JPS6438693U - - Google Patents

Description

[Brief explanation of the drawing]

FIG. 1a is a graph showing the contrast versus applied effective voltage characteristics of a liquid crystal. Figure 1b shows Vth, Vsa
Graph showing temperature characteristics of t and Voff. Figure 1c shows an example of the voltage waveform applied to the liquid crystal display. Figure 2 shows an example of a conventional configuration of a power supply for a liquid crystal display. FIG. 3 shows an example of the configuration of the stabilized power supply for liquid crystal display according to the present invention. Fourth
Figures a, b, c, d, and e are explanatory diagrams of the temperature coefficient and voltage level adjustment circuits in Figure 3. Figure 5 a is the third
An example of the configuration of an operational amplifier in which the input offset voltage in the figure is zero. FIG. 5b shows the operational amplifier with a built-in reference voltage source in FIG. 3. Figure 6 shows the NP in Figure 3.
A diagram showing the structure of an N transistor.

Amendment August 12, 1983 The scope of claims for utility model registration is amended as follows.

[Scope of Claim for Utility Model Registration] In a stabilized power supply for a liquid crystal display that supplies a power supply voltage that compensates for the temperature characteristics of the liquid crystal display to a liquid crystal display, a PN junction diode, a first variable resistor, and a first a first series circuit comprising MOS transistors connected in series between power supplies; at least one of two inputs is connected to the first series circuit; and a temperature-stable reference voltage is provided between the two inputs. and a C supplying an output to the gate of the first MOS transistor to cause a constant current to flow through the first series circuit.
a second series circuit formed by connecting a first MOS operational amplifier, a second variable resistor, and a second MOS transistor in series between the power supplies; and a selection from the first and second variable resistors. a CM that inputs the potentials at the first input and the second input, respectively, and supplies the output to the gate of the second MOS transistor;
an OS-type second operational amplifier, and at least one of the first variable resistor and the second variable resistor has a plurality of division points, and each of the division points and the second
A plurality of MOS transistor switches connected between the input of an operational amplifier and one of which is set to a conductive state, and a conductive state set to the plurality of MOS transistor switches at the time of initial adjustment are memorized and the conductive state is determined. 1. A stabilized power supply for a liquid crystal display, comprising a nonvolatile memory device for maintaining the power . The brief description of the drawing has been amended as follows. On page 13, lines 12 and 13 of the specification, the words "an example." are corrected to "a figure showing." On page 13 of the specification, lines 14 to 15 and 19, the words ``Example of configuration.'' are corrected to ``Diagrams showing the configuration.'' On page 14 of the specification, line 2, replace “Amplifier.” with “
A diagram showing an amplifier. ” he corrected.

Claims (1)

[Scope of utility model registration request] In a stabilized power supply for a liquid crystal display that supplies a power supply voltage that compensates for the temperature characteristics of the liquid crystal display, a PN junction diode, a first variable resistor, and a first MOS transistor are connected in series between the power supplies. a first series circuit connected to the first series circuit; at least one of two inputs is connected to the first series circuit, and a reference voltage stable with respect to temperature is provided between the two inputs, and an output is connected to the first series circuit; C supplied to the gate of the MOS transistor to cause a constant current to flow through the first series circuit;
a second series circuit formed by connecting a first MOS operational amplifier, a second variable resistor, and a second MOS transistor in series between the power supplies; and a selection from the first and second variable resistors. a CM that inputs the potentials at the first input and the second input, respectively, and supplies the output to the gate of the second MOS transistor;
an OS-type second operational amplifier, and at least one of the first variable resistor and the second variable resistor has a plurality of division points, and each of the division points and the second
a plurality of MOS transistor switches connected between the input of the operational amplifier and one of which is set to a conductive state, together with the PN junction diode, the first operational amplifier, and the second operational amplifier. A stabilized power supply for a liquid crystal display characterized by being integrated on the same substrate.