DISPLAY DEVICE AND METHOD OF MANUFACTURING THEREOF

• US 20170179439A1
• Filed: 12/10/2015
• Published: 06/22/2017
• Est. Priority Date: 06/29/2015
• Status: Active Grant

• Current Assignee: BOE Technology Group Co., Ltd.
• Original Assignee: BOE Technology Group Co., Ltd.
• Inventors: Tian, Yunyun, Choi, Hyun Sic
• Granted Patent: US 10,096,801 B2
• Time in Patent Office: Days
• CPC Class Codes: G02B 5/3016 involving passive liquid crystal elements optical properties of liquid crystals G02F1/0063; polarising elements associated with active liquid crystal devices G02F1/133528
• CPC Class Codes: G02F 1/13338 Input devices, e.g. touch panels
• CPC Class Codes: G02F 1/133528 Polarisers
• CPC Class Codes: G02F 1/13363 Birefringent elements, e.g. for optical compensation
• CPC Class Codes: G02F 1/133638 Waveplates, i.e. plates with a retardation value of lambda/n
• 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 1/136286 Wiring, e.g. gate line, drain line
• CPC Class Codes: G02F 1/136295 Materials; Compositions; Manufacture processes
• CPC Class Codes: G02F 2413/02 Number of plates being 2
• CPC Class Codes: H01L 27/12 the substrate being other than a semiconductor body, e.g. an insulating body
• CPC Class Codes: H01L 27/1218 with a particular composition or structure of the substrate
• CPC Class Codes: H01L 29/78633 with a light shield
• CPC Class Codes: H10K 50/856 comprising reflective means
• CPC Class Codes: H10K 50/865 comprising light absorbing layers, e.g. light-blocking layers
• CPC Class Codes: H10K 59/1201 Manufacture or treatment
• CPC Class Codes: H10K 59/121 characterised by the geometry or disposition of pixel elements
• CPC Class Codes: H10K 59/1213 the pixel elements being TFTs
• CPC Class Codes: H10K 59/126 Shielding, e.g. light-blocking means over the TFTs
• CPC Class Codes: H10K 59/131 Interconnections, e.g. wiring lines or terminals
• CPC Class Codes: H10K 59/50 OLEDs integrated with light modulating elements, e.g. with electrochromic elements, photochromic elements or liquid crystal elements
• CPC Class Codes: H10K 59/878 : comprising reflective means
• CPC Class Codes: H10K 59/8792 : comprising light absorbing layers, e.g. black layers

Abstract

The present application discloses a display device having a metal pattern on a substrate of a display device and a light absorbing layer positioned to absorb light reflected by the metal pattern, and a manufacturing method thereof. The light absorbing layer has a pattern corresponding to at least a portion of the metal pattern.

Claims

1. A display device, comprising:

a metal pattern on a first substrate of a display device;

a first light absorbing layer positioned to absorb light reflected by the metal pattern;

a first quarter wave plate; and

a first half wave plate;

wherein the first light absorbing layer has a pattern corresponding to at least a portion of the metal pattern; and

the first quarter wave plate and the first half wave plate are so positioned that light reflected by the metal pattern passes through the first quarter wave plate and the first half wave plate in a sequential order before it is absorbed by the first light absorbing layer, wherein the first substrate is a substrate proximal to a first light emitting surface of the display device for image display.

3. The display device of claim 1, wherein the metal pattern, the first quarter wave plate, the first half wave plate, and the first light absorbing layer are sequentially arranged on the first substrate along a direction away from the first substrate.

4. The display device of claim 1, wherein the first light absorbing layer, the first half wave plate, the first quarter wave plate, and the metal pattern are sequentially arranged on the first substrate along a direction away from the first substrate.

5. The display device of claim 1, wherein the first light absorbing layer comprises a mixture comprising polymer liquid crystal molecules and dichroic dye molecules, the total weight percentage of the polymer liquid crystal molecules in the mixture is in the range of 60% to 98%, the total weight percentage of the dichroic dye molecules in the mixture is in the range of 2% to 40%, or the weight ratio of the polymer liquid crystal molecules to the dichroic dye molecules in the mixture is in the range of 3:

2 to 49;

1.

6. The display device of claim 3, wherein thickness of the first light absorbing layer is d, wherein d=kλ

/σ

, k is an integer, λ

is wavelength of an incident light reflected by the metal pattern, and σ

is refractive index of the first light absorbing layer.

7. The display device of claim 1, further comprising:

a second substrate facing the first substrate;

a second light absorbing layer positioned to absorb light reflected by the metal pattern;

a second quarter wave plate; and

a second half wave plate;

wherein the second light absorbing layer has a pattern corresponding to at least a portion of the metal pattern;

wherein the second quarter wave plate and the second half wave plate are so positioned that light reflected by the second metal pattern passes through the second quarter wave plate and the second half wave plate in a sequential order before it is absorbed by the second light absorbing layer, wherein the second substrate is a substrate proximal to a second light emitting surface of the display device for image display.

8. The display device of claim 7, wherein the first light absorbing layer, the first half wave plate, the first quarter wave plate, the metal pattern, the second quarter wave plate, the second half wave plate, the second light absorbing layer, and the second substrate are sequentially arranged on the first substrate along a direction away from the first substrate.

9. The display device of claim 1, wherein the first light absorbing layer is a polarizer.

10. The display device of claim 1, wherein the display device is an organic electroluminescence display device comprising an organic light emitting diode, the organic light emitting diode is connected to a switching transistor and comprises a transparent electrode.

11. The display device of claim 1, wherein the metal pattern comprising one or more of the following:

a gate line metal pattern, a data line metal pattern, a source/drain electrode metal pattern, and a touch electrode metal pattern.

2. (canceled)

12. A method of manufacturing a display device, comprising:

forming a metal pattern on a first substrate; and

forming a light absorbing layer on the first substrate, wherein the light absorbing layer has a pattern corresponding to at least a portion of the metal pattern;

wherein the step of forming the light absorbing layer on the first substrate is performed prior to the step of forming a metal pattern on the first substrate so that the metal pattern is formed on top of the light absorbing layer.

14. The method of claim 12, subsequent to the step of forming the light absorbing layer, and prior to the step of forming the metal pattern, further comprising sequentially forming a half wave plate layer and a quarter wave plate layer on top of the light absorbing layer;

wherein the half wave plate layer and the quarter wave plate layer are so positioned that light reflected by the metal pattern passes through the quarter wave plate layer and the half wave plate layer in a sequential order before it is absorbed by the light absorbing layer.

15. The method of claim 12, wherein the step of forming the light absorbing layer on the first substrate is performed subsequent to the step of forming a metal pattern on the first substrate so that the light absorbing layer is formed on top of the metal pattern.

16. The method of claim 15, subsequent to the step of forming the metal pattern and prior to the step of forming the light absorbing layer on the first substrate, further comprising sequentially forming a quarter wave plate layer and a half wave plate layer on top of the metal pattern;

wherein the quarter wave plate layer and the half wave plate layer are so positioned that light reflected by the metal pattern passes through the quarter wave plate layer and the half wave plate layer in a sequential order before it is absorbed by the light absorbing layer.

17. The method of claim 12, wherein the light absorbing layer comprises a mixture comprising polymer liquid crystal molecules and dichroic dye molecules, the total weight percentage of the polymer liquid crystal molecules in the mixture is in the range of 60% to 98%, the total weight percentage of the dichroic dye molecules in the mixture is in the range of 2% to 40%, or the weight ratio of the polymer liquid crystal molecules to the dichroic dye molecules in the mixture is in the range of 3:

2 to 49;

1.

18. The method of claim 17, wherein thickness of the light absorbing layer is d, wherein d=kλ

/σ

, k is an integer, λ

is the wavelength of the light reflected by the metal pattern and transmitted into the light absorbing layer, and σ

is the refractive index of the light absorbing layer.

20. The method of claim 12, wherein the display device is an organic electroluminescence display device, the method further comprising forming an organic light emitting diode on the first substrate comprising the metal pattern;

wherein the organic light emitting diode is connected to a switching transistor, and comprises a transparent electrode.

22. The method of claim 18, wherein the light absorbing layer is a polarizer.

13. (canceled)

19. (canceled)

21. A method of manufacturing a display device, comprising:

forming a first light absorbing layer on top of a first substrate;

sequentially forming a first half wave plate layer and a first quarter wave plate layer on top of the first light absorbing layer;

forming a metal pattern on the first quarter wave plate layer;

sequentially forming a second quarter wave plate layer and a second half wave plate layer on the metal pattern; and

forming a second light absorbing layer on the second half wave plate layer.