Chunghwa Picture Tubes, Ltd.

Chunghwa Tubes, Ltd.

Shiuh-Bin Kao

Kuang-Lang Chen

Ching-Hui Lin

Yi-Sheng Yu

Yao-Hung Lai

Liang-Kuei Hsu

Sheng-Chi Lee

Sheng-Wen Hsu

A process of effecting various anti compensation processes on input image on a plasma display panel comprises the steps of a) performing a gamma (i.e., &#x3b3; equal to 0.45) compensation process on a video signal received by the PDP with respect to a &#x3b3;; b) dividing the video signal into at least two segments based on a gray level thereof; and c) performing a variety of anti compensation processes on the video signal in respective segment. A smaller &#x3b3; is used in the anti compensation process with respect to the video signal in a range of low gray level for increasing the gray level in the range of low gray level. Similarly, a larger &#x3b3; is used in the anti compensation process with respect to the video signal in a range of high gray level for increasing a gradient in the range of high gray level, thereby obtaining a sharp image contrast, improving image quality, and rendering an enhanced image brightness.

Method of effecting various anti compensation processes on segmented gray level of input image on plasma display panel

A method for implementing error diffusion on a plasma display panel (PDP) comprises the steps of performing an anti compensation process on a received video signal of the PDP; diffusing an error generated by a first one of a plurality of pixels to a plurality of adjacent pixels; absorbing errors generated by the plurality of adjacent pixels by the first pixel; and multiplying each of a plurality of numeric weightings and the error of each of the adjacent pixels to obtain an error function of the first pixel. This is effected in a cost effective while simple addition circuit for solving the problem of low level contouring in PDP due to insufficient gray scale of video signal in low gray scale.

Method for implementing error diffusion on plasma display panel

A compensation process for improving color saturation and image quality of a plasma display panel (PDP) is provided, wherein a brightness of light generated from each of red, green, and blue discharge cells of each pixel on said PDP is calculated through a numeric operation according to laws of color matching. The process comprises the step of increasing or decreasing the strength of input image signals of each of the red, green, and blue discharge cells in accordance with the calculation result for adjusting brightness of the generated red, green, and blue lights so as to subtract a visible light generated by gas in each of the red, green, and blue discharge cells during gas discharging, thereby eliminating an adverse effect of the visible light on color purity and color temperature of the PDP during gas discharging. This can obtain an image on PDP having an optimum color purity and color temperature and reduce the manufacturing cost.

Compensation method for improving color purity and color temperature of plasma display panel by adjusting the strength of input image signals

In an alternating current discharge type plasma display panel (PDP) a plurality of parallel barrier walls are formed on a top surface of a back substrate of the PDP and barrier walls are disposed corresponding to cross-points of X electrodes and Y electrodes on a front substrate of the PDP. A structure includes a plurality of discharge cells between the adjacent barrier walls having smaller width corresponding to the X and Y electrodes for forming a large first space, a plurality of non-discharge cells each between the adjacent discharge cells for forming a small second space served as a gas channel between the adjacent discharge cells, and a junction between one discharge cell and the adjacent non-discharge cell, such that energy released from a gas discharge in the discharge cells is concentrated within the discharge cells for increasing discharge efficiency.

Discharge cells between barrier walls of alternating current discharge type plasma display panel

A front panel for AC plasma display panel made by: using exposure and sand blast techniques to form horizontally spaced lines of induction layer above an inner side of a glass substrate, and then making X-electrodes and Y-electrodes on the glass substrate, enabling X-electrodes and Y-electrodes to be alternatively disposed and horizontally spaced between each two adjacent lines of induction layer, and then printing a protective layer over the electrodes, enabling a straight line of discharge path to be formed between each X-electrode and Y-electrode, so that the service life of the plasma display panel can be prolonged, the intensity of electric field and UV light can be greatly improved, and the value of driving voltage can be effectively reduced.

Method of fabricating a front substrate for AC plasma display panel

A dynamic color temperature and color deviation calibration method is provided for eliminating problems associated with color temperature change and color deviation caused by an emissivity change of red, green and blue phosphor layers of a plasma display panel (PDP). The method comprises the steps of utilizing laws of color matching for calculating an emissivity change of a pixel of the PDP in response to a brightness change of one of red, green, and blue lights emitted by a corresponding one of red, green and blue discharge cells of the PDP through a numeric operation; dynamically adjusting brightness of one of the emitted red, green, and blue lights by increasing or decreasing strength of input video signal of each of the discharge cells; and eliminating a color temperature and a color deviation of the PDP due to an emissivity change. This can render an image having an optimum color purity and color temperature by eliminating adverse effects on PDP due to emissivity change.

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Taipei, Taiwan

Shiuh-Bin Kao