Sharp Kabushiki Kaisha Corporation

Other

Takafumi Kawaguchi

Makoto Takeda

Toshihiro Yanagi

Taketoshi Nakano

Shiro Takeda

Akira Tomiyoshi

Hiroshi Take

Katsuya Mizukata

Keishi Nishikubo

Nobuyoshi Nagashima

Toshio Matsumoto

Shuhei Yasuda

Asahi Yamato

Hisao Okada

Ken Inada

Junji Kawanishi

Takahiro Yamamoto

A liquid crystal display device includes at least: a liquid crystal display panel; a light source provided on a back side of the liquid crystal display panel; and a frame accommodating the liquid crystal display panel and the light source and having an upper opening and a lower opening in an upper portion and a lower portion of the frame, respectively. The liquid crystal display panel includes a TFT substrate provided on a side of the light source, a CF substrate, a liquid crystal layer interposed between the TFT substrate and the CF substrate, a thin film driving circuit formed on the TFT substrate for driving the liquid crystal layer, and a front polarizing plate provided on a front surface of the CF substrate and having an overhanging portion overhanging from a periphery of the CF substrate. The front polarizing plate covers the upper opening of the frame and the overhanging portion is fixed to an upper end surface of the frame.

Liquid crystal display device

A display device includes a display panel including a bus line section; and at least one driver for driving the bus line section included in the display panel. Each of the at least one driver includes an amplifier for generating a non-driving signal based on an input signal, the non-driving signal not contributing to driving of the bus line section.

Display device and driver

A liquid crystal panel () is provided with a connection switching circuit () for connecting a video signal line driving circuit () to a plurality of video signal lines (Ls). The connection switching circuit () includes analog switches (SW) that correspond to the video signal lines (Ls) and one side of each of the analog switches (SW) is connected to one of the video signal lines (Ls). The video signal lines (Ls) are grouped together into groups of two video signal lines (Ls) that are spaced apart by one video signal line. The groups of video signal lines (Ls) respectively correspond to output terminals (TS) of the video signal line driving circuit (). The other sides of the analog switches (SW) connected to the video signal lines (Ls) of the same group are connected to one another, and connected to one output terminal (TS). Based on a switching control signal GS, the analog switches (SW) connect each of the output terminals (TS) in each horizontal scanning period by time division to the two video signal lines (Ls) of the corresponding group.

Display device and method for driving the same

A display apparatus of the present invention is provided with (i) a second memory for storing therein data of one frame for a whole display area of a display section, (ii) a first memory, provided in addition of the second memory, for storing therein data of one frame for a partial display area, (iii) a control section for causing the data respectively read out from the memories, to be respectively written in the display areas to which the data correspond to, and casing the partial display area to move to an predetermined position within a display screen of the display section, when a predetermined time lapses. The display apparatus has an improved display quality by moving the partial display area without affecting an image displayed in an area other than the partial display area.

Display apparatus and display method

A plurality of column electrode driving circuits is used in a matrix type display device including a plurality of row electrode driving circuits each for driving a plurality of row electrodes and the plurality of column electrode driving circuits each for driving a plurality of column electrodes. Each of the plurality of column electrode driving circuits includes a data input section for receiving a control data signal for the plurality of column electrodes; a timing control section for generating a timing control signal for controlling at least one of the row electrode driving circuit and the column electrode driving circuit; a selection section for selecting one of a signal in synchronization with the timing signal generated by the timing control section and the control data signal input to the data input section, based on the control data signal input to the data input section; and a data output section for outputting one of the signal in synchronization with the timing signal and the control data signal which is selected by the selection section. The data input section of a second column electrode driving circuit of the plurality of column electrode driving circuits is connected to the data output section of a first column electrode driving circuit of the plurality of column electrode driving circuits, and the data output section of the second column electrode driving circuit is connected to the data input section of a third column electrode driving circuit of the plurality of column electrode driving circuits.

Plurality of column electrode driving circuits and display device including the same

A liquid crystal panel having pixel-forming portions that are assigned dispersedly to two mutually adjacent rows of pixels sandwiching the scanning signal line Lg from above and below, in a horizontally periodical pattern having a cycle of 'up down, up' or 'down, up, down' as to which of the up row and the down row is selected in the assignment of three pixel electrodes. This staggered structure provides a quasi dot inversion driving method while reducing vertical shadow when displaying e.g. the &#x201c;checker back&#x201d;.

Liquid crystal display having a staggered structure pixel array

In a matrix display device, when cells of first to third colors composing one pixel are first to third cells, the second cell is disposed on one side of the first cell in a signal line alignment direction while disposing the third cell on the other side of the first cell in a scanning line alignment direction, and the first to third cells form the shape of a letter L. One pixel and another pixel adjacent to either side of the former pixel in the scanning line alignment direction are a first pixel in the shape of the letter L and a second pixel in the shape of the letter L and in a state rotating by 180&deg; with respect to the first pixel, respectively. The first and second pixels are paired with each other and a combination of these pixels form the shape of a square, where all the first pixels and all the second pixels respectively have the same combination of colors of the first to third cells, and the first and second pixels have a difference in disposition of colors, thus realizing high-definition display with a low-cost arrangement.

Matrix display device providing a larger connection pitch

A column electrode driving circuit for an image display device for selecting, from among a plurality of reference voltage levels, reference voltage levels respectively corresponding to gray scale levels in input data, and outputting the respective selected voltage levels to at least one data line. The input data includes data of a first color, a second color, and a third color. The reference voltage levels are independently selected corresponding to the gray scale levels in the input data of the first, second, and third colors. Among the reference voltage levels independently selected corresponding to a given gray scale level in the input data of the first, second, and third colors, the reference voltage level selected corresponding to at least one color is different from the reference voltage level or levels selected corresponding to the other color or colors, the given gray scale level being within a predetermined range. The reference voltage level selected corresponding to the given gray scale level in the input data of the at least one color is equal to a reference voltage level selected corresponding to another gray scale level in the input data of the other color or colors.

Column electrode driving circuit for use with image display device and image display device incorporating the same

A device for displaying a video signal which is supplied to the device along with a vertical synchronizing signal, includes a plurality of pixels arranged in a matrix, a switching element connected to each of the plurality of pixels, and a driving circuit for writing the video signal into each of the plurality of pixels via the switching element. The driving circuit writes the video signal to each of the plurality of pixels with a cycle TW shorter than one cycle of the vertical synchronizing signal.

In an active-matrix LCD device, a coupling signal in accordance with a sum of outputs of data signal lines is detected by a detection-use bus line crossing each of the data signal lines. The coupling signal is superimposed via a coupling capacitor on an input signal that serves as a reference, and is inverted and amplified by a inverting-amplifying section, then it is outputted as a common electrode signal. With this, a waveform that corresponds to a sum of the outputs is coupled with the common electrode signal. As a result, the common electrode signal is caused to have an influence that corresponds to a fluctuation of a potential of the common electrode due to outputs of the data signal lines and that is reverse in phase, thereby enabling to prevent horizontal shadow due to the outputs of the data signal lines. Thus, it is possible to realize an active-matrix-type LCD device in which horizontal shadow can be prevented with low power consumption.

Active-matrix-type liquid crystal display device, data signal line driving circuit, and liquid crystal display device driving method

An active matrix type display device according to the present invention includes: a display panel including a plurality of pixels arranged in a matrix shape, scanning lines connected to the plurality of pixels, and signal lines connected to the plurality of pixels; and a signal line driving circuit for receiving an analog video signal and driving each signal line with a signal line driving signal corresponding to a signal level of the analog video signal. The signal line driving circuit generates a pulse signal having a duty ratio corresponding to the signal level of the analog video signal and outputs the pulse signal.

Active matrix type display device and a method for driving the same

A method for driving a liquid crystal panel including a plurality of pixel electrodes arranged in a matrix, a plurality of data lines respectively connected to the pixel electrodes in a plurality of columns, a plurality of gate lines respectively connected to the pixel electrodes in a plurality of rows, and a plurality of switching devices, respectively connected to the pixel electrodes, for connecting and disconnecting the corresponding pixel electrode and the corresponding data line based on a signal sent from the corresponding gate line. The method includes the step of applying a driving voltage having a waveform corresponding to image data used for display to each data line while inverting the driving voltage gate line by gate line and frame by frame, so as to maintain an average value of the driving voltage in each frame within a certain range.

Method and circuit for driving liquid crystal panel

A gray scale signal duty ratio conversion section employs D flip-flops and AND gates so as to generate detection pulses for rises and falls of the gray scale signal T based on the gray scale signal T input from the control circuit and the clock signal CKT. Among the rise-detection pulses and fall-detection pulses, only the fall-detection pulses are delayed by the D flip-flop by one clock, and the delayed fall-detection pulses and the rise-detection pulses are input to an RS flip-flop so that the altered gray scale signal T' is obtained as an output of the RS flip-flop. The altered gray scale signal T' thus obtained is a signal whose HIGH period is longer than the input gray scale T by one clock. Thus, it is possible to compensate for the phenomenon associated with a TFT liquid crystal display device driven by the gray-scale driving method where a voltage applied to a liquid crystal capacitance may vary with the turning off of the TFT is from the voltage it was charged with. As a result, the liquid crystal material is prevented from being deteriorated, whereby the display quality and the reliability of the liquid crystal display device are improved.

Liquid crystal display method and apparatus for controlling gray scale

There is provided an information display device in which speed of detecting input coordinates on a display screen is increased. A coordinate detection circuit 7 detects indication coordinates at a tip end of an electronic pen 6 based on an induction voltage induced at a detection electrode of the electronic pen 6 in scanning a row electrode G and a column electrode S. A coordinate output circuit 17 obtains indication coordinates at the tip end of the electronic pen 6 based on a movement amount detection signal from a movement amount detecting section 20 of the electronic pen 6. A coordinate signal generating circuit 18 outputs an x-coordinate signal and a y-coordinate signal by combining the indication coordinates detected by the coordinate detection circuit 7 and the indication coordinates obtained by the coordinate output circuit 17. Thus by filling an interval between the indication coordinates detected by the coordinate detection circuit 7 with indication coordinates obtained by the coordinate output circuit 17, an apparent detection speed of the input coordinates can be increased.

Growing community of inventors

Taki-gun, Japan

Takafumi Kawaguchi