US20040149886A1 - Electro-optical device, matrix substrate, and electronic equipment - Google Patents

Electro-optical device, matrix substrate, and electronic equipment Download PDF

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Publication number
US20040149886A1
US20040149886A1 US10/636,569 US63656903A US2004149886A1 US 20040149886 A1 US20040149886 A1 US 20040149886A1 US 63656903 A US63656903 A US 63656903A US 2004149886 A1 US2004149886 A1 US 2004149886A1
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Prior art keywords
power
supply lines
electro
supply
optical device
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US10/636,569
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English (en)
Inventor
Yojiro Matsueda
Hayato Nakanishi
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Seiko Epson Corp
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Seiko Epson Corp
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Assigned to SEIKO EPSON CORPORATION reassignment SEIKO EPSON CORPORATION ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: NAKANISHI, HAYATO, MATSUEDA, YOJIRO
Publication of US20040149886A1 publication Critical patent/US20040149886A1/en
Priority to US12/461,072 priority Critical patent/US8654040B2/en
Abandoned legal-status Critical Current

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    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
    • H10K59/10—OLED displays
    • H10K59/12—Active-matrix OLED [AMOLED] displays
    • H10K59/131—Interconnections, e.g. wiring lines or terminals
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B33/00—Electroluminescent light sources
    • H05B33/12—Light sources with substantially two-dimensional radiating surfaces
    • H05B33/26—Light sources with substantially two-dimensional radiating surfaces characterised by the composition or arrangement of the conductive material used as an electrode
    • 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
    • G09G3/3233—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 with pixel circuitry controlling the current through the light-emitting element
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2300/00—Aspects of the constitution of display devices
    • G09G2300/04—Structural and physical details of display devices
    • G09G2300/0421—Structural details of the set of electrodes
    • G09G2300/0426—Layout of electrodes and connections
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2300/00—Aspects of the constitution of display devices
    • G09G2300/08—Active matrix structure, i.e. with use of active elements, inclusive of non-linear two terminal elements, in the pixels together with light emitting or modulating elements
    • G09G2300/0809—Several active elements per pixel in active matrix panels
    • G09G2300/0842—Several active elements per pixel in active matrix panels forming a memory circuit, e.g. a dynamic memory with one capacitor
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2310/00—Command of the display device
    • G09G2310/02—Addressing, scanning or driving the display screen or processing steps related thereto
    • G09G2310/0202—Addressing of scan or signal lines
    • G09G2310/0221—Addressing of scan or signal lines with use of split matrices
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2310/00—Command of the display device
    • G09G2310/02—Addressing, scanning or driving the display screen or processing steps related thereto
    • G09G2310/0264—Details of driving circuits
    • G09G2310/0297—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
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
    • H10K59/30—Devices specially adapted for multicolour light emission
    • H10K59/35—Devices specially adapted for multicolour light emission comprising red-green-blue [RGB] subpixels

Definitions

  • the present invention relates to an arrangement of power-supply wiring of an electro-optical device suitable for a large display panel.
  • organic EL elements are electrically driven light-emitting elements, a backlight is not needed. Additional advantages are their low electrical power consumption, wide field of view, and high.contrast ratio.
  • Organic EL elements are used for small and medium size displays for devices such as cellular phones and personal digital assistants.
  • An organic EL element is an electro-optical element with a light-emitting layer including fluorescent material interposed between an anode and a cathode. Supplying a forward biased current between the two types of electrodes causes holes injected from the anode and electrons injected from the cathode to recombine. The recombination energy generated causes the organic EL element to emit light.
  • anode power-supply lines are wired in on a pixel area of the active matrix substrate where pixels are arranged in a matrix, while a cathode film, which is a common electrode, is disposed over the entire pixel area.
  • An improvement with an objective to lower the electrical power consumption and improve the light-emitting efficiency of a display apparatus by optimizing the wiring arrangement is known from, for instance, Japanese Unexamined Patent Application Publication No. 11-24606 (Patent Document 1).
  • An object of the present invention is to provide power-supply wiring technology suitable for large displays. Another object of the present invention is to provide techniques for mounting suitable driver circuits for large displays.
  • the electro-optical device has a pixel area consisting of electro-optical elements driven by electrical power received from power-supply circuits.
  • the electro-optical device comprises basic power-supply lines disposed on the upper portion of the substrate, which receive a power-supply voltage from the power-supply circuits, and main power-supply lines disposed on the upper portion of the substrate, which intersect and connect with the basic power-supply lines.
  • the power-supply voltage is supplied to the electro-optical elements via the main power-supply lines.
  • the main power-supply lines are arranged in a direction that intersects the basic power-supply lines in a strip pattern.
  • a desired amount of electrical power may be supplied to each electro-optical element.
  • the main power-supply lines are arranged in a direction that intersects substantially orthogonally the basic power-supply lines.
  • electrical power may efficiently be supplied to the electro-optical elements, which are arranged in two directions perpendicular to each other.
  • the line thickness of the main power-supply lines is smaller than the line thickness of the basic power-supply lines.
  • the resistance of the basic power-supply lines can be reduced.
  • the basic power-supply lines are arranged on the outside edges of the pixel area, and the main power-supply lines are arranged in a direction that intersects the basic power-supply lines.
  • the main power-supply lines may be formed from the basic power-supply lines to the entire pixel area.
  • the basic power-supply lines are arranged in linearly symmetrical pairs on the outside edges of the pixel area.
  • electrical power may be supplied to each electro-optical element disposed on the pixels area over a large area.
  • the main power-supply lines are arranged so that the arrangement pitch is substantially equal.
  • electrical power may be supplied to each electro-optical element in a well-balanced manner.
  • auxiliary power-supply lines that intersect the main power-supply lines are further provided.
  • the resistance of the entire power-supply wiring may be reduced.
  • the auxiliary power-supply lines are arranged in a direction that intersects the main power-supply lines in a strip pattern.
  • the resistance of the power-supply wiring may be reduced.
  • the auxiliary power-supply lines are arranged in a direction that substantially orthogonally intersects the main power-supply lines.
  • a desired amount of electrical power may be supplied to the electro-optical elements, which are arranged in two directions perpendicular to each other in a well-balanced manner.
  • the power-supply wiring is arranged so that the electro-optical elements are disposed on the pixel area and the pixel area is sectioned into a plurality of pixel groups each including at least one of the electro-optical elements, and the pixel groups receive power from different power-supply circuits.
  • the power-supply voltage may be corrected, and, as a result, any difference between power-supply circuits may be corrected.
  • the power-supply circuits are enclosed in tape carrier packages and are contained in driver IC chips bonded to the substrate.
  • Using external circuits as the power-supply circuits is suitable for a large display.
  • scanning lines for selecting a group of electro-optical elements lined up in one direction are arranged, and scanning line drivers for simultaneously driving at least two scanning lines are provided.
  • the driving frequency for the scanning line drivers may be reduced and this is suitable for a large display.
  • data lines for transmitting data signals which regulate the gradation of the light emitted from the electro-optical element, are further provided, and the data signals are supplied from the driver IC chips. Disposing data line drivers in the external circuits of the substrate is suitable for a large display.
  • analog switches for switching the output of the data signals supplied from the driver IC chips to the data lines are provided.
  • the analog switches for switching the data line output to the data lines the number of data lines supplied from the driver IC chips to the substrate may be reduced, and, as a result, this is suitable for simplifying the circuit board.
  • the electro-optical device has, on the substrate, electro-optical elements driven by electrical power supplied from power-supply circuits.
  • the electro-optical device has, on the edge of the substrate, external driver circuits for driving and controlling the electro-optical elements.
  • Each pixel group consisting of a plurality of electro-optical elements is driven and controlled by each driver circuit. Driving and controlling the pixels with the external driver circuits is suitable for a large display.
  • the driver circuits that are driver IC chips enclosed in tape carrier packages are provided.
  • the driver circuits may easily be mounted on the circuit board.
  • the driver IC chips that are the data line drivers are provided.
  • the electro-optical elements that are electroluminescent elements are provided.
  • electrically driven light-emitting elements that emit light may be provided.
  • the electronic apparatus has the above electro-optical device.
  • the electronic apparatus is not limited to a particular apparatus as long as it has a display device.
  • the electronic apparatus for instance, may be a cellular phone, a video camera, a personal computer, a head-mounted display, a projector, a facsimile machine, a digital camera, a portable television, a DSP device, a PDA, or an electronic databook.
  • the matrix substrate according to the present invention has a pixel area for disposing the electro-optical elements driven by power supplied from the power-supply circuits.
  • the matrix substrate has basic power-supply lines, which are disposed on the upper portion of the substrate and which receive a power-supply voltage output from the power-supply circuits, and main power-supply lines, which intersect and connect with the basic power-supply lines and are disposed on the upper portion of the substrate.
  • the main power-supply lines supply the power-supply voltage to the electro-optical elements.
  • the matrix substrate will provide a display without unevenness.
  • the term ‘matrix substrate’ refers to a wiring board on which electro-optical elements are not yet mounted.
  • the main power-supply lines are arranged in a strip pattern in a direction that intersects the basic power-supply lines.
  • a desired amount of electrical power may be supplied to each electro-optical element.
  • the main power-supply lines are arranged in a direction that is substantially orthogonal to the basic power-supply lines.
  • electrical power may be supplied efficiently to the electro-optical elements arranged in two directions perpendicular to each other.
  • the line thickness of the main power-supply lines is smaller than the line thickness of the basic power-supply lines.
  • the resistance of the basic power-supply lines may be reduced.
  • the basic power-supply lines are wired on the outside edges of the pixel area, and the main power-supply lines are arranged in a direction that intersects the basic power-supply lines.
  • the main power-supply lines may be arranged from the basic power-supply lines to the entire pixel area.
  • the basic power-supply lines are linearly symmetrically arranged in pairs on the outside edges of the pixel area.
  • electrical power may be supplied, in a well-balanced manner, to each electro-optical optical element arranged in the pixel area over a large area.
  • the wiring of the main power-supply lines is arranged with equal pitch.
  • electrical power may be supplied, in a well-balanced manner, to each electro-optical element.
  • the auxiliary power-supply lines intersecting the main power-supply lines are further provided.
  • the resistance of the entire power-supply wiring may be reduced.
  • the auxiliary power-supply lines are arranged in a strip pattern in a direction that intersects the main power-supply lines.
  • the resistance of the power-supply wiring may be reduced.
  • the auxiliary power-supply lines are arranged in a direction that intersects substantially orthogonally the main power-supply lines.
  • a desired amount of electrical power may be supplied, in a well-balanced manner, to the electro-optical elements. arranged in two directions perpendicular to each other.
  • the power-supply wiring is arranged so that the electro-optical elements are disposed on the pixel area and the pixel area is sectioned into a plurality of pixel groups each including at least one of the electro-optical elements, and the pixel groups receive power from different power-supply circuits.
  • the power-supply voltage may be corrected, and, as a result, the difference between power-supply circuits may be corrected.
  • FIG. 1 is a block diagram of an overview of an organic EL display panel.
  • the panel includes a plurality of pixels 10 arranged in a matrix with N rows and M columns.
  • the panel has a pixel area 11 that forms a pixel matrix, an active matrix substrate 100 including scanning line drivers 12 - 1 and 12 - 2 that output scanning line signals to each pixel 10 , and ten driver IC chips 14 - 1 to 14 - 10 lead-bonded to the outside edges of the active matrix substrate 100 .
  • the driver IC chips 14 - 1 to 14 - 10 each include a data line driver that sends data signals to each pixel 10 .
  • the driver IC chips 14 - 1 , 14 - 5 , 14 - 6 , and 14 - 10 which are each located on the corners of the active matrix substrate 100 , have power-supply circuits for supplying power to the active matrix substrate 100 .
  • the driver IC chips 14 - 1 to 14 - 10 are disposed by tape automated bonding (TAB) enclosed on tape carrier packages 13 with output leads 15 connected to electrode terminals (not shown in the drawings) of the active matrix substrate 100 via anisotropic conductive films. Data signals and electrical power are supplied to the active matrix substrate 100 from the driver IC chips 14 - 1 to 14 - 10 via the output leads 15 .
  • TAB tape automated bonding
  • FIG. 3 is a drawing describing in detail the structure of the power-supply wiring inside the active matrix substrate 100 .
  • the pixels 10 are not shown in the drawing.
  • the anode power supply to each pixel 10 is provided by forming on the periphery of the outside edges of the pixel area 11 power supply wiring with a relatively large line thickness (hereinafter referred to as ‘basic power-supply lines’), which receives a power-supply voltage from an external power supply and which forms a basic power-supply wiring system for distributing the power-supply voltage to each pixel 10 .
  • basic power-supply lines a relatively large line thickness
  • main power-supply lines power-supply wiring with a relatively small line thickness
  • main power-supply lines which branches off from the basic power-supply lines in a strip pattern
  • basic power-supply lines with a relatively low resistance which are basic lines for supplying power
  • the wiring resistance of the power-supply wiring can be reduced. Since the amount of electrical power needed for light-emitting of an organic EL element differs for each color, it is desirable to change the line thickness of the basic power-supply line for each color.
  • basic power-supply line and ‘main power-supply line’ used in this document are used only to distinguish between the two power-supply lines. They are both the same type of power-supply wiring. Therefore, unless otherwise specified, when the term ‘power-supply wiring’ is used, this includes both the basic and the main power-supply lines. This is also true for the term ‘auxiliary power-supply line’ used later.
  • the power-supply wiring preferably has, but not limited to, the following arrangement: basic power-supply lines form pairs in the periphery of the outside edges of the pixel area 11 , while the main power-supply lines are wired in strip pattern in a direction that intersects the basic power-supply lines.
  • the desirable location for arranging the basic power-supply lines is the periphery of the outside edges of the pixel area 11 .
  • the location, however, is not limited to this, and the basic power-supply wiring may be arranged inside the pixel area 11 .
  • the basic power-supply lines 16 - 1 to 16 - 6 are linearly and symmetrically arranged so that the basic power-supply lines 16 - 1 to 16 - 3 , which receive power from the driver IC chips 14 - 1 and 14 - 6 , are arranged in the vicinity of the outside edge of the pixel area 11 shown on the left side of the drawing, while the basic power-supply lines 16 - 4 to 16 - 6 , which receive power from the driver IC chips 14 - 5 and 14 - 10 , are arranged in the vicinity of the outside edge of the pixel area 11 shown on the right side of the drawing.
  • the basic power-supply lines 16 - 1 and 16 - 4 are symmetrically arranged, and, similarly, the basic power-supply lines 16 - 2 and 16 - 5 , and 16 - 3 and 16 - 6 are also symmetrically arranged.
  • the basic power-supply lines 16 - 1 and 16 - 4 are power-supply wiring for supplying an anode power to the red organic EL elements and are connected to main power-supply lines V R , which are formed on the pixel area 11 in the row direction in a strip pattern with equal pitch.
  • the basic power-supply lines 16 - 2 and 16 - 5 are power-supply wiring for supplying an anode power to the green organic EL elements and are connected to main power-supply lines V G , which are formed on the pixel area 11 in the row direction in a strip pattern with equal pitch.
  • the basic power-supply lines 16 - 3 and 16 - 6 are power-supply wiring for supplying an anode power to the blue organic EL elements, and are connected to main power-supply lines V B , which are formed on the pixel area 11 in the row direction in a strip pattern with equal pitch.
  • These main power-supply lines V R , V G , and V B are arranged in the pixel area 11 in a direction substantially.
  • the main power-supply lines V R , V G , and V B are arranged so that they are linearly symmetrical to any row in the pixel matrix.
  • data lines XmR, XmG, and XmB (1 ⁇ m ⁇ M) are arranged to form one group.
  • the scanning line drivers 12 - 1 and 12 - 2 are mounted, respectively. Both of the scanning line drivers 12 - 1 and 12 - 2 simultaneously drive each of the N number of scanning lines 17 - 1 , 17 - 2 , 17 - 3 , . . .
  • a cathode film which is a common electrode for each pixel 10 , is disposed on the upper layer of the active matrix substrate 100 . It is desirable to compose the cathode of a material that can inject as many electrons as possible, i.e. a material with a small work function.
  • a metal thin-film such as calcium, lithium, or aluminum is suitable.
  • the structure described in the above drawing is a so-called bottom-emission structure, which emits light from the active matrix substrate 100 side.
  • the structure may be a so-called top-emission structure, which uses a light-transmitting conductive film as a cathode to emit light.
  • the cathode may be a light-transmitting conductive material such as ITO or a semi-transparent conductive metal thin. layer consisting of a metal such as calcium, lithium, or aluminum, which is thin enough to transmit light. Using a semi-transparent conductive metal layer reduces the resistance of the cathode.
  • On the outermost side of the active matrix substrate 100 there are contacting portions 18 - 1 and 18 - 2 for making contact with the cathode.
  • FIG. 5 is a block diagram of the main circuit of the pixel 10 located in row n, column m.
  • this pixel 10 includes a switching transistor Tr 1 , whose gate terminal connects to the scanning line 17 -n, a capacitor C, which maintains the data signal sent from the data line XmR for one frame period, a light emitting portion OLED composed of an organic EL element, and a driving transistor Tr 2 , which receives power from the main power line V R and supplies driving power to the light-emitting portion OLED.
  • a switching transistor Tr 1 whose gate terminal connects to the scanning line 17 -n
  • a capacitor C which maintains the data signal sent from the data line XmR for one frame period
  • a light emitting portion OLED composed of an organic EL element
  • a driving transistor Tr 2 which receives power from the main power line V R and supplies driving power to the light-emitting portion OLED.
  • One pixel is composed of three sub-pixels, R, G, and B.
  • each pixel needs one scanning line 17 -n and three data lines, XmR, XmG, and XmB. Since large displays have a great number of pixels, using three data lines for one pixel causes the total number of data lines to become enormous.
  • the present invention preferably has, but not limited to, the following arrangement: analog switches 19 for switching the data signal output from the driver IC chips to data lines, XmR, XmG, or XmB may be provided to reduce the number of data lines from the driver IC chips.
  • the analog switches 19 are not essential and may be provided if required.
  • This embodiment is structured so that driver IC chips drive and control the pixels 10 , providing a driver circuit suitable for a large display panel. Furthermore, on the periphery of the outer edges of the pixel area 11 , the thick basic power-supply lines 16 - 1 to 16 - 6 are disposed in the column direction and the thin main power-supply lines are disposed in a strip pattern in the row direction from the basic power-supply lines 16 - 1 to 16 - 6 to the pixel area 11 . This structure lowers the resistance of the anode power-supply wiring, providing an electro-optical device suitable for a large display.
  • the basic power-supply lines 16 - 1 to 16 - 6 are arranged in the column direction, while the main power-supply lines are arranged in the row direction.
  • the present invention is not limited to this arrangement, and the basic power-supply lines 16 - 1 to 16 - 6 may be arranged in the row direction, while the main power-supply lines are arranged in the column direction.
  • FIG. 4 is an explanatory drawing of the arrangement of power-supply wiring related to a second embodiment according to the present invention.
  • FIG. 6 is a block diagram showing the main circuit of a pixel 10 located in row n, column m according to this embodiment.
  • reference numerals that are the same as FIGS. 3 and 5 represent the same elements as those of FIGS. 3 and 5 and the descriptions are omitted.
  • FIG. 3 and 5 represent the same elements as those of FIGS. 3 and 5 and the descriptions are omitted.
  • this pixel 10 includes a switching transistor Tr 1 , whose gate terminal connects to a scanning line 17 -( 3 n- 2 ), a capacitor C, which maintains a data signal sent from a data line Xm for one frame period, a light emitting portion OLED composed of an organic EL element, and a driving transistor Tr 2 , which receives power from a main power line V R and supplies driving power to a light-emitting portion OLED.
  • Green and blue pixels 10 also have the same circuit structure, receive power from main power-supply lines V G and V B respectively, and have a common data line Xm.
  • One pixel is composed of three sub-pixels, R, G, and B.
  • each pixel needs three scanning lines 17 -( 3 n- 2 ), 17 -( 3 n- 1 ), and 17 - 3 n and one data line Xm.
  • the number of scanning lines of example described in this embodiment is three times more than that of embodiment 1, requiring a driving frequency for scanning line drivers 12 - 1 and 12 - 2 three times more than that of the embodiment 1.
  • the number of data lines Xm required for this embodiment is 1 ⁇ 3 of that required for embodiment 1.
  • the basic arrangement of the power-supply wiring of this embodiment is the same as embodiment 1. Therefore, the same effect as in embodiment 1 may be obtained for this embodiment as well.
  • FIG. 7 is an explanatory drawing of the arrangement of power-supply wiring related to a third embodiment.
  • This embodiment is similar to embodiment 1 in that basic power-supply lines 16 - 1 to 16 - 3 are arranged in the vicinity of the outside edge of pixel area 11 shown on the left side of the drawing and basic power-supply lines 16 - 4 to 16 - 6 are arranged in the vicinity of the outside edge of the pixel area 11 shown on the right side of the drawing.
  • the basic power-supply lines 16 - 1 and 16 - 4 are power-supply lines for supplying an anode power supply to red organic EL elements and are connected to main power-supply lines V R arranged on the pixel area 11 in the row direction in a strip pattern.
  • the basic power-supply lines 16 - 2 and 16 - 5 are power-supply lines for supplying an anode power to green organic EL elements and are connected to main power-supply lines V G arranged on the pixel area 11 in the row direction in a strip pattern.
  • the basic power-supply lines 16 - 3 and 16 - 6 are power-supply lines for supplying an anode power to blue organic EL elements and are connected to main power-supply lines V B arranged on the pixel area 11 in the row direction in a strip pattern.
  • auxiliary power-supply lines 20 - 1 , 20 - 2 , 20 - 3 , . . . are further arranged in the column direction so that they intersect the main power-supply lines V R , V G , and V B .
  • the auxiliary power-supply line 20 - 1 is electrically connected to n number of main power-supply lines V R to reduce the resistance of the power-supply wiring.
  • the auxiliary power-supply lines 20 - 2 and 20 - 3 are electrically connected to n number of main power-supply lines V G and V B , respectively.
  • the anode power-supply wiring is wired within the pixel area 11 in a matrix to reduce the wiring resistance of the power-supply wiring.
  • FIG. 2 is a block diagram of an overview of an organic EL display panel for describing a fourth embodiment according to the present invention.
  • the organic EL display panel includes a pixel area 11 composed of a plurality of pixels arranged in a matrix with N rows and M columns, an active matrix substrate 100 including scanning line drivers 12 - 1 and 12 - 2 that output scanning line signals to each pixel 10 , and ten driver IC chips 14 - 1 to 14 - 10 lead-bonded to the periphery of the active matrix substrate 100 .
  • the pixel area 11 is sectioned into pixel groups (blocks) 11 - 1 to 11 - 10 , which each include a plurality of pixels. These pixel blocks 11 - 1 to 11 - 10 receive an anode power-supply from respective driver IC chips 14 - 1 to 14 - 10 . In other words, a pixel group 11 -k (1 ⁇ k ⁇ 10) receives an anode power-supply from a driver IC chip 14 -k, enabling uniform and substantial power-supply to a large display panel with a large area.
  • the arrangement of power-supply wiring of each pixel group 11 -k is not limited to this embodiment.
  • the basic power-supply lines may be arranged in the row and/or column directions, the thin main power-supply lines connected to the basic power-supply lines may be arranged in a strip pattern, and, the auxiliary power-supply lines may be arranged in a matrix to reduce the resistance of the wiring of the anode power-supply, if necessary.
  • This embodiment finely adjusts the power-supply voltage of the driver IC chips 14 - 1 to 14 - 10 to correct the difference in properties among these driver IC chips. As a result, an electro-optical device suitable for a large display panel with a high quality display performance is provided.
  • FIG. 8 is a block diagram of an overview of an organic EL display panel for describing a fifth embodiment according to the present invention.
  • the organic EL display panel includes a pixel area 11 composed of a plurality of pixels arranged in a matrix with N rows and M columns, an active matrix substrate 100 including scanning line drivers 12 - 3 to 12 - 6 that output scanning line signals to each pixel 10 , and ten driver IC chips 14 - 1 to 14 - 10 lead-bonded to the periphery of the active matrix substrate 100 .
  • the left and right scanning line drivers 12 - 3 and 12 - 4 make up a pair and simultaneously drive N/2 scanning lines 17 - 1 to 17 -(N/2), which are arranged on the upper half of the screen.
  • the left and right scanning line drivers 12 - 5 and 12 - 6 make up another pair and simultaneously drive N/2 scanning lines 17 -(N/2+1) to 17 -N, which are arranged on the lower half of the screen.
  • the scanning line drivers 12 - 5 and 12 - 6 drive the scanning lines 17 -(j+N/2) while the scanning line drivers 12 - 3 and 12 - 4 drive the scanned lines 17 -j (1 ⁇ j ⁇ N/2).
  • the driving frequency for each of scanning line drivers 12 - 3 to 12 - 6 may be reduced to 1 ⁇ 2.
  • the value of N is large for a large display, and, therefore, the number of scanning lines that can be scanned for one frame period is limited.
  • the driving frequency of the scanning line drivers 12 - 3 to 12 - 6 can be reduced so as to be suitable for a large display.
  • the arrangement of power-supply wiring within the pixel area 11 may be any arrangement described in the embodiments 1 to 4.
  • the number of scanning lines simultaneously driven is not limited to two lines; it may be 3 lines or more.
  • FIG. 1 is a block diagram of an overview of an organic EL display according to embodiment 1.
  • FIG. 2 is a block diagram of an overview of an organic EL display according to embodiment 4.
  • FIG. 3 is an explanatory drawing of the arrangement of the power-supply wiring according to embodiment 1.
  • FIG. 4 is an explanatory drawing of the arrangement of the power-supply wiring according to embodiment 2.
  • FIG. 5 is block diagram of the main pixel circuit of the pixels according to embodiment 1.
  • FIG. 6 is block diagram of the main pixel circuit of the pixels according to embodiment 2.
  • FIG. 7 is a block diagram of an overview of an organic EL display according to embodiment 3.
  • FIG. 8 is a block diagram of an overview of an organic EL display according to embodiment 5.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Electroluminescent Light Sources (AREA)
  • Devices For Indicating Variable Information By Combining Individual Elements (AREA)
  • Control Of El Displays (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)
US10/636,569 2002-09-18 2003-08-08 Electro-optical device, matrix substrate, and electronic equipment Abandoned US20040149886A1 (en)

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TW200414810A (en) 2004-08-01
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JP3977299B2 (ja) 2007-09-19
KR100556540B1 (ko) 2006-03-06
CN100349198C (zh) 2007-11-14
CN1495694A (zh) 2004-05-12
US8654040B2 (en) 2014-02-18
KR20040025559A (ko) 2004-03-24
US20090289931A1 (en) 2009-11-26

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