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Source driver circuit of liquid crystal display device

A liquid crystal display device, source driver technology, applied in static indicators, logic circuit connection/interface layout, instruments, etc., can solve problems such as slowness

Inactive Publication Date: 2011-06-29
SILICON WORKS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, the output voltage of the channel buffer falls in a slow mode like the output voltage of the gamma buffer

Method used

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  • Source driver circuit of liquid crystal display device
  • Source driver circuit of liquid crystal display device
  • Source driver circuit of liquid crystal display device

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Embodiment Construction

[0024] Preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings describing examples. Wherever possible, the same reference numbers will be used throughout the drawings and the specification to refer to the same or like parts.

[0025] image 3 It is a circuit diagram of a positive gamma buffer applied to a source driver circuit of a liquid crystal display device according to an embodiment of the present invention. see image 3 , the positive gamma buffer includes a differential amplification part 310 , a current mirror part 320 , an enabling part 330 , a power-down speed increasing part 340 , and an output part 350 .

[0026] The differential amplification section 310 includes NMOS transistors M31 and M32. The NMOS transistor M31 has a gate connected to the input terminal IN, and the NMOS transistor M32 has a gate connected to the output terminal OUT.

[0027] The current mirror section 320 includes PMOS transis...

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Abstract

A source driver circuit of a liquid crystal display device including a gamma buffer. The gamma buffer includes a differential amplification section configured to differentially amplify an input signal; a current mirror section configured to operate as a current mirror; an enable section configured to convert the differential amplification section from a standby mode to an enable mode by a bias voltage; a power drop speed improvement section configured to respectively connect drains of the two PMOS transistors of the current mirror section and drains of the two NMOS transistors of the differential amplification section through two diode coupling type MOS transistors, and shorten a recovery time after a power drop; and an output section configured to be determined in a bias level thereof by the bias voltage and generate an output voltage according to a voltage of a downstream node on one side of the current mirror section.

Description

technical field [0001] The present invention relates to a technique for stably providing the output voltage of a source driver circuit in a liquid crystal display device, in particular to a source driver circuit of a liquid crystal display device, which can The recovery time of the output voltage of the gamma buffer is shortened. Background technique [0002] figure 1 A block diagram illustrating a driving circuit of a conventional liquid crystal display device. see figure 1 , the driving circuit of the traditional liquid crystal display device includes a flexible printed circuit (FPC) 120, the flexible printed circuit 120 includes a gamma voltage supply unit, and is arranged on a printed circuit board (printed circuitboard, PCB) 110, and The source driver integrated device 130 is configured to receive the gamma voltage from the gamma voltage supply unit of the flexible circuit board 120 and drive the data lines of the liquid crystal display panel 140 . In the liquid cry...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G09G3/36
CPCH03F1/22G09G3/36G09G3/3685G09G3/20G09G2300/0408G09G2320/0252G02F1/133H03K17/687G09G3/3696H03F3/45H03K19/0175
Inventor 宋贤旻孙英硕金志勋罗俊皞
Owner SILICON WORKS CO LTD
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