Color liquid crystal display panel

• US 9,772,531 B2
• Filed: 12/02/2013
• Issued: 09/26/2017
• Est. Priority Date: 11/28/2013
• Status: Active Grant

• Current Assignee: Shenzhen China Star Optoelectronics Technology Co., Ltd. (TCL Technology Group Corp.)
• Original Assignee: Shenzhen China Star Optoelectronics Technology Co., Ltd. (TCL Technology Group Corp.)
• Inventors: Zhong, Xinhui, Lee, Kuancheng
• Primary Examiner(s): Vu, Phu
• Application Number:
  US14/236,701
• Publication Number:
  US 20160195754A1
• Time in Patent Office: 1,394 Days
• CPC Class Codes: G02F 1/133302 Rigid substrates, e.g. inorganic substrates
• CPC Class Codes: G02F 1/133357 Planarisation layers
• CPC Class Codes: G02F 1/133512 Light shielding layers, e.g. black matrix G02F1/136209 takes precedence
• CPC Class Codes: G02F 1/1337 Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers
• CPC Class Codes: G02F 1/133742 for homeotropic alignment
• CPC Class Codes: G02F 1/1339 Gaskets; Spacers; Sealing of cells
• CPC Class Codes: G02F 1/13394 spacers regularly patterned on the cell subtrate, e.g. walls, pillars G02F1/133377 takes precedence
• CPC Class Codes: G02F 1/13439 characterised by their electrical, optical, physical properties; materials therefor; method of making
• CPC Class Codes: G02F 1/13475 in which at least one liquid crystal cell or layer is doped with a pleochroic dye, e.g. GH-LC cell G02F1/13476 takes precedence
• 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 2202/28 Adhesive materials or arrangements

Abstract

The present invention provides a color liquid crystal display panel, which includes: a plurality of mutually parallel layers of liquid crystal cells (2) and bonding members (8) bonding the plurality of layers of liquid crystal cells (2). Each of the liquid crystal cells (2) includes a thin-film transistor substrate (20), a package substrate (30), and a dye-liquid crystal layer (40) sealed between the thin-film transistor substrate (20) and the package substrate (30). The dye-liquid crystal layer (40) includes a liquid crystal material and a dichroic dye. The dichroic dye of each of the liquid crystal cells (2) absorbs light of a predetermined range of wavelength. The plurality of layers of liquid crystal cells (2) respectively absorbs lights of different ranges of wavelength. The present invention includes a dichroic dye combined in a liquid crystal material in order to use the dichroic dye to absorb light of some colors thereby achieving color displaying without using a conventionally used polarizer and manufacture of a color filter substrate, so that the manufacture cost of and the requirement for backlighting brightness by the liquid crystal display panel can both be reduced.

Claims

1. A color liquid crystal display panel, comprising:

a plurality of mutually parallel layers of liquid crystal cell and bonding members bonding the plurality of layers of liquid crystal cells, each of the liquid crystal cells comprising a thin-film transistor substrate, a package substrate, and a dye-liquid crystal layer sealed between the thin-film transistor substrate and the package substrate, the dye-liquid crystal layer comprising a liquid crystal material and a dichroic dye, the dichroic dye of each of the liquid crystal cells absorbing a light of a predetermined range of wavelength, the plurality of layers of liquid crystal cells respectively absorbing lights of different ranges of wavelength;

wherein for each of the layers of liquid crystal cells, the liquid crystal material comprises liquid crystal molecules and the dichroic dye comprises dichroic dye molecules, the dichroic dye molecules having a molecular structure that is similar to a molecular structure of the liquid crystal molecules and shows absorption of visible light in a condition that a major axis of the dichroic dye molecules is substantially perpendicular to a traveling direction of the visible light, such that the liquid crystal molecules and the dichroic dye molecules are movable in unison with each other between a first state where the major axis of the dichroic dye molecules is substantially parallel to the traveling direction of the light of the predetermined range of wavelength and both the liquid crystal molecules and the dichroic dye molecules allow the light of the predetermined range of wavelength to transmit therethrough and a second state where the major axis of the dichroic dye molecules is substantially perpendicular to the traveling direction of the light of the predetermined range of wavelength and the dichroic dye molecules absorbs the predetermined range of wavelength, wherein the dichroic dye molecules selectively block the transmission of the light of the predetermined range of wavelength by absorbing the light of the predetermined range of wavelength.

2. The color liquid crystal display panel as claimed in claim 1, wherein the liquid crystal material is a negative dielectric anisotropic liquid crystal material and the bonding members are optically transparent glue or double-sided adhesive tapes.

3. The color liquid crystal display panel as claimed in claim 1, wherein the thin-film transistor substrate comprises a first transparent substrate, a plurality of gate lines formed on the first transparent substrate, a plurality of data lines formed on the first transparent substrate, an array of thin-film transistors formed on the first transparent substrate, a plurality of pixel electrodes formed on the array of thin-film transistors, a first planarization layer formed on the pixel electrodes and the array of thin-film transistors, and a first alignment layer formed on the first planarization layer.

4. The color liquid crystal display panel as claimed in claim 3, wherein the first transparent substrate is a glass substrate;

the pixel electrodes are made of indium tin oxides; and

the first alignment layer is a vertical alignment layer.

5. The color liquid crystal display panel as claimed in claim 3, wherein the package substrate comprises a second transparent substrate, black matrixes formed on the second transparent substrate, a second planarization layer formed on the second transparent substrate and the black matrixes, common electrodes formed on the second planarization layer, a second alignment layer formed on the common electrodes, and a photo spacer layer formed on the second alignment layer, the black matrixes, the gate lines, the data lines, and the array of thin-film transistors collectively dividing the color liquid crystal display panel into a plurality of pixels.

6. The color liquid crystal display panel as claimed in claim 5, wherein the second transparent substrate is a glass substrate;

the common electrodes are made of indium tin oxides; and

the second alignment layer is a vertical alignment layer.

7. The color liquid crystal display panel as claimed in claim 1, wherein when no driving voltage is applied between the thin-film transistor substrate and the package substrate, the liquid crystal molecules and the dichroic dye molecules are in the first state, where both the liquid crystal molecules and the dichroic dye molecules are aligned in a direction substantially perpendicular to a surface of the thin-film transistor substrate and a surface of the package substrate, whereby the liquid crystal molecules and the dichroic dye molecules do not absorb the light of the predetermined range of wavelength and thus allow the light of the predetermined range of wavelength to transmit therethrough.

8. The color liquid crystal display panel as claimed in claim 1, wherein when a driving voltage is applied between the thin-film transistor substrate and the package substrate, the liquid crystal molecules and the dichroic dye molecules are in the second state, where both the liquid crystal molecules and the dichroic dye molecules are aligned at a predetermined angle with respect to a surface of the thin-film transistor substrate and a surface of the package substrate, the predetermined angle being greater than or equal to 0°

and less than 90°

, whereby the dichroic dye molecules selectively absorbs a portion of the light of the predetermined range of wavelength.

9. The color liquid crystal display panel as claimed in claim 1, wherein the plurality of layers of liquid crystal cell comprises three layers, which are respectively first to third layers of liquid crystal cell, the first-layer liquid crystal cell comprising a dichroic dye that absorbs light in red light wavelength range, the second-layer liquid crystal cell comprising a dichroic dye that absorbs light in green light wavelength range, the third-layer liquid crystal cell comprising a dichroic dye that absorbs light in blue light wavelength range.

10. A color liquid crystal display panel, comprising:

a plurality of mutually parallel layers of liquid crystal cell and bonding members bonding the plurality of layers of liquid crystal cells, each of the liquid crystal cells comprising a thin-film transistor substrate, a package substrate, and a dye-liquid crystal layer sealed between the thin-film transistor substrate and the package substrate, the dye-liquid crystal layer comprising a liquid crystal material and a dichroic dye, the dichroic dye of each of the liquid crystal cells absorbing a light of a predetermined range of wavelength, the plurality of layers of liquid crystal cells respectively absorbing lights of different ranges of wavelength;

wherein the liquid crystal material is a negative dielectric anisotropic liquid crystal material and the bonding members are optically transparent glue or double-sided adhesive tapes;

wherein the thin-film transistor substrate comprises a first transparent substrate, a plurality of gate lines formed on the first transparent substrate, a plurality of data lines formed on the first transparent substrate, an array of thin-film transistors formed on the first transparent substrate, a plurality of pixel electrodes formed on the array of thin-film transistors, a first planarization layer formed on the pixel electrodes and the array of thin-film transistors, and a first alignment layer formed on the first planarization layer;

wherein the first transparent substrate is a glass substrate;

the pixel electrodes are made of indium tin oxides; and

the first alignment layer is a vertical alignment layer;

wherein the package substrate comprises a second transparent substrate, black matrixes formed on the second transparent substrate, a second planarization layer formed on the second transparent substrate and the black matrixes, common electrodes formed on the second planarization layer, a second alignment layer formed on the common electrodes, and a photo spacer layer formed on the second alignment layer, the black matrixes, the gate lines, the data lines, and the array of thin-film transistors collectively dividing the color liquid crystal display panel into a plurality of pixels;

wherein the second transparent substrate is a glass substrate;

the common electrodes are made of indium tin oxides; and

the second alignment layer is a vertical alignment layer; and

wherein for each of the layers of liquid crystal cells, the liquid crystal material comprises liquid crystal molecules and the dichroic dye comprises dichroic dye molecules, the dichroic dye molecules having a molecular structure that is similar to a molecular structure of the liquid crystal molecules and shows absorption of visible light in a condition that a major axis of the dichroic dye molecules is substantially perpendicular to a traveling direction of the visible light, such that the liquid crystal molecules and the dichroic dye molecules are movable in unison with each other between a first state where the major axis of the dichroic dye molecules is substantially parallel to the traveling direction of the light of the predetermined range of wavelength and both the liquid crystal molecules and the dichroic dye molecules allow the light of the predetermined range of wavelength to transmit therethrough and a second state where the major axis of the dichroic dye molecules is substantially perpendicular to the traveling direction of the light of the predetermined range of wavelength and the dichroic dye molecules absorbs the predetermined range of wavelength, wherein the dichroic dye molecules selectively block the transmission of the light of the predetermined range of wavelength by absorbing the light of the predetermined range of wavelength.

11. The color liquid crystal display panel as claimed in claim 10, wherein when no driving voltage is applied between the thin-film transistor substrate and the package substrate, the liquid crystal molecules and the dichroic dye molecules are in the first state, where both the liquid crystal molecules and the dichroic dye molecules are aligned in a direction substantially perpendicular to a surface of the thin-film transistor substrate and a surface of the package substrate, whereby the liquid crystal molecules and the dichroic dye molecules do not absorb the light of the predetermined range of wavelength and thus allow the light of the predetermined range of wavelength to transmit therethrough.

12. The color liquid crystal display panel as claimed in claim 10, wherein when a driving voltage is applied between the thin-film transistor substrate and the package substrate, the liquid crystal molecules and the dichroic dye molecules are in the second state, where both the liquid crystal molecules and the dichroic dye molecules are aligned at a predetermined angle with respect to a surface of the thin-film transistor substrate and a surface of the package substrate, the predetermined angle being greater than or equal to 0°

and less than 90°

, whereby the dichroic dye molecules selectively absorbs a portion of the light of the predetermined range of wavelength.

13. The color liquid crystal display panel as claimed in claim 10, wherein the plurality of layers of liquid crystal cell comprises three layers, which are respectively first to third layers of liquid crystal cell, the first-layer liquid crystal cell comprising a dichroic dye that absorbs light in red light wavelength range, the second-layer liquid crystal cell comprising a dichroic dye that absorbs light in green light wavelength range, the third-layer liquid crystal cell comprising a dichroic dye that absorbs light in blue light wavelength range.