Acceptable limits of gamma for a TFT-liquid crystal display on subjective evaluation of picture quality

Shimodaira, Yoshifumi; Muraoka, Takahiro; Mizushina, S.; Washio, Hajime; Yamane, Yu; Awane, K.

doi:10.1109/30.468031

Cited by 8 publications

(5 citation statements)

References 3 publications

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“…The highest evaluation was recorded at a measured gamma value of 1.13. [16] Lee et al, have also developed a circuit for gamma correction for the TFT LCD. Instead of using non-linear DAC architecture, they have explored a linear architecture which used a reduced number of resistors.…”

Section: Gammamentioning

confidence: 98%

“…The look-up tables for the LCDs are used to impose the gamma curve on the display because the LCDs native gamma is not well behaved and does not produce the luminance values close to the model. Therefore to improve the gamma presentation of the LCDs, many researchers have developed methods to impose a gamma curve onto the output of LCDs [16], [18], [20].…”

Section: Crt Measurement Relationship To the Flat Panel (Lcd)mentioning

confidence: 99%

“…The non-linearity of the CRT gamma function is due to a complex interaction of monitor electronics, phosphor response, electron gun dynamics, shadow masking, and other factors. Many researchers have studied displays and have developed methods to compute and correct for gamma [14] [15] [16] [17] [18].…”

Section: Gammamentioning

confidence: 99%

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Characterizing a high resolution color display performance using a Prichard photometer

et al. 2015

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Measuring the performance of a cathode ray tube (CRT) or liquid crystal display (LCD) is necessary to enable endto-end system modeling and characterization of currently used high performance analog imaging systems, such as 2nd Generation FLIR systems. If the display is color, the performance measurements are made more difficult because of the underlying structure of the color pixel as compared to a monochrome pixel. Out of the various characteristics of interest, we focus on determining the gamma value of a display. Gamma quantifies the non-linear response between the input gray scale and the displayed luminance. If the displayed image can be corrected for the display's gamma, an accurate scene can be presented or characterized for laboratory measurements such as MRT (Minimum Resolvable Temperature) and CTF (Contrast Threshold Function). In this paper, we present a method to determine the gamma to characterize a color display using the Prichard 1980A photometer. Gamma corrections were applied to the test images for validating the accuracy of the computed gamma value. The method presented here is a simple one easily implemented employing a Prichard photometer.

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Section: Gammamentioning

confidence: 98%

Section: Crt Measurement Relationship To the Flat Panel (Lcd)mentioning

confidence: 99%

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Characterizing a high resolution color display performance using a Prichard photometer

et al. 2015

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“…Although this results in the merit of making the circuit scale smaller, it also increases the nonlinear characteristics of quantization. Nonetheless, as the γ characteristics of a liquid crystal display [20] and Weber's Law expressed by Eq. (6) show, it is well known that the darker the signals are, the larger the recognizable gradation difference ΔV I of the human perception V I is.…”

Section: Process Threshold Valuesmentioning

confidence: 99%

Study of Reducing Circuit Scale Associated with Bit Depth Expansion Using Predictive Gradation Detection Algorithm

Nagase

Nakano

Asamura

et al. 2014

IEICE Trans. Inf. & Syst.

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SUMMARYThe authors have evaluated a method of expanding the bit depth of image signals called SGRAD, which requires fewer calculations, while degrading the sharpness of images less. Where noise is superimposed on image signals, the conventional method for obtaining high bit depth sometimes incorrectly detects the contours of images, making it unable to sufficiently correct the gradation. Requiring many line memories is also an issue with the conventional method when applying the process to vertical gradation. As a solution to this particular issue, SGRAD improves the method of detecting contours with transiting gradation to effectively correct the gradation of image signals which noise is superimposed on. In addition, the use of a prediction algorithm for detecting gradation reduces the scale of the circuit with less correction of the vertical gradation.

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“…Conventional OD technology requires several lookup tables (LUTs) and interpolation logics. [5][6][7][8][9][10] The LUTs are usually extracted at a fixed temperature, such as room temperature; thus, LCDs are forced to use the fixed OD values regardless of their ambient temperatures. However, applying adequate OD values to the panel depending on ambient temperatures is necessary to maintain optimized moving picture characteristics anywhere and anytime.…”

Section: Introductionmentioning

confidence: 99%

Overdrive technology compensating for ambient temperature

Kim

Lee

et al. 2015

Opt. Eng

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Abstract. We propose an overdrive (OD) technology to precisely compensate for the temperature-dependent response characteristics of liquid-crystal displays (LCDs). The optical responses of LCDs are highly dependent on ambient temperature. After analyzing the optimized OD values, the new OD technology uses simple calculation logic instead of bulky OD lookup tables to obtain OD values of rising transitions over a wide range of ambient temperatures. We also show that it is possible to automatically adjust the optimum OD values depending on the ambient temperature. The results show that the proposed OD technology can improve motion image quality without any motion artifacts regardless of the ambient temperature. We expect that our proposed OD technology will ensure that LCD products have a consistent motion image quality regardless of the ambient temperature without any increase in cost.

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Acceptable limits of gamma for a TFT-liquid crystal display on subjective evaluation of picture quality

Cited by 8 publications

References 3 publications

Characterizing a high resolution color display performance using a Prichard photometer

Characterizing a high resolution color display performance using a Prichard photometer

Study of Reducing Circuit Scale Associated with Bit Depth Expansion Using Predictive Gradation Detection Algorithm

Overdrive technology compensating for ambient temperature

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