STRETCHABLE DISPLAY DEVICES AND METHODS OF COMPENSATING LUMINANCE OF THE SAME

• US 20160077553A1
• Filed: 03/27/2015
• Published: 03/17/2016
• Est. Priority Date: 09/15/2014
• 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
• Granted Patent: US 9,477,339 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: G06F 2203/04102 Flexible digitiser, i.e. constructional details for allowing the whole digitising part of a device to be flexed or rolled like a sheet of paper
• CPC Class Codes: G06F 3/0412 Digitisers structurally integrated in a display
• CPC Class Codes: G06F 3/045 using resistive elements, e.g. a single continuous surface or two parallel surfaces put in contact
• CPC Class Codes: G09G 2320/0223 Compensation for problems related to R-C delay and attenuation in electrodes of matrix panels, e.g. in gate electrodes or on-substrate video signal electrodes
• CPC Class Codes: G09G 2320/0233 Improving the luminance or brightness uniformity across the screen
• CPC Class Codes: G09G 2320/0666 for control of colour parameters, e.g. colour temperature
• CPC Class Codes: G09G 2330/021 Power management, e.g. power saving
• CPC Class Codes: G09G 2330/12 Test circuits or failure detection circuits included in a display system, as permanent part thereof
• CPC Class Codes: G09G 3/035 for flexible display surfaces
• CPC Class Codes: G09G 3/3208 organic, e.g. using organic light-emitting diodes [OLED]
• CPC Class Codes: G09G 3/3225 using an active matrix
• CPC Class Codes: G09G 3/3611 Control of matrices with row and column drivers

Abstract

A stretchable display device includes: a stretchable display panel including: pixels; a first resistive film extending in a first direction; and a second resistive film extending in a second direction; a scan driver to provide a scan signal to the pixels; a data driver to provide a data signal or a compensated data signal to the pixels; a row detection driver to detect a first current flowing through the first resistive film to generate a first detection signal; a column detection driver to detect a second current flowing through the second resistive film to generate a second detection signal; a compensation control signal generator to receive the first and the second detection signals to detect amounts of variations of the first and the second currents, and to generate a compensation control signal; and a timing controller to generate the compensated data signal based on the compensation control signal.

Claims

1. A stretchable display device comprising:

a stretchable display panel comprising;

a plurality of pixels;

at least one first resistive film extending in a first direction; and

at least one second resistive film extending in a second direction crossing the first direction on the stretchable display panel;

a scan driver configured to provide a scan signal to the pixels via a plurality of scan-lines;

a data driver configured to provide a data signal or a compensated data signal to the pixels via a plurality of data-lines;

a row detection driver configured to detect a first current flowing through the first resistive film to generate a first detection signal corresponding to the first current;

a column detection driver configured to detect a second current flowing through the second resistive film to generate a second detection signal corresponding to the second current;

a compensation control signal generator configured to receive the first detection signal to detect an amount of variation of the first current, to receive the second detection signal to detect an amount of variation of the second current, and to generate a compensation control signal based on the amount of the variation of the first current and the amount of the variation of the second current; and

a timing controller configured to control the scan driver and the data driver, and to generate the compensated data signal based on the compensation control signal.

2. The stretchable display device of claim 1, wherein the compensation control signal includes at least one selected from a first digital signal and a second digital signal,

wherein the first digital signal corresponds to a row location of the pixels to which the compensated data signal is to be applied, and

wherein the second digital signal corresponds to a column location of the pixels to which the compensated data signal is to be applied.

3. The stretchable display device of claim 2, wherein the first detection signal and the second detection signal are signals corresponding to respective voltages, and

wherein each of the row detection driver and the column detection driver comprises at least one current-voltage conversion circuit.

4. The stretchable display device of claim 3, wherein the compensation control signal generator comprises:

a first voltage comparator configured to compare the first detection signal with a first reference voltage to output a first comparison signal;

a second voltage comparator configured to compare the second detection signal with a second reference voltage to output a second comparison signal;

a first analog-digital converter configured to perform an analog-digital converting operation on the first comparison signal to generate the first digital signal; and

a second analog-digital converter configured to perform an analog-digital converting operation on the second comparison signal to generate the second digital signal.

5. The stretchable display device of claim 4, wherein the compensation control signal generator further comprises:

a first voltage amplifier configured to amplify the first detection signal; and

a second voltage amplifier configured to amplify the second detection signal.

6. The stretchable display device of claim 4, wherein the compensation control signal generator further comprises:

a third voltage amplifier configured to amplify the first comparison signal; and

a fourth voltage amplifier configured to amplify the second comparison signal.

7. The stretchable display device of claim 2, wherein the first detection signal and the second detection signal are signals corresponding to respective currents, and

wherein each of the row detection driver and the column detection driver comprises at least one current sensing circuit.

8. The stretchable display device of claim 7, wherein the compensation control signal generator comprises:

a first current comparator configured to compare the first detection signal with a first reference current to output a first comparison signal;

a second current comparator configured to compare the second detection signal with a second reference current to output a second comparison signal;

a first analog-digital converter configured to perform an analog-digital converting operation on the first comparison signal to generate the first digital signal; and

a second analog-digital converter configured to perform an analog-digital converting operation on the second comparison signal to generate the second digital signal.

9. The stretchable display device of claim 8, wherein the compensation control signal generator further comprises:

a first current amplifier configured to amplify the first detection signal; and

a second current amplifier configured to amplify the second detection signal.

10. The stretchable display device of claim 8, wherein the compensation control signal generator further comprises:

a first voltage amplifier configured to amplify the first comparison signal; and

a second voltage amplifier configured to amplify the second comparison signal.

11. The stretchable display device of claim 1, wherein the stretchable display device comprises an organic light emitting display device that comprises a power supply configured to provide a high power voltage and a low power voltage to the pixels via a plurality of power-lines.

12. The stretchable display device of claim 1, wherein the stretchable display device comprises a liquid crystal display device that comprises a backlight unit configured to provide light to the stretchable display panel.

13. A stretchable display device comprising:

a stretchable display panel comprising;

a plurality of pixels;

at least one first resistive film extending in a first direction; and

at least one second resistive film extending in a second direction crossing the first direction on the stretchable display panel;

a scan driver configured to provide a scan signal to the pixels via a plurality of scan-lines;

a data driver configured to provide a data signal to the pixels via a plurality of data-lines;

a row detection driver configured to detect a first current flowing through the first resistive film to generate a first detection signal corresponding to the first current;

a column detection driver configured to detect a second current flowing through the second resistive film to generate a second detection signal corresponding to the second current;

a compensation control signal generator configured to receive the first detection signal to detect an amount of variation of the first current, to receive the second detection signal to detect an amount of variation of the second current, and to generate a compensation control signal based on the amount of the variation of the first current and the amount of the variation of the second current;

a timing controller configured to control the scan driver and the data driver; and

a power supply configured to generate a compensated power voltage based on the compensation control signal, and to provide a power voltage or the compensated power voltage to the stretchable display panel via a plurality of power-lines.

14. The stretchable display device of claim 13, wherein the stretchable display device comprises an organic light emitting display device, and

wherein the power supply is configured to generate the compensated power voltage by compensating at least one selected from a high power voltage and a low power voltage that are to be applied to the pixels.

15. The stretchable display device of claim 13, wherein the compensation control signal includes at least one selected from a first digital signal and a second digital signal,

wherein the first digital signal corresponds to a row location of the pixels to which the compensated power voltage is to be applied, and

wherein the second digital signal corresponds to a column location of the pixels to which the compensated power voltage is to be applied.

16. The stretchable display device of claim 15, wherein the first detection signal and the second detection signal are signals corresponding to respective voltages, and

wherein each of the row detection driver and the column detection driver comprises at least one current-voltage conversion circuit.

17. The stretchable display device of claim 16, wherein the compensation control signal generator comprises:

a first voltage comparator configured to compare the first detection signal with a first reference voltage to output a first comparison signal;

a second voltage comparator configured to compare the second detection signal with a second reference voltage to output a second comparison signal;

a first analog-digital converter configured to perform an analog-digital converting operation on the first comparison signal to generate the first digital signal; and

a second analog-digital converter configured to perform an analog-digital converting operation on the second comparison signal to generate the second digital signal.

18. The stretchable display device of claim 15, wherein the first detection signal and the second detection signal are signals corresponding to respective currents, and

wherein each of the row detection driver and the column detection driver comprises at least one current sensing circuit.

19. The stretchable display device of claim 18, wherein the compensation control signal generator comprises:

a first current comparator configured to compare the first detection signal with a first reference current to output a first comparison signal;

a second current comparator configured to compare the second detection signal with a second reference current to output a second comparison signal;

a first analog-digital converter configured to perform an analog-digital converting operation on the first comparison signal to generate the first digital signal; and

a second analog-digital converter configured to perform an analog-digital converting operation on the second comparison signal to generate the second digital signal.

20. A method of compensating luminance of a stretchable display device, the method comprising:

detecting a current flowing through a resistive film formed on a stretchable display panel;

generating a compensation control signal based on an amount of variation of the current; and

compensating a data signal or a power voltage to be applied to the stretchable display panel based on the compensation control signal.