WO2000055836A1 - Afficheur electroluminescent organique - Google Patents

Afficheur electroluminescent organique Download PDF

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Publication number
WO2000055836A1
WO2000055836A1 PCT/JP2000/000680 JP0000680W WO0055836A1 WO 2000055836 A1 WO2000055836 A1 WO 2000055836A1 JP 0000680 W JP0000680 W JP 0000680W WO 0055836 A1 WO0055836 A1 WO 0055836A1
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WO
WIPO (PCT)
Prior art keywords
data
display
organic
drive circuit
circuit
Prior art date
Application number
PCT/JP2000/000680
Other languages
English (en)
Japanese (ja)
Inventor
Hirotada Furukawa
Yoshihiro Saitoh
Original Assignee
Tdk Corporation
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Publication date
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Publication of WO2000055836A1 publication Critical patent/WO2000055836A1/fr

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Classifications

    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
    • G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
    • G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
    • G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
    • G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
    • G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
    • G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
    • G09G3/3225—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/02—Improving the quality of display appearance
    • G09G2320/0233—Improving the luminance or brightness uniformity across the screen
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/02—Improving the quality of display appearance
    • G09G2320/0242—Compensation of deficiencies in the appearance of colours

Definitions

  • the present invention relates to an organic electroluminescent (EL) display technology.
  • the present invention relates to a technique for accurately adjusting the luminance of each different color in an organic EL display device that emits a plurality of colors to prevent luminance unevenness.
  • the organic EL device is a charge injection / recombination EL device using an organic substance as a light emitting material.
  • Display devices in which organic EL light-emitting elements are arranged in a segment, matrix, or hybrid shape have thin, high-brightness, high viewing angle, and high resolution characteristics. R & D is being actively conducted with the aim of high-performance dani.
  • Such a display device is being put into practical use as a monochromatic display device having a constant luminance.
  • a partial color display device having a display surface with a partially different emission color, and a display device capable of emitting light in several colors will be used. It is expected to be put to practical use as a full-color display device that combines multicolor light emission and gradation control.
  • the three-color light-emitting structure materials that emit light in three colors of R, G, and B are arranged.
  • the R-color light emitting layers 102-1 and B2-1 are formed on a glass substrate 100 via a transparent electrode 101 made of, for example, silicon oxide tin (IT0).
  • the color light-emitting layer 102-2 and the G-color light-emitting layer 102-3 are arranged, and the aluminum electrode 103 is provided thereon.
  • the three primary colors of R, G, and B can be emitted.
  • the color filter type structure combines a white light-emitting layer with RGB color filters.
  • a white light-emitting layer For example, as shown in Fig. 34 (B), on a glass substrate 100, an R color filter 105, a B color filter 105, and a G color filter 10 5-3 is placed on its own, ITO 101 is placed on it via an overcoat 104, a white light emitting layer 102 is overlaid thereon, and an aluminum electrode 103 is further provided.
  • the light emitted from the white light-emitting layer 102 passes through the R color filter 105-1, the B color filter 105-5-2, and the G color filter 105-5 so that R ⁇ Three primary colors of B and G are obtained.
  • the fluorescence conversion structure combines a blue light emitting layer and a fluorescence conversion layer.
  • an R-color fluorescence conversion layer 106_1, a B-color fluorescence conversion layer 106-6-2, and a G-color fluorescence conversion layer 1 are formed on a glass substrate 100.
  • 06-3 is arranged, ITO 101 is arranged on it via an overcoat 104, a blue light emitting layer 107 is overlaid thereon, and an aluminum electrode 103 is further provided thereon. .
  • the light emitted from the blue light-emitting layer 107 is converted to R and B by the R-color fluorescence conversion layer 106-1, the B-color fluorescence conversion layer 106_2, and the G-color fluorescence conversion layer 106-6-3, respectively.
  • ⁇ Fluorescent color of G is output, and the three primary colors of RGB are obtained.
  • the drive electrode is different for each of R, G, and B regardless of the structure of any of the above three types.
  • the R, G, and B light-emitting layers have different voltage-luminance characteristics. This is because the conversion efficiencies of R, G, and B are different in the structure. Also, since R, G, and B have different human luminous sensitivities, even if the absolute luminance is the same, In terms of sensitivity, the brightness looks different. Therefore, it is necessary to adjust the brightness by RGB.
  • brightness adjustment in a non-nel structure There are two types of brightness adjustment methods: brightness adjustment in a non-nel structure and brightness adjustment by drive control.
  • the brightness is adjusted by providing an overcoat having different transmittance on the display unit.
  • luminance is adjusted by controlling the peak value of the drive voltage or current applied to each of R, G, and B, and the pulse width of the drive voltage or current.
  • a partial color display device in which a plurality of colors are partially present As shown in Figs. 35 (A), (B) and (C), a partial color display device in which a plurality of colors are partially present, and as shown in Figs. 36 (A) and (B)
  • the emitted color is not limited to R, G, and B, and an arbitrary emitted color is used according to a purpose or preference. It becomes mixed. Therefore, when overcoating is performed on such a display device in order to make the luminance uniform, there is a disadvantage that the process is complicated.
  • the method of adjusting the luminance by the peak value of the driving voltage (current) and the pulse width is known as the LED driving technology.
  • Japanese Patent No. 276 1728 discloses a technique for controlling the luminance of an LED matrix display by controlling the duty of a drive pulse.
  • the technique described in this patent is intended to adjust the overall luminance, and adjusts the luminance for each emission color as required in a partial color display device or a multi-color display device. It is not possible.
  • Japanese Unexamined Patent Publication No. Sho 63-2878797 and Japanese Patent Publication No. 415659/1985 disclose a method of adjusting the brightness of a multicolor color display device having a matrix structure. Another technique to do Proposed.
  • the control proposed by these patent applications uses a multi-level drive circuit that requires PWM (pulse width modulation) control in the drive circuit, so it is suitable for full-color display devices, but it is suitable for partial power display. It is expensive to use in relatively inexpensive displays, such as devices and multicolor displays.
  • the devices proposed by these patent applications have the disadvantage that the number of drive circuits is increased.
  • Japanese Patent Application Publication No. 63-1696990 discloses an LED driving device in which luminance is adjusted by current control and duty control. This device requires delicate control with difficulty to control the current, and has the problem of increasing the number of drive circuits. Further, the duty control is intended to control a single element, and cannot be applied to a display having a matrix configuration.
  • Japanese Patent Application Laid-Open No. 59-43496 proposes an LED driving device which has a relatively simple configuration and performs brightness adjustment based on duty control. However, the device proposed here cannot control the brightness adjustment independently for each element, so it cannot cope with the difference in current-luminance characteristics between different elements.
  • This organic EL display includes an organic EL display 110.
  • a scanning-side drive circuit 90 and a plurality of data-side drive circuits that is, a data-side first drive circuit 92 and a data-side second drive circuit 9 3.
  • a third drive circuit 94 on the data side and a fourth drive circuit 95 on the data side are provided.
  • the driving circuits 92, 93, 94, and 95 are respectively the first connection means 96 on the data side, the second connection means 97 on the data side, and the third connection means 98 on the data side.
  • the display unit 110 is connected by the fourth connection means 99 on the data side.
  • a display controller 112 is provided to control the operation of the display 110, and the display controller 112 includes a microcomputer 111 and a memory 113, a data bus and an address bus. And via a control line. Microcomputer overnight 1 1 1 and display controller 1 1 2 are clocked from oscillators 1 1 4 and 1 1 5 respectively. A lock signal is provided. The output of the display controller 112 is connected to each drive circuit.
  • the organic EL display 110 includes, for example, a display panel as shown in FIG. 35 (A).
  • the microcomputer 111 is operated via input means (not shown), and the display data is held in the memory 113.
  • the display data is read out again by the microcomputer 111 and processed.
  • the data-side first drive circuit 92 to the data-side fourth drive circuit 95 are used to transfer one line of data in the X-axis direction in the X-axis direction based on the latch pulse LP via the display controller 112.
  • the scan-side drive signal is applied from the scan-side drive circuit 90 to the first scan line, the display of the organic EL display 110 in the first scan-line direction is de-assembled based on this data. It is controlled to display overnight.
  • the address bus outputs addresses for accessing the memory 113 and the internal memory of the display controller 112 from the microcomputer 111.
  • the overnight bus is used to input and output access data to and from the internal memory of the memory 113 and the display controller 112.
  • the control lines are clocks for data transfer and shift register clocks. Such control signals are transmitted.
  • Each connection circuit operates to transmit the output of each drive circuit to the organic EL display.
  • the enable signal EN originally has the property of forcibly turning off the scanning line signal or the data line signal, and simply drives each drive circuit as shown in Fig. 37. If this is the case, the enable signal EN is not required, so the enable signal EN is omitted in this figure.
  • FIG. 38 shows an example of a circuit for controlling an organic EL element having a width of 64 bits.
  • This multi-level drive circuit 1 1 6 includes a bidirectional shift register 1 17, a 6-bit width latch 1 18 and a decoder 1 19 connected in order, and the output of the decoder 1 19 is a 64-bit width AND circuit 1 2 0 Is connected to one input.
  • the output of the data control 122 which receives the 8-bit parallel data D0 to D7, is connected to the bidirectional shift register 117.
  • the latch pulse LP is input to the latch 118.
  • the output of the gray scale control 123 is supplied to the decoder 119.
  • the other input of the AND circuit 120 is supplied with an enable signal EN, and the output of the AND circuit 120 is input to a 64 bit organic EL driver 21.
  • the output of the voltage control 124 is provided to the organic EL driver 121.
  • the 8-bit parallel data D0 to D7 transmitted from the display controller 3 are converted to serial data by the data control 122 and transmitted to the bidirectional shift register 117. You. These data are held in the bidirectional shift register 117 for a total of 64 bits in width, and then held in the latch 118 by the latch pulse LP.
  • the grayscale control 1 2 3 is reset by the reset signal RES, and the grayscale control signal is divided by the basic signal for grayscale control input to the GSC pin, and the control that matches the required grayscale is performed.
  • the clock is output to decoder 119.
  • the decoder 119 generates a pulse having a width corresponding to the gradation in accordance with the gradation data transferred from the latch 118 in synchronization with the control signal from the grayscale control 123. This pulse is transmitted to the organic EL driver 122.
  • the AND circuit 120 is arranged between the decoder 119 and the organic EL driver 121 in order to enable the enable signal when performing a power save.
  • the AND circuit 120 is an interface for converting the display data including the gradation transferred from the decoder 119 from the logic voltage Vcc to the panel drive voltage VDDH.
  • a drive voltage is generated together with the voltage controller 124 that generates the voltage, and the drive voltage is supplied to the panel through the organic EL driver 21. Supply pressure.
  • the multi-level drive circuit 116 requires a grayscale control 123-decoder 118 in the configuration, so that the circuit configuration becomes complicated and expensive.
  • An object of the present invention is to provide an organic EL display device capable of performing color display, in particular, a partial color display device which is relatively inexpensive compared with a full-color display device and capable of displaying more variously than a monochrome display device. is there.
  • Another object of the present invention is to provide a driving means capable of driving a multicolor color display device with high luminance without uneven brightness.
  • FIG. 1 shows the principle of the present invention.
  • the color display device according to the present invention includes an organic EL display 1, a microcomputer 2, a display controller 3, and a memory, similarly to the conventional display device shown in FIG.
  • the display 1 is connected to the scanning-side drive circuit through the connecting means 6 so that the data-side first connecting means 11, the data-side second connecting means 12, the data-side third connecting means and the data-side fourth connecting means are connected.
  • the data-side first drive circuit 7, the data-side second drive circuit 8, the data-side third drive circuit 9, and the data-side fourth drive circuit 10 are connected to each other via the connection means 14.
  • Clock oscillators 15 and 16 are connected to the microcomputer 2 and the display controller 3, respectively.
  • the luminance of the organic EL display device is determined by the time integration of the current density, the luminance can be changed by controlling the drive voltage or the duty ratio of the current. Therefore, the brightness can be adjusted by adjusting the enable signal EN, and a high-quality display device without uneven brightness can be provided.
  • the present invention provides an organic EL display device provided with a display in which an organic EL light emitting element is arranged between a plurality of scanning lines and a plurality of data lines in order to achieve the above-mentioned object.
  • the display device includes: a scan-side drive circuit that applies a voltage to the display via a scan electrode; A binary output data drive circuit for applying a voltage to the display via the data line S is provided. Further, a control means for controlling a drive duty of a drive control signal applied to at least one of the scan side drive circuit and the data side drive circuit is provided to partially adjust the luminance of the display.
  • an organic EL display device has a function in which a display emits light of two or more colors.
  • this display device by controlling the driving duty of at least one of the driving signals of the scanning-side driving circuit or the data-side driving circuit, the light emission luminance for each color of the display device is adjusted, or different light emission is performed. Colors can be mixed to emit light in any color mixture.
  • an organic EL display device is configured as a partial color display in which a display section is configured by at least two or more light-emitting regions, and a scanning-side drive circuit and a data-side drive circuit.
  • the luminance for each emission color can be adjusted.
  • the duty of the drive pulse at the data electrode driven by at least one of the data electrode drive circuits may be different from the duty of the drive pulse at the data electrode driven by another drive circuit. it can.
  • the display device is provided with a control microcomputer, and the control microcomputer inputs an enable signal to a drive circuit for driving the data electrode and drives the data side drive circuit differently. It may be driven at a duty.
  • a display device is provided with a multivibrator, and a signal based on the output of the multivibrator is input as an enable signal to a drive circuit for driving a data electrode, and the drive circuit is driven on the data side.
  • Circuits can be driven with different drive duties. At least two types of duty of the drive pulse for the scanning electrode can be provided.
  • the control microcomputer can input an enable signal to the scanning side driving circuit for driving the scanning electrodes and drive the scanning side driving circuit with different driving duty. it can.
  • a signal based on the output of the multivibrator can be input to the scan electrode drive circuit as an enable signal.
  • the display of the organic EL display device is configured to be capable of multicolor display by using two or more kinds of emission colors and a mixed color thereof.
  • a scan-side drive circuit for applying a voltage to the display via the scan electrode; a binary output data-side drive circuit for applying a voltage to the display via the data S; a scan-side drive circuit;
  • a control means for controlling a drive duty of a drive control signal applied to at least one of the evening drive circuit is provided to adjust the luminance of the display color of the display.
  • the duty of the drive pulse at the drive electrode driven by at least one of the drive circuits driving the drive electrode is different from the duty of the drive noise at the drive electrode driven by another drive circuit. Can be different.
  • a control microcomputer inputs an enable signal to a drive circuit that drives the data electrodes, and drives the data drive circuit with a different drive duty.
  • a multi-vibrator is provided, and a signal based on the output of the multi-vibrator is input as an enable signal to a drive circuit for driving the data electrode, and the data-side drive circuit is driven at a different drive duty. You can also. Also in this case, it is preferable to provide at least two types of duty of the scan electrode drive pulse.
  • the control microcomputer inputs the enable signal to the drive circuit that drives the scan electrodes, and drives the scan-side drive circuit with different drive duties. Also in this case, since the multi-vibrator is provided and the scan electrode side drive circuit is driven with different drive duties, a signal based on the output of the multi-noise breaker can be input to the scan electrode side drive circuit as an enable signal.
  • the scanning drive circuit and the binary output data drive Since luminance can be adjusted by controlling the duty of the driving pulse output from at least one of the circuits, luminance unevenness can be eliminated for a display device having different luminance depending on colors.
  • a display device without luminance unevenness can be provided by an inexpensive binary drive circuit.
  • the brightness can be easily adjusted by an inexpensive binary drive circuit, so that a high-quality display device without luminance unevenness can be provided at extremely low cost. Since luminance can be adjusted with a panel having two or more luminescent colors, it is possible to provide a high-quality display device without luminance unevenness not only for a partial color display device but also for a multicolor color display device.
  • the luminance for each emission color is adjusted, so that there is no luminance unevenness even for the partial color panel display device. , It can be of high quality.
  • the drive circuit for driving the data electrodes controls the duty of the drive pulse of the data electrode differently, so that the brightness can be adjusted in a partial color display, for example, as shown in Fig. 35 (B). High quality without unevenness can be obtained. further.
  • the brightness can be adjusted without increasing the circuit scale in the partial color display Becomes Also, when using a logic circuit that uses a multi-vibrator to drive the data electrode drive circuit with a different drive duty, a relatively simple circuit is added to the partial color display. It is possible to adjust the brightness without unevenness of the brightness. Moreover, an inexpensive binary drive circuit can be used. By providing at least two types of scan electrode drive pulse duties, the brightness of a partial color display can be adjusted, and a high-quality display device without uneven brightness can be obtained.
  • the circuit scale It is possible to adjust the luminance without increasing the luminance, and it is possible to obtain a high quality display device with uneven luminance. Even when a driving pulse with a different driving duty is applied to the scanning electrode driving circuit using a logic circuit using a multi-vibration device, a relatively simple circuit is added to the partial color display only by adding a relatively simple circuit. The brightness can be adjusted without uneven brightness. Moreover, it can be configured with an inexpensive binary drive circuit.
  • FIG. 1 is a schematic diagram of an organic EL display device illustrating the principle of the present invention.
  • FIG. 2 is a circuit diagram showing one example of an EN output control circuit used in the present invention.
  • FIG. 3 is an illustration for explaining the function of the enable signal EN in the present invention.
  • FIGS. 4A and 4B are diagrams showing an embodiment of the present invention, wherein FIG. 4A is a schematic diagram showing the entire organic EL display device, and FIGS. 4B and 4C show the configuration of a display device to be controlled.
  • FIG. 4A is a schematic diagram showing the entire organic EL display device
  • FIGS. 4B and 4C show the configuration of a display device to be controlled.
  • FIG. 4A is a schematic diagram showing the entire organic EL display device
  • FIGS. 4B and 4C show the configuration of a display device to be controlled.
  • FIG. 5 is a circuit diagram showing an example of a binary drive circuit that can be used in the embodiment of FIG.
  • FIG. 6 is a flowchart showing a control flow in the embodiment of FIG.
  • FIGS. 7A and 7B are diagrams showing a second embodiment of the present invention, in which FIG. 7A is a schematic diagram showing the entire organic EL display device, and FIG. 7B is a diagram showing the configuration of a display to be controlled. .
  • FIG. 8 is a diagram showing a configuration of a display to be controlled in another embodiment of the present invention.
  • FIGS. 9A and 9B are diagrams showing still another embodiment of the present invention, in which FIG. 9A is a schematic diagram showing the entire organic EL display device, and FIG. 9B is a diagram showing the configuration of a display device to be controlled. is there.
  • FIG. 10 is a view similar to FIG. 1 showing still another embodiment of the present invention.
  • FIG. 11 is a view similar to FIG. 1 showing another embodiment of the present invention.
  • FIG. 12 shows an EN output control circuit used in still another embodiment of the present invention.
  • FIG. 4 is a circuit diagram showing an example of the embodiment.
  • FIG. 13 is a circuit diagram showing an example of an EN output control circuit 1 used in still another embodiment M of the present invention.
  • FIG. 14 is a circuit diagram showing an example of an EN output control circuit used in still another embodiment of the present invention.
  • FIG. 15 is a circuit diagram similar to FIG. 14 showing an example of the EN output control circuit used in still another embodiment of the present invention.
  • FIG. 16 is a circuit diagram showing an example of an EN output control circuit used in another embodiment of the present invention.
  • FIG. 17 is a view similar to FIG. 1 showing still another embodiment of the present invention.
  • FIG. 18 is a circuit diagram showing an example of an EN output control circuit used in still another embodiment of the present invention.
  • FIG. 19 is a view similar to FIG. 1 showing still another embodiment of the present invention.
  • FIG. 20 is a diagram showing a configuration of a display to be controlled in the embodiment of the present invention.
  • FIG. 21 is a flowchart showing luminance adjustment control in the display shown in FIG.
  • FIG. 22 is a diagram illustrating another example of the configuration of the display device to be controlled in the embodiment of the present invention.
  • FIG. 23 is a flowchart showing luminance adjustment control in the display shown in FIG.
  • FIGS. 24A and 24B show still another embodiment of the present invention, wherein FIG. 24A is an overall configuration diagram similar to FIG. 1, and FIG. 24B is a diagram of a display to be controlled.
  • FIGS. 25A and 25B show still another embodiment of the present invention, in which FIG. 25A is an overall configuration diagram similar to FIG. 1, and FIG. 25B is a diagram of a display to be controlled.
  • FIG. 26 is a circuit diagram showing an EN output control circuit that can be used in one embodiment of the present invention.
  • FIG. 27 is a circuit diagram showing an EN output control circuit that can be used in another embodiment of the present invention.
  • FIG. 28 is a view similar to FIG. 1 showing still another embodiment of the present invention.
  • FIG. 29 is a view similar to FIG. 1 showing still another embodiment of the present invention.
  • FIG. 30 is a schematic diagram showing an example of a display pattern according to the present invention.
  • FIG. 31 is a diagram showing some examples of gradation display in the display device of the present invention.
  • FIG. 32 is a diagram showing an example of data transfer in the present invention.
  • FIG. 33 is a diagram showing an example of display data in the present invention.
  • FIG. 34 is a detailed view showing some configuration examples of the organic EL display device for explaining the problem of the present invention.
  • FIG. 35 is a diagram showing some examples of a partial color display device for explaining the problem of the present invention.
  • FIG. 36 is a diagram showing some examples of a multicolor color display device for explaining the problem of the present invention.
  • FIG. 37 is a schematic diagram showing a configuration of an organic EL display device according to a conventional technique.
  • FIG. 38 is a block diagram illustrating an example of a multi-level drive circuit used in the display device of FIG.
  • FIG. 2 is a circuit diagram showing a configuration of an EN output control circuit according to the present invention
  • FIG. 3 is a table illustrating a function of an enable signal EN according to the present invention.
  • the overall size is 25 6 x 64 dots, of which the blue area is 256 x 48 dots and the green area is 2
  • the green area is 2
  • the EN output control circuit includes a counter that uses the input of the latch pulse LP as a clock signal and the vertical scanning start signal as a reset signal.
  • the output of the counter 20 is connected to one input of each of the first comparator 23 and the second comparator 24.
  • the other input of the first comparator 23 has the output of the brightness control start scanning line number input section 21, and the other input of the second comparator 24 has the output of the brightness control end scanning line number input section 22.
  • the output a of the first comparator 23 and the output b of the second comparator 24 are connected to two inputs of the OR circuit 25, respectively.
  • the output of the OR circuit 25 is connected to one input of a D flip-flop (DFF) 26.
  • the output b of the second comparator 24 is connected to the D input of DFF 26.
  • the Q output of DFF 26 is connected to the reset input of one-shot multivibrator 27.
  • a latch pulse is input to the B input of the one-shot multivibrator 27 as a clock signal.
  • Enable signal / EN is output from the / Q terminal of the one-shot multivibrator.
  • the one-shot multivibrator evening 2 7 C x end Kooyobi R x / C x terminal of the DC power supply V ec is connected through an RC circuit having a variable resistor R and a capacitor C. In the example shown in FIG.
  • the luminance control start scanning line number input section 21 has a decimal number “4 8” in the luminance control end scanning line number input section 22. Is set in binary notation, each of the decimal numbers "6 4".
  • the input format of the numerical value to be set may be another format.
  • the counter 20 When the vertical scanning start signal is input, the counter 20 is reset as a reset signal, and every time a latch pulse LP is input, the clock is used as a clock. To When the vertical scanning start signal, which is a reset signal, is input, the counter 20 is reset, and the counting of the latch pulse LP is started.
  • the count 20 sequentially counts up each time a latch pulse LP is input. Then, when the count value of the latch pulse reaches 48, the output a of the first comparator 23 becomes “1”. Therefore, the output of the OR circuit 25 also becomes “1”. At this time, the “d” level output from the second comparator 24 is applied to the input terminal of the DFF 26, so the output d of the Q terminal of the DFF 26 becomes “0”, and the A pulse waveform as shown in Fig. 2 (B) is output from the / Q terminal of the breaker 27 as an enable signal / EN.
  • the counter 20 further counts the latch pulse LP, and when the count value reaches the decimal set value “64” of the luminance control end scanning line number input section 22, the second comparator 24 sets “1”. Is output.
  • the output “1” of the second comparator 24 is input to the D terminal of the DFF 26 and the OR circuit 25, and the OR circuit 25 outputs “1”.
  • the output d of the Q terminal of the DFF 26 becomes “1” and the one-shot multi-vibration 27 is reset, so the / Q terminal of the one-shot multi-vibration 27 is enabled as an enable signal / EN.
  • the control circuit of FIG. 2 (A) outputs the enable signal / EN of the pulse waveform while the display lines 48 to 64 shown in FIG. 2 (C) are being controlled. Output.
  • the enable signal EN when the enable signal EN is applied, the voltage applied to the scanning lines CI, C2,... ′ Is T during the “0” period as shown in (E) and (F). A short not only Ti T 2 than.
  • the enable signal EN is not input to the drive circuit of the data line dl shown in Fig. 3 (I), as shown in Fig. 3 (G), the waveform of "1" is only at the interval TO of the latch pulse LP. Is applied to the data line dl, the display of the organic EL element connected between the scanning line C1 and the data line dl is controlled only during the interval TO.
  • the enable signal EN when the enable signal EN is input to the drive circuit of the data line dl, as shown in FIG.
  • the voltage applied to the data line dl becomes “1” only during the time T1. And the period is T2 shorter than TO. Therefore, when the enable signal EN is input, the display of the organic EL element is controlled only during the time T1, and the operation time is shorter than that without the enable signal EN. In this way, by adjusting the enable signal EN, the light emission luminance of the organic EL element can be controlled. In other words, the luminance can be controlled by adjusting the CR time constant of one-shot multivibration.
  • the enable signal is not applied to the blue region, and the enable signal is input only to the green region.
  • the brightness of the green area can be adjusted, for example, the brightness of the blue area and the brightness of the green area can be made substantially the same.
  • an enable signal can be input to only one of the scan line and the data line drive circuit, and the applied waveform can be controlled.
  • This enable signal is As shown in Fig. 2 (A), it can be obtained not only by hardware logic but also by software in a microcomputer.
  • FIG. 4A shows an organic EL display device according to an embodiment of the present invention in which the organic EL display device 1 is controlled by a microcomputer 2, and the configuration is shown in FIG. 1 as a principle diagram. Since the display device is substantially the same as the display device, the corresponding portions are denoted by the same reference numerals as in FIG. 1, and detailed description is omitted. The only difference between the display device of FIG. 4 (A) and that of FIG. 1 is that the scanning side EN in FIG. 1 is omitted.
  • the organic EL display is a partial color display having a display size of 256 ⁇ 64 dots, for example, as shown in FIG. 4 (B), with a blue area of 256 ⁇ 48 dots and a green area of It can be 2 56 x 16 dots. This indicator is the same as that shown in Fig. 2 (C).
  • the micro-combination 2 outputs data and addresses to the display controller 3 and performs control such as storing data in the memory 14 and reading the stored data, and also outputs an enable signal EN. Output to the data-side drive circuits 7, 8, 9, and 10 to control the brightness of the green area.
  • the display controller 3 stores the data in the memory 14, reads the data, and stores the read data in the data-side drive circuits 7, 8, 9, 10, 10 according to the instruction from the microcomputer 2. To send to.
  • the memory 14 stores display data displayed on the organic EL display 1.
  • the scanning side driving circuit 5 acts to output a driving voltage to the scanning lines of the organic EL display 1, and the connecting means 6 connects the scanning side driving circuit 5 to the organic EL display 1.
  • the voltage output from the scanning drive circuit 5 is transmitted to the scanning lines of the organic EL display 1.
  • the data-side first drive circuit 7 transmits the data transmitted from the display controller 3 to the data line of the organic EL display 1 and outputs the data to this data line.
  • the input voltage is controlled as shown in Fig. 3 based on the enable signal EN.
  • the first drive circuit 7 on the data side is composed of, for example, a binary drive circuit shown in FIG.
  • This binary drive circuit includes a bidirectional shift register 30, a latch circuit 31, and a data control 34 connected in the same manner as in the multilevel drive circuit shown in FIG.
  • the output of the latch circuit 31 is directly connected to one input of the AND circuit 32.
  • the enable signal EN is connected to the other input of the AND circuit 32, and the output of the AND circuit 32 is input to the organic EL driver 33. .
  • the voltage control 35 is connected to the organic EL dryno '33.
  • the 8-bit parallel data D0 to D7 transmitted from the display controller 3 are converted to serial data by the data control 34 and transmitted to the bidirectional shift register 30.
  • this data is held in the bidirectional shift register 30 for 64 bits of data
  • the data is held in the latch 31 by the latch pulse LP, and the output of the latch 31 and the EN terminal It is transmitted to the organic EL driver 33 by taking the AND of the output.
  • the organic EL driver 33 is applied with a waveform corresponding to T 1 shown in FIG. 3 in which the portion where the data “1” is present is narrowed by the width of the enable signal EN.
  • the voltage transmitted from the voltage control 36 is converted into a pulse corresponding to this waveform T 1, sent to the first connection means 11 on the data side, and applied to the data line of the organic EL display 1. Is done. In this way, as shown in FIG. 3 (H), a voltage having a width T 1 adjusted by the enable signal EN is applied to the data line where the data “1” is present. You.
  • the data-side second drive circuit 8, the data-side third drive circuit 9, and the data-side fourth drive circuit 10 are configured similarly to the data-side first drive circuit 7.
  • the data-side second connection means 12, the data-side third connection means 13, and the data-side fourth connection means 14 are configured in the same manner as the data-side first connection means 11.
  • Clock Oscillator 15 The clock oscillator 16 acts to generate a clock signal for driving and controlling the display 2, and the clock oscillator 16 acts to generate a clock signal for driving and controlling the display controller 3.
  • the operation of the organic EL display device shown in FIG. 4 (A) will be described as a case where the organic EL display device 1 controls the partial color display device shown in FIG. 4 (B).
  • the scan line numbers 1 to 48 are blue areas
  • the scan line numbers are 49 to green areas
  • the green areas are The scan line number ends with 64.
  • the number of scanning lines in the green area is 16.
  • step (S 1) the microcomputer 2 is initialized, and in step (S 2), the microcomputer 2 counts the latch pulse LP reset.
  • step (S3) the micro computer 2 counts each of the latch pulses LP input to the micro computer 2 at a time.
  • step (S4) the microcomputer 2 compares the count number of the latch pulse with the number corresponding to the scanning line number through the predetermined brightness control. In this example, this number is set to 48. Until the number of latch pulse counts reaches 47, the count does not reach the predetermined number corresponding to the brightness control start scanning line number, so control proceeds to step (S 9), and control proceeds from step (S 9) to step (S 3). And repeat the same steps to count latch pulses.
  • step (S 4) If it is determined in step (S 4) that the count number of the latch pulse is 48, the microcomputer 2 proceeds to step (S 5) and outputs the enable signal / EN to all data terminals. Output to the drive circuit. As a result, the width of the voltage waveform of the rectangular wave output to the data line is shortened in the data driving first driving circuit 7 to the data driving fourth driving circuit 9 and the luminance control in the green region is performed. Done. Then, Micro Computer Yu 2 In step (S6), counting of the latch pulse LP after outputting the enable signal / EN is started. Next, in step (S7), it is determined whether a vertical scanning start signal has been issued.
  • step (S8) is executed, and the number of latch pulses in step (S6) is compared with the number corresponding to the predetermined luminance control end scanning line number. In the case of this example, this number is 16. If it is determined in step (S8) that the count number of the latch pulse does not reach the predetermined number, the control returns to step (S5). Therefore, the output of the enable signal / EN to the data side and the input of the latch pulse LP are repeated.
  • a vertical scan start signal is applied to the microcomputer 2 You. This vertical scanning start signal is detected in either step (S9) or step (S7). Then, the control returns to step (S2) to reset the count that counts the latch pulse LP. Thereafter, the same control is repeated.
  • the above description is an example of the case where the display has two colors, but the brightness is similarly adjusted by the microcomputer even when the display has three colors as shown in Fig. 4 (C). be able to.
  • the display shown in Fig. 4 (C) has a display area of 256 x 64 dots, and it has blue (256 x 32 dots), green (256 x 16 dots), and yellow (256 x 16 dots) in the scanning line direction.
  • This is a partial color display in which light emission colors are divided into three colors.
  • the current organic EL display has higher luminance in yellow than in green, so in this yellow area, control is performed so that the width of the enable signal is further increased and the luminance is reduced. do it.
  • the brightness is adjusted by applying an enable signal EN to all data-side drive circuits and controlling the enable signal EN in the control circuit using a microcomputer shown in Fig. 4 (A). It can be carried out.
  • FIG. 7 shows a second embodiment of the present invention.
  • the organic EL display 1 has a total display area of 256 ⁇ 64 dots, a blue area of 192 ⁇ 64 dots, and a green area in the data line direction, as shown in FIG. 7 (B).
  • the configuration is 64 x 64 dots.
  • the control circuit using microcomputer 1 shown in Fig. 7 (A) is almost the same as the control circuit shown in Fig. 4 (A), but only the fourth drive circuit 10 on the data side is enabled.
  • the signal EN is applied.
  • FIG. 8 shows a third embodiment of the present invention.
  • the organic EL display 1 has a green light emitting portion of 64 ⁇ 32 dots in one part of a blue light emitting display having a display area of 256 ⁇ 64 dots.
  • the control circuit may be the one shown in FIG. 7A, and the brightness is adjusted by controlling the enable signal EN applied to the data-side fourth drive circuit 10.
  • the organic EL display 1 has a total display area of 256 ⁇ 64 dots, a blue light emitting portion of 192 ⁇ 48 dots, and a 64 ⁇ 48 dot.
  • the light-emitting part is divided into three parts: a green light-emitting part of the dot and a yellow light-emitting part of 256 x 16 dots.
  • the configuration of the control circuit is almost the same as the circuit shown in Fig. 4 (A), as shown in Fig. 9 (A), except that the enable signal EN1 is applied to the data side drive circuits 7, 8, 9
  • the enable signal EN 2 different from the enable signal EN 1 is applied to the data drive circuit 10.
  • FIG. 10 shows a fifth embodiment of the present invention.
  • the display 1 has the same configuration as that shown in FIG.
  • the control circuit shown in Fig. 10 Although the circuit is basically the same as that shown in Fig. 7, the enable signal EN is applied only to the scanning side drive circuit, and the brightness is adjusted by controlling the enable signal EN.
  • the brightness adjustment in the partial color display having the configuration shown in FIG. 4C can be performed by controlling the enable signal EN applied to the scanning side drive circuit. In this case, it is necessary to change the width of the enable signal EN corresponding to the green and yellow areas according to the control amount.
  • FIG. 4B A sixth embodiment of the present invention will be described with reference to FIGS.
  • the brightness adjustment of the partial color display having the configuration shown in FIG. 4B is executed using the control circuit shown in FIG.
  • an EN signal having a configuration similar to that shown in FIG. 2 (A) is provided in order to supply a controlled enable signal EN to all of the overnight drive circuits 7, 8, 9, and 10.
  • An output control circuit 41 is provided.
  • 48 is set as the brightness control start scanning line number in the input section 21 and the input section 22 is set in the input section 22 to adjust the brightness of the display shown in FIG. 4 (B).
  • 48 + 162-64 is set as the luminance control end scanning line number.
  • the operation of the control circuit 41 is the same as that of the EN output control circuit shown in FIG. 2A, and a detailed description of the operation will be omitted.
  • the vertical scanning start signal is input, the counter 20 is reset and the counting of the latch pulse LP is started. Then, when the count 20 counts the latch pulse LP to 48, the match signal “1” is output from the first comparator 48, and thereafter, from the / Q terminal of the one-shot multivibrator 27, R, An enable signal / EN with a width based on the time constant of C is output, and this enable signal / EN is input to all of the data side drive circuits 7, 8, 9, and 10, and applied to the data line The voltage pulse width is adjusted, and luminance control for green is performed.
  • the brightness control start scanning line number input section 21 and the brightness control end scanning line number input section 22 may be of a type in which a predetermined number is set by a switching switch as shown in FIG. As shown, a method of setting with a resistor may be used.
  • a seventh embodiment of the present invention will be described with reference to FIG.
  • the ⁇ output control circuit 41 of the organic EL display device shown in FIG. 11 the luminance control end scanning line number input section 22 and the second comparator 24 from the circuit shown in FIG. Use the circuit with the configuration from which was deleted.
  • the first vertical scanning start signal is generated. If this vertical scanning start signal is used as a luminance control end signal, the luminance control end scanning line number input section 22 and the second comparator 24 become unnecessary.
  • a vertical scanning start signal is input to the OR circuit 25 and the D terminal of the DFF 26.
  • FIG. 11 An example in which the luminance adjustment of the display having the configuration shown in FIG. 4C is performed using the circuit shown in FIG. 11 will be described as an eighth embodiment of the present invention with reference to FIG. I do.
  • the output control circuit 41 in the circuit shown in FIG. 11 is configured as shown in FIG. 15, and the controlled enable signal is applied to all the data side drive circuits. You.
  • the output control circuit 41 shown in FIG. 15 includes a counter 20 configured similarly to the counter in the circuit shown in FIG. Two comparisons in the circuit of Fig. 2 (A) Instead of the units 23 and 24, three comparators, namely the first comparator 45 and the second comparator
  • luminance control in the green region is defined as luminance control first
  • luminance control in the yellow region is defined as luminance control second.
  • the first comparator 45 has a brightness control first start scan line number input section 42
  • the second comparator 46 has a brightness control first end second start scan line number input section 43
  • the brightness control second end scanning line number input section 44 is input to the comparator 47.
  • the outputs of the first comparator 45 and the second comparator 46 are input to the first OR circuit 48, and the outputs of the second comparator 46 and the third comparator 47 are input to the second OR circuit 49. Is done.
  • the output of the OR circuit 48 is connected to the input of the first DFF 50
  • the output of the second OR circuit 49 is connected to the input of the second DFF 51. 1st D F F
  • the output of the second comparator 46 is connected to the D terminal of 50, and the output of the third comparator 47 is connected to the D terminal of the second DFF 51.
  • One-shot multi-vibrations 52, 53 are provided to receive the output from the Q terminals of DFF 50, 51.
  • the configuration of these one-shot multivibrations 52 and 53 is the same as that of the one-shot multivibration 27 in the circuit shown in FIG. 2 (A).
  • the output of the one-shot multivibrator 52, 53 is input to the AND circuit 54.
  • a predetermined number 32 is set in the brightness control first start scanning line number input section 42
  • a predetermined number 4 is set in the brightness control first end second start scanning line number input section 43.
  • a predetermined number 64 is set in the brightness control second end scanning line number input section 44.
  • the counter 20 counts the latch pulse LP to 31, the comparators 45, 46, and 47 all output "0", so one-shot multi-vibration 1 52, 5 3 Output of each Q terminal becomes “1”. Therefore, the AND circuit 54 continuously outputs "1" as the enable signal / EN.
  • the one-shot multivibrator 53 outputs the same ⁇ 1 '' from the / Q terminal as before. From the shot multivibrator 52, a signal with a pulse width based on the time constant R 1 ⁇ C 1 is output.
  • the output from the AND circuit 54 changes according to a signal based on the output of the one-shot multivibrator 52. Therefore, the luminance of green can be adjusted by using the output of the AND circuit 54 as the enable signal / EN.
  • the count value of the latch pulse LP in the power supply 20 is between 48 and 64, one shot is output from the multivibrator 52 / Q terminal, and the one-shot multivibrator is output.
  • a signal with a pulse width based on the time constant R 2 ⁇ C 2 is output.
  • the output from the AND circuit 54 changes according to a signal based on the output of the one-shot multivibrator 53. Therefore, by using the output of the AND circuit 54 as the enable signal / EN, the luminance of yellow can be adjusted.
  • Embodiment IX An example in which luminance is adjusted in the display having the configuration shown in FIG. 7B will be described below as Embodiment IX with reference to FIGS. 16A and 16B.
  • the EN output control circuit 41 includes a one-shot multivibrator 27 receiving the latch pulse LP at the B terminal.
  • the C x terminal of one-shot multi by playing evening 2 7 and R x / C x terminal, R-C circuit having a variable resistor R and capacitor C are connected.
  • R-C circuit having a variable resistor R and capacitor C are connected.
  • each time the latch pulse LP is applied a signal of a pulse width based on the time constant determined by R ⁇ C is output from the / Q terminal of the one-shot multivibrator 27 to the rice- This signal is output as the ENABLE signal / EN and controls the fourth drive circuit 10 on the data side based on this.
  • the EN output control circuit 41 of the display device has a configuration shown in FIG.
  • the enable signal EN is applied only to the fourth drive circuit 10 on the data side.
  • 32 is set as a predetermined number. Until the count value of latch pulse LP in counter 20 reaches 31
  • Comparator 23 outputs “0”, and one-shot 'multivibration 27' / Q terminal outputs '1' continuously. However, when the count value of the latch pulse LP at the count 20 reaches 32, “1” is output from the first comparator 23 and the one-shot multivibrator 27 has the R / C The pulse signal with the pulse width determined by the time constant is output as the enable signal ZEN.
  • the data-side fourth drive circuit 10 shown in (A) is controlled based on this signal. This controls the green luminance in the display of FIG.
  • the vertical scan start signal is input to the count 20 and the count 20 is reset. Since this vertical scanning start signal is input to the OR circuit 25 and the D terminal of the DFF, the one-shot multi-vibration device 27 is reset, and the / Q terminal of the one-shot multi-vibration device 27 1 "is output continuously. In this way, the brightness of the green area of the display is controlled.
  • the EN output control circuit 41 forms two different enable signals EN 1 and EN 2.
  • the enable signal EN 2 is applied to the fourth drive circuit 10 on the data side to control the luminance of the green light emitting section, and the first drive circuit on the data side is controlled to control the luminance of the yellow light emitting section.
  • the enable signal EN1 is applied to the path 7, the second drive circuit 8 on the data side, and the third drive circuit 9 on the data side. In controlling the luminance of the yellow light emitting section, as described later, The enable signal EN1 may be made equal to the enable signal EN2. Referring to FIG.
  • the EN output control circuit 41 of FIG. 18 has two one-shots “multi-vibration” 52 and 53 instead of the one-shot “multi-vibration” 27 in the circuit shown in FIG. 2 (A).
  • the one-shot multi-vibrator 52 is connected in the same manner as the one-shot multi-vibrator 27 in the circuit shown in FIG.
  • the reset terminal is connected to the Q output of DFF 26 via an inverter 55.
  • 48 is set as a predetermined number in the brightness control start scan line number input section 21 of the EN output control circuit 41, and 64 is set as the predetermined number in the brightness control end scan line number input section 22.
  • both the first comparator 23 and the second comparator 24 output “0”, but the inverter 55 also outputs “0”.
  • the one-shot / multivibrator 53 / Q terminal outputs a signal having a pulse width determined by the time constant R2 ⁇ C2 to the AND circuit 54.
  • the / Q terminal of the one-shot multivibrator 52 continuously outputs "1", so the AND circuit 54 outputs the enable signal ZE N 2 based on the pulse width determined by the time constant R2 'C2. Then, it is input as a control signal to the fourth drive circuit 10 on the overnight side to control the luminance of the green light emitting section.
  • the enable signal EN2 applied to the data-side fourth drive circuit 10 is equal to the enable signal EN1.
  • the luminance of the yellow light emitting unit is controlled by the same enable signal E1.
  • the data-side first drive circuit 7, the data-side second drive circuit 8, the data-side third drive circuit 9, and the data-side fourth drive circuit 10 are independently controlled, Since the yellow light emitting part can be controlled by enable signals EN 1 and EN 2 of the same size, even in the case of the partial color display shown in Fig. 9 (B), the brightness of each color is adjusted by the control amount corresponding to each. can do.
  • the organic EL display device in this example includes an EN output control circuit 60 that supplies an enable signal EN to the scanning side drive circuit 5, as shown in FIG.
  • This EN output control circuit 60 may have the same configuration as the circuit shown in FIG. In this case as well, a predetermined number of 48 is set in the brightness control start scan line number input section 21 of the EN output control circuit 60, and a predetermined number is set in the brightness control end scan line number input section 22. Is set to 64. Until the count of the latch pulse LP at the count 20 reaches 47, the first comparator 23 outputs “0”. Is output continuously. Therefore, the brightness of the blue light emitting portion is not adjusted.
  • FIG. 14 is used as the EN output control circuit 60 in FIG. 19 instead of the circuit shown in FIG.
  • This EN output control circuit has a configuration in which the brightness control termination search line number input section 22 and the corresponding comparator 24 are omitted, and as described above with reference to FIG. Is input to the OR circuit 25 and the D terminal of the DFF 26 to terminate the brightness adjustment control.
  • the one-shot multivibrator 53 While the count number of latch pulse LP at count 20 is between 32 and 47, the one-shot multivibrator 53 outputs the same 1 from the / Q terminal as before, Since a signal having a pulse width based on the time constant R 1 ⁇ C 1 is output from the shot multivibrator 52, a signal based on the output of the one-shot multivibrator 52 is output from the AND circuit 54. Output as enable signal / EN. Therefore, the brightness of green can be adjusted.
  • FIG. 20 shows a display device to be controlled in this embodiment.
  • the display has a total display area of 256 x 64 dots, and is a multicolor color display in which blue light emission scan lines and red light emission scan lines of minute width are alternately arranged in the scan line direction. It is configured as a display.
  • the control circuit of the organic EL display device can have the configuration shown in Fig. 4 (A).
  • FIG. 21 is a flowchart showing control for adjusting the brightness or the display emission color in the organic EL display device.
  • step (S10) the microcomputer 2 is initialized, and in a step (SI1), a count for counting the launch pulse LP is reset.
  • step (S12) it is determined whether or not the latch pulse LP has been detected. This control is the part corresponding to the blue scan line, and this step is repeated until the latch pulse LP is detected. It is.
  • step (SI2) control not to output the enable signal EN is performed at this stage. Therefore, no brightness adjustment is performed on the blue scan line.
  • step (S13) the control by the microcomputer 2 proceeds to step (S13), and it is determined whether or not the next latch pulse LP has been detected. If the latch pulse LP is not detected, the step (S13) is repeated. This control is a portion corresponding to the red scanning line.
  • step (S13) control for outputting the enable signal EN is performed. Therefore, the brightness adjustment is performed on the red scan line.
  • step (S14) it is determined whether or not a vertical scanning start signal has been detected. As long as the vertical scanning start signal is not detected, the control returns to step (S12), and the steps after step (S12) are repeated.
  • step (S14) the control returns to step (S11). Here, the count is reset and the same control is repeated. In this manner, the luminance adjustment of the even-numbered red light emission scanning line portion is performed by the enable signal EN until the vertical scanning start signal is detected.
  • FIG. 22 shows another example of a display to be controlled by the brightness adjustment according to the present invention.
  • the display has a total display area of 256 ⁇ 66 dots, and is a multicolor color display in which blue, red, and yellow emission scanning lines are alternately arranged in the scanning line direction.
  • FIG. 23 is a flowchart showing the control for adjusting the luminance of the display device and adjusting the display emission color in this case.
  • step (S15) the microcomputer 2 is initialized, and then, in step (S16), the latch pulse LP is counted. Is reset. So Thereafter, in step (S17), it is determined whether or not the latch pulse LP has been detected. When the latch pulse LP is not detected, the step (S17) is repeated. This step (S17) corresponds to the blue scanning line of the display. When the latch pulse LP is detected in step (S17), the control of the enable signal EN non-output is performed. Therefore, the enable signal EN is not output to the blue scanning line. Therefore, the brightness adjustment based on the enable signal EN is not performed on the blue light emission scanning line portion located on the first scanning line portion.
  • step (S18) it is determined whether or not the latch pulse LP has been detected. When the latch pulse LP is not detected, the step (S18) is repeated. This step (S18) corresponds to the red scanning line of the display.
  • the microcomputer 2 outputs the first enable signal ⁇ ⁇ 1 having a pulse width for red adjustment, and the first drive on the data side. This is applied to the circuit 7, the data-side second drive circuit 8, the data-side third drive circuit 9, and the data-side fourth drive circuit 10. As a result, the luminance adjustment based on the first enable signal ⁇ 1 is performed on the red light emission scanning line portion.
  • step (S19) it is determined whether the latch pulse LP has been detected. If not, step (S19) is repeated. This step (S19) corresponds to the yellow scanning line of the display.
  • the micro combination 2 outputs a second enable signal EN2 having a pulse width for yellow adjustment, and the data-side first drive circuit 7, This is applied to the data-side second drive circuit 8, the data-side third drive circuit 9, and the data-side fourth drive circuit 10. As a result, brightness adjustment based on the second enable signal EN2 is performed on the yellow emission scanning line portion.
  • step (S20) it is determined whether or not a vertical scanning start signal has been detected.
  • step (S20) control returns to step (S17), and the same steps are repeated.
  • the control returns to step (S16), and the count is reset.
  • the brightness adjustment based on the first enable signal EN 1 is not performed on the red emission scanning line portion until the vertical scanning start signal is performed, and the brightness adjustment based on the first enable signal EN 1 is not performed on the blue emission scanning line portion.
  • the brightness adjustment based on the second enable signal EN2 is performed on the yellow light emission scanning line portion in order.
  • the microcomputer 2 detects the vertical scanning start signal
  • the control returns to the step (S16), the LP counter for counting the latch pulse is reset, and the above-described control is performed again. Repeated.
  • FIG. 24 (B) shows the display 1 to be controlled in this embodiment.
  • This display 1 is configured as a multicolor color display with a display area of the entire display area of 256 x 64 dots and blue light emission data lines and red light emission data lines arranged alternately in the data line direction. Is done.
  • the control circuit of the organic EL display device has the overall configuration shown in FIG. 24A, and the first drive circuit 65 and the second drive circuit 66 are connected to the display 1
  • the blue light emitting data line is connected to the blue light emitting data line such that the blue light emitting data line is shared by half.
  • the data side third drive circuit 67 and the data side fourth drive circuit 68 are connected to the red data line so as to share the red data line in half.
  • the enable signal EN from the microcomputer 2 is applied to the data-side third drive circuit 67 and the data-side fourth drive circuit 68.
  • the data-side first drive circuit 65 and the data-side second drive circuit 66 each drive-control the blue light-emitting data line.
  • the data-side third drive circuit 67 and the data-side fourth drive circuit 68 drive and control the red light-emitting data line, respectively.
  • the brightness adjustment based on the enable signal EN is not performed on the blue light emitting data line side, and the brightness adjustment based on the enable signal EN is performed only on the red light emitting data line side.
  • the enable signal EN is applied to the third drive circuit 67 on the data side and the fourth drive circuit 68 on the data side.
  • the brightness can be adjusted by independently controlling the blue light emitting side and the red light emitting side.
  • FIGS. 25 (A) and 25 (B) Still another embodiment of the present invention is shown in FIGS. 25 (A) and 25 (B).
  • the display device to be controlled in this embodiment has an entire display area of 256 ⁇ 64 dots and an area of 256 ⁇ 48 dots.
  • the blue light emission data line and the red light emission line are arranged alternately in the direction of the data line, and the green light emitting part is located in the area of 25 6 ⁇ 16 dots shown in the lower part of Fig. 25 (B). Is formed.
  • the microcomputer 2 supplies the enable signal EN1 to the first drive circuit 65 on the data side and the second drive circuit 66 on the data side, and the third drive circuit on the data side.
  • the enable signal EN 2 is supplied to the drive circuit 67 and the fourth drive circuit 68 on the evening side.
  • the microcomputer 2 When the scanning line is between 1 and 48, the microcomputer 2 enables the data-side first drive circuit 65 and the data-side second drive circuit 66 that drive the blue light-emitting display line. Outputs signal EN1 and slightly controls brightness for blue emission. Then, an enable signal EN2 different from the enable signal EN1 is output to the data side third drive circuit 67 and the data side fourth drive circuit 68 driving the red light emitting data line. Then, the red is adjusted so that the luminance becomes the same as the blue whose luminance is adjusted by the rice pull signal EN1.
  • the microcomputer 2 supplies the enable signals EN 1 and EN 2 of the same magnitude to the respective data-side drive circuits, and The evening drive circuits 65, 66, 67, 68 are controlled by enable signals of the same magnitude.
  • the enable signals EN 1 and EN supplied at this time are different in magnitude from the enable signals EN 1 and EN 2 applied when the scanning line is between 1 and 48. This makes it possible to adjust the emission luminance of green to be the same as that of blue and red. .
  • the enable signal EN1 is not output, that is, the brightness control for the blue light-emitting portion is not performed, and the red light-emitting portion is enabled only by the enable signal EN2. Can be performed only for the brightness control.
  • the enable signals EN 1 and EN 2 of the same magnitude may be output to control the luminance for the green light emitting portion. .
  • the configuration of the control circuit of the display device can be the same as that shown in FIG.
  • the enable signal EN is not output to the scan line due to the control of the blue light emission scan line, and when the count value is an even number, the enable signal EN is output. Outputs the pull signal EN to control the red emission scan line. In this way, the luminance of red can be adjusted for each scanning line.
  • brightness adjustment in a three-color color display as shown in Fig. 22 is also performed by outputting an enable signal corresponding to the brightness adjustment amount from each micro-computer for each scanning line. It can be done easily.
  • the configuration of the control circuit of the display device can be the same as that shown in FIG. This control circuit is used for all It is configured to control the enable signal EN.
  • the EN output control circuit 41 has the configuration shown in FIG.
  • the EN output control circuit 41 has a counter 20 in which a latch pulse LP is input as a clock signal and a vertical scanning start signal is input to a reset terminal, and the Q0 output of the counter 20 is one. Connected to the reset terminal of the shot multivibrator 27.
  • One-shot multi-vibration — Even 27 is configured to receive a latch pulse LP as a clock signal at the B terminal, and connected to the RC circuit as in the EN output control circuit 41 described above. Have been. One-shot multivibrator 27 outputs enable signal / EN from its / Q terminal.
  • the count 20 counts the latch pulse LP.
  • ⁇ 1 '' is output to the Q 0 pin of the count 20 and when the count of the even-numbered latch pulse, the count 0 of the count 0 "0" is output to Therefore, when the count 20 counts the even-numbered latch pulse, the output of the / Q terminal of the one-shot multi-bi-player 27 outputs the enable signal / EN of the pulse width based on the RC time constant. I do. This is input to the data-side first drive circuit 7, the data-side second drive circuit 8, the data-side third drive circuit 9, and the data-side fourth drive circuit 10 as an enable signal EN.
  • the brightness of the red light is adjusted based on the enable signal.
  • the red emission luminance can be adjusted.
  • the luminance signal can be adjusted for the odd-numbered scanning lines by similarly controlling the enable signal.
  • the control circuit 41 includes DFF 1 and DFF 2 connected to receive a latch pulse LP and a vertical scanning start signal, and two AND circuits 72 and 73.
  • the / Q outputs of DFF 1 and DFF 2 are connected to two inputs of the AND circuit 72, respectively, and the output of the AND circuit 72 is connected to the D terminal of DFF 1.
  • the two inputs of the AND circuit 73 are connected to the Q output of DFF1 and the / Q output of DFF2.
  • the output of the AND circuit 73 is connected to the D terminal of DFF2.
  • the Q output of DFF 1 is connected to the reset terminal of one-shot and multivibrator 74, and the Q output of DFF 2 is connected to the reset terminal of one-shot and multivibrator 75.
  • DFF 1 and DFF 2 and AND circuits 72 and 73 constitute a known ternary counter.
  • the / Q terminals of the one-shot multivibrator 74 and 75 both output "1", and the AND circuit 76 outputs "1" continuously as the enable signal / EN. Since the value is output, no enable signal is output to the drive circuits 7, 8, 9, and 10 on the overnight side. Therefore, the brightness control by the enable signal is not performed on the blue light emission scanning line in the display.
  • the / Q terminal of the one-shot multivibrator 74 outputs an enable signal having a pulse width corresponding to the time constant of C1 and R1.
  • the one-shot multivibrator 75's / Q terminal outputs “1” continuously, so the AND circuit 76 uses this one-shot multivibrator 74
  • An output signal with a pulse width corresponding to the time constant of Rl ⁇ C1 from the / Q terminal is output as the enable signal / EN.
  • This signal is applied to each of the overnight drive circuits 7, 8, 9, and 10 as an enable signal EN, so that the luminance adjustment based on the enable signal EN is performed in the red light emission scanning line.
  • the / Q terminal of the one-shot 'multi-vibration unit 74' continuously outputs' 1 ', and the one-shot' multi-vibration unit 75 / Q
  • the terminal outputs an enable signal with a pulse width according to the time constant of R 2 ⁇ C 2. Therefore, this time, the AND circuit 76 outputs an output signal having a pulse width corresponding to the time constant of R 2 and C 2 from the terminal of the one-shot multivibrator 75 as an enable signal / EN.
  • This signal is applied to the data-side drive circuits 7, 8, 9, 10 as the enable signal EN, so that the yellow light emitting scanning lines are adjusted in brightness based on the enable signal EN.
  • the control circuit of the organic EL display device is almost the same as that shown in FIG. 24, but an EN output control circuit 41 is provided to generate the enable signal EN.
  • This EN output control circuit 41 may have the same configuration as the circuit shown in FIG. 16 (B).
  • the EN output control circuit 41 connects the data-side first drive circuit 65 and the data-side second drive circuit 66, and the data-side third drive circuit 67 and the data-side fourth drive circuit 68. The brightness is controlled separately and independently.
  • the data-side first drive circuit 65 and the data-side second drive circuit 66 control and drive the blue light-emitting data line, respectively.
  • the fourth driving circuit 68 controls the driving of the red light-emitting line.
  • the brightness adjustment based on the enable signal is not performed on the blue light emitting device side, and the brightness adjustment based on the enable signal EN is performed on the red light emitting device side. control
  • the operation of circuit 41 is similar to that described in connection with FIG.
  • the control circuit of the organic EL display device is almost the same as that shown in FIG. 25 (A), but an EN output control circuit 41 is provided to form the enable signal EN. .
  • This EN output control circuit 41 may have the same configuration as the circuit shown in FIG.
  • the data is supplied to the data-side first drive circuit 65 and the data-side second drive circuit 66, and the data-side third drive circuit 67 and the data-side fourth drive circuit 68.
  • the brightness is adjusted by independently controlling the enable signal EN.
  • a predetermined number of 48 is set in the brightness control start scan line number input section 21 of the EN output control circuit 41, and a predetermined number of 6 is set in the brightness control end scan line number input section 22. 4 is set.
  • the / Q terminal outputs to the AND circuit 54 a signal having a pulse width that becomes the enable signal / EN 2 determined by the time constant R 2 ⁇ C 2.
  • the AND circuit 54 enables the signal based on the pulse width determined by the time constant R 2 and C 2.
  • the signal / EN 2 is output, and is input to the third drive circuit 67 on the data side and the fourth drive circuit 68 on the data side to control the luminance of the red light emitting unit.
  • the enable signal / EN1 output from the / Q terminal of the one-shot multivibrator 52 is output as an enable signal / EN2 from the AND circuit 54, and the third drive on the data side is output.
  • the enable signal EN 2 shown in FIG. 37 (A) is applied to the circuit 67 and the fourth drive circuit 68 on the data side. That is, after the count value of the latch pulse LP becomes 48, the enable signal EN1 becomes equal to the enable signal EN2 for the green light emitting portion, and the one-shot multivibrator 5 The luminance is controlled by the enable signal of the same value output from 2.
  • FIG. 20 Still another embodiment for performing brightness control in a display having the configuration of FIG. 20 will be described below.
  • the configuration of the control circuit of the display device in this case is the same as that shown in FIG.
  • the EN output control circuit 60 has the configuration shown in FIG.
  • the counter 20 counts the latch pulse LP.
  • the count 20 counts the odd-numbered latch pulse
  • “1” is output to the Q 0 terminal of the count 20
  • when the even-numbered latch pulse is counted “0” is output to the Q 0 terminal.
  • the pulse width based on the time constant of R'C is output from the / Q terminal of the one-shot 'multi-bi-play timer 27'.
  • Output signal / EN This becomes the scan-side enable signal EN, which is input to the scan-side drive circuit 5, so that even-numbered red light-emitting scanning lines adjust the luminance of red light based on this.
  • the enable signal for the even-numbered scanning lines by controlling the enable signal for the even-numbered scanning lines, the light emission luminance can be adjusted.
  • the luminance of the odd-numbered scanning lines is adjusted by controlling the enable signal in the same way according to the color arrangement of the display. be able to.
  • the EN output control circuit 41 has the configuration shown in FIG.
  • the EN output control circuit when the first latch pulse LP is input, the one-shot, the / Q terminals of the multivibrators 74 and 75 both output “1”, and the AND circuit 76 outputs the enable signal. Since the continuous value of "1" is output as / EN, the enable signal EN is not applied to the scanning drive circuit 5. Therefore, enable control for the blue light emission scanning line is not performed.
  • the / Q terminal of the one-shot multi-vibrator 74 outputs an enable signal / pulse having a pulse width corresponding to the time constant of C 1 and R 1.
  • the output of EN and the one-shot 'multivibration 75 / Q terminal continuously outputs "1", so the AND circuit 76 is connected to this one-shot' multivibration 74 / Q terminal R 1 ⁇
  • the AND circuit 76 outputs an output signal having a pulse width corresponding to the time constant of R 2 and C 2 from the ZQ terminal of the one-shot-multivibrator 75 as an enable signal / EN.
  • This signal is the scanning side drive circuit Since the enable signal EN for 61 is applied as an enable signal, the enable control for the yellow light emission scanning line in FIG. 41 (B) is performed.
  • Such control is sequentially repeated according to the input of the latch pulse LP, and the red light emission luminance and the yellow light emission luminance are adjusted.
  • the display screen is not limited to the matrix display screen as described above.
  • a deformed segment such as a character, a character display section of 5 ⁇ 7 dots is used. It can also be used for a segmented partial color display composed of 3 x 2 red elongated element sections, 1 x 14 yellow elongated element sections, 4 16 blue elongated element sections, etc. it can.
  • scanning lines are divided for each color.
  • the driving means a microcomputer or a logic circuit may be used in the same manner as described above, and the control by the enable signal EN may be performed on the data side or the scanning side. it can.
  • the organic EL display 1 When the organic EL display 1 is enlarged, as shown in FIG. 31 (B), the display is composed of pixels 0, 1 and so on. Therefore, in a memory configuration with 1 bit, 1 pixel, or 2 gradations, as shown in Fig. 31 (C), the data in the memory and the light emission / non-light emission of the light emitting elements are in one-to-one correspondence. be able to.
  • 4-color / 4-gradation data is represented by 2 bits as shown in Fig. 31 (D).
  • the data of 16 color / 16 gray scale display is represented by 4 bits as shown in Fig. 43 (E).
  • Fig. 43 (E) can be stored per pixel.
  • FIG. In other words, in the case of a display of one dot and one pixel (two gradations), as shown in FIG.
  • the 1-bit pixel data is read from the evening memory, and the display data in the memory is output to the drive circuit as it is, for example, as 8-bit parallel display data output or 1-bit serial display data output.
  • 2-bit pixel data that is, gradation data is read from the display data memory as shown in FIG.
  • the gradation data is converted into a frame data, and the converted frame data is output to the drive circuit as, for example, 8-bit parallel display data output or 1-bit serial display data output. That is, in the case of 4-color / 4-gradation display, display data in the memory is converted into data for each frame and output to the drive circuit.
  • 4-bit pixel data that is, gradation data is read out from the display data memory, and The gradation data is converted into frame data, and the converted frame data is output to the drive circuit as, for example, 8-bit parallel display data output or 1-bit serial display data output. That is, in the case of 16-color / 16-gradation display, display data in the memory is converted into data for each frame and output to the drive circuit.
  • the data is stored in the memory in the memory, even if it is divided and stored for each color, and as shown in Fig. 33 (B).
  • the pixel arrangement of the multicolor color display may be stored in the memory as it is. If the data is stored separately for each color, the data may be read out one pixel at a time, as in the case of one color. If the pill cell arrangement of the multicolor color display is stored in the memory as it is, the data may be read out every other pixel.
  • the value of the resistor R in the time constant circuit of the one-shot multivibration can be variably controlled by using a variable resistor such as a trimmer resistor. It is also possible to use a number of series resistors, such as a potentiometer, and to programmably switch the switching terminal of each resistor. It can also be turned off. If a trimmer resistor is used, the resistance can be adjusted and controlled manually, and if a fixed resistor is used, the mounting area can be reduced. If a programmable adjustment resistor is used, the resistance value can be controlled as programmed in advance or by a data input means such as a keyboard. ,
  • the microcomputer was driven at 16 MHz with 16 bits to display 16 gradations.
  • the difference in luminance was less than 5% even when the light emitting color was different in each gradation. This is a range in which luminance unevenness does not matter visually.
  • the organic EL display is not limited to the matrix type display, but may be a matrix type display or a segment type display. In short, the present invention can be applied to any display device having a plurality of scanning lines and a plurality of data lines.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)
  • Control Of El Displays (AREA)

Abstract

L'invention se rapporte à un afficheur électroluminescent organique conçu pour émettre un certain nombre de couleurs sans inégalité de luminance grâce à un ajustement correcte des luminances des couleurs. Cet afficheur électroluminescent organique comporte une unité d'affichage (1) dotée d'éléments électroluminescents organiques disposés entre une pluralité de lignes de balayage et une pluralité de lignes de données. Ledit afficheur électroluminescent se caractérise en ce qu'il contient en outre des circuits d'attaque côté-données de sortie en valeurs binaires (7 à 10), conçus pour appliquer une tension à l'unité d'affichage (1) par l'intermédiaire d'électrodes de balayage, un circuit d'attaque côté-balayage (5), et un organe de commande (2) conçu pour commander le fonctionnement d'attaque d'un signal d'attaque appliqué à au moins l'un des circuits d'attaque côté-données (7 à 10), ainsi que le circuit d'attaque (5), et en ce que la luminance de l'unité d'affichage (1) est partiellement ajustée.
PCT/JP2000/000680 1999-03-15 2000-02-08 Afficheur electroluminescent organique WO2000055836A1 (fr)

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JP6812399 1999-03-15
JP11/68123 1999-03-15

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WO2000055836A1 true WO2000055836A1 (fr) 2000-09-21

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006023585A (ja) * 2004-07-08 2006-01-26 Rohm Co Ltd 表示装置の駆動方法およびそれを利用した表示装置
JP2006053242A (ja) * 2004-08-10 2006-02-23 Rohm Co Ltd 表示装置の駆動方法、駆動装置およびそれを利用した表示装置

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5891497A (ja) * 1981-11-27 1983-05-31 オリンパス光学工業株式会社 表示駆動装置
JPS61143794A (ja) * 1984-12-17 1986-07-01 スタンレー電気株式会社 発光ダイオ−ド表示装置
JPS63104095A (ja) * 1986-10-22 1988-05-09 スタンレー電気株式会社 発光ダイオ−ド表示装置
JPH01307796A (ja) * 1988-06-06 1989-12-12 Yokogawa Electric Corp Ｌｅｄ表示装置
JPH0415685A (ja) * 1990-05-09 1992-01-21 Mitsubishi Electric Corp 発光ダイオード表示装置
JPH0830230A (ja) * 1994-07-13 1996-02-02 Sanyo Electric Co Ltd 表示装置
EP0766221A1 (fr) * 1995-09-29 1997-04-02 Pioneer Electronic Corporation Circuit d'attaque pour un élément émetteur de lumière utilisant un circuit à capacités commutées

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5891497A (ja) * 1981-11-27 1983-05-31 オリンパス光学工業株式会社 表示駆動装置
JPS61143794A (ja) * 1984-12-17 1986-07-01 スタンレー電気株式会社 発光ダイオ−ド表示装置
JPS63104095A (ja) * 1986-10-22 1988-05-09 スタンレー電気株式会社 発光ダイオ−ド表示装置
JPH01307796A (ja) * 1988-06-06 1989-12-12 Yokogawa Electric Corp Ｌｅｄ表示装置
JPH0415685A (ja) * 1990-05-09 1992-01-21 Mitsubishi Electric Corp 発光ダイオード表示装置
JPH0830230A (ja) * 1994-07-13 1996-02-02 Sanyo Electric Co Ltd 表示装置
EP0766221A1 (fr) * 1995-09-29 1997-04-02 Pioneer Electronic Corporation Circuit d'attaque pour un élément émetteur de lumière utilisant un circuit à capacités commutées

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006023585A (ja) * 2004-07-08 2006-01-26 Rohm Co Ltd 表示装置の駆動方法およびそれを利用した表示装置
JP2006053242A (ja) * 2004-08-10 2006-02-23 Rohm Co Ltd 表示装置の駆動方法、駆動装置およびそれを利用した表示装置

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