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Liquid crystal drice circuit and semiconductor integrated circuit

A technology of liquid crystal driving circuit and integrated circuit, which is applied in optics, instruments, nonlinear optics, etc., and can solve the problems that hinder the total cost reduction and complexity of liquid crystal modules

Inactive Publication Date: 2004-10-27
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because of this, in Figure 9 Under the structure shown, the first wiring substrate 110 connected to the source driver 104 through the flexible wiring 111 is formed by stacking multi-layer substrates, which is very complicated, and it is one of the obstacles that hinder the reduction of the total cost of the liquid crystal module. big reason

Method used

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  • Liquid crystal drice circuit and semiconductor integrated circuit
  • Liquid crystal drice circuit and semiconductor integrated circuit
  • Liquid crystal drice circuit and semiconductor integrated circuit

Examples

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no. 1 Embodiment

[0049] figure 1 It is a plane configuration diagram of the liquid crystal module 90 in each embodiment of the present invention. As shown in the figure, the liquid crystal module 90 is divided into a liquid crystal display panel 1 and a driving circuit for driving the liquid crystal element 2 in the liquid crystal display portion 1 a of the liquid crystal display panel 1 . In the liquid crystal display portion 1a of the liquid crystal display panel 1, a pair of glass substrates sandwiching the liquid crystal is provided, and the liquid crystal element 2 and the TFT 3 figure 1 A glass substrate (upper glass substrate) and figure 1 The other glass substrate (lower glass substrate) which is not shown facing it is arranged in a matrix. It consists of opposite transparent electrodes on opposing glass substrates and liquid crystal sandwiched between them. Moreover, TFT3 is a transistor, which is connected to the transparent electrode under the upper glass substrate and used to...

no. 2 Embodiment

[0067]In the reference voltage generating buffer 31A having an offset cancel function shown in FIG. Next, at the node N3, Vin+Voff is output, and the shifted reference voltage is output. However, the state shown in FIG. 4(b) must be maintained until the capacitor Coff is charged to the offset voltage Voff. Therefore, there is a concern that if this period of time is too long, the time during which the offset-eliminated voltage value is supplied to the reference voltage generating resistor 32 as a reference voltage will be shortened, and the future low voltage cannot be met. , High precision requirements.

[0068] In this embodiment, an example is described in which a reference voltage generation buffer that can surely eliminate offset is provided. In this embodiment, the liquid crystal module 90, the source driver 4, and the resistor unit 32 for generating a reference voltage in the first embodiment are used as they are (see Figure 1 to Figure 3 ) as the corresponding circ...

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Abstract

A source driver 4A arranged on a liquid crystal panel includes therein in-chip reference voltage wires 17 extending from one end to the other end of an LSI chip. The source driver 4A includes therein: branch reference voltage wires 17 a branching off from in-chip reference voltage wires 17 ; reference voltage production buffers 31; a control circuit 30 for controlling the reference voltage production buffers 31 ; a reference voltage production resistor section 32 for subdividing the reference voltage into values of n steps; voltage level selection circuits 34 each for selecting one of the subdivided voltages; and output buffers 35. Since the reference voltages are supplied to each source driver 4 via wiring for connecting the in-chip reference voltage wires 17 in series with one another, the wiring structure for supplying the reference voltages can be simplified.

Description

[0001] This application is a divisional application with an application date of January 17, 2002, an application number of 00810497.2, and an invention title of "control method for liquid drive circuit, semiconductor integrated circuit, and reference voltage buffer circuit". technical field [0002] The invention relates to a liquid crystal driving circuit for driving liquid crystal elements, a semiconductor chip arranged in the liquid crystal driving circuit and a reference voltage buffer circuit formed in the semiconductor chip. Background technique [0003] So far, we have known the following liquid crystal display panel and a liquid crystal module with a driving circuit added to the liquid crystal display panel. The liquid crystal display panel is composed of a liquid crystal sandwiched between a pair of opposing glass substrates, and When a voltage is applied between a pair of glass substrates, the liquid crystal will change the transmittance of light according to its al...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02F1/133G09F9/30G09G3/20G09G3/36
CPCG09G2310/027G09G3/3688G09G3/2011G09G3/3696G09G3/3614G09G2300/0426G02F1/133
Inventor 土居康之大森哲郎西和义
Owner PANASONIC CORP
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