LIQUID CRYSTAL DISPLAY DEVICE

• US 20190056619A1
• Filed: 07/23/2018
• Published: 02/21/2019
• Est. Priority Date: 08/17/2017
• Status: Active Grant

• Current Assignee: Trivale Technologies, LLC (Vector Capital Corporation)
• Original Assignee: Mitsubishi Electric Corporation
• Inventors: UMEDA, Hiroshi
• Granted Patent: US 10,642,090 B2
• Time in Patent Office: Days
• CPC Class Codes: G02F 1/13306 Circuit arrangements or driving methods for the control of single liquid crystal cells G02F1/132, G02F1/133382 take precedence
• 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 1/1339 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 1/13396 Spacers having different sizes
• CPC Class Codes: G02F 1/1343 Electrodes reflective electrodes G02F1/133553
• CPC Class Codes: G02F 1/136286 Wiring, e.g. gate line, drain line
• CPC Class Codes: G02F 2001/1635 the pixel comprises active switching elements, e.g. TFT
• CPC Class Codes: G02F 2201/121 common or background
• CPC Class Codes: G02F 2201/123 pixel

Abstract

A liquid crystal display device according to the present invention includes an array substrate and a CF substrate. The CF substrate includes a lattice-shaped light shielding pattern between pixel electrodes and a columnar spacer at an intersection of the light shielding patterns. The array substrate and the CF substrate are disposed so as to face each other with a liquid crystal layer interposed therebetween. The intersection includes a portion in which signal lines intersect each other and a portion in which the signal lines do not intersect each other, whereby a step is provided on a surface of the array substrate. The columnar spacer includes a main spacer in the portion in which the signal lines intersect each other and a sub-spacer in the portion in which the signal lines do not intersect each other.

Claims

1. A liquid crystal display device comprising:

an array substrate on which a plurality of pixel electrodes, a switching element, a plurality of scanning signal lines, and a plurality of video signal lines are provided, the plurality of pixel electrodes being arranged in a matrix form in a display region where an image is displayed, the switching element being connected to each of the pixel electrodes, the plurality of scanning signal lines and the plurality of video signal lines extending in a row direction or a column direction while intersecting each other, the plurality of scanning signal lines and the plurality of video signal lines being connected to the switching element; and

a counter substrate that is provided opposite the array substrate with an interval while a liquid crystal layer is interposed between the counter substrate and the array substrate, and includes a black matrix that is constructed with a light shielding pattern formed into a lattice shape while overlapping a region between the pixel electrodes arranged in the matrix form and a plurality of columnar spacers that hold the interval between the counter substrate and the array substrate within a fixed range,

wherein either one of the plurality of scanning signal lines and the plurality of video signal lines are disposed on the array substrate in a region between any two rows of pixel electrodes adjacent to each other, a region where one signal line of the other of the plurality of scanning signal lines and the plurality of video signal lines is disposed and a region where one signal line of the other of the plurality of scanning signal lines and the plurality of video signal lines is not disposed are disposed in a mixed manner in a region between any two columns of pixel electrodes adjacent to each other,

an intersection of the light shielding pattern formed into the lattice shape includes a portion in which the scanning signal line and the video signal line intersect each other and a portion in which the scanning signal line and the video signal line do not intersect each other, a step having a difference in height of a surface of the array substrate is provided between the portion in which the scanning signal line and the video signal line intersect each other and the portion in which the scanning signal line and the video signal line do not intersect each other,

the columnar spacer includes a main spacer and a sub-spacer, the main spacer being provided at the intersection of the light shielding pattern formed into the lattice shape while provided in the portion in which the scanning signal line and the video signal line intersect with each other, the main spacer abutting on the surface of the array substrate, the sub-spacer being provided at the portion in which the scanning signal line and the video signal line do not intersect each other, the sub-spacer not abutting on the surface of the array substrate in a normal time, the sub-spacer abutting on the surface of the array substrate when the interval is narrowed within the fixed range.

2. The liquid crystal display device according to claim 1, wherein in the black matrix constructed with the light shielding pattern formed into the lattice shape, the light shielding pattern that is provided along the column direction is provided with an identical width between columns.

3. The liquid crystal display device according to claim 1, wherein in the black matrix constructed with the light shielding pattern formed into the lattice shape, the light shielding pattern that is provided along the column direction overlapping the region where one signal line of the other of the plurality of scanning signal lines and the plurality of video signal lines is not disposed is narrower than the light shielding pattern that is disposed in the column direction while overlapping the region where one signal line of the other of the plurality of scanning signal lines and the plurality of video signal lines is disposed.

4. The liquid crystal display device according to claim 1, comprising a counter electrode that drives a liquid crystal in the liquid crystal layer by generating an electric field between the counter electrode and the pixel electrode provided on the array substrate,

wherein at least one of the pixel electrode and the counter electrode includes a slit electrode or a comb-tooth electrode while a longitudinal direction of the slit electrode or the comb-tooth electrode is set to the column direction.

5. The liquid crystal display device according to claim 1, comprising a counter electrode that drives a liquid crystal in the liquid crystal layer by generating an electric field between the counter electrode and the pixel electrode provided on the array substrate,

wherein at least one of the pixel electrode and the counter electrode includes a bent-shaped slit electrode or a bent-shaped comb-tooth electrode having two longitudinal directions which are positively or negatively inclined at an identical angle of 30 degrees or less with respect to the column direction.

6. The liquid crystal display device according to claim 1, wherein the main spacer and the sub-spacer are fixedly attached to a surface of the counter substrate, and constructed with resin patterns having an identical thickness.

7. The liquid crystal display device according to claim 6, wherein

the liquid crystal display device is a transflective liquid crystal display device in which the pixel electrode includes a transmissive electrode that forms a transmissive region partially transmitting light and a reflective electrode that forms a reflective region partially reflecting light,

a gap adjustment layer is provided on the counter substrate while provided with a predetermined film thickness in at least the reflective region and opened in the transmissive region, the gap adjustment layer adjusting a thickness of the liquid crystal layer in the reflective region such that the thickness of the liquid crystal layer in the reflective region is thinner than a thickness of the liquid crystal layer in the transmissive region by the predetermined film thickness, and the main spacer and the sub-spacer are disposed on a surface of the gap adjustment layer.

8. The liquid crystal display device according to claim 1, wherein

the main spacer and the sub-spacer are fixedly attached to a surface of the counter substrate, and constructed with resin patterns having different thicknesses, and

the resin pattern constituting the sub-spacer is thinner than the resin pattern constituting the main spacer.

9. The liquid crystal display device according to claim 1, wherein the liquid crystal display device is a liquid crystal display device of a double scanning line system in which two scanning signal lines are disposed on the array substrate in the region between any two rows of pixel electrodes adjacent to each other, and a region where one video signal line is disposed and a region where the video signal line is not disposed are alternately disposed for each column on the array substrate in the region between any two columns of pixel electrodes adjacent to each other.

10. The liquid crystal display device according to claim 1, wherein

two video signal lines are disposed on the array substrate in the region between any two rows of pixel electrodes adjacent to each other, a region where one scanning signal line is disposed and a region where the scanning signal line is not disposed are alternately disposed for each column on the array substrate in the region between any two columns of pixel electrodes adjacent to each other, and

in pixels corresponding to the plurality of pixel electrodes arrayed in the matrix form, picture elements in each of which four pixels are set as repetitive units are arrayed to perform color display, the four pixels including four colors of blue, red, green, and white which are arranged in a matrix of two rows and two columns.