Liquid crystal display device

• US 9,412,334 B2
• Filed: 02/27/2015
• Issued: 08/09/2016
• Est. Priority Date: 07/19/2011
• Status: Active Grant

• Current Assignee: Japan Display Incorporated
• Original Assignee: Japan Display Incorporated
• Inventors: Watakabe, Hajime, Ishida, Arichika, Hiramatsu, Masato
• Primary Examiner(s): Caley, Michael
• Assistant Examiner(s): LAU, EDMOND C
• Application Number:
  US14/633,997
• Publication Number:
  US 20150170605A1
• Time in Patent Office: 529 Days
• US Class Current: 1/1
• CPC Class Codes: G02F 1/133514 Colour filters
• CPC Class Codes: G02F 1/133521 Interference filters
• CPC Class Codes: G02F 1/136209 Light shielding layers, e.g. black matrix, incorporated in the active matrix substrate, e.g. structurally associated with the switching element
• CPC Class Codes: G02F 1/136222 Colour filters incorporated in the active matrix substrate
• CPC Class Codes: G02F 2201/346 distributed (Bragg) reflector
• CPC Class Codes: G02F 2202/104 poly-Si
• CPC Class Codes: G09G 3/3607 for displaying colours or for displaying grey scales with a specific pixel layout, e.g. using sub-pixels display of colours in flat matrix panels other than liquid crystal displays G09G3/2003; grey scales specific for television H04N3/127
• CPC Class Codes: G09G 5/02 characterised by the way in which colour is displayed details of colour display specific for CRTs G09G1/28; specific for flat matrix panels other than liquid crystal displays G09G3/2003; specific for liquid crystal displays G09G3/3607

Abstract

According to one embodiment, a liquid crystal display device includes an array substrate including a first color filter configured to transmit light in a first wavelength range, a second color filter configured to transmit light in a second wavelength range of greater wavelengths than the first wavelength range, a first switching element disposed above the second color filter, a second switching element disposed above the second color filter, a first pixel electrode which is electrically connected to the first switching element and is located above the first color filter, and a second pixel electrode which is electrically connected to the second switching element and is located above the second color filter.

Claims

1. A liquid crystal display device comprising an array substrate comprising:

a gate line;

a first source line and a second source line which cross the gate line;

a first color filter configured to transmit light in a first wavelength range;

a second color filter configured to transmit light in a second wavelength range of greater than the first wavelength range;

a first switching element electrically connected to the gate line and the first source line;

a second switching element electrically connected to the gate line and the second source line;

a first pixel electrode which is electrically connected to the first switching element and is located to overlap with the first color filter; and

a second pixel electrode which is electrically connected to the second switching element and is located to overlap with the second color filter,

wherein the first switching element includes a first gate electrode, a first semiconductor layer, and a first region at which the first gate electrode and the first semiconductor layer is overlapped,

the second switching element includes a second gate electrode, a second semiconductor layer, and a second region at which the second gate electrode and the second semiconductor layer is overlapped, and

the first region and the second region are overlapped with the second color filter.

2. The liquid crystal display device of claim 1, wherein the first wavelength range is a blue wavelength range.

3. The liquid crystal display device of claim 1, further comprising a backlight located on a back side of the array substrate,

wherein a light emission spectrum of the backlight has a light emission peak at least in the first wavelength range.

4. The liquid crystal display device of claim 1, wherein the first semiconductor layer and the second semiconductor layer are formed of polysilicon or amorphous silicon.

5. A liquid crystal display device comprising an array substrate comprising:

a gate line;

a first source line and a second source line which cross the gate line;

a first color filter configured to transmit light in a first wavelength range;

a second color filter configured to transmit light in a second wavelength range of greater than the first wavelength range;

a first switching element electrically connected to the gate line and the first source line;

a second switching element electrically connected to the gate line and the second source line;

a first pixel electrode which is electrically connected to the first switching element and is located to overlap with the first color filter; and

a second pixel electrode which is electrically connected to the second switching element and is located to overlap with the second color filter,

wherein the first switching element includes a first gate electrode, a first semiconductor layer, and a first region at which the first gate electrode and the first semiconductor layer is overlapped,

the second switching element includes a second gate electrode, a second semiconductor layer, and a second region at which the second gate electrode and the second semiconductor layer is overlapped,

the first region is located between the first gate electrode and the second color filter, and

the second region is located between the second gate electrode and the second color filter.

6. The liquid crystal display device of claim 5, wherein the first wavelength range is a blue wavelength range.

7. The liquid crystal display device of claim 5, further comprising a backlight located on a back side of the array substrate,

wherein a light emission spectrum of the backlight has a light emission peak at least in the first wavelength range.

8. The liquid crystal display device of claim 5, wherein the first semiconductor layer and the second semiconductor layer are formed of polysilicon or amorphous silicon.

9. A liquid crystal display device comprising an array substrate comprising:

a gate line;

a first source line and a second source line which cross the gate line;

a first pixel which displays a first color; and

a second pixel which displays a second color different from the first color;

wherein the first pixel includes a first color filter with a first film thickness, a second color filter with a second film thickness which is different from the first film thickness, a first switching element which is electrically connected to the gate line and the first source line, and a first pixel electrode which is electrically connected to the first switching element and is located to overlap with the first color filter,

the first switching element includes a first gate electrode, a first semiconductor layer, and a first region at which the first gate electrode and the first semiconductor layer is overlapped,

the first region is overlapped with the second color filter,

the first color filter is configured to transmit the first color,

the second color filter is configured to transmit a third color which is different from the first color and the second color,

the second pixel includes a third color filter with a third film thickness which is different from the first film thickness and the second film thickness, a fourth color filter with the second film thickness, a second switching element which is electrically connected to the gate line and the second source line, and a second pixel electrode which is electrically connected to the second switching element and is located to overlap with the third color filter,

the second switching element includes a second gate electrode, a second semiconductor layer, and a second region at which the second gate electrode and the second semiconductor layer is overlapped,

the second region is overlapped with the fourth color filter,

the third color filter is configured to transmit the second color, and

the fourth color filter is configured to transmit the third color.

10. The liquid crystal display device of claim 9, wherein the first color is blue.

11. The liquid crystal display device of claim 9, further comprising a backlight located on a back side of the array substrate,

wherein a light emission spectrum of the backlight has a light emission peak at least in the first color.

12. The liquid crystal display device of claim 9, wherein the first semiconductor layer and the second semiconductor layer are formed of polysilicon or amorphous silicon.