CN101034524B - Display method, display device, and electronic apparatus - Google Patents

Display method, display device, and electronic apparatus Download PDF

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Publication number
CN101034524B
CN101034524B CN2007100063087A CN200710006308A CN101034524B CN 101034524 B CN101034524 B CN 101034524B CN 2007100063087 A CN2007100063087 A CN 2007100063087A CN 200710006308 A CN200710006308 A CN 200710006308A CN 101034524 B CN101034524 B CN 101034524B
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Prior art keywords
image
brightness
light
viewing area
display device
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CN101034524A (en
Inventor
山田正
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Seiko Epson Corp
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Seiko Epson Corp
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Priority claimed from JP2006065210A external-priority patent/JP2007121988A/en
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    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60Q—ARRANGEMENT OF SIGNALLING OR LIGHTING DEVICES, THE MOUNTING OR SUPPORTING THEREOF OR CIRCUITS THEREFOR, FOR VEHICLES IN GENERAL
    • B60Q3/00—Arrangement of lighting devices for vehicle interiors; Lighting devices specially adapted for vehicle interiors
    • B60Q3/10—Arrangement of lighting devices for vehicle interiors; Lighting devices specially adapted for vehicle interiors for dashboards
    • B60Q3/16—Circuits; Control arrangements
    • B60Q3/18—Circuits; Control arrangements for varying the light intensity
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
    • G01R19/165—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
    • G01R19/16566—Circuits and arrangements for comparing voltage or current with one or several thresholds and for indicating the result not covered by subgroups G01R19/16504, G01R19/16528, G01R19/16533
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
    • H03M1/00—Analogue/digital conversion; Digital/analogue conversion
    • H03M1/12—Analogue/digital converters
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
    • H03M1/00—Analogue/digital conversion; Digital/analogue conversion
    • H03M1/66—Digital/analogue converters
    • 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
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/60—Circuit arrangements for operating LEDs comprising organic material, e.g. for operating organic light-emitting diodes [OLED] or polymer light-emitting diodes [PLED]
    • 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
    • G09G2320/06—Adjustment of display parameters
    • G09G2320/066—Adjustment of display parameters for control of contrast
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2360/00—Aspects of the architecture of display systems
    • G09G2360/14—Detecting light within display terminals, e.g. using a single or a plurality of photosensors
    • G09G2360/144—Detecting light within display terminals, e.g. using a single or a plurality of photosensors the light being ambient light
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L2924/00—Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
    • H01L2924/10—Details of semiconductor or other solid state devices to be connected
    • H01L2924/11—Device type
    • H01L2924/14—Integrated circuits
    • H01L2924/143—Digital devices
    • H01L2924/1434—Memory
    • H01L2924/145—Read-only memory [ROM]
    • H01L2924/1451—EPROM
    • H01L2924/14511—EEPROM

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  • Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • Mechanical Engineering (AREA)
  • Electroluminescent Light Sources (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)

Abstract

To provide a display method and a display device capable of performing an appropriate light emission control without providing an external sensor.

Description

Display packing, display device and e-machine
Technical field
 
The present invention relates to display packing, display device and e-machine.
Background technology
 
In the prior art, useful organic electroluminescent device (below be called " organic EL ") is formed on the organic electroluminescence display device and method of manufacturing same (below be called " organic EL display ") of the light-emitting component that the viewing area forms.This organic EL display because in light weight, brightness is high, field angle is big, so noticeable.
 
, when organic EL display existed the viewing area by strong outer rayed such as sunshine, the contrast of display degree descended, and the result causes the problem that is not easy to see clearly.
Therefore, in order to address the above problem, the someone has proposed the organic EL display of following proposal: in the viewing area illuminance transducer is set, utilizes this sensor determination to inject the illumination of the light of viewing area (outer light).Then, use according to the brightness of this correction as a result, promptly bright and, organic EL is carried out brightness adjustment control (for example with reference to patent documentation 1) in the not dazzling degree in the place of dark in bright place.And, in above-mentioned organic EL display, with and be intended to carry out the same organic EL of organic EL that image shows, constitute illuminance transducer, when formation is intended to carry out organic EL that image shows, pack into simultaneously.Its result has realized carrying out the display device of or not illuminance transducer is not external brightness adjustment control.
Patent documentation 1: the spy opens the 2001-35655 communique
 
, in the organic EL display of above-mentioned patent documentation 1 record, illuminance transducer need be set, so exist the problem that hinders display device miniaturization lightweight or limit its layout.In addition, for large-scale viewing area, the illumination that detects to detect the result inhomogeneous owing to the difference of the allocation position of illuminance transducer produces, often can not carry out suitable brightness adjustment control.In addition, the element characteristic that the element characteristic and being intended to that constitutes the organic EL of illuminance transducer carries out the organic EL that image shows also often can not carry out suitable brightness adjustment control not simultaneously.
Summary of the invention
]
The present invention is at the problems referred to above developments, and its purpose is to provide display packing and the display device that external sensor just can carry out suitable light modulation be not set.
 
Display packing of the present invention, it is position corresponding with intersecting of a plurality of sweep traces and a plurality of data lines on substrate, dispose the viewing area of a plurality of pixels that comprise light-emitting component rectangularly, suitably drive described each pixel according to pictorial data, show in the display packing of display device of the 1st image, detect the drive current of described each pixel, the current value and the predefined setting value of the drive current of described each pixel are compared, according to its result, switch to described the 1st image or during with the demonstration of described the 1st image behind some in different the 2nd image, show that in described viewing area described the 1st image is the normal brightness image; Described the 2nd image is compared when being the demonstration with described normal brightness image, makes the luminous high brightness image of described each light-emitting component with high brightness; When because of outside light inject described viewing area and make the drive current of pixel of described normal brightness image become the setting value of predesignating when above, switch to described high brightness image by described normal brightness image after, show in described viewing area.
 
After adopting this method, the variation according to the drive current that flows into each light-emitting component suitably shows required image.When for example light-emitting component is electroluminescent cell, after the light that is equivalent to the wavelength of its energy gap is injected, optical excitation occurs, each light-emitting component produces electromotive force.Like this, show the 1st image during, when comprising this viewing area of rayed of light of wavelength of the energy gap that is equivalent to each light-emitting component, just produce the electromotive force that optical excitation causes, the drive current change of each pixel.So, in the present invention, detect the drive current of supplying with each pixel, if during demonstration the 1st image, the viewing area is during by rayed, under described light activated effect, it is big that the drive current of the inflow viewing area integral body that detects becomes, and for example shows the 2nd luminous image of light-emitting component that makes each pixel with high brightness but make.Its result, even during the rayed viewing area, also because the light-emitting component high brightness luminescent of each pixel, institute is so that the contrast increase can improve visibility.
 
In addition, carry out the light-emitting component itself that image shows, judge and only do not shine the viewing area,,, do not limit its layout so do not hinder display device miniaturization lightweight so do not need external illuminance transducer is set because utilize.And then, carry out the light-emitting component itself that image shows because utilize, so, also can not make the result that detects of the illumination that detects produce inhomogeneous owing to the difference of the allocation position of illuminance transducer in large-scale viewing area.In addition, owing to constitute the element characteristic of the light-emitting component of illuminance transducer, can be not different with the element characteristic that is intended to carry out the light-emitting component that image shows, so can carry out suitable brightness adjustment control.
 
In this display packing, described the 1st image is the normal brightness image; Described the 2nd image is compared when being the demonstration with described normal brightness image, makes the luminous high brightness image of described light-emitting component with high brightness; When outer light was injected described viewing area, the drive current of the pixel that is produced by described normal brightness image became the setting value of predesignating when above, can switch to described high brightness image by described normal brightness image after, in the demonstration of described viewing area.
 
After adopting this method, because the viewing area during by rayed, makes the light-emitting component high brightness of each pixel, institute is so that the contrast increase can improve visibility.
In this display packing, drive current with the consumption of described normal brightness image, become the setting value of predesignating when above, supply is compared with described pictorial data, make the high brightness pictorial data of described light-emitting component with high brightness luminescent, thereby can switch to described high brightness image by described normal brightness image, show in described viewing area.
 
After adopting this method, for example possessing in the display device of the data-signal feed unit of each pixel outputting data signals, according to the drive current of supplying with each pixel, control the corresponding reference voltage of exporting with this data-signal feed unit of data-signal, thereby can carry out brightness adjustment control.
 
In this display packing, described pictorial data is in order to make described viewing area show the pictorial data of still image.
After adopting this method,,, can not carry out wrong brightness adjustment control so the change of the drive current of luminous generation own is little because the image that the viewing area shows is a still image.Its result can carry out suitable brightness adjustment control.
 
In this display packing, described display device is a display apparatus; Described normal brightness image is the panel board image.
After adopting this method, though in display apparatus, strong outer light is often injected the viewing area, even at this moment, also because of the panel board image contrast height that shows, so can improve the visibility of panel board image.
 
Display device of the present invention, it is characterized in that, it is position corresponding with intersecting of a plurality of sweep traces and a plurality of data lines on substrate, dispose the viewing area of a plurality of pixels that comprise light-emitting component rectangularly, suitably drive described each pixel according to pictorial data, show that possess: drive current detects the unit in the display device of display device of the 1st image, this drive current detects the drive current that the unit detects described pixel; Brightness control unit, this brightness control unit generates and is intended to show the 1st image and makes described each light-emitting component with the 1st luminous brightness control signal of the 1st brightness, be intended to make described each light-emitting component with and export behind luminous the 2nd brightness control signal of different brightness during the described the 1st visual demonstration; Comparing unit, this comparing unit is compared described drive current that detects and predefined setting value; Control module, this control module be according to the comparative result of described drive current that detects and predefined setting value, exports some in described the 1st brightness control signal or described the 2nd brightness control signal; Described drive current detects the unit, detects the drive current of injecting the described pixel that described viewing area produces because of outer light.
 
After adopting this device, can suitably show required image according to the variation of the drive current that flows into each light-emitting component.For example, when light-emitting component is electroluminescent cell, when the light that is equivalent to the wavelength of its energy gap is injected, optical excitation just occurs, each light-emitting component produces electromotive force.Like this, show the 1st image during, when comprising its viewing area of rayed of wavelength of the energy gap that is equivalent to each light-emitting component, just produce the electromotive force that optical excitation causes, the drive current change of each pixel.Therefore, in the present invention, detect the drive current of supplying with each pixel, if during demonstration the 1st image, the viewing area is during by rayed, under described light activated effect, it is big that the drive current of the inflow viewing area integral body that detects becomes, but but for example show the 2nd luminous image of light-emitting component that makes each pixel with high brightness.Its result, even during the rayed viewing area, also because the light-emitting component high brightness luminescent of each pixel, institute is so that the contrast increase can improve visibility.
 
In addition, only do not shine the viewing area because utilize the light-emitting component itself that carries out the image demonstration to judge, thus do not need external illuminance transducer is set, thereby do not hinder display device miniaturization lightweight or limit its layout.And then, carry out the light-emitting component itself that image shows because utilize, so for large-scale viewing area, also the result that detects of the illumination that can not occur detecting produces uneven problem owing to the difference of the allocation position of illuminance transducer.In addition, owing to constitute the element characteristic of the light-emitting component of illuminance transducer, can be not different with the element characteristic that is intended to carry out the light-emitting component that image shows, so can carry out suitable brightness adjustment control.
 
In this display device, described drive current detects the unit, can detect the drive current of the described pixel that generates when outer light is injected described viewing area.
After adopting this device, owing to, adjust the contrast of image, so can improve visibility along with the light intensity of injecting the viewing area.
 
In this display device, described brightness control unit is according to described pictorial data, generates the data-signal feed unit of exporting behind the data-signal of supplying with described each pixel; Described data-signal feed unit, can be at the drive current of described the 1st image consumption, be described setting value when above, as comparing described light-emitting component exported with pictorial data with the high brightness of high brightness luminescent described the 2nd brightness control signal with described the 1st image.
 
After adopting this device,, control the corresponding reference voltage of exporting with this data-signal feed unit of data-signal, thereby can carry out brightness adjustment control according to the drive current of supplying with each pixel.
In this display device, described display device is a display apparatus; Described the 1st image can be the panel board image.
 
After adopting this device, though in display apparatus, strong outer light is often injected its viewing area, even at this moment, also because of the panel board image contrast height that shows, so can improve the visibility of panel board image.
 
In this display device, described light-emitting component is an electroluminescent cell.
After adopting this device, electroluminescent cell optical excitation occurs during by rayed, its drive current change.But brightness adjustment control is carried out in the change of the drive current that can cause according to this optical excitation.
 
In this display device, described electroluminescent cell is an organic electroluminescent device.
After adopting this device, in possessing the display device of organic electroluminescent device, can realize not needing to be provided with the display device that external illuminance transducer ground carries out suitable brightness adjustment control.
 
E-machine of the present invention possesses above-mentioned display device.
After adopting this e-machine, possess outer light and inject the viewing area, can show that also contrast does not descend, the e-machine of the display device of the image of visibility excellence even can provide.
Description of drawings
Fig. 1 carries the stereographic map of panel board of the vehicle of display device.
Fig. 2 is the synoptic diagram of demonstration sample attitude of the image of expression velograph.
Fig. 3 is the figure of structure of the electric property of the display device that relates to of expression the 1st embodiment.
Fig. 4 is the figure of structure of the electric property of expression display module.
Fig. 5 is the figure of structure of the electric property of expression pixel.
Fig. 6 is the figure of change of the drive current that causes of optical excitation of expression organic electroluminescent device.
Fig. 7 is for the effect of telling about the display device that the 1st embodiment relates to and the process flow diagram of drawing.
Fig. 8 is the figure of structure of the electric property of the display device that relates to of expression the 2nd embodiment.
Fig. 9 is for the effect of telling about the display device that the 2nd embodiment relates to and the process flow diagram of drawing.
Embodiment
 
Below, with reference to accompanying drawing, tell about each embodiment that display device of the present invention is embodied as display apparatus.
(the 1st embodiment)
Below, with reference to Fig. 1～Fig. 7, tell about the display device that the 1st embodiment relates to.
 
As shown in Figure 1, the display apparatus of present embodiment (hereinafter to be referred as " display device ") 1, the panel board Qw that is used as the e-machine of vehicle C carries.Display device 1, at its viewing area Z, demonstration is as the visual G of the velograph of the instrument image of the speed of a motor vehicle of expression vehicle C.
 
Visual G at this viewing area Z speed of displaying meter, can switch demonstration (normal brightness image) and the employing that the normal brightness display mode that show to adopt the 1st image that shows as the normal brightness with the 1st brightness carries out and compare, on the whole the demonstration of carrying out as high brightness display mode (high brightness image) with the 2nd image of the high brightness demonstration of the 2nd brightness with this normal brightness display mode.
 
Fig. 2 is a kind of demonstration sample attitude of expression with the visual G of each pattern speed of displaying meter.In Fig. 2, the visual G of velograph is with the interval of regulation, show respectively " 0 ", " 20 ", " 40 " ..., expression such as " 160 " vehicle C the numerical value Ma of the speed of a motor vehicle.In addition, at the position that is surrounded by each numerical value Ma, display pointer Mb.Pointer Mb is center of rotation according to the speed of a motor vehicle of at that time vehicle C with its base end part Mc, rotates to show, thus the expression speed of a motor vehicle at that time.
 
Fig. 3 is the figure of drawing for the electrical structure of telling about display device 1.As shown in Figure 3, display device 1 is made of display module 2 and Control Component 3.The central authorities of display module 2 on substrate 4a possess approximate tetragonal described viewing area Z.On substrate 4a, the zone beyond the Z of viewing area (below be called " non-display area ") forms a pair of scan line drive circuit 5.In addition, at the downside of substrate 4a, the flexible printed wiring board 4b that uses anisotropic conductive film (ACF) to be connected with this substrate 4a is being set.On flexible printed wiring board 4b, the data line drive circuit 11 as control module is installed.
 
As shown in Figure 4, in the Z of viewing area, be provided with toward the direction the n root sweep trace LY1, the LY2 that extend ..., LYn and the m data lines LX1, the LX2 that extend orthogonally with each sweep trace LY1～LYn ..., LXm-1, LXm.In addition, in the Z of viewing area,, form red, green and blue respectively with pixel 8R, 8G, 8B with the corresponding position that intersects of each sweep trace LY1～LYn and each data line LX1～LXm.
 
In addition, in the Z of viewing area and data line LX1～LXm arranged side by side, prolong m root power lead Lo be set.With data line LX1, LX4 ... the power lead Lo that parallel prolongation is provided with is connected with pixel 8R with redness; With data line LX2 ..., the power lead Lo that is provided with of the parallel prolongation of LXm-1, be connected with pixel 8G with green; With data line LX3 ..., the power lead Lo that is provided with of the parallel prolongation of LXm, be connected with pixel 8B with blueness.
 
As shown in Figure 5, red possess as the redness of light-emitting component with organic EL 9R, on-off element Sw, maintenance capacitor Co and driving transistors Qd with pixel 8R.Redness is used organic EL 9R, is the organic electroluminescent device that its luminescent layer (not shown) constitutes with organic material, and in the present embodiment, luminescent layer constitutes with the well-known luminous organic material of polypenthylene class and polyphenyl class.
 
On-off element Sw, for example be that conductivity type is the transistor of N type, grid with prolong in corresponding position the sweep trace LY1, the LY2 that are provided with ... connect, drain electrode and the data line LX1, the LX4 that prolong setting in corresponding position ... connect, source electrode is connected with the electrode of capacitor Co.In addition, keep the electrode of capacitor Co to be connected with the grid of driving transistors Qd, another electrode is connected with power lead Lo.In addition, as shown in Figure 5, green pixel 8G and the blueness used with red identical with pixel 8R, so use pixel 8G and blueness to use pixel 8B for green, adopts identical symbol with the circuit structure of pixel 8B, repeats no more.
 
And as shown in Figure 4, each is red in, green and blue pixel 8R, 8G, 8B, along each sweep trace LY1～LYn, according to redness with pixel 8R → green with pixel 8G → blueness pixel 8B → redness pixel 8R → ... → blue arranged in order with pixel 8B.In addition, along data line LX1～LXm, the color of configuration same color.And be in abutting connection with 3 pixels that dispose, use red pixel 8R, the green pixel 8G of using and the blueness used to use pixel 8B, constitute a color pixel 8.
 
In addition, each organic EL 9R, 9G, 9B, when the outer light (natural light) more than certain intensity is injected viewing area Z, absorb in a plurality of wavelength that constitute this light, the light of wavelength that is equivalent to the energy gap of luminescent layer, its result by this luminescent layer, produces the electromotive force that optical excitation causes in organic EL 9R, 9G, 9B.
 
For example, when luminescent layer constitutes with well-known luminous organic material such as polypenthylene class and polyphenyl class, exposure intensity surpasses 3000[lx] outer light (natural light) time, light about wavelength 400nm wherein just is absorbed, thereby between the anode and negative electrode of each organic EL 9R, 9G, 9B, produce the electromotive force that optical excitation causes.
 
The result of Fig. 6 after to be expression to each organic EL 9R, 9G, 9B produce electromotive force that optical excitation causes and experimentize curve map.As shown in Figure 6: flow into anode and the electric current between the cathode layer (drive current) Id of each organic EL 9R, 9G, 9B, by intensity less than 3000[lx] outer light (natural light) when irradiation, roughly certain; But surpassed 3000[lx by intensity] outer light (natural light) irradiation the time, just sharply increase.
 
In addition, as shown in Figure 3, scan line drive circuit 5 clips viewing area Z, on non-display area, about each forms a pair ofly.Each scan line drive circuit 5, LY1～Lyn is connected with sweep trace.As shown in Figure 4, each scan line drive circuit 5, to sweep trace LY1～Lyn output synchronously be intended to select 8 groups of that required in the capable color pixel 8 of described n delegation's color pixels sweep signal SC1, SC2, SC3 ..., SCn.For example, make sweep trace LY1～Lyn become the 1st sweep trace LY1 → the 2nd sweep trace LY2 → the 3rd sweep trace LY3 → ... → the n sweep trace LYn → the 1st sweep trace LY1 → ... order, behind output scanning signal SC1～SCn, just select color pixel 8 of each row successively.
 
Data line drive circuit 11, as shown in Figure 4, within it portion possess the m corresponding DA converter circuit D1, D2, D3 with each data line LX1～LXm ..., Dm-1, Dm.Each DA converter circuit D1～Dm, it is well-known DA converter circuit, will be by Control Component 3 pictorial data GD output, that be intended to form the visual G of velograph at that time, be transformed into the data-signal of the size corresponding, to corresponding data line LX1～LXm output with reference voltage V k.
 
This reference voltage V k in the present embodiment, is two kinds of reference voltages---normal brightness with the high high brightness of reference voltage V kl reference voltage V kh, selects import wherein some by Control Component 3 with this normal brightness of reference voltage V kl and voltage ratio.Normal brightness reference voltage V kl is the reference voltage for the visual G that uses normal brightness display mode display speed meter.High brightness reference voltage V kh then is the reference voltage that shows for the high brightness display mode.
 
And, data line drive circuit 11 is at the pictorial data GD according to input, generation when the data-signal of each data line LX1～LXm output, the level of this data-signal, along with normal brightness with different and different with reference voltage V kh of reference voltage V kl and high brightness.In other words, the input high brightness is during with reference voltage V kh, and the level of the data-signal corresponding with pictorial data GD becomes than normal brightness and generates after with reference voltage V kl high level.Like this, even pictorial data GD is identical, organic EL 9R, the 9G of the data-signal that generates during with reference voltage V kh according to high brightness, the luminosity of 9B, organic EL 9R, the 9G of the data-signal that generates during according to normal brightness with regard to beguine, the luminosity height of 9B with reference voltage V kl.
 
And, will be called " normal brightness pictorial data (normal brightness control signal) " according to normal brightness with the data-signal that reference voltage V kl (normal brightness display mode) generates; To be called " high brightness pictorial data (high brightness control signal) " according to high brightness with the data-signal that reference voltage V kh (high brightness display mode) generates.Like this, when the high brightness display mode, the visual G of viewing area Z speed of displaying meter is just used the brightness higher than normal brightness display mode to show.
 
As shown in Figure 3, Control Component 3 to possess logic be power circuit 21, panel board with power circuit 22, as current drives detect the unit current detection circuit 23, EEPROM24, as the reference voltage generating circuit 25 of brightness control unit, as a comparison the unit panel board control circuit 26 and as the image processing circuit 27 of data-signal feed unit.
 
Logic is power circuit 21 an and panel board power circuit 22, be for according to the regulation power supply Eo that supplies with by not shown external power source circuit, generate the circuit of the various supply voltages that are intended to drive each driving circuit 5,11 that display module 2 is provided with and pixel 8R, 8G, 8B.Logic is a power circuit 21, for example according to described power supply Eo, generates the supply voltage Vs of the required level of driven sweep line drive circuit 5, data line drive circuit 11, to scan line drive circuit 5, data line drive circuit 11 outputs.Panel board according to described power supply Eo, generates supply voltage Vo with power circuit 22, does media by each power lead Lo, to each pixel 8R, 8G, 8B output.
 
Current detection circuit 23, possess resistive element 23a and simulation/data conversion circuit (below be called " A/D translation circuit ") 23b, input is by summation---the panel board drive current In of the drive current Id that flows in all pixels 8 (8R, 8G, 8B) of display module 2 outputs.And current detection circuit 23 makes this panel board dish drive current In flow into resistive element 23a, after the process of the voltage between the terminal of this resistive element 23a A/D conversion, and the panel board driving current value K of output meter dish drive current In.
 
In EEPROM24, store setting current value I s in advance as setting value.Setting current value I s in the present embodiment is decided to be and about 3000[lx] the corresponding value of size (panel board driving current value K) of the panel board drive current In that flows when injecting viewing area Z of the outer light of intensity.
 
In other words, the visual G of velograph, as shown in Figure 2, what existing numerical value Ma and base end part Mc fixed resembles, and promptly still image also has and has only pointer Mb to rotate resembling of showing, i.e. dynamic image.In addition, because pointer Mb can only be that rotate at the center with base end part Mc, so even pointer Mb rotates, the display area of pointer Mb (light-emitting area) does not change yet.Like this, during with the visual G of normal brightness display mode display speed meter, the summation of the brightness of all color pixels 8 of viewing area Z just becomes certain value substantially, and panel board drive current In at this moment becomes foreseeable standard value.And, with in the normal brightness display mode with the corresponding standard value of this foreseeable panel board drive current In, as setting current value I s.
 
Reference voltage generating circuit 25 generates 2 kinds of reference voltages that vary in size (normal brightness is with reference voltage V kl and than the normal brightness big high brightness of reference voltage V kl reference voltage V kh) of being supplied with by each DA converter circuit D1 of data line drive circuit 11～Dm.And reference voltage generating circuit 25 is according to selection signal SVl, the SVh of panel board control circuit 26 input, choice criteria brightness with reference voltage V kl and high brightness with behind some among the reference voltage V kh, to each DA converter circuit D1～Dm output.
 
The clock pulse signal CLK that panel board control circuit 26 is supplied with according to the outside generates moment signal Sa, Sb for synchro control scan line drive circuit 5 and data line drive circuit 11, to each driving circuit 5,11 output.
 
In addition, panel board control circuit 26 is read from EEPROM24 and is set current value I s.The panel board driving current value K of setting current value I s that panel board control circuit 26 will be read and current detection circuit 23 outputs is compared.Then, panel board control circuit 26 judges that panel board driving current value K when setting current value I s, know that intensity is less than 3000[lx] outer light inject viewing area Z.At this moment, become the normal brightness display mode, panel board control circuit 26 is intended to the selection signal SVl of choice criteria brightness with reference voltage V kl to reference voltage generating circuit 25 outputs.Its result, reference voltage generating circuit 25 generates normal brightness reference voltage V kl, to data line drive circuit 11 outputs.
 
In addition, panel board control circuit 26 judges that panel board driving current value K for setting current value I s when above, know that intensity is 3000[lx] more than outer light inject viewing area Z.At this moment, become the high brightness display mode, panel board control circuit 26 is intended to select the selection signal SVh of high brightness with reference voltage V kh to reference voltage generating circuit 25 outputs.Its result, reference voltage generating circuit 25 generates high brightness reference voltage V kh, to data line drive circuit 11 outputs.
 
In addition, in the present embodiment, when preestablishing into the power supply of input display device 1, panel board control circuit 26 is become the normal brightness display mode by initial fixation, and signal SVl is selected in output.
 
Image processing circuit 27, the pictorial data GD that input generates at not shown external image generative circuit.This pictorial data GD, in the present embodiment, input all the time constitutes the pointer Mb of the visual G of velograph, and other static image (fixed pattern)---digital Ma etc. then with the moment of regulation, import by phased manner.
 
Then, according to Fig. 7, tell about the effect of the display device 1 that adopts said structure.
Now, suppose car key is inserted the lockhole of pilothouse, make engine start after, power supply is just dropped into display device 1 (step S1-1).At this moment, for example on display module 2, become the normal brightness display mode by initial fixation, in the Z of viewing area in the visual G of normal brightness display mode display speed.
 
Then, the current detection circuit 23 output meter dish drive current In of Control Component 3.Like this, current detection circuit 23 detects the current value K of panel board drive current In, to 26 outputs (step S1-2) of panel board control circuit.
 
So, the setting current value I s of the 26 couples of EEPROM24 of panel board control circuit storage and compared (step S1-3) from the panel board driving current value K of current detection circuit 23.Then, judge panel board driving current value K (less than 3000[lx] the outer light of intensity when injecting viewing area Z) (NO in step S1-4) when setting current value I s, by reference voltage generating circuit 25 to each DA converter circuit D1～Dm pay standard brightness of data line drive circuit 11 with reference voltage V kl (step S1-5).
 
Like this, on display module 2, with the visual G of normal brightness display mode display speed meter.Its result, the luminosity of the visual G of velograph descends, and can not become twinkling visual G.But also can reduce power consumption.
 
Then, check whether the power supply of display device 1 disconnects (step S1-6), when continuing to drop into (ON in step S1-6), utilize the electric current of current detection circuit 23 to detect the resistive element 23a of usefulness once more, detect panel board drive current In (step S1-2).After, carry out the action of above-mentioned steps S1-2～step S1-5 repeatedly, with the visual G of normal brightness display mode display speed meter.
 
Soon, during the outer light grow of irradiation viewing area Z, panel board drive current In increases, and its current value K also becomes big.Then, outer light surpasses 3000[lx] time, when panel board control circuit 26 is judged panel board driving current value K greater than setting current value I s (YES in step S1-4).So panel board control circuit 26 is supplied with high brightness reference voltage V kh (step S1-7) by reference voltage generating circuit 25 to each DA converter circuit D1～Dm of data line drive circuit 11.
 
So, after viewing area Z switches to the high brightness display mode by the normal brightness display mode, the visual G of display speed meter.Like this, the outer light of irradiation viewing area Z becomes 3000[lx] when above, the luminosity of organic EL 9R, 9G, 9B rises, and the visual G of viewing area Z speed of displaying meter just sees clearly easily.
 
After adopting above-mentioned embodiment, can obtain following action effect.
(1) behind the above-mentioned embodiment of employing, detect summation---the panel board driving current value K that panel board drive current In is corresponding with the drive current that in each organic EL 9R, 9G, 9B, flows, this panel board driving current value K and predefined setting current value I s are compared.Then, in the normal brightness display mode, panel board driving current value K becomes and sets current value I s when above, knows that strong outer light injects viewing area Z, and switches to the high brightness display mode by the normal brightness display mode.Its result, the contrast of the visual G of velograph improves.In addition, comparator dial plate driving current value K and setting current value I s, its result, in the high brightness display mode, when panel board driving current value K becomes less than setting current value I s, know that strong outer light do not inject viewing area Z, and switch to the normal brightness display mode by the high brightness display mode.Its result, the contrast of the visual G of velograph reduces.
 
Like this, the contrast of the visual G that can not use separately the special illuminance transducer ground that is provided with to regulate the speed to count.Its result can realize the display device 1 that can not hinder the miniaturization lightweight, not limit the brightness adjustment control of its layout.
 
(2) behind the above-mentioned embodiment of employing, owing to participate in the panel board drive current In of color pixel 8 redness of demonstration with the drive current Id generation of the generation of organic EL 9R, 9G, 9B itself according to inflow, between normal brightness display mode and high brightness display mode, switch, all play a role as illuminance transducer so we can say all color pixels 8.Like this, even the big large-scale display device of viewing area Z, its illumination detect the result can not produce along with the difference of the position in the Z of viewing area yet inhomogeneous, so can carry out suitable brightness adjustment control.
 
(3) in addition, adopt above-mentioned embodiment after, on the Z of viewing area, show the visual G of velograph of the speed of expression vehicle C.Like this, even strong outer rayed viewing area Z also can prevent from not see the phenomenon of the visual G of velograph in advance.
(the 2nd embodiment)
Below, with reference to Fig. 8 and Fig. 9, tell about the display device that the 2nd embodiment relates to.
 
As shown in Figure 8, in the display device 1A that present embodiment relates to, will supply with the reference voltage V ko of DA converter circuit D1～Dm of data line drive circuit 11 as necessarily.In other words, by the reference voltage V ko of the specified level of reference voltage generating circuit 25 output.
 
In addition, the panel board control circuit 26 that present embodiment relates to is relatively read the panel board driving current value K that sets current value I s and current detection circuit 23 outputs from EEPROM24, its result is exported to image processing circuit 27.In addition, to the described external image generative circuit of image processing circuit 27 supply pictorial data GD, in the present embodiment, preparing high brightness pictorial data GD1 and normal brightness pictorial data GD2.This high brightness pictorial data GD1 even be when injecting viewing area Z for strong light, also can become the pictorial data of the image of the pattern of seeing clearly easily; Normal brightness pictorial data GD2 then is a strong light when injecting viewing area Z, compares with the image that pictorial data GD1 produces with high brightness, also is not easy the pictorial data of the image of the pattern seen clearly.
 
Image processing circuit 27, from panel board control circuit 26 input panel board driving current value K for set meaning more than the current value I s as a result the time, to described external image generative circuit, output requires high brightness to require signal Sr with pictorial data GD1.In addition, image processing circuit 27, from panel board control circuit 26 input panel board driving current value K for set meaning below the current value I s as a result the time, to described external image generative circuit, output requires normal brightness to require signal Sr with pictorial data GD2.
 
Then, according to Fig. 9, tell about the effect of the display device 1A that adopts said structure.
Now, suppose car key is inserted the lockhole of pilothouse, make engine start after, power supply is just dropped into display device 1A (step S2-1).After, the same with above-mentioned the 1st embodiment, become the normal brightness display mode by initial fixation, in the Z of viewing area, in the visual G of normal brightness display mode display speed.Then, the current detection circuit 23 output meter dish drive current In of Control Component 3.Like this, current detection circuit 23 detects the current value K of panel board drive current In, to 26 outputs (step S2-2) of panel board control circuit.
 
So, the setting current value I s of the 26 couples of EEPROM24 of panel board control circuit storage and compared (step S2-3) from the panel board driving current value K of current detection circuit 23.Then, judge panel board driving current value K (less than 3000[lx] the outer light of intensity when injecting viewing area Z) (NO in step S2-4) when setting current value I s, to image processing circuit 27 these situations of output.So image processing circuit 27 is to described external image generative circuit, output requires normal brightness to require signal Sr with pictorial data GD2.
 
Its result, described external image generative circuit, outputting standard brightness pictorial data GD2.Then, image processing circuit 27 is to data line drive circuit 11 this normal brightness of output pictorial data GD2.Like this, just on the Z of viewing area, visual (step S2-5) used in display standard brightness.
 
Then, check whether the power supply of display device 1A disconnects (step S2-6), when continuing to drop into (ON in step S2-6), utilize the electric current of current detection circuit 23 to detect the resistive element 23a of usefulness once more, detect panel board drive current In (step S2-2).After, carry out the action of above-mentioned steps S2-2～S2-6 repeatedly, continue display standard brightness with visual.
 
Soon, the outer light of irradiation viewing area Z becomes 3000[lx] when above, panel board drive current In increase, its result is also become big by the panel board driving current value K of A/D translation circuit 23b conversion.Then, judge that panel board driving current value K sets current value I s when above (3000[lx] when the outer light of above intensity is injected viewing area Z) (YES in step S1-4), exports these situations to image processing circuit 27.So image processing circuit 27 is to described external image generative circuit, output requires high brightness to require signal Sr with pictorial data GD1.
 
Its result, described external image generative circuit output high brightness pictorial data GD1.Then, image processing circuit 27 is to data line drive circuit 11 this high brightness of output pictorial data GD1.Like this, on the Z of viewing area, exhibit high brilliance image (step S2-7).
 
After adopting above-mentioned embodiment, can obtain following action effect.
(1) behind the above-mentioned embodiment of employing, image processing circuit 27 is according to the size of panel board drive current In, switch the pattern of the image that viewing area Z shows different, be intended to exhibit high brilliance with the pictorial data GD1 of the pattern of image with after being intended to the pictorial data GD2 of display standard brightness with the pattern of image, export to data line drive circuit 11.Like this, the same with above-mentioned the 1st embodiment, can realize not using the special illuminance transducer ground that is provided with separately to carry out the display device of brightness adjustment control.
 
In addition, the present invention can also specialize on following change ground.
In the respective embodiments described above, told about the situation that panel board drive current In changes along with the outer light of injecting viewing area Z.But the present invention is not limited thereto.Because panel board drive current In, beyond the light of injecting viewing area Z, also the deterioration in brightness along with the variation of atmospheric temperature and organic EL 9R, 9G, 9B changes, so during for the deterioration in brightness of the variation of atmospheric temperature and organic EL 9R, 9G, 9B, also can detect the variation of this panel board drive current In, show thereby switch to suitable image back.At this moment, can use the temperature sensor that is arranged on the panel board periphery to detect atmospheric temperature.In addition, the detecting of the deterioration in brightness of organic EL 9R, 9G, 9B then can be estimated according to the light a lamp count value etc. of time of accumulation.
 
In the respective embodiments described above, car key inserted the lockhole of pilothouse, when making the power supply of engine start, input display device 1, use the visual G of normal brightness display mode at viewing area Z display speed meter.When display device 1 drops into power supply, can detect panel board drive current In at this moment, at this moment panel board drive current In as setting current value I s, is shown after it is switched to the visual G of velograph of high brightness display mode.At this moment, can carry out suitable brightness adjustment control to the visual G of firm velograph after display device 1 drops into power supply.
 
In the respective embodiments described above, be embodied as DA converter circuit D1～Dm, the reference voltage V k that control is supplied with by this DA converter circuit D1～Dm, thereby after switching to normal brightness display mode or high brightness display mode, the visual G of display speed meter.For example it can be changed over brightness control unit as the panel board of supply line voltage Vo with power circuit 22, this panel board is prepared two kinds of voltages with power circuit 22: normal brightness voltage and the high brightness voltage higher than this normal brightness voltage.And panel board control circuit 26 is not controlled reference voltage V k, but controller dial plate electricity consumption source circuit 22, thereby supply with the visual G of display speed meter behind switching standards luminance voltage or the high brightness voltage.Like this, also can obtain and above-mentioned same effect
 
In the respective embodiments described above, as an example, display device 1 and display packing that the velograph that will represent the speed of a motor vehicle shows as visual G have been told about.But the revolution that also can be embodied in the engine revolution of the expression vehicle C beyond the display speed meter is taken into account the display device of meters (showing merit and warning) etc.
 
In the respective embodiments described above, the visual G of viewing area Z speed of displaying meter only shows numerical value Ma and pointer Mb.But except numerical value Ma and pointer Mb, can also show the mark of detent pilot lamp and various warnings.
 
In the respective embodiments described above, adopt the display device 1 of using organic EL 9R, 9G, 9B as light-emitting component, but in the display device of the light-emitting component beyond the organic EL 9R, the 9G that use other, 9B, also can use the present invention.Generally speaking, so long as the sort of light-emitting component of the electromotive force that the light time generation optical excitation of the wavelength of absorption regulation causes, which is all right.
 
In the respective embodiments described above, as e-machine, told about the panel board Qw of vehicle C.But be not limited thereto, can be in instrument with extensively adopting in the display device.

Claims (10)

1. display packing, be on substrate, to have disposed in the viewing area of a plurality of pixels rectangularly, suitably drive described each pixel according to pictorial data, thereby the display packing that shows the display device of the 1st image, described pixel is included in the light-emitting component of the crossover location of corresponding a plurality of sweep trace and a plurality of data lines, it is characterized in that:
Detect the drive current of described each pixel, the current value of the drive current of described each pixel is compared with predefined setting value, according to its result, switch in described viewing area and to show described the 1st image or some in different the 2nd image during with the demonstration of described the 1st image
Described the 1st image is the normal brightness image;
Described the 2nd image is compared when being the demonstration with described normal brightness image, makes the luminous high brightness image of described each light-emitting component with high brightness;
When because of outside light inject described viewing area and make the drive current of pixel of described normal brightness image become the setting value of predesignating when above, switch to described high brightness image by described normal brightness image after, show in described viewing area.
2. display packing as claimed in claim 1, it is characterized in that: when the drive current that consumes at described normal brightness image becomes the setting value of predesignating when above, make the high brightness pictorial data of described light-emitting component by supplying with to compare with high brightness luminescent with described pictorial data, thereby switch to described high brightness image by described normal brightness image, show in described viewing area.
3. display packing as claimed in claim 1 or 2 is characterized in that: described pictorial data is to be used to make described viewing area to show the pictorial data of still image.
4. display packing as claimed in claim 1 or 2 is characterized in that: described display device is a display apparatus; Described normal brightness image is the panel board image.
5. display device, on substrate, disposed the viewing area of a plurality of pixels rectangularly, show the 1st image thereby suitably drive described each pixel according to pictorial data, described pixel is included in the light-emitting component of the crossover location of corresponding a plurality of sweep trace and a plurality of data lines, it is characterized in that:
Possess:
Drive current detects the unit, and this unit detects the drive current of described pixel;
Brightness control unit, this unit generates and exports the 1st brightness control signal and the 2nd brightness control signal, described the 1st brightness control signal is used to make described each light-emitting component with luminous the 1st image that shows of the 1st brightness, and described the 2nd brightness control signal is used to make the different brightness when showing with described the 1st image of described each light-emitting component luminous;
Comparing unit, compare the described drive current that detects in this unit with predefined setting value; And
Control module, this unit be according to the comparative result between described drive current that detects and the predefined setting value, exports some in described the 1st brightness control signal or described the 2nd brightness control signal;
Described drive current detects the unit, detects the drive current of injecting the described pixel that described viewing area produces because of outer light.
6. display device as claimed in claim 5 is characterized in that: described brightness control unit is according to described pictorial data, generates and export the data-signal feed unit of the data-signal of supplying with described each pixel;
Described data-signal feed unit, the drive current that consumes at described the 1st image are described setting value when above, make the high brightness pictorial data of described light-emitting component with high brightness luminescent as comparing with described the 1st image, export described the 2nd brightness control signal.
7. as claim 5 or 6 described display device, it is characterized in that: described display device is a display apparatus; Described the 1st image is the panel board image.
8. as claim 5 or 6 described display device, it is characterized in that: described light-emitting component is an electroluminescent cell.
9. display device as claimed in claim 8 is characterized in that: described electroluminescent cell is an organic electroluminescent device.
10. an e-machine is characterized in that: possess each described display device of claim 5～9.
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Publication number Priority date Publication date Assignee Title
JP2005308775A (en) * 2004-04-16 2005-11-04 Sanyo Electric Co Ltd Display device and electric equipment with display device
CN1744178A (en) * 2004-08-31 2006-03-08 东北先锋电子股份有限公司 Drive device of light emitting display panel

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