LIQUID CRYSTAL DISPLAY DEVICE AND METHOD OF MANUFACTURING THEREOF

• US 20200135134A1
• Filed: 10/26/2018
• Published: 04/30/2020
• Est. Priority Date: 10/26/2018
• Status: Abandoned Application

• Current Assignee: Pasona Knowledge Partner Inc.
• Original Assignee: Panasonic Liquid Crystal Display Company Limited (Panasonic Holdings Corporation)
• Inventors: Nakagawa, Teruhisa
• Application Number:
  US16/172,322
• Publication Number:
  US 20200135134A1
• Time in Patent Office: Days
• CPC Class Codes: G02F 1/13336 Combining plural substrates to produce large-area displays, e.g. tiled displays
• CPC Class Codes: G02F 1/133602 Direct backlight
• CPC Class Codes: G02F 1/1347 Arrangement of liquid crystal layers or cells in which the final condition of one light beam is achieved by the addition of the effects of two or more layers or cells
• CPC Class Codes: G02F 2201/52 RGB geometrical arrangements
• CPC Class Codes: G09G 2300/023 Display panel composed of stacked panels
• CPC Class Codes: G09G 2300/0426 Layout of electrodes and connections
• CPC Class Codes: G09G 2300/0439 Pixel structures
• CPC Class Codes: G09G 2310/0218 with collection of electrodes in groups for n-dimensional addressing
• CPC Class Codes: G09G 2310/027 Details of drivers for data electrodes, the drivers handling digital grey scale data, e.g. use of D/A converters
• CPC Class Codes: G09G 2320/02 Improving the quality of display appearance
• CPC Class Codes: G09G 2330/021 Power management, e.g. power saving
• CPC Class Codes: G09G 2340/0414 Vertical resolution change
• CPC Class Codes: G09G 2340/0421 Horizontal resolution change
• CPC Class Codes: G09G 3/3648 using an active matrix G09G3/367 - G09G3/3696 take precedence
• CPC Class Codes: G09G 3/3685 Details of drivers for data electrodes
• 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 27/1288 employing particular masking sequences or specially adapted masks, e.g. half-tone mask

Abstract

A liquid crystal display device comprising a first display panel and a second display panel is provided. The first display panel comprises a plurality of first gate lines and a plurality of first data lines defining a matrix of first pixels in a first display region thereof. The second display panel comprises a plurality of second gate lines and a plurality of second data lines defining a matrix of second pixels in a second display region thereof. The first display panel and the second display panel overlap each other in plan view. The first display panel and the second display panel have equal densities of first pixels and second pixels, respectively, therein. The first display panel displays at a lower definition as compared to the second display panel.

Claims

1. A liquid crystal display device comprising:

a first display panel comprising a plurality of first gate lines and a plurality of first data lines in a first display region thereof, and a second display panel comprising a plurality of second gate lines and a plurality of second data lines in a second display region thereof; and

a first driving circuit for one or more of the plurality of first gate lines and the plurality of first data lines, wherein the first driving circuit comprises one or more first drivers to provide signals to the one or more of the plurality of first gate lines and the plurality of first data lines,

wherein the first display panel and the second display panel overlap each other in plan view,

wherein the plurality of first gate lines and the plurality of first data lines correspond to the plurality of second gate lines and the plurality of second data lines, respectively, in the first display region and the second display region of the first display panel and the second display panel, and

wherein at least one of two or more adjacent first gate lines from the plurality of first gate lines and two or more adjacent first data lines from the plurality of first data lines are provided with same signals at a same instant of time.

2. The liquid crystal display device according to claim 1, wherein the first driving circuit comprises a first gate driving circuit for the plurality of first gate lines and the one or more first drivers comprise one or more first gate drivers to provide gate signals to the plurality of first gate lines, wherein two or more adjacent first gate lines from the plurality of first gate lines are provided with the same gate signals at the same instant of time.

3. The liquid crystal display device according to claim 2, wherein the two or more adjacent first gate lines from the plurality of first gate lines are electrically connected to each other by a gate lead connector, and wherein the gate lead connector is formed outside the first display region, and connects between the two or more adjacent first gate lines and one gate terminal of the one or more first gate drivers to receive the gate signals for the two or more adjacent first gate lines.

4. The liquid crystal display device according to claim 3, wherein the plurality of first gate lines include a first gate line group of the two or more adjacent first gate lines and a second gate line group of the two or more adjacent first gate lines, the first gate line group and the second gate line group being arranged adjacent to each other, and wherein a first gate terminal of the one or more first gate drivers electrically connects to the first gate line group, a second gate terminal of the one or more first gate drivers electrically connects to the second gate line group, and a third gate terminal of the one or more first gate drivers located between the first gate terminal and the second gate terminal is voided.

5. The liquid crystal display device according to claim 1, wherein the first driving circuit comprises a first data driving circuit for the plurality of first data lines and the one or more first drivers comprise one or more first data drivers to provide data signals to the plurality of first data lines, wherein two or more adjacent first data lines from the plurality of first data lines are provided with the same data signals at the same instant of time.

6. The liquid crystal display device according to claim 5, wherein the two or more adjacent first data lines from the plurality of first data lines are electrically connected to each other by a data lead connector, and wherein the data lead connector is formed outside the first display region, and connects between the two or more adjacent first data lines and one data terminal of the one or more first data drivers to receive the data signals for the two or more adjacent first data lines.

7. The liquid crystal display device according to claim 6, wherein the plurality of first data lines include a first data line group of the two or more adjacent first data lines and a second data line group of the two or more adjacent first data lines, the first data line group and the second data line group being arranged adjacent to each other, and wherein a first data terminal of the one or more first data drivers electrically connects to the first data line group, a second data terminal of the one or more first data drivers electrically connects to the second data line group, and a third data terminal of the one or more first data drivers located between the first data terminal and the second data terminal is voided.

8. The liquid crystal display device according to claim 1 further comprising a second driving circuit for one or more of the plurality of second gate lines and the plurality of second data lines, wherein the second driving circuit comprises one or more second drivers to provide signals to the one or more of the plurality of second gate lines and the plurality of second data lines, and wherein a number of first drivers are less than a number of second drivers.

9. The liquid crystal display device according to claim 1 further comprising a second driving circuit for one or more of the plurality of second gate lines and the plurality of second data lines, wherein the second driving circuit comprises one or more second drivers to provide signals to the one or more of the plurality of second gate lines and the plurality of second data lines, and wherein a number of terminals in the one or more first drivers are less than a number of terminals in the one or more second drivers.

10. A liquid crystal display device comprising:

a first display panel comprising a plurality of first gate lines and a plurality of first data lines in a first display region thereof, wherein two adjacent first gate lines from the plurality of first gate lines and two adjacent first data lines from the plurality of first data lines define a first pixel in the first display region;

a second display panel comprising a plurality of second gate lines and a plurality of second data lines in a second display region thereof, wherein two adjacent second gate lines from the plurality of second gate lines and two adjacent second data lines from the plurality of second data lines define a second pixel in the second display region,

wherein the first display panel and the second display panel overlap each other in plan view,

wherein the first display panel and the second display panel have equal densities of first pixels and second pixels, respectively, therein, and

wherein the first display panel displays at a lower definition as compared to the second display panel.

11. The liquid crystal display device according to claim 10, wherein the first display panel comprises a first gate driving circuit comprising one or more first gate drivers to provide gate signals to the plurality of first gate lines, wherein two or more adjacent first gate lines from the plurality of first gate lines are provided with gate signals at a same instant of time.

12. The liquid crystal display device according to claim 11, wherein the two or more adjacent first gate lines from the plurality of first gate lines are electrically connected to each other by a gate lead connector, and wherein the gate lead connector is formed outside the first display region, and connects between the two or more adjacent first gate lines and one gate terminal of the one or more first gate drivers to receive the gate signals for the two or more adjacent first gate lines.

13. The liquid crystal display device according to claim 12, wherein the plurality of first gate lines include a first gate line group of the two or more adjacent first gate lines and a second gate line group of the two or more adjacent first gate lines, the first gate line group and the second gate line group being arranged adjacent to each other, and wherein a first gate terminal of the one or more first gate drivers electrically connects to the first gate line group and a second gate terminal of the one or more first gate drivers electrically connects to the second gate line group and a third gate terminal of the one or more first gate drivers located between the first gate terminal and the second gate terminal is voided.

14. The liquid crystal display device according to claim 10, wherein the first display panel comprises a first data driving circuit comprising one or more first data drivers to provide data signals to the plurality of first data lines, wherein two or more adjacent first data lines from the plurality of first data lines are provided with data signals of same gray scale at the same instant of time.

15. The liquid crystal display device according to claim 14, wherein the two or more adjacent first data lines from the plurality of first data lines are electrically connected to each other by a data lead connector, and wherein the data lead connector is formed outside the first display region, and connects between the two or more adjacent first data lines and one data terminal of the one or more first data drivers to receive the data signals for the two or more adjacent first data lines.

16. The liquid crystal display device according to claim 15, wherein the plurality of first data lines include a first data line group of the two or more adjacent first data lines and a second data line group of the two or more adjacent first data lines, the first data line group and the second data line group being arranged adjacent to each other, and wherein a first data terminal of the one or more first data drivers electrically connects to the first data line group and a second data terminal of the one or more first data drivers electrically connects to the second data line group and a third data terminal of the one or more first data drivers located between the first data terminal and the second data terminal is voided.

17. A method of manufacturing a liquid crystal display device,

the liquid crystal display device comprising:

a first display panel including a plurality of first gate lines, a plurality of first data lines, and a plurality of pixel electrodes in a first display region thereof, and

a second display panel comprising a plurality of second gate lines and a plurality of second data lines, and a plurality of second pixel electrodes in a second display region thereof, the first display panel and the second display panel overlapping each other in plan view,

the method comprising;

a first series of photolithography steps for manufacturing the first display panel; and

a second series of photolithography steps for manufacturing the second display panel, wherein;

the first series of photolithography steps comprises;

a first gate line step of forming the plurality of first gate lines by a first photo-mask,

a first data line step of forming the plurality of first data lines by a second photo-mask, and

a first pixel electrode step of forming the plurality of first pixel electrodes by a third photo-mask;

the second series of photolithography steps comprises;

a second gate line step of forming the plurality of second gate lines by a fourth photo-mask,

a second data line step of forming the plurality of second data lines by a fifth photo-mask, and

a second pixel electrode step of forming the plurality of second pixel electrodes by a sixth photo-mask,

wherein the third photo-mask and the sixth photo-mask have a same shape, and at least one of the first photo-mask and the second photo-mask has a different shape from the fourth photo-mask and the fifth photo-mask, respectively.

18. The method according to claim 17, wherein common shape of photo-mask is used in both each step from the first series of photolithography steps and each corresponding step from the second series of photolithography steps, other than at least one of both of the first gate line step and the second gate line step, and both of the first data line step and the second data line step.

19. The method according to claim 17, wherein the first photo-mask has a different shape from the fourth photo-mask, and the second photo-mask has a different shape from the fifth photo-mask.

20. The method according to claim 17, wherein two or more adjacent first gate lines from the plurality of first gate lines are electrically connected to each other by a gate lead connector, two or more adjacent first data lines from the plurality of first data lines are electrically connected to each other by a data lead connector, or the two or more adjacent first gate lines and the two or more adjacent first data lines are electrically connected to each other by the gate lead connector and the data lead connector, respectively.