Myson Technology Inc.

Holtek Semiconductor Corp.

Myson Century, Inc.

Jen-Chung Weng

Tung-Hai Wu

Tsung-yi Tseng

Jia-der Hsieh

Jar-Lin Chen

Wei-chen Sue

Kuei-hsiang Chen

An image-clock adjusting circuit is provided and includes a phase comparator, a clock controller, and a timing generator. The phase comparator receives a power source signal and a vertical synchronous signal and compares a phase of the power source signal with that of the first vertical synchronous signal for producing at least a phase comparison signal. The clock controller receives the phase comparison signal and the vertical synchronous signal, produces a pixel clock signal and intermittently adjusts a clock width of the pixel clock signal. The timing generator receives the pixel clock signal and adjusts the vertical synchronous signal into an adjusted vertical synchronous signal being nearly in phase with the power source signal. Therefore, The effect suppressing the phenomenon of the color rolling with the simpler circuit is accomplished.

Image-clock adjusting circuit and method

A method and apparatus is provided for interpolating a digital image in response to a requested degree of sharpness. An adjusting signal representing the requested degree of sharpness will then be generated. The interpolated pixel data are computed based on a 3 order or 4 order interpolation function for three sampling input pixels with an adjustable weight coefficient representing the selected degree of sharpness. The apparatus of the present invention mainly includes: a control interface, a control unit, a vertical interpolation computation module, and a horizontal interpolation module. The vertical interpolation computation module and the horizontal interpolation module are implemented according to an interpolation function derived by the present invention. The control unit comprises a lookup table built according to a scaling function of the present invention. The vertical scaling factor and the horizontal scaling factor required for the interpolation function can be obtained by looking up the lookup table according to the adjusting signal, and the position of the interpolated pixel. Accordingly, the present invention can control the degree of sharpness without having to implement an additional sharp control circuit.

Method and apparatus for interpolating a digital image

Method for automatically adjusting sampling phase of LCD control system

An image dithering device processing in both time domain and space domain to improve the image quality of an LCD digital display is disclosed. The device comprises a Gamma Table for performing Gamma processing on input signals; a counter module for generating a row counting value and a column counting value by counting the vertical synchronizing signal, horizontal synchronizing signal, and image pixel clock of the LCD image control system; a dithering value generating module for providing a dithering value for each pixel according to the row counting value and the column counting value, the dithering value generating module having a matrix with different value; and a calculation module for performing calculation on the value output form the Gamma Table and the dithering value for decreasing the bits of the input image value so as to fit the input data bits of the LCD display. Since the abandoned lower bite data are expressed in terms of time domain, the image quality and color of the LCD digital display can be increased.

Image dithering device processing in both time domain and space domain

A method and apparatus is provided for interpolating a digital image in response to a requested degree of sharpness. An adjusting signal representing the requested degree of sharpness will then be generated. The interpolated pixel data are computed based on a two-order interpolation function for two sampling input pixels with an adjustable weight coefficient representing the selected degree of sharpness. The apparatus of the present invention mainly includes: a control interface, a control unit, a vertical interpolation computation module, and a horizontal interpolation module. The vertical interpolation computation module and the horizontal interpolation module are implemented according to an interpolation function derived by the present invention. The control unit comprises a lookup table built according to a scaling function of the present invention. The vertical scaling factor and the horizontal scaling factor required for the interpolation function can be obtained by looking up the lookup table according to the adjusting signal, and the position of the interpolated pixel. Accordingly, the present invention can control the degree of sharpness without having to implement an additional sharp control circuit.

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Hsinchu, Taiwan

Jen-Chung Weng