Display device, display module, and electronic device

• US 10,002,564 B2
• Filed: 10/28/2015
• Issued: 06/19/2018
• Est. Priority Date: 10/31/2014
• Status: Active Grant

• Current Assignee: Semiconductor Energy Laboratory Co., Ltd.
• Original Assignee: Semiconductor Energy Laboratory Co., Ltd.
• Inventors: Kimura, Hajime, Miyake, Hiroyuki
• Primary Examiner(s): Rayan, Mihir K
• Application Number:
  US14/925,744
• Publication Number:
  US 20160232834A1
• Time in Patent Office: 965 Days
• CPC Class Codes: G09G 2300/0426 Layout of electrodes and connections
• CPC Class Codes: G09G 2300/043 Compensation electrodes or other additional electrodes in matrix displays related to distortions or compensation signals, e.g. for modifying TFT threshold voltage in column driver
• CPC Class Codes: G09G 2300/0814 used for selection purposes, e.g. logical AND for partial update
• CPC Class Codes: G09G 2300/0842 forming a memory circuit, e.g. a dynamic memory with one capacitor
• CPC Class Codes: G09G 2310/061 for resetting or blanking
• CPC Class Codes: G09G 2320/0233 Improving the luminance or brightness uniformity across the screen
• CPC Class Codes: G09G 2320/029 by monitoring one or more pixels in the display panel, e.g. by monitoring a fixed reference pixel
• CPC Class Codes: G09G 2320/045 Compensation of drifts in the characteristics of light emitting or modulating elements
• CPC Class Codes: G09G 2320/046 Dealing with screen burn-in prevention or compensation of the effects thereof
• CPC Class Codes: G09G 2330/045 Protection against panel overheating
• CPC Class Codes: G09G 3/3233 with pixel circuitry controlling the current through the light-emitting element
• CPC Class Codes: G09G 3/325 the data current flowing through the driving transistor during a setting phase, e.g. by using a switch for connecting the driving transistor to the data driver

Abstract

To provide a display device which can perform external correction and has a reduced area occupied by a read circuit. The display device includes a pixel and the read circuit. The pixel includes a transistor and a display element. The read circuit includes a function selection portion and an operational amplifier. The transistor is electrically connected to the function selection portion through a wiring. The operational amplifier is electrically connected to the function selection portion. The function selection portion includes at least one switch and can select the function of the read circuit by switching of the switch.

Claims

1. A display device comprising:

a pixel comprising a transistor and a display element;

a first circuit comprising a second circuit and an operational amplifier; and

a wiring,

wherein the transistor is electrically connected to the second circuit through the wiring,

wherein the operational amplifier is electrically connected to the second circuit,

wherein the second circuit is configured to select whether the first circuit is configured as an integrator circuit whose input terminal is an inverting input terminal of the operational amplifier or a voltage follower circuit whose input terminal is a non-inverting input terminal of the operational amplifier,

wherein the second circuit is configured to establish an electrical continuity between the input terminal of the integrator circuit and the wiring, and

wherein the second circuit is configured to establish an electrical continuity between the input terminal of the voltage follower circuit and the wiring.

2. The display device according to claim 1, wherein the second circuit includes a passive element.

3. The display device according to claim 1, wherein the first circuit is a read circuit in a driver circuit portion of the display device.

4. The display device according to claim 1, wherein the display element is a light-emitting element.

5. A display device comprising:

a pixel comprising a transistor and a display element;

a first circuit comprising a second circuit and an operational amplifier electrically connected to the second circuit, the second circuit comprising a capacitor;

a first wiring; and

a second wiring,

wherein the transistor is electrically connected to the second circuit through the first wiring,

wherein one electrode of the capacitor is electrically connected to an inverting input terminal of the operational amplifier,

wherein the other electrode of the capacitor is electrically connected to an output terminal of the operational amplifier,

wherein the second circuit includes a first switch, a second switch, a third switch, and a fourth switch,

wherein the inverting input terminal of the operational amplifier is electrically connected to the first wiring through the first switch,

wherein a non-inverting input terminal of the operational amplifier is electrically connected to the first wiring through the second switch,

wherein the non-inverting input terminal of the operational amplifier is electrically connected to the second wiring through the third switch, and

wherein the output terminal of the operational amplifier is electrically connected to the inverting input terminal of the operational amplifier through the fourth switch.

6. The display device according to claim 5, wherein the first circuit is a read circuit in a driver circuit portion of the display device.

7. The display device according to claim 5,

wherein the second circuit is configured to select whether the first circuit is configured as an integrator circuit whose input terminal is the inverting input terminal of the operational amplifier or a voltage follower circuit whose input terminal is the non-inverting input terminal of the operational amplifier.

8. The display device according to claim 5, wherein the display element is a light-emitting element.

9. The display device according to claim 5, wherein the second wiring is configured to supply a reference potential.

10. A display device comprising:

a pixel comprising a transistor and a display element;

a first circuit comprising a second circuit and an operational amplifier; and

a first wiring,

wherein the transistor is electrically connected to the second circuit through the first wiring,

wherein the operational amplifier is electrically connected to the second circuit,

wherein the second circuit is configured to select whether the first circuit is configured as a current-voltage converter circuit whose input terminal is an inverting input terminal of the operational amplifier or a voltage follower circuit whose input terminal is a non-inverting input terminal of the operational amplifier,

wherein the second circuit is configured to establish an electrical continuity between the input terminal of the current-voltage converter circuit and the wiring, and

wherein the second circuit is configured to establish an electrical continuity between the input terminal of the voltage follower circuit and the wiring.

11. The display device according to claim 10, further comprising a second wiring,

wherein the second circuit includes a resistor, a first switch, a second switch, a third switch, a fourth switch, and a fifth switch,

wherein the inverting input terminal of the operational amplifier is electrically connected to the first wiring through the first switch,

wherein the non-inverting input terminal of the operational amplifier is electrically connected to the first wiring through the second switch,

wherein the non-inverting input terminal of the operational amplifier is electrically connected to the second wiring through the third switch,

wherein an output terminal of the operational amplifier is electrically connected to the inverting input terminal of the operational amplifier through the fourth switch and the resistor, and

wherein the output terminal of the operational amplifier is electrically connected to the inverting input terminal of the operational amplifier through the fifth switch.

12. The display device according to claim 11, wherein the second wiring is configured to supply a reference potential.

13. The display device according to claim 10, wherein the first circuit is a read circuit in a driver circuit portion of the display device.

14. The display device according to claim 10, wherein the display element is a light-emitting element.

15. A display device comprising:

a pixel comprising a transistor and a display element;

a first circuit comprising a second circuit and an operational amplifier; and

a first wiring,

wherein the transistor is electrically connected to the second circuit through the first wiring,

wherein the operational amplifier is electrically connected to the second circuit,

wherein the second circuit is configured to select whether the first circuit is configured as an integrator circuit whose input terminal is an inverting input terminal of the operational amplifier or a current-voltage converter circuit whose input terminal is the inverting input terminal of the operational amplifier,

wherein the second circuit is configured to establish an electrical continuity between the input terminal of the integrator circuit and the wiring, and

wherein the second circuit is configured to establish an electrical continuity between the input terminal of the current-voltage converter circuit and the wiring.

16. The display device according to claim 15, further comprising a second wiring,

wherein the second circuit includes a capacitor, a resistor, a first switch, a second switch and a third switch,

wherein the inverting input terminal of the operational amplifier is electrically connected to the first wiring,

wherein a non-inverting input terminal of the operational amplifier is electrically connected to the second wiring,

wherein the inverting input terminal of the operational amplifier is electrically connected to an output terminal of the operational amplifier through the resistor and the first switch,

wherein the inverting input terminal of the operational amplifier is electrically connected to the output terminal of the operational amplifier through the resistor and the first switch,

wherein the inverting input terminal of the operational amplifier is electrically connected to the output terminal of the operational amplifier through the capacitor and the second switch, and

wherein the inverting input terminal of the operational amplifier is electrically connected to the output terminal of the operational amplifier through the third switch.

17. The display device according to claim 16, wherein the second wiring is configured to supply a reference potential.

18. The display device according to claim 15, wherein the first circuit is a read circuit in a driver circuit portion of the display device.

19. The display device according to claim 15, wherein the display element is a light-emitting element.

20. A display module comprising:

the display device according to claim 15; and

a circuit board, an FPC, or a touch sensor.

21. An electronic device comprising:

the display device according to claim 15; and

a speaker, a microphone, an operation key, or a housing.