Display apparatus and method of driving the same

Patent metadata

Field	Value
Publication number	US-2016343286-A1
Application number	US-201615225795-A
Country	US
Kind code	A1
Filing date	Aug 1, 2016
Priority date	Mar 15, 2012
Publication date	Nov 24, 2016
Grant date	—

Abstract

A display apparatus includes a display panel and a backlight unit. The display panel includes a first substrate and a second substrate. The first substrate includes a first base substrate and a wavelength transforming member. The wavelength transforming member is formed on a first surface of the first base substrate to change a wavelength of light to emit visible light having a predetermined wavelength. The second substrate includes a second base substrate and a light shutter member. The second base substrate faces the first base substrate. The light shutter member is formed on a first surface of the second base substrate facing the first surface of the first base substrate. The light shutter member controls light transmittance of the light received from the wavelength transforming member. The backlight unit provides the display panel with the light. Thus, color purity of image is increased, thereby improving image display quality.

First claim

What is claimed is:

1 . A display apparatus, comprising:
a backlight unit configured to provide light, the back light unit comprising a first light source and a second light source; and a display panel comprising: a first substrate comprising a first base substrate and a wavelength transforming member, the wavelength transforming member being formed on a first surface of the first base substrate to change a wavelength of the provided light to emit the provided light having a determined wavelength; and a second substrate comprising a second base substrate and a light shutter member, the second base substrate facing the first base substrate, the light shutter member being disposed between a first surface of the second base substrate and the first surface of the first base substrate, the light shutter member being configured to control light transmittance of the provided light received from the wavelength transforming member, wherein the wavelength transforming member further comprises: is a first wavelength transforming member to transform the wavelength of the provided light to emit a first light; a second wavelength transforming member to transform the wavelength of the provided light to emit a second light; and a third wavelength transforming member to transform the wavelength of the provided light to emit a third light, wherein the first light source is configured to radiate visible light and the second light source is configured to be turned off in association with control of the light shutter member to transmit either the first light or the second light, and wherein the second light source is configured to radiate blue light and the first light source is configured to be turned off in association with control of the light shutter member to transmit the third light.

2 . The display apparatus of claim 1 , wherein the light shutter member comprises a liquid crystal element.

3 . The display apparatus of claim 1 , wherein the light shutter member comprises a microelectromechanical system (MEMS).

4 . The display apparatus of claim 1 , wherein the first substrate further comprises:
a light blocking pattern formed on the first surface of the first base substrate, the light blocking pattern comprising an opening hole; and a spacing member formed on the light blocking pattern to form a space to dispose the wavelength transforming member.

5 . The display apparatus of claim 1 , wherein the wavelength transforming member comprises at least one material selected from the group consisting of a fluorescent material and a color transforming material.

6 . The display apparatus of claim 1 , wherein the second substrate further comprises an ultraviolet light blocking layer on a second surface of the second base substrate, the second surface being opposite to the first surface of the second base substrate, and the ultraviolet light blocking layer being configured to absorb an ultraviolet light.

7 . The display apparatus of claim 1 , wherein the first and second wavelength transforming members are configured to transform a wavelength of the light emitted from the first light source to provide the second base substrate with the first light received from the first wavelength transforming member and the second light received from the second wavelength transforming member, and
wherein the third wavelength transforming member is configured to transform a wavelength of the blue light emitted from the second light source to provide the second base substrate with the third light received from the third wavelength transforming member.

8 . The display apparatus of claim 7 , wherein the light emitted from the first light source comprises different colors from the first and second lights emitted from the first wavelength transforming member and the second wavelength transforming member, and
wherein the light emitted from the second light source comprises substantially the same color as the third light emitted from the third wavelength transforming member.

9 . The display apparatus of claim 8 , wherein the first wavelength transforming member is configured to emit red light, the second wavelength transforming member is configured to emit green light, and the third wavelength transforming member is configured to emit blue light based on the light emitted from the first light source or the light emitted from the second light source.

10 . The display apparatus of claim 1 , wherein the backlight unit further comprises a light guiding plate comprising:
a light incident surface to receive the lights generated from the light source part; and a light exiting surface to guide the lights exiting from the light guiding plate towards the display panel.

11 . The display apparatus of claim 1 , wherein the wavelength transforming member comprises at least one material selected from the group consisting of fluorescent material and color transforming material.

12 . The display apparatus of claim 1 , further comprising an ultraviolet light blocking layer on a second surface of the second base substrate, the second surface of the second base substrate being opposite to the first surface of the second base substrate, and a transflective layer being configured to absorb an ultraviolet light.

13 . The display apparatus of claim 1 , wherein a first substrate further comprises a transflective layer, and
wherein the transflective layer is disposed on a second surface of the first base substrate, the second surface of the first base substrate being opposite to the first surface of the first base substrate, and the transflective layer being configured to pass an ultraviolet light and blue light of the provided light and to reflect red light and green light from the wavelength transforming member.

14 . A method of driving a display apparatus comprising a display panel and a backlight unit, the method comprising:
time-dividing a frame into a plurality of sub frames comprising a first sub frame, a second sub frame, and a third sub frame; time-dividing the received data into first data, second data, and third data corresponding to the sub frames, and providing a data driving part with the first data, the second data, and the third data; sequentially applying a scan pulse to a plurality of gate lines during a scan period, the scan pulse selecting a horizontal line receiving the time-divided data during each of the sub frames, the sub frames corresponding to a plurality of sub pixels of the display panel, the plurality of sub pixels comprising a first sub pixel, a second sub pixel, and a third sub pixel configured to emit light having different wavelengths; driving a light shutter member of each of the sub pixels to control light transmittance of the light shutter member; driving, after the scan period, a first light source of the backlight unit to generate a first light and turning off the second light source during the first sub frame and the second sub frame, and; driving, after the scan period, a second light source of the backlight unit to generate a second light and turning off the first light source during the third sub frame, wherein the second light has a different wavelength than the first light.

15 . The method of claim 14 , wherein the light shutter member comprises a liquid crystal element.

16 . The method of claim 14 , wherein the light shutter member comprises microelectromechanical systems (MEMS).

17 . The method of claim 14 , further comprising:
transforming a wavelength of the first light; providing the transformed first light to the second base substrate; tr

Assignees

• Samsung Display Co Ltd

Inventors

• Park Hae-Il
• Park Jae-Byung

Classifications

• G02F1/133617 Primary

  Illumination with ultraviolet light; Luminescent elements or materials associated to the cell · CPC title

• G02B6/005

  provided by one optical element, or plurality thereof, placed on the light output side of the light guide · CPC title

• G02F1/1339

  Gaskets; Spacers; Sealing of cells · CPC title

• G02B6/0068

  Arrangements of plural sources, e.g. multi-colour light sources · CPC title

• G09G3/3413

  Details of control of colour illumination sources · CPC title