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Adaptable method and system for channel operational amplifiers without line buffers

An operational amplifier, buffer technology, used in instruments, static indicators, etc., to solve problems such as conflicts

Active Publication Date: 2021-01-22
HIMAX TECH LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] However, for the design of operational amplifiers (OPAs), small quiescent current and short settling time are in conflict with each other

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  • Adaptable method and system for channel operational amplifiers without line buffers
  • Adaptable method and system for channel operational amplifiers without line buffers
  • Adaptable method and system for channel operational amplifiers without line buffers

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Embodiment Construction

[0057] In order to solve the trade-off problem between quiescent current (or power consumption) and settling time (or rotation rate), a kind of adjustable (adaptive) channel operational amplifier suitable for source driver 15 is proposed, which has at least two power Modes: High Power Mode (Normal Mode) and Low Power Mode. Among them, the high-power mode has a higher rotation rate (or shorter settling time), while the low-power mode has a smaller quiescent current.

[0058] figure 2 A timing diagram of the voltage difference of two adjacent rows of pixel data is shown as an example. When the voltage difference ΔV between the current row n pixel data and the previous row n-1 pixel data is zero, the channel operational amplifier operates in low power mode; the voltage difference ΔV between the current row n pixel data and the previous row n-1 pixel data is not At zero time, the channel op amp operates in high power mode. Therefore, the channel operational amplifier can adjus...

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Abstract

The invention provides an adjustable method of a channel operational amplifier of a non-line buffer. The adjustable method comprises the following steps: a row of pixel data is cut into multi-group pixel data; a plurality of pixels of the corresponding groups of adjacent rows are compared to respectively obtain the difference of the pixel; the maximum difference can be obtained based on the difference value; the power mode of the operational amplifier of the channel can be determined based on the maximum difference. The adjustable method of a channel operational amplifier of a non-line buffercan improve the efficiency of a liquid crystal display.

Description

technical field [0001] The present disclosure relates to a source driver of a liquid crystal display, in particular to an adjustable method and system for a channel operational amplifier without a line buffer. Background technique [0002] Liquid crystal display (LCD) has the advantages of light weight, low power consumption and no radiation, so it is widely used in various electronic products, such as desktop computers, tablet computers, mobile phones, etc., as output display. [0003] figure 1 A system block diagram of the liquid crystal display 100 is shown. The gate lines GL1 -GLn and the data lines DL1 -DLm intersect each other to define a plurality of pixels arranged in a matrix on the liquid crystal panel 11 . A thin film transistor TFT and a liquid crystal capacitor Clc are formed in each pixel, serving as a switch and a liquid crystal cell respectively. The voltage difference between the pixel electrode (pixel electrode) and the common voltage (Vcom) electrode of...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G09G3/36
CPCG09G3/36
Inventor 李振东张钦兆
Owner HIMAX TECH LTD