Display device and method of driving the same

Patent metadata

Field	Value
Publication number	US-2016189601-A1
Application number	US-201514979983-A
Country	US
Kind code	A1
Filing date	Dec 28, 2015
Priority date	Dec 26, 2014
Publication date	Jun 30, 2016
Grant date	—

Abstract

A disclosed display device includes a data driver configured to receive data signals corresponding to an input image and to output a first data signal corresponding to a first portion of the input image to be displayed. The display device also includes a display panel having a plurality of data lines and a display area configured to display the first portion of the input image based on the first data signal from the data driver. The data driver is further configured to cut off a second data signal corresponding to a second portion of the input image substantially outside the display area of the display panel from being output.

First claim

What is claimed is:

1 . A display device, comprising:
a display panel having a plurality of data lines and a display area configured to display a first portion of an input image; a source amplifier having a plurality of amplifiers, and configured to receive a first data signal corresponding to the first portion of the input image and a second data signal corresponding to a second portion of the input image outside the display area, to amplify and output the first data signal, and to cut off the second data signal from being output; and a source amplifier control circuit configured to control the source amplifier to output the amplified first data signal and to cut off the second data signal from being output, wherein the display panel is configured to display the first portion of the input image based on the amplified first data signal.

2 . The display device of claim 1 , wherein the source amplifier control circuit is configured to control the source amplifier to float or turn off one of the amplifiers receiving the second data signal and to activate another one of the amplifiers receiving the first data signal to amplify the first data signal.

3 . The display device of claim 2 , wherein the amplifiers are divided into a plurality of groups, each group having one or more amplifiers, and
wherein the source amplifier control circuit is configured to control the amplifiers on a group by group basis so that the one or more amplifiers in a group are activated or turned off together.

4 . The display device of claim 1 , wherein the source amplifier further includes:
an output terminal configured to output either the amplified first data signal or a blank signal for a corresponding one of the data lines; an output OFF switch having a switch electrode connected to the source amplifier control circuit, a first electrode connected to a low supply voltage terminal, and a second electrode connected to the output terminal; and an output ON switch having a switch electrode connected to the source amplifier control circuit, a first electrode connected to an output of a corresponding one of the amplifiers, and a second electrode connected to the output terminal, wherein when the corresponding one of the amplifiers receives the first data signal, the source amplifier control circuit activates the output ON switch to supply the amplified first data signal to the output terminal, and when the corresponding one of the amplifiers receives the second data signal, the source amplifier control circuit activates the output OFF switch to supply the low supply voltage representing the blank signal to the output terminal.

5 . A display device, comprising:
a data driver configured to receive data signals corresponding to an input image and to output a first data signal corresponding to a first portion of the input image to be displayed; and a display panel having a plurality of data lines and a display area configured to display the first portion of the input image based on the first data signal from the data driver, wherein the data driver is further configured to cut off a second data signal corresponding to a second portion of the input image substantially outside the display area of the display panel from being output.

6 . The display device of claim 5 , further comprising:
a display area control circuit configured to analyze the input image to calculate the first portion of the input image to be displayed on the display panel, and to supply to the data driver an output cutoff signal for cutting off the second data signal from being output to the display panel based on the calculation of the first portion of the input image.

7 . The display device of claim 6 , wherein the data driver comprises:
a source amplifier including a plurality of amplifiers, and configured to receive the first data signal and the second data signal, to amplify and output the first data signal, and to cut off the second data signal from being output; and a source amplifier control circuit configured to control the source amplifier to output the amplified first data signal and to cut off the second data signal from being output based on the output cutoff signal.

8 . The display device of claim 7 , wherein the source amplifier control circuit is configured to control the source amplifier to float or turn off one of the amplifiers receiving the second data signal based on the output cutoff signal and to activate another one of the amplifiers receiving the first data signal to amplify the first data signal.

9 . The display device of claim 8 , wherein the amplifiers are divided into a plurality of groups, each group having one or more amplifiers, and
wherein the source amplifier control circuit is configured to control the amplifiers on a group by group basis so that the one or more amplifiers in a group are activated or turned off together.

10 . The display device of claim 7 , wherein the source amplifier further includes:
an output terminal configured to output either the amplified first data signal or a blank signal for a corresponding one of the data lines; an output OFF switch having a switch electrode connected to the source amplifier control circuit, a first electrode connected to a low supply voltage terminal, and a second electrode connected to the output terminal; and an output ON switch having a switch electrode connected to the source amplifier control circuit, a first electrode connected to an output of a corresponding one of the amplifiers, and a second electrode connected to the output terminal, wherein when the corresponding one of the amplifiers receives the first data signal, the source amplifier control circuit activates the output ON switch to supply the amplified first data signal to the output terminal, and when the corresponding one of the amplifiers receives the second data signal, the source amplifier control circuit activates the output OFF switch based on the output cutoff signal to supply the low supply voltage representing the blank signal to the output terminal.

11 . The display device of claim 6 , further comprising:
a memory configured to store a frame data representing a frame of the input image; and a timing controller configured to receive the frame data, and to output the data signals and timing control signals to the data driver.

12 . The display device of claim 11 , wherein the memory is a static random access memory.

13 . The display device of claim 6 , wherein the data driver comprises:
a digital to analog conversion circuit configured to receive the output cutoff signal, a first digital data signal corresponding to the first portion of the input image, and the second data signal, to covert the first digital data signal to the first data signal, to output the first data signal, and to cut off the second data signal from being output, wherein in the first data signal is in a form of an analog voltage.

14 . The display device of claim 5 , wherein the display area has a circular or oval shape.

15 . The display device of claim 5 , wherein the display panel has a display screen larger than the display area, and the display area is a window area in the display screen,
wherein the display panel is configured to display the input image substantially only in the window area in a first mode and to display the input image in substantially the entire display screen on a second mode.

16 . The display device of claim 15 , wherein the first mode is a power saving mode, and the second mode is a normal operating mode.

17 . The display device of c

Assignees

• Lg Display Co Ltd

Inventors

• Jung Jeahun
• Eom Euncheol
• Park Subin

Classifications

• G09G2330/021

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

• 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

• G09G2360/16

  Calculation or use of calculated indices related to luminance levels in display data · CPC title

• G09G2310/0291

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

• G09G2310/0232

  Special driving of display border areas · CPC title