DISPLAY PANEL AND METHOD FOR DRIVING THE SAME

• US 20190326380A1
• Filed: 05/09/2019
• Published: 10/24/2019
• Est. Priority Date: 08/07/2015
• Status: Active Grant

• Current Assignee: Semiconductor Energy Laboratory Co., Ltd.
• Original Assignee: Semiconductor Energy Laboratory Co., Ltd.
• Inventors: KUSUNOKI, Koji
• Granted Patent: US 11,024,692 B2
• Time in Patent Office: Days
• CPC Class Codes: G02F 1/133553 Reflecting elements associated to illuminating devices G02F1/133605
• CPC Class Codes: G02F 1/133565 inside the LC elements, i.e. between the cell substrates
• 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 2201/40 Arrangements for improving the aperture ratio
• CPC Class Codes: G02F 2201/44 Arrangements combining different electro-active layers, e.g. electrochromic, liquid crystal or electroluminescent layers
• CPC Class Codes: G02F 2201/58 Arrangements comprising a monitoring photodetector
• CPC Class Codes: G09G 2300/023 Display panel composed of stacked panels
• CPC Class Codes: G09G 2300/046 with an emissive area and a light-modulating area combined in one pixel
• CPC Class Codes: G09G 2300/0465 Improved aperture ratio, e.g. by size reduction of the pixel circuit, e.g. for improving the pixel density or the maximum displayable luminance or brightness
• CPC Class Codes: G09G 2310/0205 Simultaneous scanning of several lines in flat panels
• CPC Class Codes: G09G 2320/0242 Compensation of deficiencies in the appearance of colours
• CPC Class Codes: G09G 2320/0626 for control of overall brightness
• CPC Class Codes: G09G 2320/066 for control of contrast
• CPC Class Codes: G09G 2320/0666 for control of colour parameters, e.g. colour temperature
• CPC Class Codes: G09G 2320/103 Detection of image changes, e.g. determination of an index representative of the image change
• CPC Class Codes: G09G 2330/021 Power management, e.g. power saving
• CPC Class Codes: G09G 2340/0435 Change or adaptation of the frame rate of the video stream
• CPC Class Codes: G09G 2360/144 the light being ambient light
• CPC Class Codes: G09G 2360/16 Calculation or use of calculated indices related to luminance levels in display data
• CPC Class Codes: G09G 3/3225 : using an active matrix
• CPC Class Codes: G09G 3/3648 : using an active matrix G09G3/367 - G09G3/3696 take precedence
• CPC Class Codes: G09G 5/34 : for rolling or scrolling
• 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 27/1237 : with a different composition, shape, layout or thickness of the gate insulator in different devices
• CPC Class Codes: H01L 27/1251 : comprising TFTs having a different architecture, e.g. top- and bottom gate TFTs
• CPC Class Codes: H01L 29/7869 : having a semiconductor body comprising an oxide semiconductor material, e.g. zinc oxide, copper aluminium oxide, cadmium stannate
• CPC Class Codes: H10K 2102/3035 : Edge emission
• CPC Class Codes: H10K 59/1213 : the pixel elements being TFTs
• CPC Class Codes: H10K 59/128 : comprising two independent displays, e.g. for emitting information from two major sides of the display
• CPC Class Codes: H10K 59/131 : Interconnections, e.g. wiring lines or terminals

Abstract

Provided is a novel display panel that is highly convenient or reliable or a display panel with a high pixel aperture ratio. The display panel includes the first display element, the first conductive film electrically connected to the first display element, the second conductive film having a region overlapping with the first conductive film, the second insulating film having a region sandwiched between the second conductive film and the first conductive film, a pixel circuit electrically connected to the second conductive film, and the second display element electrically connected to the pixel circuit. The second insulating film includes an opening, and the second conductive film is electrically connected to the first conductive film in the opening.

Claims

1. (canceled)

2. A display panel comprising:

a signal line;

a monitor line, and

a pixel comprising a first transistor, a second transistor, a third transistor, a fourth transistor, a reflective display element, and a light-emitting element,

wherein the reflective display element and the light-emitting element overlap each other,

wherein one of a source and a drain of the first transistor and one of a source and a drain of the second transistor are electrically connected to the signal line,

wherein the other of the source and the drain of the first transistor is electrically connected to the reflective display element,

wherein the other of the source and the drain of the second transistor is electrically connected to the light-emitting element through the third transistor,

wherein one of a source and a drain of the fourth transistor is electrically connected to the monitor line, and

wherein the other of the source and the drain of the fourth transistor is electrically connected to the light-emitting element and one of a source and a drain of the third transistor.

3. The display panel according to claim 2,

wherein a gate of the first transistor is electrically connected to a first scan line, and

wherein a gate of the second transistor and a gate of the fourth transistor are electrically connected to a second scan line.

4. The display panel according to claim 2,

wherein one of the first transistor, the second transistor, the third transistor, and the fourth transistor comprises an oxide semiconductor.

5. The display panel according to claim 2,

wherein the reflective display element comprises a reflective film and is configured to reflect an incident light,

wherein the reflective film comprises an opening, and

wherein the light-emitting element is configured to emit light toward the opening.

6. The display panel according to claim 2,

wherein a display region of the light-emitting element is surrounded by a display region of the reflective display element.

7. The display panel according to claim 2,

wherein the reflective display element comprises a liquid crystal material.

8. A display panel comprising:

a first signal line driver circuit;

a second signal line driver circuit;

a first transistor;

a second transistor;

a signal line;

a monitor line, and

a pixel comprising a third transistor, a fourth transistor, a fifth transistor, a sixth transistor, a reflective display element, and a light-emitting element,

wherein the first signal line driver circuit is electrically connected to the signal line through the first transistor,

wherein the second signal line driver circuit is electrically connected to the signal line through the second transistor,

wherein the reflective display element and the light-emitting element overlap each other,

wherein one of a source and a drain of the third transistor and one of a source and a drain of the fourth transistor are electrically connected to the signal line,

wherein the other of the source and the drain of the third transistor is electrically connected to the reflective display element,

wherein the other of the source and the drain of the fourth transistor is electrically connected to the light-emitting element through the fifth transistor,

wherein one of a source and a drain of the sixth transistor is electrically connected to the monitor line, and

wherein the other of the source and the drain of the sixth transistor is electrically connected to the light-emitting element and one of a source and a drain of the fifth transistor.

9. The display panel according to claim 8,

wherein a gate of the third transistor is electrically connected to a first scan line, and

wherein a gate of the fourth transistor and a gate of the sixth transistor are electrically connected to a second scan line.

10. The display panel according to claim 8,

wherein one of the third transistor, the fourth transistor, the fifth transistor, and the sixth transistor comprises an oxide semiconductor.

11. The display panel according to claim 8,

wherein the reflective display element comprises a reflective film and is configured to reflect an incident light,

wherein the reflective film comprises an opening, and

wherein the light-emitting element is configured to emit light toward the opening.

12. The display panel according to claim 8,

wherein a display region of the light-emitting element is surrounded by a display region of the reflective display element.

13. The display panel according to claim 8,

wherein the reflective display element comprises a liquid crystal material.

14. A display panel comprising:

a signal line driver circuit;

a signal line; and

a pixel comprising a first transistor, a second transistor, a third transistor, a reflective display element, and a light-emitting element,

wherein the signal line driver circuit is electrically connected to the signal line,

wherein the reflective display element and the light-emitting element overlap each other,

wherein one of a source and a drain of the first transistor and one of a source and a drain of the second transistor are electrically connected to the signal line,

wherein the other of the source and the drain of the first transistor is electrically connected to the reflective display element, and

wherein the other of the source and the drain of the second transistor is electrically connected to the light-emitting element through the third transistor.

15. The display panel according to claim 14,

wherein a first gate of the third transistor is electrically connected to the other of the source and the drain of the second transistor, and

wherein one of a source and a drain of the third transistor is electrically connected to the light-emitting element.

16. The display panel according to claim 14,

wherein a first gate of the third transistor and a second gate of the third transistor are electrically connected to the other of the source and the drain of the second transistor, and

wherein one of a source and a drain of the third transistor is electrically connected to the light-emitting element.

17. The display panel according to claim 14,

wherein a gate of the first transistor is electrically connected to a first scan line, and

wherein a gate of the second transistor is electrically connected to a second scan line.

18. The display panel according to claim 14,

wherein one of the first transistor, the second transistor, and the third transistor comprises an oxide semiconductor.