Vastview Technology Inc.

Industrial Technology Research Institute

Chang-Cheng Lin

Yuh-Ren Shen

Yu-Lin Lee

Jan-Ruei Lin

Cheng-Chung Peng

Ming-Daw Chen

Chang-Ho Liou

Yuhren Shen

Cheng-Jung Chen

Hung-Chi Chu

Liang-Chen Chien

Chih-Hao Wu

Jun-Ren Shin

An apparatus for driving LEDs using high voltage includes a plurality of LEDs divided into a plurality of LED segments connected in series and a plurality of three-terminal voltage controlled current limiting devices. Each of the current limiting devices is associated with one of the LED segments and has a first terminal connected to a negative end of the associated LED segment, a second terminal applied with a bias voltage and a third terminal connected to a common node. A current source is connected between the common node and ground. A power-loss reduction circuit having a plurality of LEDs controlled by an LED controlling circuit may further be inserted between the common node and the current source to reduce the power loss in the current source because of the high voltage at the common node.

Apparatus for driving LEDs using high voltage

A dynamic control method for controlling backlight module of liquid crystal display (LCD) comprises steps of: receiving a frame data which is transferred to the LCD and consists a plurality of raw grayscale level; processing a statistical analysis for distribution of the plurality of raw grayscale level; and transferring a plurality of corrected grayscale level which is resulted from the statistical analysis corresponding to the raw grayscale level to the backlight control unit and a data modification simultaneously, wherein the backlight control unit uses the plurality of corrected grayscale level to modify brightness of backlight module and the data modification uses the plurality of corrected grayscale level to compare with the plurality of raw grayscale level for accurate display performance, so that the electrical power consumption is reduced and image quality is enhanced.

Driving method of liquid crystal display device having dynamic backlight control unit

An overdrive accuracy adjustment device and method for use in a liquid crystal display panel is presented. According to a current grayscale value of a pixel in an awaiting to be displayed image and a previous grayscale value of the corresponding pixel in an already-displayed image, the corresponding overdrive grayscale value is found from a look-up table. In order to more efficiently use the limited storage capacity of the look-up table as well as improve the accuracy of the overdrive, in accordance with the physical characteristics of the liquid crystal display panel in particular (in particular to the grayscale values which often require the overdrive), the gap size between the current grayscale values and/or the gap size between the previous grayscale values may be adjusted in the look-up table, without having to increase the quantity of the overdrive grayscale values stored in the look-up table.

Liquid crystal display overdrive accuracy adjustment device and method

A double-frame-rate method for reducing the time lapse of a LCD pixel between its two consecutive scans within a frame is provided. The method horizontally partitions the scan lines into (k) non-overlapping regions, each containing m, m, . . . , mscan lines. The method then scans each of the regions twice before continuing to the next region and, as such, completes two passes of scanning of the entire frame. For a pixel in a region (j), the time lapse between the pixel's two consecutive scans during the frame's frame time is (m/n) of the time lapse of conventional double-frame-rate methods.

Method for reducing time lapse of consecutive scan of LCD pixel

The method increases the output frame rate to p/q (p, q are both natural numbers and p&#x3e;q) times of the input frame rate. In a period of time equal to the least common multiple of the input and output frame times, q input frames are output and (p&#x2212;q) transient frames are generated and inserted at appropriate places before or after the q input frames in the output frame sequence so as to enhance the dynamic display effect of the display device.

Method for enhancing response speed of hold-typed display device

A driving method for LCD panels is disclosed, wherein the driver circuit includes multiple data line drivers and at least two gate line drivers, and the first gate line driver produces a normal image with sequential line scanning starting from the beginning of a frame, and the second gate line driver produces a dimmed image starting from a predetermined number of lines below at the same time to emulate one full sweep across a CRT. Therefore, a dimmed image is inserted into every digitized image, where a dimmed image is defined to be a digitized image with each pixel having a fraction 1/N of the original pixel value. The LCD panel drive using this driving method achieves performance closer to the impulse approach used in CRT displays, and the flickering phenomenon can be significantly rectified.

Driving method for LCD panel

A shift-register circuit. The shift-register circuit has a plurality of shift-register units connected in series. Each of the shift-register units generates first and second pulse signals, wherein the first pulse signal is an output signal of the shift-register circuit and the second pulse signal is a trigger signal of a subsequent shift-register unit. A LCD panel driving circuit using the shift-register circuit is also disclosed.

Shift-register circuit

The present invention relates a time-sharing multiplexing driving method and framework for image signals. By means of a plurality of wiring paths, the turned-on orders of the signal switches of the pixel units in a liquid crystal panel (LCD) are sequentially controlled so that the pixel units of two adjacent phases in the panel can have the same turned-on order. This not only can avoid the situation where the switch control signal serial connecting path in the panel is so long that the control signal of the end switch will be seriously distorted for the excessively great load, but also make the variation amounts of the adjacent pixel data voltages the same. Therefore, the objective of the invention can be achieved. Namely, no joint space is generated during the image signal time-sharing multiplexing driving.

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Taipei, Taiwan

Chang-Cheng Lin