ORGANIC EL DISPLAY DEVICE

• US 20110050870A1
• Filed: 09/01/2010
• Published: 03/03/2011
• Est. Priority Date: 09/03/2009
• Status: Abandoned Application

• Current Assignee: Japan Display Central Incorporated (Japan Display Incorporated)
• Original Assignee: Japan Display Central Incorporated (Japan Display Incorporated)
• Inventors: HANARI, Jun
• Application Number:
  US12/873,629
• Publication Number:
  US 20110050870A1
• Time in Patent Office: Days
• US Class Current: 348/56
• CPC Class Codes: G09G 2300/0819 used for counteracting undesired variations, e.g. feedback or autozeroing
• CPC Class Codes: G09G 2300/0852 being a dynamic memory with more than one capacitor
• CPC Class Codes: G09G 2300/0861 with additional control of the display period without amending the charge stored in a pixel memory, e.g. by means of additional select electrodes
• CPC Class Codes: G09G 2320/043 Preventing or counteracting the effects of ageing
• CPC Class Codes: G09G 3/3233 with pixel circuitry controlling the current through the light-emitting element
• CPC Class Codes: H04N 13/341 using temporal multiplexing
• CPC Class Codes: H04N 13/359 Switching between monoscopic and stereoscopic modes

Abstract

According to one embodiment, an organic EL display device includes an organic EL element, a pixel circuit configured to include an output switch which controls emission/non-emission of the organic EL element, and a luminance switching module configured to output to the output switch a first control signal which causes the organic EL element to emit light with a first total emission time per unit time, when a first display mode of displaying a two-dimensional image is selected, and to output to the output switch a second control signal which causes the organic EL element to emit light with a second total emission time, which is longer than the first total emission time, per unit time, when a second display mode of displaying a three-dimensional image is selected.

Claims

1. An organic EL display device comprising:

an organic EL element;

a pixel circuit configured to include an output switch which controls emission/non-emission of the organic EL element; and

a luminance switching module configured to output to the output switch a first control signal which causes the organic EL element to emit light with a first total emission time per unit time, when a first display mode of displaying a two-dimensional image is selected, and to output to the output switch a second control signal which causes the organic EL element to emit light with a second total emission time, which is longer than the first total emission time, per unit time, when a second display mode of displaying a three-dimensional image is selected.

2. The organic EL display device of claim 1, wherein the two-dimensional image is displayed with a first operational frequency in the first display mode, and the three-dimensional image is displayed with a second operational frequency, which is double the first operational frequency, in the second display mode.

3. The organic EL display device of claim 1, wherein the luminance switching module is configured to set a third maximum luminance which is higher than a first maximum luminance in the first display mode and is lower than a second maximum luminance in the second display mode, immediately after the first display mode is switched to the second display mode.

4. The organic EL display device of claim 1, further comprising:

a mode select module configured to select one of the first display mode and the second display mode; and

glasses configured to include optical shutters on a right eye side and a left eye side and to output to the mode select module a glasses operation determination signal for determining that the shutters have operated.

5. The organic EL display device of claim 1, wherein each of the first control signal and the second control signal includes at least one basic control signal for causing the organic EL element to emit light once for a predetermined time, and

the number of the basic control signals included in the unit time of the second control signal is greater than the number of the basic control signals included in the unit time of the first control signal.

6. The organic EL display device of claim 1, wherein each of the first control signal and the second control signal includes the same number of basic control signals each for causing the organic EL element to emit light once, and

an emission time of the organic EL element by one basic control signal included in the second control signal is longer than an emission time of the organic EL element by one basic control signal included in the first control signal.

7. The organic EL display device of claim 1, wherein each of the first control signal and the second control signal includes at least one basic control signal for causing the organic EL element to emit light once, and

the number of the basic control signals included in the unit time of the first control signal is different from the number of the basic control signals included in the unit time of the second control signal, and an emission time of the organic EL element by one basic control signal included in the first control signal is different from an emission time of the organic EL element by one basic control signal included in the second control signal.

8. The organic EL display device of claim 1, further comprising a mode select module configured to output to the luminance switching module a select signal indicating which of the first display mode and the second display mode is to be selected,

wherein the luminance switching module is configured to output, when the select signal which mutually switch the first display mode and the second display mode is input, the first control signal and the second control signal by mutually switching the first control signal and the second control signal, after passing of a predetermined time from the input of the select signal.

9. An organic EL display device comprising:

an organic EL element;

a pixel circuit configured to include a driving transistor which controls driving of the organic EL element; and

a luminance switching module configured to output to the driving transistor a first video signal which causes the organic EL element to emit light with a first luminance when a first display mode of displaying a two-dimensional image is selected, and to output to the driving transistor a second video signal which causes the organic EL element to emit light with a second luminance, which is higher than the first luminance, when a second display mode of displaying a three-dimensional image is selected.

10. The organic EL display device of claim 9, wherein the two-dimensional image is displayed with a first operational frequency in the first display mode, and the three-dimensional image is displayed with a second operational frequency, which is double the first operational frequency, in the second display mode.

11. The organic EL display device of claim 9, wherein the luminance switching module is configured to set a third maximum luminance which is higher than a first maximum luminance in the first display mode and is lower than a second maximum luminance in the second display mode, immediately after the first display mode is switched to the second display mode.

12. The organic EL display device of claim 9, further comprising:

a mode select module configured to select one of the first display mode and the second display mode; and

glasses configured to include optical shutters on a right eye side and a left eye side and to output to the mode select module a glasses operation determination signal for determining that the shutters have operated.

13. The organic EL display device of claim 9, wherein the luminance switching module includes a signal conversion module configured to convert video data, which is supplied from outside, to an analog video signal which is output to the pixel circuit, and

the signal conversion module is configured to execute conversion with respect to video data having the same gradation in a manner that an absolute value of the second video signal, which is converted in the second display mode, is made greater than an absolute value of the first video signal which is converted in the first display mode.

14. The organic EL display device of claim 9, wherein the luminance switching module includes a signal conversion module configured to convert video data, which is supplied from outside, to an analog video signal which is output to the pixel circuit, and

the signal conversion module is configured to execute conversion such that a dynamic range after conversion in the second display mode is made larger than a dynamic range after conversion in the first display mode, and executes conversion with respect to video data having the same gradation in a manner that an absolute value of the second video signal, which is converted in the second display mode, is made greater than an absolute value of the first video signal which is converted in the first display mode.

15. The organic EL display device of claim 9, further comprising a mode select module configured to output to the luminance switching module a select signal indicating which of the first display mode and the second display mode is to be selected,

wherein the luminance switching module is configured to output, when the select signal which mutually switch the first display mode and the second display mode is input, the first control signal and the second control signal by mutually switching the first control signal and the second control signal, after passing of a predetermined time from the input of the select signal.

16. An organic EL display device comprising:

a plurality of pixel units arranged in a matrix on a substrate;

a signal line provided in association with each of columns, connected to the associated pixel units of the associated column, and configured to supply a signal corresponding to a video signal to the associated pixel units;

a select scanning line provided in association with each of rows, connected to the associated pixel units of the associated row, and configured to supply to the associated pixel units a signal which selects the pixel units in units of a row corresponding to the video signal;

a light-control scanning line provided in association with each of the rows, connected to the pixel units of the same emission light color of the associated row, and configured to supply a control signal which controls an emission period of organic EL elements of the pixel units in units of a selected row; and

a luminance switching module configured to output to the light-control scanning line a first control signal which causes the organic EL elements to emit light with a first total emission time per unit time, when a first display mode of displaying a two-dimensional image is selected, and to output to the light-control scanning line a second control signal which causes the organic EL elements to emit light with a second total emission time, which is longer than the first total emission time, per unit time, when a second display mode of displaying a three-dimensional image is selected.

17. The organic EL display device of claim 16, wherein the two-dimensional image is displayed with a first operational frequency in the first display mode, and the three-dimensional image is displayed with a second operational frequency, which is double the first operational frequency, in the second display mode.

18. An organic EL display device comprising:

a plurality of pixel units arranged in a matrix on a substrate;

a signal line provided in association with each of columns, connected to the associated pixel units of the associated column, and configured to supply a signal corresponding to a video signal to the associated pixel units;

a select scanning line provided in association with each of rows, connected to the associated pixel units of the associated row, and configured to supply to the associated pixel units a signal which selects the pixel units in units of a row corresponding to the video signal;

a light-control scanning line provided in association with each of the rows, connected to the pixel units of the same emission light color of the associated row, and configured to supply a control signal which controls an emission period of organic EL elements of the pixel units in units of a selected row; and

a luminance switching module configured to output to the signal line a first video signal which causes the organic EL elements to emit light with a first luminance when a first display mode of displaying a two-dimensional image is selected, and to output to the signal line a second video signal which causes the organic EL elements to emit light with a second luminance, which is higher than the first luminance, when a second display mode of displaying a three-dimensional image is selected.

19. The organic EL display device of claim 18, wherein the two-dimensional image is displayed with a first operational frequency in the first display mode, and the three-dimensional image is displayed with a second operational frequency, which is double the first operational frequency, in the second display mode.

20. A display method of an organic EL display device, the organic EL display device including an organic EL element, a pixel circuit configured to include an output switch which controls emission/non-emission of the organic EL element, and a luminance switching module configured to output to the output switch a control signal which causes the organic EL element to emit light, the display method comprising:

outputting to the output switch a first control signal which causes the organic EL element to emit light with a first total emission time per unit time, when a first display mode of displaying a two-dimensional image is selected; and

outputting to the output switch a second control signal which causes the organic EL element to emit light with a second total emission time, which is longer than the first total emission time, per unit time, when a second display mode of displaying a three-dimensional image is selected.