Liquid crystal display device having wire grid polarizer and #two display structures and method of forming the same

• US 10,564,469 B2
• Filed: 03/19/2018
• Issued: 02/18/2020
• Est. Priority Date: 03/19/2018
• Status: Active Grant

• Current Assignee: A.U. Vista Inc. (AUO Corp.)
• Original Assignee: A.U. Vista Inc. (AUO Corp.)
• Inventors: Luo, Fang-Chen, Lee, Seok-Lyul
• Primary Examiner(s): Nguyen, Lauren
• Application Number:
  US15/925,024
• Publication Number:
  US 20190285936A1
• Time in Patent Office: 701 Days
• CPC Class Codes: G02B 5/3058 comprising electrically conductive elements, e.g. wire grids, conductive particles
• CPC Class Codes: G02F 1/1334 based on polymer dispersed liquid crystals, e.g. microencapsulated liquid crystals
• CPC Class Codes: G02F 1/133512 Light shielding layers, e.g. black matrix G02F1/136209 takes precedence
• CPC Class Codes: G02F 1/133514 Colour filters
• CPC Class Codes: G02F 1/133528 Polarisers
• CPC Class Codes: G02F 1/133548 Wire-grid polarisers
• CPC Class Codes: G02F 1/133565 inside the LC elements, i.e. between the cell substrates
• CPC Class Codes: G02F 1/13476 in which at least one liquid crystal cell or layer assumes a scattering state
• CPC Class Codes: G02F 1/136286 Wiring, e.g. gate line, drain line
• CPC Class Codes: G02F 1/1368 in which the switching element is a three-electrode device G02F1/136277 takes precedence
• CPC Class Codes: G02F 2201/121 common or background
• CPC Class Codes: G02F 2201/123 pixel
• CPC Class Codes: H01L 27/1225 with semiconductor materials not belonging to the group IV of the periodic table, e.g. InGaZnO
• CPC Class Codes: H01L 27/124 with a particular composition, shape or layout of the wiring layers specially adapted to the circuit arrangement, e.g. scanning lines in LCD pixel circuits wiring structures per se H01L23/52
• CPC Class Codes: H01L 27/1251 comprising TFTs having a different architecture, e.g. top- and bottom gate TFTs
• CPC Class Codes: H01L 27/1262 with a particular formation, treatment or coating of the substrate

Abstract

A display cell structure is provided. A first substrate and a second substrate are spaced apart from each other, and a wire grid polarizer layer is disposed therebetween, forming a first cell gap between the first substrate and the wire grid polarizer layer and a second cell gap between the second substrate and the wire grid polarizer layer. A first display structure is disposed in the first cell gap, and includes multiple first pixel electrodes and a polymer liquid crystal layer. A polarizer layer is disposed on the second substrate and facing an opposite side to the wire grid polarizer layer. A second display structure is disposed in the second cell gap, and includes multiple second pixel electrodes and a liquid crystal layer.

Claims

1. A display cell structure, comprising:

a first substrate and a second substrate spaced apart from each other;

a wire grid polarizer layer disposed between the first substrate and the second substrate, forming a first cell gap between the first substrate and the wire grid polarizer layer and a second cell gap between the second substrate and the wire grid polarizer layer;

a common electrode layer disposed between the first substrate and the second substrate, wherein the wire grid polarizer layer is directly disposed on the common electrode layer;

a first display structure disposed in the first cell gap between the first substrate and the wire grid polarizer layer, the first display structure comprising;

a plurality of first pixel electrodes disposed on the first substrate and facing the wire grid polarizer layer; and

a polymer liquid crystal layer disposed in the first cell gap between the first substrate and the wire grid polarizer layer;

a polarizer layer disposed on the second substrate and facing an opposite side to the wire grid polarizer layer; and

a second display structure disposed in the second cell gap between the second substrate and the wire grid polarizer layer, the second display structure comprising;

a plurality of second pixel electrodes disposed on the second substrate and facing the wire grid polarizer layer; and

a liquid crystal layer disposed in the second cell gap between the second substrate and the wire grid polarizer layer,

wherein the common electrode layer functions as a shared common electrode for both the first display structure and the second display structure.

2. The display cell structure of claim 1, wherein the wire grid polarizer layer is disposed on the common electrode layer and facing the second display structure.

3. The display cell structure of claim 1, wherein the wire grid polarizer layer is formed by a low resistivity material to function as a common electrode, and wherein the low resistivity material has an electrical resistivity smaller than 10⁻

7 Ω

·

m.

4. The display cell structure of claim 3, wherein the low resistivity material is selected from the group consisting of aluminum (Al), Molybdenum (Mo), Tungsten (W), or a combination thereof.

5. The display cell structure of claim 1, wherein a thickness of the wire grid polarizer layer is 80-120 nm.

6. The display cell structure of claim 1, wherein the second display structure is in a vertically-aligned (VA) mode or a twisted nematic (TN) mode.

7. The display cell structure of claim 1, wherein the first display structure and the second display structure correspondingly define a plurality of pixels, and for each of the pixels, in a first operational mode, the first display structure is configured to switch to a transparent state, and in a second operational mode, the first display structure is configured to switch to a substantially opaque state.

8. The display cell structure of claim 7, wherein for each of the pixels, in the first operational mode, the first pixel electrode corresponding to the pixel is provided with a voltage difference, such that the first display structure is configured to switch to the transparent state, and in the second operational mode, the first pixel electrode corresponding to the pixel is not provided with the voltage difference, such that the first display structure is configured to switch to the substantially opaque state.

9. The display cell structure of claim 1, wherein the first display structure and the second display structure correspondingly define a plurality of pixels, and for each of the pixels, the second display structure comprises a plurality of color filters disposed on the second substrate, wherein each of the second pixel electrodes corresponds to one of the color filters to form a sub-pixel.

10. The display cell structure of claim 9, wherein for each of the sub-pixels, the first display structure further comprises:

a first transistor electrically connected to a corresponding one of the first pixel electrodes, each of the first transistors comprising;

a first semiconductor layer disposed on the first substrate;

a first gate insulating layer disposed on the first semiconductor layer;

a first gate electrode disposed on the first gate insulating layer;

a first source electrode and a first drain electrode disposed on the first semiconductor layer and insulated from the first gate electrode,

wherein the first drain electrode is electrically connected to the corresponding one of the first pixel electrodes; and

a first black matrix layer disposed between the first transistor and on the first substrate.

11. The display cell structure of claim 10, wherein for each of the sub-pixels, the second display structure further comprises:

a second transistor electrically connected to a corresponding one of the second pixel electrodes, each of the second transistors comprising;

a second semiconductor layer disposed on the second substrate;

a second gate insulating layer disposed on the second semiconductor layer;

a second gate electrode disposed on the second gate insulating layer;

a second source electrode and a second drain electrode disposed on the second semiconductor layer and insulated from the second gate electrode, wherein the second drain electrode is electrically connected to the corresponding one of the second pixel electrodes; and

a second black matrix layer disposed between the second transistor and on the second substrate, and between the color filters.

12. The display cell structure of claim 1, wherein the first display structure further comprises a plurality of reference electrodes disposed on the first substrate and facing the wire grid polarizer layer, and the first pixel electrodes and the reference electrodes are alternately disposed on the first substrate.

13. A display cell structure, comprising:

a first substrate and a second substrate spaced apart from each other;

a wire grid polarizer layer disposed between the first substrate and the second substrate, forming a first cell gap between the first substrate and the wire grid polarizer layer and a second cell gap between the second substrate and the wire grid polarizer layer;

a first display structure disposed in the first cell gap between the first substrate and the wire grid polarizer layer, the first display structure comprising;

a plurality of first pixel electrodes disposed on the first substrate and facing the wire grid polarizer layer; and

a polymer liquid crystal layer disposed in the first cell gap between the first substrate and the wire grid polarizer layer;

a common electrode layer disposed between the first substrate and the second substrate, wherein the wire grid polarizer layer is disposed on the common electrode layer and facing the second display structure;

a polarizer layer disposed on the second substrate and facing an opposite side to the wire grid polarizer layer; and

a second display structure disposed in the second cell gap between the second substrate and the wire grid polarizer layer, the second display structure comprising;

a plurality of second pixel electrodes disposed on the second substrate and facing the wire grid polarizer layer; and

a liquid crystal layer disposed in the second cell gap between the second substrate and the wire grid polarizer layer,

wherein there are only the wire grid polarizer layer and the common electrode layer between the first display structure and the second display structure.

14. The display cell structure of claim 13, wherein the common electrode layer is formed by indium tin oxide.

15. The display cell structure of claim 13, wherein the wire grid polarizer layer is formed by a low resistivity material to function as a common electrode, and wherein the low resistivity material has an electrical resistivity smaller than 10⁻

7 Ω

·

m.

16. The display cell structure of claim 13, wherein a thickness of the wire grid polarizer layer is 80-120 nm.