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Operational transconductance amplifier circuit

A technology of transconductance amplifiers and circuits, which can be used in gate-controlled amplifiers, DC-coupled DC amplifiers, instruments, etc., and can solve problems such as slope overshoot, consumption, and high power

Inactive Publication Date: 2005-02-02
KONINKLIJKE PHILIPS ELECTRONICS NV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, using a relatively slowly varying voltage ramp to drive a row of pixel elements 10 and then rapidly discharging that voltage ramp in preparation for driving the next row of pixel elements 10 can cause various problems, including ramp overshoot and high power consumption

Method used

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  • Operational transconductance amplifier circuit
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  • Operational transconductance amplifier circuit

Examples

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Embodiment Construction

[0052] Reference will now be made in detail to the illustrated embodiments of the invention, examples of which are shown in the accompanying drawings. This embodiment includes an OTA ramp source 41 with enhanced drive capability during ramp retrace. In addition, the ramp source 41 is used to drive a liquid crystal display.

[0053] The ramp source of FIG. 2 produces voltage ramps on lines 20 and 22, as described above. image 3 One of these voltage ramps 100 is shown (positive direction). Due to another voltage ramp and image 3 The voltage ramps of the two ramps are phase-inverted (reversed), so it should be understood that the following description applies to both ramps.

[0054] Such as image 3 As shown, the voltage ramp 100 starts from the minimum voltage 102 (V min_ramp ) starting with time (horizontal axis) t ramp rises to a maximum voltage of 104 at 106 (V max_ramp ). at t ramp process, the voltage ramps 100 at a maximum rate of 108 (SR RLCD+ )Variety. The r...

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PUM

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Abstract

An operational transconductance amplifier circuit, and a liquid crystal display that uses such an operational transconductance amplifier circuit circuit, having a controlled slew rate. The operational transconductance amplifier circuit has an output that drives a load, beneficially a liquid crystal display panel. That operational transconductance amplifier circuit includes a first current source (132) that sinks a first tail current (204), and a second current source (134) that selectively sinks a second tail current (205). That second current source (134) is selected by a control signal applied to a switch (136). When the second current source (134) sinks the additional second tail current (205) the slew rate of the operational transconductance amplifier circuit is increased. When used in a liquid crystal display, the operational transconductance amplifier circuit drives the liquid crystal display panel with a ramp. During ramp fly back (tfb), the second current source (134) sinks the second tail current (205) and increases the slew rate.

Description

technical field [0001] The invention relates to an operational transconductance amplifier circuit, including a slope source of the operational transconductance amplifier, and a liquid crystal display. Background technique [0002] The use of liquid crystal displays (LCDs) to produce color images is well known. Such displays are particularly useful for producing images that are updated by frames as in color television. Typically, each graphics frame consists of color subframes, usually red, green and blue subframes. [0003] This LCD system uses a liquid crystal display composed of a large number of individual liquid crystal pixel elements. These pixel elements are preferably arranged in a matrix, consisting of pixel rows and pixel columns. To produce the desired image, the individual pixel elements are adjusted according to the image information. Typically, this image information is applied to individual pixel elements on a row-by-row basis, with each pixel row being add...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03F3/34G09G3/20G09G3/36H03F3/72
CPCG09G2310/0259G09G3/3688G09G3/2011H03F3/72
Inventor L·R·阿布P·J·M·詹森
Owner KONINKLIJKE PHILIPS ELECTRONICS NV