Display device, system having the same, and pixel

• US 9,852,691 B2
• Filed: 05/12/2015
• Issued: 12/26/2017
• Est. Priority Date: 01/19/2015
• Status: Active Grant

• Current Assignee: Samsung Display Company Limited (Samsung Electronics Co. Ltd.)
• Original Assignee: Samsung Display Company Limited (Samsung Electronics Co. Ltd.)
• Inventors: Hyun, Chang-Ho
• Primary Examiner(s): MANDEVILLE, JASON M
• Application Number:
  US14/709,814
• Publication Number:
  US 20160210899A1
• Time in Patent Office: 959 Days
• Field of Search: 345211, 345212, 345 76
• CPC Class Codes: G09G 2300/026 Video wall, i.e. juxtaposition of a plurality of screens to create a display screen of bigger dimensions
• CPC Class Codes: G09G 2310/08 Details of timing specific for flat panels, other than clock recovery
• CPC Class Codes: G09G 2330/02 Details of power systems and of start or stop of display operation
• CPC Class Codes: G09G 2330/028 Generation of voltages supplied to electrode drivers in a matrix display other than LCD
• CPC Class Codes: G09G 3/2085 Special arrangements for addressing the individual elements of the matrix, other than by driving respective rows and columns in combination
• CPC Class Codes: G09G 3/3258 with pixel circuitry controlling the voltage across the light-emitting element

Abstract

A display device, system having the same, and pixel are disclosed. In one aspect, the display device includes a display panel including a plurality of pixels and a plurality of wireless power receivers. The display device also includes a wireless power transmitter configured to generate and wirelessly transmit power to the wireless power receivers. Each of the wireless power receivers is configured to wirelessly receive the power from the wireless power transmitter and provide a first power supply voltage to the pixels. The display device further includes a power supply configured to generate an initial power supply voltage and provide the initial power supply voltage to the wireless power transmitter.

Claims

1. A display device, comprising:

a display panel including a substrate, a plurality of pixels on the substrate each comprising an organic light-emitting diode (OLED) and a driving transistor and a plurality of wireless power receivers formed in a thin film that is arranged between the substrate and the driving transistor, wherein each of the wireless power receivers is connected to a group of the pixels;

a wireless power transmitter configured to;

i) generate power based on an initial power supply voltage and ii) wirelessly transmit the generated power to the wireless power receivers, wherein each of the wireless power receivers is configured to;

i) wirelessly receive the generated power from the wireless power transmitter, ii) convert the received power into a first power supply voltage, the first power supply voltage being a direct current (DC) voltage, and iii) provide the first power supply voltage to a first electrode of each driving transistor of respective pixels, wherein the wireless power transmitter includes a power transmitter on the display panel to transmit alternating current (AC) power as the generated power to the wireless power receivers;

a power supply configured to;

i) generate the initial power supply voltage, ii) provide the initial power supply voltage to the wireless power transmitter and iii), while providing the initial power supply voltage to the wireless power transmitter, generate a second power supply voltage and provide the second power supply voltage to the pixels via a common power supply line electrically connected to each of the pixels, wherein the second power supply voltage is supplied to a terminal of the OLED of each pixel;

a display panel driver configured to drive the display panel; and

a timing controller configured to control the display panel driver.

2. The device of claim 1, wherein the wireless power receivers are formed in a thin film that is interposed between the pixels and the substrate.

3. The device of claim 1, wherein each of the wireless power receivers is connected to at least two of the pixels.

4. The device of claim 1, wherein each of the wireless power receivers is connected to a subset of the pixels that are arranged in an N by N matrix, where N is a positive integer.

5. The device of claim 4, wherein the number of the wireless power receivers corresponds to about 1/N², wherein N is an integer equal to or greater than two.

6. The device of claim 1, wherein the first power supply voltage is greater than the second power supply voltage.

7. The device of claim 1, wherein each of the wireless power receivers is further configured to receive the generated power through a mutual resonance with the wireless power transmitter.

8. The device of claim 7, wherein each of the wireless power receivers includes:

a power receiver configured to receive the AC power from the wireless power transmitter;

a rectifier configured to convert the AC power into the first power supply voltage; and

an impedance matcher configured to match the output impedance of the power receiver and the input impedance of the rectifier.

9. The device of claim 7, wherein the wireless power transmitter further includes:

an oscillator configured to generate the AC power via oscillating the initial power supply voltage received from the power supply.

10. The device of claim 9, wherein the power transmitter is included in a conductive film that is arranged on the display panel, and wherein the power transmitter includes a resonant coil.

11. The device of claim 9, wherein the oscillator is included in the power supply.

12. The device of claim 1, wherein each of the wireless power receivers is further configured to wirelessly receive the generated power from the wireless power transmitter through electromagnetic induction.

13. A system, comprising:

a storage device configured to store image data;

a display configured to display the image data; and

a processor configured to control the storage device and the display,

wherein the display includes;

a display panel including a substrate, a plurality of pixels on the substrate each comprising an organic light-emitting diode (OLED) and a driving transistor and a plurality of wireless power receivers formed in a thin film that is arranged between the substrate and the driving transistor, wherein each of the wireless power receivers is connected to a group of the pixels;

a wireless power transmitter configured to;

i) generate power based on an initial power supply voltage and ii) wirelessly transmit the generated power to the wireless power receivers, wherein each of the wireless power receivers is configured to;

i) receive the generated power from the wireless power transmitter ii) convert the received power into a first power supply voltage, the first power supply voltage being a direct current (DC) voltage, and iii) provide the first power supply voltage to a first electrode of each driving transistor of respective pixels, wherein the wireless power transmitter includes a power transmitter on the display panel to transmit alternating current (AC) power as the generated power to the wireless power receivers;

a power supply configured to;

i) generate the initial power supply voltage, ii) provide the initial power supply voltage to the wireless power transmitter, and iii), while providing the initial power supply voltage to the wireless power transmitter, generate a second power supply voltage and provide the second power supply voltage to the pixels via a common power supply line electrically connected to each of the pixels, wherein the second power supply voltage is supplied to a terminal of the OLED of each pixel;

a display panel driver configured to drive the display panel; and

a timing controller configured to control the display panel driver.

14. The system of claim 13, wherein each of the wireless power receivers is formed in a thin film that is interposed between the driving transistor of each of the pixels and the substrate, and wherein each of the wireless power receivers is connected a subset of the pixels that are arranged in an N by N matrix, where N is a positive integer.

15. A pixel, comprising:

an organic light-emitting diode (OLED) comprising an anode and a cathode, the cathode electrically connected to a power supply line;

a switching transistor including;

i) a gate electrode configured to receive a scan signal, ii) a first electrode configured to receive a data signal, and iii) a second electrode, the switching transistor being on a substrate;

a driving transistor configured to supply a driving current to the OLED, wherein the driving transistor includes;

i) a gate electrode connected to the second electrode of the switching transistor, ii) a first electrode configured to receive an initial power supply voltage, and iii) a second electrode connected to the anode of the OLED, the driving transistor being on the substrate;

a wireless power receiver configured to;

i) wirelessly receive an initial power from an external wireless power transmitter, ii) convert the received initial power into the initial power supply voltage, the initial power supply voltage being a direct current (DC) voltage, and iii) provide the initial power supply voltage to the first electrode of the driving transistor, the wireless power receiver formed in a thin film that is arranged between the substrate and the switching and driving transistors, the wireless power receiver connected to a plurality of pixels,

wherein the external wireless power transmitter is configured to;

i) generate the initial power based on an initial voltage and ii) wirelessly transmit the generated initial power to the wireless power receivers, the generated initial power being an alternating current (AC) power, and a power supply is configured to;

i) generate the initial voltage, ii) provide the initial voltage to the wireless power transmitter, and iii) generate a second power supply voltage and provide the second power supply voltage to the power supply line; and

a storage capacitor including;

i) a first electrode connected to the gate electrode of the driving transistor and ii) a second electrode connected to the first electrode of the driving transistor,

wherein, while the driving transistor receives the initial power supply voltage, the OLED is configured to receive the second power supply voltage via the power supply line.

16. The pixel of claim 15, wherein the wireless power receiver is formed in a thin film that is interposed between:

i) the substrate and ii) the driving transistor and the switching transistor.

17. The pixel of claim 15, wherein the wireless power receiver is further configured to receive the initial power through a mutual resonance with the external wireless power transmitter.

18. The pixel of claim 17, wherein the wireless power receiver includes:

a power receiver configured to receive alternating current (AC) power;

a rectifier configured to convert the AC power into the initial power supply voltage; and

an impedance matcher configured to match an output impedance of the power receiver and the input impedance of the rectifier.

19. The pixel of claim 17, wherein the wireless power receiver is further configured to wirelessly receive the initial power from the external wireless power transmitter through electromagnetic induction.