Sharp Kabushiki Kaisha Corporation

Akira Tomiyoshi

Takafumi Kawaguchi

Naoto Inoue

Makoto Takeda

Tomohiko Yamamoto

Masayuki Takahashi

Osamu Teranuma

Shinji Suminoe

Aya Nakatani

By a simple circuit configuration, luminance unevenness is suppressed, and charge remaining after a power source supply is interrupted is suppressed. A slope control unit () generates a switch control signal (Von) having a waveform with a falling slope, by switching between a grounded state of being connected to a ground and an ungrounded state, and modulating the waveform of a high voltage (VGH), and in a case where a power supply from the outside is interrupted, the slope control unit () is in the ungrounded state.

Display apparatus with waveform adjuster generating switch control signal by switching between grounded state and ungrounded state

Disclosed is a liquid crystal display device wherein display performance of a two-dimensional image and that of a three-dimensional image are both improved. The liquid crystal display device is provided with: a liquid crystal display panel, which displays the two-dimensional image and the three-dimensional image by selectively switching the images; and a backlight, which supplies light to the liquid crystal display panel. The backlight includes an illuminating region, which is scan-lighted corresponding to scanning of the liquid crystal display panel, and the scanning frequencies of the illuminating region at the time of displaying the two-dimensional image and the three-dimensional image on the liquid crystal display panel are different from each other.

Liquid crystal display device and television receiver

An LED backlight in which deterioration in in-plane uniformity of brightness is prevented, whose thickness, frame width, and wire length are reduced, and in which wiring can be carried out easily, includes an LED provided on one surface of an LED substrate; the LED substrate is mounted on a chassis panel so that a surface of the LED substrate opposite to the one surface contacts the chassis panel; and the chassis panel has a connection hole provided in a portion of a region of the chassis panel in which region the LED substrate is mounted, which passes through the chassis panel.

LED backlight and liquid crystal display device

An illumination device () includes a light-emitting diode (light-emitting element) () and an LED substrate (light source substrate) () including a mounting surface () on which the light-emitting diode () is mounted. A plurality of the light-emitting diodes () are mounted on the mounting surface () of the LED substrate () and an LED driver (driving circuit element) () for driving the light-emitting diodes () is provided on the backside () of the mounting surface ().

Illumination device and display device using the same

A light source device having light guide elements (to) and light emitting elements (to) for supplying light to each of the light guide elements. The light guide elements each has a wedge-like shape whose thickness is reduced from one end to the other end. The light guide elements are tandem arranged such that the thinner end of a light guide element lies over the thicker end of the other light guide element. Each light guide element has holding sections recessed in the width direction (toto) in its thicker end on which the other light guide element lies. In the light guide device in which the wedge shaped light guide elements are tandem arranged, positional displacement between light guide elements is prevented.

Light source with overlapping light guide elements for liquid crystal display device

An LED backlight in which deterioration in in-plane uniformity of brightness is prevented, whose thickness, frame width, and wire length are reduced, and in which wiring can be carried out easily, includes an LED provided on one surface of an LED substrates; the LED substrate is mounted on a chassis panel so that a surface of the LED substrate opposite to the one surface contacts the chassis panel; and the chassis panel has a connection hole provided in a portion of a region of the chassis panel in which region the LED substrate is mounted, which passes through the chassis panel.

An illumination device includes an LED package, an LED driver including an FET, and a thermistor disposed on a substrate. A plurality of such LED packages are disposed on the substrate such that a first area and a second area, each determined by vertices corresponding to LED packages, are defined on the substrate. The thermistor is disposed in the first area, and the FET is disposed in the second area, which is outside of the first area. The thermistor detects a temperature in the first area. Such a configuration allows the thermistor to detect, in accordance with the temperature in the area, the temperature of heat transferred from the LED packages, without being affected by heat generated by the FET. This makes it possible to efficiently make temperature corrections to stabilize color temperature and luminance.

Illumination device and liquid crystal display device

The present invention relates to a display that uses a polysilicon liquid crystal panel. An object of the present invention is to sufficiently secure a hold period and a setup period upon a rise of a source start pulse signal (SSP) without increasing power consumption or increasing circuit scale. A display control circuit () includes a source start pulse signal generating circuit () that generates a source start pulse signal (SSP); and a source shift clock signal generating circuit () that generates a source shift clock signal (SCK). The source shift clock signal generating circuit () shortens a period during which the source shift clock signal (SCK) is maintained at a high level, only during a period of time which is immediately before the source start pulse signal (SSP) rises in each horizontal scanning period, based on a source shift clock modification command signal (K) to be outputted from the source start pulse signal generating circuit ().

Display, drive circuit of display, and method of driving display

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.

Information display device capable of increasing detection speed and

The active matrix type display apparatus of this invention includes a display medium made of an electro-optical material; a pair of substrates opposing each other with the display medium interposed therebetween; a plurality of pixel electrodes formed in a matrix on one of the substrates; a plurality of row electrodes; a plurality of column electrodes; switching devices each of which is disposed so as to correspond to each of the pixel electrodes, connects the corresponding pixel electrode to the column electrode corresponding to the pixel electrode, and is connected to the row electrode corresponding to the pixel electrode through a control terminal thereof; a row electrode driving circuit for applying a voltage to each of the row electrodes so that the corresponding switching device become conductive only in a row electrode scanning term during a horizontal scanning term assigned to each of the row electrodes; a column electrode driving circuit for alternately applying two kinds of voltages to each of the column electrodes repeatedly at a duty ratio in accordance with a display data corresponding to each of the column electrodes; and voltage switching inhibition element for inhibiting switching of the voltages to be applied to each of the column electrodes by the column electrode driving circuit at least in part of a horizontal scanning term that is not assigned as the row electrode scanning term of any of the row electrodes.

Display apparatus

A switching circuit selects a display control circuit in an image display period, and selects a detection control circuit in an x-coordinate detection period. A row electrode drive circuit outputs row electrode scanning pulses in the image display period to sequentially scan row electrodes. A column electrode drive circuit outputs column electrode scanning pulses in the x-coordinate detection period to sequentially scan column electrodes. A coordinate detection circuit detects coordinates at a tip end of a detection pen based on an induction voltage induced at a tip electrode of the detection pen due to the scanning pulses. Accordingly, by detecting a y-coordinate at the tip end of the electronic pen in the image display period and detecting the x-coordinate in the x-coordinate detection period, a display-integrated type tablet device can achieve an increase in area of its display screen, high productivity, cost reduction, and high coordinate detection accuracy.

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Osaka, Japan

Akira Tomiyoshi