International Business Machines Corporation

Satoru Nishi

Yasuhiro Kimura

Takahiro Onodera

Hiroshi Yamashita

Makoto Tanibayashi

Mikio Kurihara

Toshihiko Yoshida

Takashi Yonezawa

Yamato Kamaya

Kazunari Kushima

Hiroshi Yoshikawa

A method and associated system for estimating a position of an object. A radio wave is received from each radio frequency identification (RFID) tag of N RFID tags affixed to the object at different positions at the object (N&#x2267;2). A position of each RFID tag is detected from the received radio waves. A position of each RFID tag is estimated from analysis of the detected positions. The estimating includes utilizing, for n=1, 2, . . . , N, a specified probability function P('p|p) denoting a probability that the estimated position of RFID tag n is &#x2032;pif the detected position of RFID tag n is p, wherein &#x2032;pand pare vectors from an origin of a coordinate system to the detected position and the estimated position, respectively, of the RFID tag n. The position of the object is ascertained from analysis of the estimated positions.

Detection of a position of an object

To reduce both frequency of the source driver and the capacity of memory used for this purpose. An apparatus for supplying data to a plurality of source drivers classified into a plurality of groups each of the source drivers driving a part of a LCD panel, comprising: a plurality of memory blocks, each block supplying data to one of the groups of the source driver and allowing itself to be read out and be written into simultaneously; control circuits for switching the memory blocks to be written when data of pixels drawn by one source driver when one line in the LCD panel is drawn written from the frame buffer into one memory block; and wherein while writing data into the memory block, the written data is read from the memory block at a lower speed than the writing, simultaneously.

Memory controller for liquid crystal display panel

In order to display an image on a liquid crystal display at a constant image quality independently of a change of the length of the period for applying voltages with the same polarity to the liquid crystal, the length of one cycle of a horizontal synchronizing signal inputted to an LCD unit from an information processor is counted and the amplitude of data voltage and the center of the amplitude are corrected so that the amplitude of the data voltage to be applied to the liquid crystal increases and a correction value for the center of the amplitude increases as the length of the period for applying data voltages with the same polarity to the liquid crystal decreases in accordance with the length of one cycle of the horizontal synchronizing signal and whether to perform gate overlap scan. Thereby, the absolute values (V) of inter-electrode voltages after the TFT is turned off are equalized independently of the polarity of data voltage to be applied to the liquid crystal both for a relatively long period and for a relatively short period.

Correction of LCD drive voltage in dependence upon LCD switching element

The generation of flicker is prevented when the contrast of a displayed image is changed. The amplitude of the data voltage whose polarity is inverted at a timing synchronized with the display cycle of an image is changed based on the tone and the designed contrast. At the same time, the position (center) of 0 V relative to the amplitude of the data voltage is offset a larger amount as the contrast increases. This corrects a change V in voltage between the electrodes under the influence of the parasitic capacity of a TFT when the TFT is turned off, so that the voltage between the electrodes is also turned off despite the polarity of the data voltage applied to the liquid crystal, even when the designated contrast is relatively high and the amplitude of the data voltage is relatively small, and even when the designated contrast is relatively low and the amplitude of the data voltage is relatively large.

Method and apparatus for driving a liquid crystal display

In a printed circuit board for a liquid crystal display using Tape Automated Bonding (TAB) for making interconnections, flow of molten solder to adjacent input electrodes on the TAB is prevented as well as short-circuiting between electrodes and wire breakage by using an improved TAB structure that avoids applying a concentration of shearing stress to the input electrodes and retards short-circuiting solder flow. This is accomplished by making the width of the slit for the input electrodes uneven. The width of the slit where each of the electrodes crosses over the slit is narrower than elsewhere.

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Zama, Japan

Satoru Nishi