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Analogue buffer, compensating operation method thereof, and display therewith

A buffer, operating voltage technology, applied in static indicators, instruments, etc., can solve problems such as display quality impact

Inactive Publication Date: 2011-05-18
INNOLUX CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the output voltage of the source follower is large for the driving of the display (for example, 10V), then the error voltage may not seriously affect the driving operation
However, if the output voltage of the source follower is small (for example, 0.5V to 2V) for the driving of the display voltage, the error voltage may be larger than one gray-scale voltage, and the gray-scale voltage will seriously affect the display quality

Method used

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  • Analogue buffer, compensating operation method thereof, and display therewith
  • Analogue buffer, compensating operation method thereof, and display therewith
  • Analogue buffer, compensating operation method thereof, and display therewith

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Embodiment Construction

[0069] The present invention provides a source follower type analog buffer with effective load, and a novel compensation operation method developed to reduce the error voltage difference between the input voltage and the output voltage of the analog buffer. A source follower type analog buffer also minimizes variations in both charging time and device characteristics, and maximizes input voltage range.

[0070] A source follower was proposed in Patent Application No. 11 / 356,160 filed on February 16, 2006 with the title "SOURCE-FOLLOWER TYPE ANALOGUE BUFFER, COMPENSATING OPERATION METHOD THEREOF, AND DISPLAY THEREWITH", wherein the above-mentioned patent application The entirety of is incorporated herein by reference and becomes a part of this specification. like Figure 3A As shown in , a payload 320 is added, which is a thin film transistor. The payload 320 is designed to have a large channel length (L) to minimize direct current (DC) current and reduce kink effect. Figur...

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Abstract

A source-follower-type analogue buffer with an active load, a new compensating operation and a display with the source-follower-type analogue buffers are developed to reduce an error voltage which is the difference between an input voltage and an output voltage of the analogue buffer. The source-follower type analogue buffer can also minimize the variation from both the charging time and the device characteristics and maximize the range of the input voltage.

Description

technical field [0001] The invention relates to an analog buffer. More specifically, the present invention relates to an active matrix display using polysilicon thin film transistor (TFT) source follower analog buffers. Background technique [0002] A low temperature polysilicon (LTPS, low temperature poly-Si) thin film transistor (TFT, thin film transistor) allows a driving circuit due to a high current driving capability to be integrated with the periphery of a pixel panel of an active matrix display. However, it is well known that it is very difficult to integrate the entire driving circuit with polysilicon thin film transistors (TFTs) due to the relatively poor characteristics and non-uniformity of polysilicon thin film transistors compared with single crystal silicon large scale integrated circuits (LSIs) of. Polysilicon Among many driving circuits using polysilicon thin film transistors (TFTs), analog buffers are indispensable for driving the load capacitance of the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G09G3/36
Inventor 余承和薛富元林韦丞佐野景一戴亚翔
Owner INNOLUX CORP