Display apparatus

Patent metadata

Field	Value
Publication number	US-9454936-B2
Application number	US-201313975154-A
Country	US
Kind code	B2
Filing date	Aug 23, 2013
Priority date	Mar 12, 2013
Publication date	Sep 27, 2016
Grant date	Sep 27, 2016

Abstract

A display apparatus is provided. The display apparatus includes a first light source unit comprising a first light source that emits light having a first spectral band and a photo-converter that converts the light having the first spectral band to a first color light. A spectral band of the first color light is different from the first spectral band of the light emitted from the first light source. The display apparatus also includes a second light source unit comprising a second light source that emits light having a second spectral band. The light having the second spectral band corresponds to a second color light, and has a same color as the light having the first spectral band. A spectral band of the second color light is different from the spectral band of the first color light.

First claim

What is claimed is:

1. A display apparatus comprising:
a display panel configured to display an image in a unit of frame and including a plurality of pixels, each of the plurality of pixels essentially consisting of first, second and third sub-pixels respectively corresponding to a first color filter, a second color filter, and an open portion having no color filter, wherein the frame is divided into a first sub-field and a second sub-field timely separated from the first sub-field;
a first light source unit disposed at a rear surface of the display panel to provide a first color light to the display panel during the first sub-field;
a second light source unit disposed at the rear surface of the display panel to provide a second color light to the display panel during the second sub-field; and
a controller configured to turn-on the first light source unit and turned off the second light source unit during the first sub-field, and turn-on the second light source unit and turned off the first light source unit during the second sub-field,
wherein the first light source unit comprises a first light source that emits light having a first spectral band and a photo-converter that converts the light having the first spectral band to the first color light, and a spectral band of the first color light is different from the first spectral band of the light,
wherein the second light source unit comprises a second light source that emits light having a second spectral band, the light having the second spectral band corresponds to the second color light, and a spectral band of the second color light is different from the spectral band of the first color light,
wherein the first spectral band and the second spectral band belong to a blue spectral band of light having substantially blue color,
wherein the first spectral band has a first peak wave length and the second spectral band has a second peak wave length which is different from that of the first spectral band, and
wherein the first color filter, the second color filter and the opening portion transmit the first color light during the first sub-field, the opening portion transmits the second color light during the second sub-field, and the first color filter and the second color filter do not transmit the second color light during the second sub-field.

2. The display apparatus of claim 1 , wherein the first, second, and third sub-pixels are independently driven.

3. The display apparatus of claim 2 , wherein the first, second, and third sub-pixels receive the first color light during the first sub-field to display the image, and the third sub-pixel receives the second color light during the second sub-field to display a blue image.

4. The display apparatus of claim 3 , wherein the first color light includes a yellow color light.

5. The display apparatus of claim 3 , wherein the first and second color filters respectively comprise a red color filter and a green color filter.

6. The display apparatus of claim 1 , wherein the photo-converter includes a phosphor or a quantum dot to absorb the light from the first light source and emit the first color light.

7. The display apparatus of claim 6 , wherein the photo-converter receives the light from the first light source and emits a light having a yellow color spectral band.

8. The display apparatus of claim 6 , wherein the photo-converter receives the light from the first light source and emits a light having a red color spectral band and a light having a green color spectral band.

9. The display apparatus of claim 1 , wherein the first spectral band of the light emitted from the first light source is of a shorter wavelength than the second spectral band of the light emitted from the second light source.

10. The display apparatus of claim 9 , wherein the first spectral band of the light emitted from the first light source ranges from about 435 nanometers to about 447 nanometers, and the second spectral band of the light emitted from the second light source ranges from about 448 nanometers to about 460 nanometers.

Assignees

• Samsung Display Co Ltd

Inventors

• Kang Jong Hyuk
• Park Jae Byung
• Kwon Junghyun
• Shin Sungtae
• Lee Dong-Hoon
• Im Hyundeok
• Cho Hyun Min

Classifications

• G09G3/3406 Primary

  Control of illumination source (illumination devices structurally associated with liquid crystal cells G02F1/1336) · CPC title

• G09G3/2025

  the sub-frames having all the same time duration · CPC title

• G09G2300/0456

  with a reflective area and a transmissive area combined in one pixel, such as in transflectance pixels · CPC title

• G09G2300/0452

  Details of colour pixel setup, e.g. pixel composed of a red, a blue and two green components · CPC title

• G09G3/36

  using liquid crystals · CPC title