Abstract: A display driving integrated circuit includes: a tone display reference voltage generating circuit for generating 64 tone display reference voltages by resistive division on the basis of a predetermined reference voltage; D/A conversion circuits each for performing an analog conversion with respect to display data on the basis of the 64 tone display reference voltages; and 64 reference voltage wires provided in parallel, via which the 64 tone display reference voltages are supplied to the D/A conversion circuits, respectively. The 64 reference voltage wires are provided so that a potential difference corresponds to two tones or more between adjacent two reference voltage wires.

Abstract: A liquid crystal driving device in accordance with the present invention includes an offset information storing register for storing digital compensation data, an amplitude information storing register, and a variable resistor for adjusting the maximum gradation display voltage and minimum gradation display voltage in order to cause an absolute value of the difference between a voltage applied to a pixel electrode and a voltage applied to a common electrode to be consistent in all frames. With this, the number of components of the liquid crystal driving device can be restrained and the offset adjustment can be easily carried out with low costs.

Abstract: A display device driver of the present invention includes: an operational amplifier for generating a plurality of gray level display voltages; a switch for selecting and outputting one of the plurality of gray level display voltages according to display data; and a control circuit for detecting the gray level display voltage that was selected and outputted by the switch from the plurality of gray level display voltages, so as to control the operational amplifier. With this configuration, the display device driver reduces power consumption of the display device.

Abstract: In a temperature detecting circuit of the present invention, a bias voltage Vin with relatively steep temperature characteristics is supplied to an inverting input terminal of an inverting amplifier via a resistance R1, a resistance R2 is disposed between the inverting input terminal and an output terminal of the inverting amplifier, and an output of the inverting amplifier is supplied to a non-inverting input terminal of a non-inverting amplifier, and an inverting input terminal of the non-inverting amplifier is connected with a source of a reference potential via a resistance R3 and further connected with an output terminal via a resistance R4. Desired temperature characteristics can be obtained by properly setting resistivities of the resistances R1 and R2, while a desired output voltage value can be obtained for the temperature characteristics given by the inverting amplifier by properly setting resistivities of the resistances R3 and R4.

Abstract: A liquid crystal driving device in accordance with the present invention includes an offset information storing register for storing digital compensation data, an amplitude information storing register, and a variable resistor for adjusting the maximum gradation display voltage and minimum gradation display voltage in order to cause an absolute value of the difference between a voltage applied to a pixel electrode and a voltage applied to a common electrode to be consistent in all frames. With this, the number of components of the liquid crystal driving device can be restrained and the offset adjustment can be easily carried out with low costs.

Abstract: A display device driver of the present invention includes: an operational amplifier for generating a plurality of gray level display voltages; a switch for selecting and outputting one of the plurality of gray level display voltages according to display data; and a control circuit for detecting the gray level display voltage that was selected and outputted by the switch from the plurality of gray level display voltages, so as to control the operational amplifier. With this configuration, the display device driver reduces power consumption of the display device.

Abstract: In a temperature detecting circuit of the present invention, a bias voltage Vin with relatively steep temperature characteristics is supplied to an inverting input terminal of an inverting amplifier via a resistance R1, a resistance R2 is disposed between the inverting input terminal and an output terminal of the inverting amplifier, and an output of the inverting amplifier is supplied to a non-inverting input terminal of a non-inverting amplifier, and an inverting input terminal of the non-inverting amplifier is connected with a source of a reference potential via a resistance R3 and further connected with an output terminal via a resistance R4. Desired temperature characteristics can be obtained by properly setting resistivities of the resistances R1 and R2, while a desired output voltage value can be obtained for the temperature characteristics given by the inverting amplifier by properly setting resistivities of the resistances R3 and R4.

Abstract: A voltage multiplying device of the present invention is provided with: a voltage multiplication level setting circuit for setting a voltage multiplying level which indicates how many times the power source voltage is multiplied; a voltage multiplication pulse signal generating circuit for outputting a plurality of voltage multiplication pulse signals, each having a predetermined period and varying with a predetermined phase difference; a condition decoder circuit and a voltage multiplication pulse selecting circuit for outputting a voltage multiplication controlling signal, which varies in accordance with the determined voltage multiplication level, in synchronization with the pulse signal; and a voltage multiplication level outputting circuit for multiplying the power source voltage step by step to the set voltage multiplication level in accordance with the voltage multiplication controlling signal and for outputting the voltage multiplication level in each of the steps.

Abstract: A liquid crystal display panel 51 of N rows.times.M columns is driven by a segment driver 52 with two different voltages VS1, VS2, and by a common driver 53 with three voltages VC1, VC2, VC3. An output voltage waveform of the segment driver 52 is modulated for gradation display. The two different voltages VS1, VS2 are selected to be low voltages so as not to require high withstand voltage process in the segment driver 52, which makes it easier to integrated to a large scale in the case of realizing the segment driver 52 as a semiconductor integrated circuit.