in LCD

Wang¹,

Min²,

Chong³

2007

Entertainment Computing – ICEC 2007

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“…[10][11][12][13][14][15][16][17] Recent efforts have been focusing on how to reduce hardware cost to implement overdrive technology. [17][18][19][20][21][22] A conventional OD technology has bottlenecks to implement it in products. It requires a complex circuit to implement and demands accurate OD values for good performance.…”

Section: Introductionmentioning

confidence: 99%

New overdrive technology for liquid-crystal displays with a simple architecture

et al. 2010

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We propose a new technique to extract overdrive ͑OD͒ values that are indispensable to improve response characteristics of liquidcrystal displays. We show the relation among an OD value ͑D OD ͒, a previous frame data ͑D PF ͒, and a current frame data ͑D CF ͒ can be expressed very well by a third-order polynomial. To make the implementation of the OD technology to be simple, we propose to create a base line that is expressed by the third-order equation and to linearly shift it according to D PF . Our proposed method does not need the large size lookup tables ͑LUTs͒, whereas the conventional OD technology requests huge LUTs. Thus, our method can be easily implemented by very small circuits, which enables a low-cost solution. Only six measurements in our method are sufficient to obtain OD values of all the transition, whereas the conventional one wants 256 measurements. We investigate the best position of the base line and show how small the deviation from optimum values is. We prove that the proposed OD technology enables a low-cost implementation, high productivity, and high performance.

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“…Overdriving technologies require an external synchronous dynamic random access memory (SDRAM) to store at least one frame data for signal processing. Since the amount of data increases proportionally to the resolution and to the number of frames to be stored, LCD controllers that perform overdriving technologies often include image compression to reduce the amount of data and thereby the size of the external SDRAM [2]. Block truncation coding (BTC) algorithms are usually used as the image compression algorithm in such LCD controllers because of their simple implementation.…”

Section: Introductionmentioning

confidence: 99%

“…Block truncation coding (BTC) algorithms are usually used as the image compression algorithm in such LCD controllers because of their simple implementation. As a result, a 16 Mbit SDRAM is used as the external memory to store the frame data [2].…”

Section: Introductionmentioning

confidence: 99%

“…The problem with this is that the compression ratio of BTC is limited to a low efficiency ratio [3]. Previous work reported an average peak signal-to-noise ratio (PSNR) of 38.8 dB at a 3:1 compression ratio [2]. Considering the general expectation for acceptable images, which is 35 dB [4], it is hard to increase the compression ratio using BTC.…”

Section: Introductionmentioning

confidence: 99%

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