Driving method of self-luminous type display unit, display control device of self-luminous type display unit, current output type drive circuit of self-luminous type display unit

• US 20070132674A1
• Filed: 11/29/2004
• Published: 06/14/2007
• Est. Priority Date: 12/02/2003
• Status: Abandoned Application

• Current Assignee: Toshiba Matsushita Display Technology (Japan Display Incorporated)
• Original Assignee: Toshiba Matsushita Display Technology (Japan Display Incorporated)
• Inventors: Tsuge, Hitoshi
• Application Number:
  US10/581,528
• Publication Number:
  US 20070132674A1
• Time in Patent Office: Days
• US Class Current: 345/77
• CPC Class Codes: G09G 2310/0248 Precharge or discharge of column electrodes before or after applying exact column voltages
• CPC Class Codes: G09G 2310/027 Details of drivers for data electrodes, the drivers handling digital grey scale data, e.g. use of D/A converters
• CPC Class Codes: G09G 2310/0289 Details of voltage level shifters arranged for use in a driving circuit
• CPC Class Codes: G09G 2310/0297 Special arrangements with multiplexing or demultiplexing of display data in the drivers for data electrodes, in a pre-processing circuitry delivering display data to said drivers or in the matrix panel, e.g. multiplexing plural data signals to one D/A converter or demultiplexing the D/A converter output to multiple columns
• 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 2320/0238 Improving the black level
• CPC Class Codes: G09G 2320/0242 Compensation of deficiencies in the appearance of colours
• CPC Class Codes: G09G 2320/0247 Flicker reduction other than flicker reduction circuits used for single beam cathode-ray tubes
• CPC Class Codes: G09G 2320/0252 Improving the response speed
• CPC Class Codes: G09G 2320/0276 for the purpose of adaptation to the characteristics of a display device, i.e. gamma correction
• CPC Class Codes: G09G 2320/041 Temperature compensation
• CPC Class Codes: G09G 2320/0693 Calibration of display systems
• CPC Class Codes: G09G 2330/06 Handling electromagnetic interferences [EMI], covering emitted as well as received electromagnetic radiation
• CPC Class Codes: G09G 2330/08 Fault-tolerant or redundant circuits, or circuits in which repair of defects is prepared
• CPC Class Codes: G09G 2340/16 Determination of a pixel data signal depending on the signal applied in the previous frame
• CPC Class Codes: G09G 2360/16 Calculation or use of calculated indices related to luminance levels in display data
• CPC Class Codes: G09G 3/2014 by modulation of the duration of a single pulse during which the logic level remains constant
• CPC Class Codes: G09G 3/2074 using sub-pixels
• CPC Class Codes: G09G 3/3241 the current through the light-emitting element being set using a data current provided by the data driver, e.g. by using a two-transistor current mirror
• 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
• CPC Class Codes: G09G 3/3283 : in which the data driver supplies a variable data current for setting the current through, or the voltage across, the light-emitting elements

Abstract

The method includes applying a gray level current corresponding to a display gray level to each of pixel circuits for a first period, applying a display current based on the gray level current to the self-luminescent elements during a second period succeeding the first period to display corresponding the display gray level, and applying a precharge current to the self-luminescent device during a third period before the first period on the basis of a predetermined first condition.

Claims

1-30. -30. (canceled)

31. A method of driving a self-luminescent display apparatus having self-luminescent elements arranged in a pattern of a matrix and each of pixel circuits provided in association with each of said self-luminescent elements, said method comprising:

applying a gray level current corresponding to a display gray level to each of said pixel circuits for a first period;

applying a display current based on said gray level current to said self-luminescent elements during a second period succeeding said first period to display corresponding said display gray level; and

applying a precharge current to said self-luminescent elements during a third period before said first period on the basis of a predetermined first condition.

32. The method of driving a self-luminescent display apparatus according to claim 31, wherein said third period is varied depending on a display gray level that provides a display current applied to said self-luminescent elements.

33. The method of driving a self-luminescent display apparatus according to claim 31, wherein a current value corresponding to a display gray level of display provided by said self-luminescent elements in a predetermined row on the same column of said matrix is compared with a current value corresponding to a display gray level of display to be provided by said self-luminescent elements in a row next to said predetermined row, and

as said predetermined first condition, if a difference between said current values has a value equal to or larger than at least a predetermined value, when said next row is displayed, the precharge current is applied to said self-luminescent elements in said next row during said third period.

34. The method of driving a self-luminescent display apparatus according to claim 33, wherein said third period is varied depending on the magnitude of said difference.

35. The method of driving a self-luminescent display apparatus according to claim 31, wherein the current value corresponding to the display gray level of the display provided by said self-luminescent elements in the predetermined row on the same column of said matrix is compared with the current value corresponding to the display gray level of the display to be provided by said self-luminescent elements in the row next to said predetermined row, and as said predetermined first condition, if the difference between said current values has a value smaller than a predetermined value, when said self-luminescent elements in said next row provide display, said precharge current is not applied.

36. The method of driving a self-luminescent display apparatus according to claim 33, wherein the current value corresponding to the display gray level of the display provided by said self-luminescent elements in the predetermined row on the same column of said matrix is compared with the current value corresponding to the display gray level of the display to be provided by said self-luminescent elements in the row next to said predetermined row, and as said predetermined first condition, if the difference between said current values has a value smaller than a predetermined value, when said self-luminescent elements in said next row provide display, said precharge current is not applied.

37. The method of driving a self-luminescent display apparatus according to claim 31, wherein as said predetermined first condition, if the display gray level of display provided by said self-luminescent elements has a current value corresponding to black display, when said display gray level is displayed, said precharge current is not applied.

38. The method of driving a self-luminescent display apparatus according to claim 31, wherein a value for said precharge current is a current value corresponding to white display.

39. The method of driving a self-luminescent display apparatus according to claim 31, wherein said third period is selected from a group of third periods corresponding to a plurality of pulse lengths prepared for a driving circuit.

40. The method of driving a self-luminescent display apparatus according to claim 31, further comprising applying a predetermined voltage to said self-luminescent elements during a fourth period before said third period on the basis of a predetermined second condition.

41. The method of driving a self-luminescent display apparatus according to claim 40, wherein the current value corresponding to the display gray level of the display provided by said self-luminescent elements in the predetermined row on the same column of said matrix is compared with the current value corresponding to the display gray level of the display to be provided by said self-luminescent elements in the row next to said predetermined row, and as said predetermined second condition, if the difference between said current values has a value equal to or larger than a predetermined value, when said self-luminescent elements in said next row provide display, said predetermined voltage is applied to said self-luminescent elements in said next row during said fourth period.

42. The method of driving a self-luminescent display apparatus according to claim 40, wherein as said predetermined second condition, if the display gray level of the display provided by said self-luminescent elements has a current value corresponding to the black display, when said display gray level is displayed, said predetermined voltage is applied to said self-luminescent elements during said fourth period.

43. The method of driving a self-luminescent display apparatus according to claim 40, wherein said predetermined voltage is equal to a voltage corresponding to a value for a current applied during a last display provided by said self-luminescent elements or corresponds to low gray level color display.

44. The method of driving a self-luminescent display apparatus according to claim 43, wherein said first voltage corresponds to the voltage for black display.

68. A recording medium on which a program for allowing a computer to execute a step of applying a gray level current corresponding to a display gray level to each of said pixel circuits for a first period, a step of applying a display current based on said gray level current to said self-luminescent elements during a second period succeeding said first period to display the corresponding said display gray level, and a step of applying a precharge current to said self-luminescent device during a third period before said first period on the basis of a predetermined first condition, the steps being included in the method of driving the self-luminescent display apparatus according to claim 31 is recorded, wherein the recording medium can be processed by a computer.

45. A display control device for a self-luminescent display apparatus having self-luminescent elements arranged in a pattern of a matrix and each of pixel circuits provided in association with each of said self-luminescent elements, said self-luminescent display apparatus applying a gray level current corresponding to a display gray level to each of said pixel circuits for a first period, and applying a display current based on said gray level current to said self-luminescent elements during a second period succeeding said first period to display the corresponding said display gray level, said display control device comprising:

precharge current applying instrument of applying a precharge current to said self-luminescent device during a third period before said first period on the basis of a predetermined first condition.

46. The display control device for the self-luminescent display apparatus according to claim 45, wherein said third period is varied depending on a display gray level that provides a display current applied to said self-luminescent elements.

47. The display control device for the self-luminescent display apparatus according to claim 45, wherein a current value corresponding to a display gray level of display provided by said self-luminescent elements in a predetermined row on the same column of said matrix is compared with a current value corresponding to a display gray level of display to be provided by said self-luminescent elements in a row next to said predetermined row, and

as said predetermined first condition, if a difference between said current values has a value equal to or larger than a predetermined value, when said next row is displayed, the precharge current is applied to said self-luminescent elements in said next row during said third period.

48. The display control device for the self-luminescent display apparatus according to claim 47, wherein said third period is varied depending on the magnitude of said difference.

49. The display control device for the self-luminescent display apparatus according to claim 45, wherein the current value corresponding to the display gray level of the display provided by said self-luminescent elements in the predetermined row on the same column of said matrix is compared with the current value corresponding to the display gray level of the display to be provided by said self-luminescent elements in the row next to said predetermined row, and as said predetermined first condition, if the difference between said current values has a value smaller than a predetermined value, when said self-luminescent elements in said next row provide display, a precharge current is not applied.

50. The display control device for the self-luminescent display apparatus according to claim 47, wherein the current value corresponding to the display gray level of the display provided by said self-luminescent elements in the predetermined row on the same column of said matrix is compared with the current value corresponding to the display gray level of the display to be provided by said self-luminescent elements in the row next to said predetermined row, and as said predetermined first condition, if the difference between said current values has a value smaller than a predetermined value, when said self-luminescent elements in said next row provide display, a precharge current is not applied.

51. The display control device for the self-luminescent display apparatus according to claim 45, wherein as said predetermined first condition, if the display gray level of display provided by said self-luminescent elements has a current value corresponding to black display, when said display gray level is displayed, said precharge current is not applied.

52. The display control device for the self-luminescent display apparatus according to claim 45, wherein a value for said precharge current is a current value corresponding to the value for white display.

60. A self-luminescent display apparatus comprising:

self-luminescent elements arranged in a pattern of a matrix;

each of pixel circuits provided in association with each of said self-luminescent elements; and

the display control device for the self-luminescent display apparatus according to claim 45;

wherein said display control device performs an operation for application of said precharge current.

61. The self-luminescent display apparatus according to claim 60, wherein said self-luminescent elements are organic EL elements.

62. An electronic equipment comprising the self-luminescent display apparatus according to claim 61 as a display instrument.

63. The electronic equipment according to claim 62, wherein the electronic apparatus is used as a television.

53. A current output driving circuit for a self-luminescent display apparatus having self-luminescent elements arranged in a pattern of a matrix and each of pixel circuits provided in association with each of said self-luminescent elements, said self-luminescent display apparatus applying a gray level current corresponding to a display gray level to each of said pixel circuits for a first period, and applying a display current based on said gray level current to said self-luminescent elements during a second period succeeding said first period to display corresponding said display gray level, said current output driving circuit applying a precharge current to said self-luminescent device during a third period before said first period on the basis of a predetermined first condition, the current output driving circuit comprising:

third period generating instrument which simultaneously generates a plurality of said third periods having different time lengths.

54. The current output driving circuit for the self-luminescent display apparatus according to claim 53, wherein said plurality of third periods are generated on the basis of pulse lengths used when said precharge current is applied.

55. The current output driving circuit for the self-luminescent display apparatus according to claim 53, wherein said current output driving circuit is used as a current output source driver circuit.

56. A self-luminescent display apparatus comprising:

self-luminescent elements arranged in a pattern of a matrix;

each of pixel circuits provided in association with each of said self-luminescent elements; and

a driving circuit that drives said self-luminescent elements and said pixel circuit,

wherein said driving circuit has at least one of the current output driving circuit according to claim 53.

57. The self-luminescent display apparatus according to claim 56, wherein said self-luminescent elements are organic EL elements.

58. An electronic equipment comprising the self-luminescent display apparatus according to claim 57 as a display instrument.

59. The electronic equipment according to claim 58, wherein the electronic apparatus is used as a television.

64. A self-luminescent display apparatus comprising:

self-luminescent elements arranged in a pattern of a matrix;

each of pixel circuits provided in association with each of said self-luminescent elements; and

an output driving circuit for the self-luminescent display apparatus according to claim 53,

wherein said display control device performs an operation for application of said precharge current.

65. The self-luminescent display apparatus according to claim 64, wherein said self-luminescent elements are organic EL elements.

66. An electronic equipment comprising the self-luminescent display apparatus according to claim 65 as a display instrument.

67. The electronic equipment according to claim 66, wherein the electronic apparatus is used as a television.