Sharp Kabushiki Kaisha Corporation

Rohm Co., Ltd.

Toshio Nishimura

Akitaka Morita

Shintaro Hashimoto

Yasuhiro Nakanishi

Masayuki Natsumi

Hirohide Nakagawa

Hiroshi Takada

Masakazu Saka

Kazutomo Fujita

Tetsuya Yoshida

Megumi Fukusaki

Yohei Ishimaru

Masami Azuma

Atsushi Murayama

Shintarou Hashimoto

A display control device uses frame rate control, and converts m-bit input data (m is an integer) representing brightness of each pixel, to n-bit output data (n is an integer, n&#x3c;m), to control brightness of each pixel. A first frame rate controller generates a plurality of first tone data according to the input data, and outputs the generated data in a time division manner for each predetermined first timing. A second frame rate controller generates a plurality of second tone data according to the input data, and outputs the generated data in a time division manner for each predetermined first timing. Rate of change of brightness represented by the first tone data with respect to the input data, and rate of change of brightness represented by the second tone data with respect to the input data are made different.

Display control device with frame rate control

In a picture telephone, an apparatus is provided which images the face of an operator in a natural manner for a conversation, with an eye height at which the operator looks at an image expressing a partner of the conversation. A number of photodiodes are disposed each adjacent to each pixel electrode, on surfaces facing each other of a pair of substrates between which a liquid crystal of a transmission type active matrix liquid crystal display apparatus is interposed. Outputs from the respective photodiodes are read out by a so-called inter-line transmission method which utilizes a scanning function of a CCD (charge coupled device).

Display device having display and imaging pixels sandwiched between same

The present invention discloses a liquid crystal display device capable of reducing charges to be supplied from a driving circuit, increasing response speed of liquid crystals and delivering superior display. A liquid crystal display device is provided with a switching circuit between scanning electrodes of a liquid crystal display panel 25 and a common driver. The switching circuit is provided with switching elements, and each switching element is disposed between two scanning electrodes adjacent to each other. Furthermore, each switching element is turned on and off by a control means. For a predetermined period after the completion of a horizontal scanning period, a scanning electrode, to which a selection potential has been applied during the horizontal scanning period, and a scanning electrode, to which the selection potential is to be applied next are isolated once from a power supply circuit, and then electrically connected to each other by turning on the switching element so as to have an identical potential. With this structure, power to be supplied from the common driver can be reduced.

Liquid crystal display device

An electronic account recording device according to the present invention has number keys for effecting the input of a number, a switch key for selecting an item from a plurality of items, an amount key for recording an expense amount as inputted by the number keys, and a scan keys for calling back sequentially the expense amounts recorded by the number keys and the amount key. The device further has a display for displaying an item name and an expense amount during the input as effected by the number keys and the amount key, and also during the call back as effected by the scan key, and a memory for storing the item name and the expense amount in pairs sequentially in the input order. A controller is provided which operates in response to an actuation of the scan key, to call back the expense amounts chained by the item name. Thus, the expense amounts of one item are sequentially called back and displayed through the display one at a time and, thereafter, the expense amounts of another item are sequentially called back and displayed one at a time.

Electronic account recording device

An electronic apparatus includes a delay circuit which generates a delayed output signal to initial-clear the memory elements and a detection circuit for detecting a startup which operates at an operating voltage greater than the absolute value of any of the operating voltages of the memory elements. The output signal from the delay circuit is released on the basis of the output from the detection circuit. A reset circuit of this type obviates the need for a system reset key and thereby eliminates the disadvantages associated with such a key.

Reset circuit for electronic apparatus

A liquid crystal display driver has a 1/4-duty binary-voltage driving system. This driving system generates at least four separate common signals and at least eleven separate segment signals. Although the duty cycle is 1/4. V.sub.on /V.sub.off ratio of the effective value is greater than 1.7. This is accomplished by using four common electrodes and seven segment electrode per each individual pattern generator.

Liquid crystal display driver

Electronic currency conversion apparatus including, among other things, an input keyboard comprising a set of keys for inputting amounts of money in each of two different currencies, calculating circuitry for calculating a currency conversion exchange rate according to the amounts of money inputted via the input keyboard circuitry for subsequently calculating a currency conversion for a predetermined amount of money inputted at the input keyboard based on the calculated conversion rate, mode selection keys operable by a user for selecting an exchange rate calculating mode and a currency conversion mode, and a visual display including exchange rate symbol display, the exchange rate symbol display being energized in a flashing type of indication during the exchange rate calculating mode upon the inputting of a money amount.

Electronic apparatus with currency conversion function

An electronic record keeping device for recording numerical data under different items. The device has a casing and a memory having a plurality of sections. The number of the sections corresponds to the number of items. Each section has a first memory area for storing a budget data and a second memory area for storing a cumulative expenditures. A key board provided on the casing has number keys for effecting the input of a numerical data, a plurality of item keys for effecting an access to a corresponding section in the memory upon depression of one item key, a mode key for changing the mode between a first mode for entering the budget data in the first memory area, and the second mode for entering the cumulative expenditure in the second memory area. A display is provided for displaying a numerical data inputted by the number keys, and a controller is provided to operate in response to a depression of one of the item keys such that, while the first mode is established, a numerical data as inputted by the number keys is entered and stored in the first memory area as the budget data, and that, while the second mode is established, a numerical data as inputted by the number keys is added to the cumulative expenditure previously stored in the second memory area in the second memory area.

Electronic record keeping device

A voltage stabilizer receiver power from a power circuit for inputting a power source voltage. The voltage stabilizer changes the width of pulses in accordance with the changes in the effective value of the power source voltage and stabilizes the effective value of an applied voltage to a display regardless of the change in the effective value of the power source voltage by subtracting this pulse from pulses comprising the display drive waveforms.

Effective value voltage stabilizer for a display apparatus

A solar power circuit for an electronic apparatus includes a solar power circuit including a solar battery, and a capacitor for storing an extra voltage between a solar power voltage and a source voltage supply necessary for driving the apparatus.

Solar battery circuit

A solar power circuit for an electronic apparatus using a solar battery and a secondary battery formed of a booster circuit including a plurality of booster condensers. One of the booster condensers functions as a backup condenser for preventing a control circuit of the apparatus from malfunctioning due to the momentary faults where the primary battery stops supplying power voltage to the apparatus.

Solar power circuit

A graph-drawing machine adapted to print and output numerical data in graph form when numerical data are inputted and a given graph-printing instruction is given. The maximum value or the minimum value of the scale is optionally set by the user in the drawing of the graph. The numerical data exceeding the maximum value or the minimum value are printed in a numeric format instead of being graphed. Incorrectly inputted data can be more easily identified because data which exceeds the present boundaries are printed in a numeric form.

Graph-drawing machine

An electronic alarm timepiece comprises an alarm generation circuit for generating a plurality of alarm tones, and an alarm selection circuit for selecting a particular alarm tone from the plurality of alarm tones and for enabling generation of the particular alarm tone in response to the agreement between current time information and alarm time information, the selection of the particular alarm tone and the enabling of the generation of the particular alarm tone being carried out by a single operation of the alarm selection means. Preferably, an electronic calculator is incorporated within the electronic alarm timepiece.

Combined electronic calculator and electronic alarm timepiece

A power consumption reduction device in an LSI device is disclosed which includes a liquid crystal display drive circuit. The liquid crystal enabling voltage generator including bleeder resistors and adapted for generating three voltage levels is provided with means for shutting down current paths via the bleeder resistors.

LSI Device including a liquid crystal display drive

An integrated circuit device having a combined time-keeping mode and calculator mode comprises a generator stage for generating basic clock signals and system clock signals, a processor stage responsive to a supply of the system clock signals for executing arithmetic operations required for the timekeeping mode and the calculator mode key input members for introducing information into the processor stage as key input signals, and a clock control for controlling the supply of the system clock signals. The processor stage is adapted to develop a command signal to indicate the completion of the arithmetic operations. The clock control is responsive to the rising and trailing edges of the key input signals for enabling the supply of the system clock signals. The generation of the command signal causes the clock control to prevent the system clock signals from being fed to the processor stage.

Growing community of inventors

Kyoto, Japan

Toshio Nishimura