Drive unit for display device

Patent metadata

Field	Value
Publication number	US-11626063-B2
Application number	US-202217578021-A
Country	US
Kind code	B2
Filing date	Jan 18, 2022
Priority date	Dec 26, 2019
Publication date	Apr 11, 2023
Grant date	Apr 11, 2023

Abstract

The present disclosure relates to a driver for a display device. A driver for a display device according to an embodiment is characterized in generating a voltage supplied as a bias voltage of a source buffer of a data driver in conjunction with a voltage supplied to a display panel. Therefore, the driver for the display device according to the present disclosure has an advantage that the headroom margin of the source buffer can be secured and power consumption of the driver is low at the same time, even when an image data pattern causing a variation in the voltage is input to the display device.

First claim

What is claimed is:

1. A driver for a display device, the driver comprising:
a data driver including a source buffer that outputs a data voltage to a data line of a display panel of the display device; and
a power supply unit supplying a first voltage to a power line of the display panel and a second voltage to the data driver, wherein the power supply unit includes:
a first voltage generator generating the first voltage; and
a second voltage generator generating the second voltage based on the first voltage, in which the second voltage is supplied as a bias voltage of the source buffer,

wherein the second voltage generator multiplies the first voltage by a predetermined number to generate the second voltage or increases the first voltage by a predetermined voltage to generate the second voltage.

2. The driver of claim 1 , wherein the second voltage generator includes an operational amplifier, a first resistor, and a second resistor,
in which the first voltage is applied to a first input terminal of the operational amplifier,
a second input terminal of the operational amplifier is connected to one end of the first resistor and one end of the second resistor,
another end of the first resistor is grounded, and
another end of the second resistor is connected to an output terminal of the operational amplifier.

3. The driver of claim 2 , wherein at least one of the first resistor or the second resistor is a variable resistor.

4. The driver of claim 3 , wherein the power supply unit further includes a controller for adjusting the variable resistor,
wherein the variable resistor is at least one of the first resistor and the second resistor.

Assignees

• Lg Display Co Ltd

Inventors

• Kang Jeongho

Classifications

• G09G3/20 Primary

  for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix {no fixed position being assigned to or needed to be assigned to the individual characters or partial characters} · CPC title

• G09G2310/0264

  Details of driving circuits · CPC title

• G09G3/3225 Primary

  using an active matrix · CPC title

• G09G2310/0291

  Details of output amplifiers or buffers arranged for use in a driving circuit · CPC title

• G09G2330/021

  Power management, e.g. power saving · CPC title