| HITACHI DEVICE ENGINEERING CO., LTD. Patent applications |
| Patent application number | Title | Published |
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| 20120069692 | SEMICONDUCTOR DEVICE - A data input buffer is changed from an inactive to an active state after the reception of instruction for a write operation effected on a memory unit. The input buffer is a differential input buffer having interface specs based on SSTL, for example, which is brought to an active state by turning on a power switch to cause a through current to flow and receives a signal therein while immediately following a small change in small-amplitude signal. Since the input buffer is brought to the active state only when the write operation's instruction for the memory unit is provided, it is rendered inactive in advance before the instruction is provided, whereby wasteful power consumption is reduced. In another aspect, power consumption is reduced by changing from the active to the inactive state in a time period from a write command issuing to a next command issuing. | 03-22-2012 |
| 20110261639 | Semiconductor memory circuit - The present invention provides a semiconductor memory circuit capable of reducing current consumption at non-operation in a system equipped with a plurality of chips that share the use of a power supply, address signals and a data bus. The semiconductor memory circuit has an internal circuit which is capable of selectively performing the supply and stop of an operating voltage via switch means and includes a memory array. An input circuit, which receives a predetermined control signal therein, controls the supply and stop of the operating voltage by the switch means to reduce a DC current and a leak current when no memory operation is done, whereby low power consumption can be realized. | 10-27-2011 |
| 20110205480 | Liquid crystal display device - The present invention provides a liquid crystal display device which can obviate cutting off of a peripheral region of the liquid crystal display device which is provided with an inspection circuit and can surely perform the inspection of an image display even when the peripheral region is narrowed. On a substrate of the liquid crystal display device, a pixel region which is comprised of a plurality of gate lines and a plurality of drain lines and a peripheral region which surrounds the pixel region are formed. A turn-on inspection terminal of the liquid crystal display device are formed on the peripheral region and a semiconductor chip for driving liquid crystal is formed on the inspection terminal. The semiconductor chip is electrically insulated from the inspection terminal. | 08-25-2011 |
| 20110141384 | LIQUID CRYSTAL DISPLAY DEVICE - The present invention provides a liquid crystal display device which can obviate cutting off of a peripheral region of the liquid crystal display device which is provided with an inspection circuit and can surely perform the inspection of an image display even when the peripheral region is narrowed. On a substrate of the liquid crystal display device, a pixel region which is comprised of a plurality of gate lines and a plurality of drain lines and a peripheral region which surrounds the pixel region are formed. A turn-on inspection terminal of the liquid crystal display device are formed on the peripheral region and a semiconductor chip for driving liquid crystal is formed on the inspection terminal. The semiconductor chip is electrically insulated from the inspection terminal. | 06-16-2011 |
| 20110090605 | SEMICONDUCTOR INTEGRATED CIRCUIT - An integrated circuit formed on a semiconductor chip includes voltage regulators for stepping down an externally-supplied power voltage to produce an internal power voltage, and internal circuits which operate based on the internal power voltage. The voltage regulators are laid in the area of the buffers and protective elements for the input/output signals and power voltages so that the overhead area due to the on-chip provision of the voltage regulators is minimized. The internal power voltage is distributed to the internal circuits through a looped main power line, with an electrode pad for connecting an external capacitor for stabilizing the internal power voltage being provided on it, so that the internal power voltage is stabilized and the power consumption of the integrated circuit is minimized. | 04-21-2011 |
| 20110074747 | Liquid Crystal display device - The present invention realizes proper driving circuits in a driving-circuit integral type liquid crystal display device which has an increased screen size. The liquid crystal display device includes a liquid crystal display panel and a driving circuit which supplies video signals to video signal lines formed on the liquid crystal display panel. The driving circuit is comprised of a first driving circuit which is formed in a step similar to a step for forming pixels provided to the liquid crystal display panel and a second driving circuit which is connected to the liquid crystal display panel after formation of the liquid crystal display panel. The first driving circuit is constituted of a switching circuit which is capable of distributing an output of the second driving circuit to a plurality of video signal lines. | 03-31-2011 |
| 20110032777 | Semiconductor memory circuit - The present invention provides a semiconductor memory circuit capable of reducing current consumption at non-operation in a system equipped with a plurality of chips that share the use of a power supply, address signals and a data bus. The semiconductor memory circuit has an internal circuit which is capable of selectively performing the supply and stop of an operating voltage via switch means and includes a memory array. An input circuit, which receives a predetermined control signal therein, controls the supply and stop of the operating voltage by the switch means to reduce a DC current and a leak current when no memory operation is done, whereby low power consumption can be realized. | 02-10-2011 |
| 20100149883 | SEMICONDUCTOR DEVICE - In a semiconductor device having a data input buffer capable of inputting write data to each of memory units, the data input buffer is changed from an inactive state to an active state after the reception of instruction for a write operation effected on the memory unit. The data input buffer is a differential input buffer having interface specs based on SSTL, for example, which is brought to an active state by the turning on of a power switch to thereby cause a through current to flow and receives a signal therein while immediately following a small change in small-amplitude signal. Since the input buffer is brought to the active state only when the write operation's instruction for the memory unit is provided, the data input buffer is rendered inactive in advance, before the instruction for the write operation is provided, whereby wasteful power consumption is reduced. In another aspect, power consumption is reduced by changing from the active to the inactive state in a time period from a write command issuing to a next command issuing. | 06-17-2010 |
| 20090195490 | Driving method for display device - A liquid crystal display includes pixels each having an switching element, drain drivers and gate drivers for operating the switching elements and the pixels, and drain lines and gate lines supplying signals from the drain drivers and the gate drivers to the switching elements being formed on one of a pair of substrates sandwiching a liquid crystal layer. Wiring lines are formed on the one of a pair of substrates for transferring display data signals and a clock signal to the gate drivers. | 08-06-2009 |
| 20090115790 | DISPLAY CONTROL DEVICE AND MOBILE ELECTRONIC APPARATUS - A display control device and technique for controlling displays on a display unit, in which a plurality of display segments are two-dimensionally arranged (e.g. a dot matrix type display unit), is provided. The technique is effectively applicable to a write data latch circuit of a memory for storing display data in the display control device, such as, for example, a liquid crystal display control device, a mobile electronic apparatus, etc. A display drive control technique for controlling a moving picture display mode of a display device is also provided. The display drive control circuit controls a picture display mode of a display device for displaying still pictures and moving pictures to a liquid crystal display device, such as, for example, a dot matrix type display devices, an organic EL display device, etc. | 05-07-2009 |
| 20090046517 | SEMICONDUCTOR DEVICE - In a semiconductor device having a data input buffer capable of inputting write data to each of memory units, the data input buffer is changed from an inactive state to an active state after the reception of instruction for a write operation effected on the memory unit. The data input buffer is a differential input buffer having interface specs based on SSTL, for example; which is brought to an active state by the turning on of a power switch to thereby cause a through current to flow and receives a signal therein while immediately following a small change in small-amplitude signal. Since the input buffer is brought to the active state only when the write operation's instruction for the memory unit is provided, the data input buffer is rendered inactive in advance, before the instruction for the write operation is provided, whereby wasteful power consumption is reduced. In another aspect, power consumption is reduced by changing from the active to the inactive state in a time period from a write command issuing to a next command issuing. | 02-19-2009 |
| 20080285185 | SEMICONDUCTOR INTEGRATED CIRCUIT - An integrated circuit formed on a semiconductor chip includes voltage regulators for stepping down an externally-supplied power voltage to produce an internal power voltage, and internal circuits which operate based on the internal power voltage. The voltage regulators are laid in the area of the buffers and protective elements for the input/output signals and power voltages so that the overhead area due to the on-chip provision of the voltage regulators is minimized. The internal power voltage is distributed to the internal circuits through a looped main power line, with an electrode pad for connecting an external capacitor for stabilizing the internal power voltage being provided on it, so that the internal power voltage is stabilized and the power consumption of the integrated circuit is minimized. | 11-20-2008 |
| 20080273001 | Level converter circuit and a liquid crystal display device employing the same - A display device includes a pixel driver circuit. Each of level converter circuits in the pixel driver circuit has an input terminal supplied with a signal swinging between a first voltage and a second voltage lower than the first voltage; a first first-conductivity-type transistor having a gate electrode coupled to the input terminal, and a source region coupled to a reference voltage; a second second-conductivity-type transistor having a gate electrode coupled to a drain region of the first transistor, a source region-coupled to a power supply, and a drain region coupled to an output terminal; one circuit element among a diode, a resistor and a fourth second-conductivity-type transistor, coupled between the gate electrode of the second transistor and the power supply; a third first-conductivity-type transistor having a source region coupled to the input terminal, a drain region coupled to the output terminal, and a gate electrode supplied with a do voltage. | 11-06-2008 |
