Sanyo Electric Co., Ltd.

Masahiro Okuyama

Naoaki Komiya

Shoichiro Matsumoto

Hisao Uehara

Makoto Shimizu

Koji Hirosawa

Norio Miura

Atsuyoshi Tanioka

Kazuhiko Moriwaki

Michiru Senda

Ryoichi Yokoyama

Tsutomu Yamada

Masayuki Koga

Isao Akima

A display allowing further miniaturization when including a plurality of display panels is obtained. This display comprises a first display panel formed on a substrate and a second display panel formed on the same substrate on a region different from that formed with the first display panel. Thus, the display can be further miniaturized as compared with that having a first display panel and a second display panel formed on different substrates.

Display including a plurality of display panels

An active matrix type electroluminescence display device is provided which comprises a plurality of display pixels GS, GS, GS, arranged in a matrix of rows and columns; gate signal lines GL, GL, Gli connected to and shared by a plurality of display pixels arranged in each row; and gate drive circuits for sequentially supplying a select signal SCAN to the gate signal lines GL, GL, GL, Gli. Each display pixel includes an electroluminescence element, a first thin film transistor in which a display signal DATA is applied to the drain and which is switched on and off in response to the select signal SCAN, and a second thin film transistor for driving the EL element based on the display signal DATA. The gate drive circuits are placed so that each of the gate signal lines GL, GL, GL, Gli is driven from both ends.

Active matrix type electroluminescence display device

An active matrix type electroluminescence display device comprises a plurality of display pixels GS, GS, GS, etc. arranged in a matrix of rows and columns, each display pixel including an EL element, a first thin film transistor in which a display signal is applied to the drain and which is switched on and off in response to a select signal, a capacitance with one end connected to the source of the first thin film transistor for maintaining a voltage corresponding to the display signal, and a second thin film transistor for driving the EL element based on the display signal. The other ends of the capacitance of row display pixels are connected to and shared by a plurality of first capacitance lines HLA, HLA, HLA, HLAi. Both ends of the plurality of first capacitance lines HLA, HLA, HLAare connected to and shared by second capacitance lines HLBand HLB. A constant voltage is supplied to the second capacitance line.

A low power-consumption active matrix display device including gate lines, drain lines, and pixel electrodes, which are arranged at intersections between the gate lines and the drain lines. A drain line driver is connected to the drain lines to select a drain line and provide the selected drain line with an image signal. A gate line driver is connected to the gate lines to select a predetermined gate line and provide the selected gate line with a gate signal. Level shifters are connected to the drain line driver to operate in a time-dividing manner. Each level shifter supplies the drain line driver with a boosted voltage.

Active matrix display device

An insulator substrate () is provided with a display pixel region () comprising an electroluminescence element () having a cathode (), emissive layer (), and anode (), and with first and second TFTs for driving the element. Surrounding the display pixel region (), a peripheral drive circuit region () having a third TFT for driving each pixel is further provided on the insulator substrate (). The cathode () is disposed in a region other than the peripheral drive circuit region (). With this arrangement, generation of a back channel by applying the EL element potential to the cathode is prevented in a complementary TFT employed in the peripheral drive circuit region for controlling the display region, thereby suppressing changes in threshold values due to such back channel generation. As a result, an EL display device with reduced generation of penetration current and minimized increased current consumption is achieved.

Electroluminescence display device

A wide line portion is drawn from a cathode while another wide line portion is formed by gathered lines extending from cathode terminals. A contact of realtively large size is formed in a region where the two wide line portions overlap each other with an insulating film being interposed therebetween, so as to connect both wide line portions. Further, in this contact, the cathode terminals and the cathode are connected through an intermediate layer composed of a conductive oxide material. Thus, a reduction in the voltage to be applied to the cathode as a result of increased line resistance between the terminals and the cathode can be prevented, thereby preventing deterioration of display quality.

Line structure in electroluminescence display device

Between a positive power supply and a negative power supply , a p-channel transistor and an n-channel transistor are connected in series while a p-channel transistor and an n-channel transistor are also connected in series. An inverted input signal *Sig is input to the respective gates of the transistors and , while an input signal Sig is input to the respective gates of the transistors and . As a result, of a pair of the transistors connected in series, namely either the transistors and or the transistors and , when one transistor turns ON, the other transistor turns OFF. Thus, generation of through currents is prevented.

Level shifter for use in active matrix display apparatus

A wide line portion is extended from a cathode and another wide line portion is formed by second lines extending from cathode terminals. A contact CN , which is also wide, is formed to connect both wide line portions in a portion where two wide line portions overlap, with an insulating film being interposed therebetween. Further, fifth line connected to the wide line portion is contact with the cathode at second contacts provided in the periphery of the display region. IN these contacts, an intermediate layer composed of a conductive oxide material is interposed, to thereby prevent deterioration of display quality by preventing reduction of a voltage applied to the cathode due to increased line resistance between the terminals and the cathode.

There are provided a data register ( ) for driving an EL element ( ) by a current flowing in a data line ( ) via a TFT ( ) while sequentially capturing input digital video data for each data line, a latch circuit ( ) for holding the data received in the data register ( ) during 1 H period, and n analog switches ( to ) provided between each data line ( ) and a power supply line ( ), to which n bit of digital video data for each one data line is input bit by bit as each control signal. The transistors constituting each switch are made different sizes. As the current amount flowing in each switch therefore differs, the EL element emits light with a luminance in accordance with the digital video data.

Active type EL display device capable of displaying digital video signal

A single liquid-crystal display can be used to be either of direct-vision or projection type, if required. Separate display devices for monitor and OHP are not required. Further, power consumption can be reduced, with the service life of the display being prolonged to improve economy. The liquid-crystal display includes a display housing which receives a liquid-crystal panel, a driver circuit unit and a cooling fan, the display housing being detachably mountable in a back light stand. When the display housing is mounted or dismounted in the back light stand, the fan and back light can automatically be turned on or off to reduce the power consumption. The liquid-crystal panel can be prevented from being degraded by cooling it by way of the fan.

Direct-vision/projection type liquid-crystal display

In a display housing, first and Second liquid-crystal panels are disposed in parallel with each other, and a fluorescent lamp is positioned beside both ends of a gap between these panels. Thus, when used for a transmission type display, e.g. an OHP, the first liquid-crystal panel for light shutter is set in a transmission condition to transmit light from a light source for the OHP or the like and to irradiate the second liquid-crystal panel for displaying an image, thereby projecting the image in a magnified size onto a screen or the like. When used for a direct-vision type display, e.g. a monitor for a personal computer or the like, the first liquid-crystal panel is set in a shading condition to effect diffuse reflection of light from the fluorescent lamp by the first liquid-crystal panel and to irradiate the second liquid-crystal panel, thereby providing a direct-vision image.

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Inazawa, Japan

Masahiro Okuyama