Liquid crystal display device for dashboard of vehicle

Patent metadata

Field	Value
Publication number	US-9229266-B2
Application number	US-201414554690-A
Country	US
Kind code	B2
Filing date	Nov 26, 2014
Priority date	Nov 29, 2013
Publication date	Jan 5, 2016
Grant date	Jan 5, 2016

Abstract

Disclosed is a liquid crystal display (LCD) device that may include a plurality of pixels; a liquid crystal layer disposed over the plurality of pixels; a red color filter layer disposed over the liquid crystal layer, the red color filter layer including anthraquinone pigment.

First claim

What is claimed is:

1. A liquid crystal display device, comprising:
a liquid crystal display panel including R, G, and B color filter layers to implement R, G, and B colors; and
a backlight having a white light emitting diode (W-LED) on the liquid crystal display panel, the W-LED including a blue light emitting diode (LED) for emitting a blue light and a fluorescence layer on the blue LED to supply a white light to the liquid crystal display panel,
wherein the R-color filter layer includes an anthraquinone pigment having a chemical formula as follows:

and
wherein the fluorescence layer includes a green fluorescence material and a red fluorescence material that are mixed in a ratio of about 1.5:1 to about 2.5:1.

2. The liquid crystal display device of claim 1 , wherein the R-color filter layer includes a photosensitive color resin dispersed with the anthraquinone pigment.

3. The liquid crystal display device of claim 1 , wherein the liquid crystal display panel comprises:
a first substrate and a second substrate having a color filter layer;
a plurality of gate lines and a plurality of data lines formed on the first substrate to define a plurality of pixel regions;
a thin film transistor (TFT) formed in each of the pixel regions;
a common electrode and a pixel electrode formed in each pixel region to form an electric field; and
a liquid crystal layer formed between the first substrate and the second substrate.

4. The liquid crystal display device of claim 1 , wherein a light emitted from the blue LED of the W-LED is absorbed in the fluorescence layer to emit a yellow light, and the yellow light is mixed with the blue light emitted from the blue LED to become the white light.

5. The liquid crystal display device of claim 1 , wherein the green fluorescence material and the red fluorescence material are mixed in a ratio of 2 to 1.

6. The liquid crystal display device of claim 1 , wherein the green fluorescence material and the red fluorescence material are mixed in a ratio of about 1.75:1 to about 2.25:1.

7. The liquid crystal display device of claim 1 , wherein the anthraquinone pigment has a pigment size in a range from about 50 μm to about 150 μm.

8. The liquid crystal display device of claim 7 , wherein the anthraquinone pigment has a pigment size in a range from about 70 μm to about 90 μm.

9. The liquid crystal display device of claim 1 , wherein the R-color filter layer includes an amount of the anthraquinone pigment in a range from about 40 wt % to about 45 wt %.

10. The liquid crystal display device of claim 9 , wherein the R-color filter layer includes an amount of the anthraquinone pigment in a range from about 41 wt % to about 43 wt %.

11. The liquid crystal display device of claim 1 , wherein the backlight comprises:
a light guide plate guiding white light made incident upon being emitted from the W-LED to the liquid crystal display panel;
an optical sheet disposed above the light guide plate to diffuse and condense white light supplied to the liquid crystal display panel; and
a reflective plate disposed below the light guide plate.

12. The liquid crystal display device of claim 11 , wherein the W-LED is disposed on one side or on both sides of the light guide plate.

13. The liquid crystal display device of claim 11 , wherein the W-LED is disposed below the light guide plate.

14. The liquid crystal display device of claim 1 , wherein the W-LED is disposed below the liquid crystal display panel.

Assignees

• Lg Display Co Ltd

Inventors

• Ji Seunghoon
• Lee Mikyung

Classifications

• G02F2202/04

  dye · CPC title

• G02B6/0051

  Diffusing sheet or layer · CPC title

• G02F1/133603

  with LEDs · CPC title

• G03F7/0007

  Filters, e.g. additive colour filters; Components for display devices · CPC title

• G02F1/133514 Primary

  Colour filters · CPC title