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Power supply circuit for liquid crystal display

A technology of power supply circuit and power supply voltage, applied in the direction of electrical components, adjusting electric variables, static indicators, etc., can solve problems such as difficulties and large losses

Inactive Publication Date: 2005-08-17
SEIKO INSTR INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the voltage difference is large, the corresponding loss is also large, which makes it difficult to implement a liquid crystal display device with low power consumption.

Method used

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  • Power supply circuit for liquid crystal display
  • Power supply circuit for liquid crystal display
  • Power supply circuit for liquid crystal display

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0024] figure 1 is a block diagram of a power supply circuit for liquid crystals according to an embodiment of the present invention. In the structure of the block diagram, a boost type rectifier regulator 101 and an inverting type rectifier regulator 102 have such Figure 4 The same structure shown. figure 2 The voltages VH, V1, and VL shown are established by the boost type rectifier regulator 101 and the inverting type rectifier regulator 102 . The voltages VH, V1 and VL are used as power supplies provided on the common side of the liquid crystal display device.

[0025] The boost type rectifier regulator 101 is constituted as Figure 4 As shown, a FET 105, an error amplifier 106, control circuit 107, reference voltage 108, and feedback resistors 109 and 110. This step-up chopper type rectifier regulator is composed of an inductor 103 and a diode 104 together as external devices. Also the inverting rectifier regulator 102 is constituted with an error amplifier 114, a ...

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PUM

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Abstract

The present invention provides a power supply circuit for a liquid crystal panel, comprising a power source used for generating a power supply voltage applied at the common side of the liquid crystal panel, an electric voltage distributing circuit used for distributing the power supply voltage and outputting distributed electric voltage, a buff circuit used for receiving the distributed electric voltage and outputting a bias voltage to the commutation side of the liquid crystal panel, a commutation voltage stabilizer used for generating an output electric voltage, wherein, the distributed electric voltage is used as reference voltage of the commutation voltage stabilizer and the output electric voltage of the commutation voltage stabilizer is used as positive power supply voltage of the buff circuit.By supplying a positive power supply of an operational amplifier from a switching regulator using an input voltage of the operational amplifier as the reference voltage thereof, even if the bias ratio is varied, the ratio of the positive power supply voltage of the operational amplifier to an output voltage of the operational amplifier is always constant, and thus, there is an effect that a liquid crystal display device with low power consumption can be implemented independently of the panel.

Description

[0001] This application is a divisional application of the invention patent application with the filing date of July 27, 1999, the application number "99111299.7", and the title of the invention "power supply circuit for liquid crystal display". technical field [0002] The invention relates to a power supply circuit for driving a liquid crystal display device. Background technique [0003] As a general circuit for driving a liquid crystal display device, a power supply circuit using a rectifier regulator as shown in the circuit diagram of FIG. 3 is well known. In particular, rectifier regulators and transformers are used to obtain the positive and negative power supplies necessary for the drive voltage. [0004] Such as figure 2 As shown, in a liquid crystal display device using a driving method such as multi-line addressing (MLA), voltage characteristics of VH, VL, and V1 as common-side driving voltages must satisfy the equation VH-V1=VL. If this equation is not satisfie...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02F1/133G09G3/36H02M3/155
CPCH02M2001/0006G09G3/3625G09G2330/02H02M2001/008G09G3/3622H02M1/0006H02M1/008G02F1/133
Inventor 下田贞之向中野浩志
Owner SEIKO INSTR INC