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Output driver of display device

A technology of output driver and output node, applied in the direction of static indicators, instruments, etc., can solve the problem of lower slew rate of the amplifier of the output driver, achieve the effect of reducing output deviation, eliminating error, and reducing the time required for decoding

Pending Publication Date: 2021-11-19
ACONIC INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In particular, the slew rate (slew rate) of the amplifier of the output driver may decrease due to the increase of the load resistance and load capacity

Method used

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  • Output driver of display device
  • Output driver of display device
  • Output driver of display device

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Embodiment Construction

[0045] The output driver in the embodiment of the present invention includes: a digital-to-analog converter for generating a first voltage and a second voltage different from the first voltage; The first capacitor and the second capacitor are alternately charged on the basis of the voltage difference; and the amplifying part alternately receives and outputs each charging voltage charged to the first capacitor and the second capacitor, and then charges the first capacitor and the second capacitor with the first charging voltage. The control unit outputs a second charging voltage for charging the second capacitor to an output node of the amplifying unit within a first charging time during which the first capacitor is charged. The output driver of the display device according to an embodiment of the present invention can reduce the time required for decoding and realize high-speed driving by performing the sampling operation and the driving operation together.

[0046] The specif...

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Abstract

An output driver of a display device according to an embodiment of the present application comprises: a digital-to-analog converter which generates a coarse voltage and a fine voltage; a control unit which alternately charges first and second capacitors on the basis of the voltage difference between the coarse voltage and the fine voltage; and an amplifying unit which alternately receives the respective charging voltages charged in the first and second capacitors, and continuously outputs an output voltage. The control unit outputs a second charging voltage charged in the second capacitor to an output node of the amplifying unit during a first charging period for charging a first charging voltage in the first capacitor.

Description

technical field [0001] The present application relates to an output driver of a display device. Background technique [0002] Recently, as the size and resolution of display panels increase, flexible gamma curve settings and increased color depth are required. In order to meet the above demands, an output driver occupying a larger area should be used in the driving circuit of the display device. [0003] Also, the capacity of the load resistor and load capacitor connected to the output driver increases, and accordingly, the target voltage of the image signal increases. In particular, the slew rate of the amplifier of the output driver may decrease due to the increase of the load resistance and load capacity. [0004] Therefore, there is a need for an output driver of a display device that can increase the slew rate of an amplifier through a pre-emphasis operation, thereby reducing decoding time and circuit area. Contents of the invention [0005] Therefore, the technica...

Claims

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Application Information

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IPC IPC(8): G09G3/20
CPCG09G3/20G09G3/2092G09G2310/0248G09G2300/0828G09G2300/0833G09G2320/0276G09G2230/00
Inventor 李玟宰
Owner ACONIC INC