KR20080077497A - Light emission device and display - Google Patents

Light emission device and display Download PDF

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Publication number
KR20080077497A
KR20080077497A KR1020070017111A KR20070017111A KR20080077497A KR 20080077497 A KR20080077497 A KR 20080077497A KR 1020070017111 A KR1020070017111 A KR 1020070017111A KR 20070017111 A KR20070017111 A KR 20070017111A KR 20080077497 A KR20080077497 A KR 20080077497A
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KR
South Korea
Prior art keywords
light emitting
substrate
electrodes
emitting device
resistance layer
Prior art date
Application number
KR1020070017111A
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Korean (ko)
Inventor
전필구
Original Assignee
삼성에스디아이 주식회사
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Priority to KR1020070017111A priority Critical patent/KR20080077497A/en
Publication of KR20080077497A publication Critical patent/KR20080077497A/en

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    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices
    • G02F1/133602—Direct backlight
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J29/00—Details of cathode-ray tubes or of electron-beam tubes of the types covered by group H01J31/00
    • H01J29/02—Electrodes; Screens; Mounting, supporting, spacing or insulating thereof
    • H01J29/08—Electrodes intimately associated with a screen on or from which an image or pattern is formed, picked-up, converted or stored, e.g. backing-plates for storage tubes or collecting secondary electrons
    • H01J29/085—Anode plates, e.g. for screens of flat panel displays
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J2329/00—Electron emission display panels, e.g. field emission display panels
    • H01J2329/02—Electrodes other than control electrodes
    • H01J2329/08—Anode electrodes

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  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • Mathematical Physics (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)
  • Liquid Crystal (AREA)

Abstract

A light emitting device and a display are provided to prevent an arching between an anode electrode and a driving electrode by employing a high electric resistance layer between an anode electrode and a ground unit. A first substrate(12) and a second substrate(14) are arranged to be opposite to each other. A sealing member(16) is located at an edge of the first substrate and the second substrate. First electrodes(24) and second electrodes(26) are located on the first substrate to be insulated from each other. Thermoelectron emission units(28) are electrically connected to the first electrodes or the second electrodes. A light emitting unit is provided on the second substrate. The light emitting unit includes a fluorescent layer(30) and an anode electrode(32). A ground unit(36) is arranged on the first substrate to be separated from the first electrodes and a second electrodes. A high electrical resistance layer(38) connects the light emitting unit to the ground, so that a micro-current flows between the light emitting unit and the ground unit.

Description

Light Emitting Device and Display {LIGHT EMISSION DEVICE AND DISPLAY}

1 is a partial cross-sectional view of a light emitting device according to an embodiment of the present invention.

FIG. 2 is a partially exploded perspective view of the light emitting device shown in FIG. 1.

3 is a diagram illustrating an equivalent circuit of a light emitting device according to an embodiment of the present invention.

4 is an exploded perspective view of a display device according to an exemplary embodiment.

The present invention relates to a light emitting device and a display device, and more particularly, to a resistive layer connected to an anode electrode.

Recently, a liquid crystal display device, which is a type of flat panel display device, has been widely used in place of a cathode ray tube. The liquid crystal display has a characteristic of changing the amount of light transmission for each pixel by using the dielectric anisotropy of the liquid crystal whose twist angle changes according to the applied voltage.

Such a liquid crystal display is a representative non-emission display that displays an image with the help of an external light source, and basically includes a liquid crystal display panel and a backlight unit that provides light to the liquid crystal display panel. The liquid crystal display panel receives light emitted from the backlight unit and transmits or blocks the light by the action of the liquid crystal layer to realize a predetermined image.

Cold Cathode Fluorescent Lamps (CCFLs, hereinafter referred to as "CCFLs"), Light Emitting Diodes (LEDs, hereinafter referred to as "LEDs") are known as backlight units.

On the other hand, a field emission display (FED, hereinafter referred to as 'FED') that displays by using an electron emission characteristic by an electric field is known, and a study for using this FED as a backlight unit of a liquid crystal display device Development is in progress.

Since the CCFL is a line light source, the light generated by the CCFL may be evenly dispersed toward the liquid crystal display panel through the optical member such as the diffusion sheet, the diffusion plate, and the prism sheet.

However, in the CCFL method, since the light generated by the CCFL passes through the optical member, considerable light loss occurs, and power consumption is high because the light must be emitted at a high intensity from the CCFL in consideration of the light loss. In addition, the CCFL method is difficult to apply to a large display device of 30 inches or more because it is difficult to large area structure.

In general, a plurality of LEDs are provided as a point light source, and are combined with optical members such as a reflective sheet, a light guide plate, a diffusion sheet, a diffusion plate, and a prism sheet to constitute a backlight unit. This LED method has the advantages of fast response speed and excellent color reproducibility, but has a disadvantage of high price and large thickness.

In addition, the FED is a surface light source, the power consumption is small, there is an advantage in large size.

However, the conventional FED includes an anode electrode to which a high pressure is applied to several electrons or more to accelerate the electrons emitted from the electron emission part, and electrons continuously accumulate due to the collision of electrons emitted from the electron emission part. . If these accumulated electrons are not emitted to the outside smoothly, the accumulated electrons cause arcing inside the FED.

In particular, when the FED is used as a backlight unit, since a high brightness is required, a higher voltage is applied to the anode electrode than when the display device is used, and the above problem becomes more serious.

In addition, since the conventional backlight unit is always turned on at a constant brightness while driving the display device, there is a problem that it is difficult to meet the image quality improvement required for the display device.

For example, when the liquid crystal display panel displays an arbitrary screen including a bright portion and a dark portion according to an image signal, the backlight unit provides light of different intensities to the region displaying the bright portion and the region displaying the dark portion. If so, it is possible to realize a screen having excellent dynamic contrast.

However, the above-described backlight unit cannot implement the above functions, and thus the conventional liquid crystal display device has a limitation in increasing the dynamic contrast ratio of the screen.

Accordingly, the present invention is to solve the above problems, an object of the present invention is to provide a light emitting device that can ensure a more stable driving characteristics by allowing a fine current flows between the anode electrode and the internal ground.

Another object of the present invention is to provide a light emitting device capable of dividing a light emitting surface into a plurality of areas and independently controlling the light emission intensity for each divided area, and a display device using the light emitting device as a backlight unit to increase the dynamic contrast ratio of a screen. To provide.

In order to achieve the above object, the present invention provides a first substrate and a second substrate disposed opposite to each other, a sealing member located at an edge between the first substrate and the second substrate, and is insulated from each other on the first substrate First and second electrodes, electron emission parts electrically connected to any one of the first and second electrodes, light emission provided on the second substrate and including a fluorescent layer and an anode electrode A light emitting device including a unit, a ground part spaced apart from the first electrodes and the second electrodes on the first substrate, and a high resistance layer connecting the light emitting unit and the ground part to allow a microcurrent to flow therebetween Provide the device.

The high resistance layer may have a specific resistance value in the range of 10 9 to 10 13 Ωcm and may be connected between the anode electrode and the ground portion. The high resistance layer may be formed in close contact with the inner side of the sealing member, and may be formed along the circumference of the sealing member. The high resistance layer may gradually increase in specific resistance from the light emitting device toward the ground portion.

The present invention also provides a display device including a light emitting device and a display panel positioned in front of the light emitting device to receive light emitted from the light emitting device to display an image.

When the display panel forms the first pixels, the light emitting device may form a smaller number of second pixels than the first pixels, and independently control the light emission intensity for each second pixel.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention. As those skilled in the art would realize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention. In the drawings, parts irrelevant to the description are omitted in order to clearly describe the present invention, and like reference numerals designate like elements throughout the specification.

1 is a partial cross-sectional view of a light emitting device according to an embodiment of the present invention, Figure 2 is a partially exploded perspective view of the light emitting device shown in FIG.

1 and 2, the light emitting device 10 according to the present exemplary embodiment includes a first substrate 12 and a second substrate 14 that are disposed to face each other in parallel at predetermined intervals. Sealing members 16 are disposed on the edges of the first substrate 12 and the second substrate 14 to bond the two substrates, and the inner space is evacuated with a vacuum of approximately 10 −6 Torr so that the first substrate 12 The second substrate 14 and the sealing member 16 constitute a vacuum container.

The first substrate 12 and the second substrate 14 may be divided into an effective region contributing to the actual visible light emission and an ineffective region surrounding the effective region. The effective area of the first substrate 12 is provided with an electron emission unit 18 for electron emission, and the effective area of the second substrate 14 is provided with a light emission unit 20 for visible light emission.

The electron emission unit 18 includes first electrodes 24 and second electrodes 26 formed in a stripe pattern along a direction crossing each other with the insulating layer 22 therebetween, and the first electrode 24. And electron emission parts 28 electrically connected to any one of the second and second electrodes 26.

When the electron emission portion 28 is formed on the first electrode 24, the first electrode 24 becomes a cathode electrode for supplying current to the electron emission portion 28, and the second electrode 26 is a cathode electrode. An electric field is formed by the voltage difference between and the gate electrode is used to induce electron emission. On the contrary, when the electron emission part 28 is formed in the 2nd electrode 26, the 2nd electrode 26 will be a cathode electrode and the 1st electrode 24 will be a gate electrode.

An electrode positioned along the row direction (x-axis direction in FIG. 2) of the light emitting device 10 among the first electrode 24 and the second electrode 26 may function as a scan electrode. An electrode positioned along the column direction (y-axis direction in FIG. 2) may function as a data electrode.

In the drawing, the electron emission part 28 is formed on the first electrode 24, the first electrodes 24 are positioned along the column direction of the light emitting device 10, and the second electrodes 26 are light emitting devices. The case where it located along the row direction of (10) was shown. The position of the electron emitter 28 and the arrangement directions of the first electrodes 24 and the second electrodes 26 are not limited to the above-described example and may be variously modified.

Openings 261 and 221 are formed in the second electrode 26 and the insulating layer 22 at each crossing region of the first electrode 24 and the second electrode 26 to expose a part of the surface of the first electrode 24. The electron emission part 28 is positioned on the first electrode 24 inside the opening 221 of the insulating layer 22.

The electron emission unit 28 is a kind of electron emission layer having a predetermined thickness and diameter, and may be formed of materials emitting electrons when a electric field is applied in vacuum, such as a carbon-based material or a nanometer-sized material.

The electron emission unit 28 may include, for example, a material selected from the group consisting of carbon nanotubes, graphite, graphite nanofibers, diamonds, diamond-like carbons, fullerenes (C 60 ), silicon nanowires, and combinations thereof. Screen printing, direct growth, chemical vapor deposition or sputtering can be applied as the preparation method.

The electron emitters 28 are gathered and positioned in the middle portion of the intersection region of the first electrode 24 and the second electrode 26 except for an edge in consideration of electron beam spreading characteristics.

In the above structure, one intersection area of the first electrode 24 and the second electrode 26 corresponds to one pixel area of the light emitting device 10, or two or more crossing areas are one pixel area of the light emitting device 10. It can correspond to. In the second case, two or more first electrodes 24 or two or more second electrodes 26 corresponding to one pixel area may be electrically connected to each other to receive the same driving voltage.

Next, the light emitting unit 20 includes a fluorescent layer 30 and an anode electrode 32 positioned on one surface of the fluorescent layer 30. The fluorescent layer 30 may be formed of a white fluorescent layer or a combination of red, green, and blue fluorescent layers. In the drawings, the former case is illustrated.

The white fluorescent layer may be formed on the entirety of the second substrate 14, or may be divided and disposed in a predetermined pattern such that one white fluorescent layer is positioned in each pixel area.

On the other hand, when the light emitting device 10 is applied to a display displaying an image, the fluorescent layer 30 should be a combination of red, green and blue fluorescent layers. In this case, the red, green, and blue fluorescent layers may be divided into a predetermined pattern in one pixel area, and a black layer (not shown) may be disposed therebetween.

The anode electrode 32 may be formed of a metal film such as aluminum (Al) covering the surface of the fluorescent layer 30. The anode electrode 32 is an acceleration electrode for attracting an electron beam to maintain the fluorescent layer 30 in a high potential state by applying a high voltage and radiate toward the first substrate 12 of visible light emitted from the fluorescent layer 30. Visible light is reflected toward the second substrate 14 to increase the brightness of the screen.

In addition, spacers 34 are disposed between the first substrate 12 and the second substrate 14 to support the compressive force applied to the vacuum container and to keep the distance between the two substrates constant. The spacer 34 may be positioned outside the cross region of the first electrode 24 and the second electrode 26, and may be positioned between the second electrodes 26, for example. The spacer 34 may be made of glass or ceramic.

In addition, the ground portion 36 is disposed on the first substrate 12 so as not to be short-circuited with the first electrode 24 and the second electrode 26. The ground portion 36 may be disposed not only on the first substrate 12 but also on the insulating layer 22 with a predetermined distance from the second electrode 26. The ground portion 36 holds the ground inside the vacuum vessel.

In addition, a high resistance layer 38 is positioned between the anode electrode 32 and the ground portion 36 to connect them to each other. The high resistance layer 38 allows a microcurrent to flow between the anode electrode 32 and the ground portion 36, thereby collecting electrons that may accumulate in the fluorescent layer 30 and the anode electrode 32. It emits to the outside through, and when there is a sudden rise or fall of the current in the anode electrode 32, it serves to buffer the sudden current change.

The high resistance layer 38 is formed to partially cover the anode electrode 32 and the ground portion 36 to reduce the resistance between each other.

In addition, the high resistance layer 38 may have a specific resistance value in the range of 10 9 to 10 13 Ωcm so that a microcurrent flows between the anode electrode 32 and the ground portion 36. When the specific resistance of the high resistance layer 38 is less than 10 9 m 3, the risk of short circuit increases between the anode electrode 32 and the ground portion 36, and the specific resistance of the high resistance layer 38 is 10 13 m 3. When the cm is exceeded, the high resistance layer 38 is close to the insulating layer, so that the flow of fine current does not occur.

The high resistance layer 38 may be made of chromium oxide or carbon-based (graphite) material.

In addition, the high resistance layer 38 may be in close contact with the inner surface of the sealing member 16, and in this case, the high resistance layer 38 may be formed entirely along the circumference of the sealing member 16.

In addition, the high resistance layer 38 may gradually increase in specific resistance from the anode electrode 32 toward the ground portion 36. Such a resistance component can prevent a rapid flow of current by flowing a leakage current.

The light emitting device 10 having the above-described configuration applies a predetermined driving voltage to the first electrodes 24 and the second electrodes 26 from the outside of the vacuum vessel, and the direct current amount of thousands of volts or more to the anode electrode 32. Drive by applying voltage.

Then, in the pixels where the voltage difference between the first electrode 24 and the second electrode 26 is greater than or equal to the threshold, an electric field is formed around the electron emission unit 28, and electrons are emitted therefrom, and the emitted electrons are attracted to the anode voltage to correspond. It emits light by colliding with a portion of the fluorescent layer 30. The emission intensity of the fluorescent layer 30 for each pixel corresponds to the electron beam emission amount of the corresponding pixel.

In the driving process as described above, a microcurrent corresponding to the resistance value of the high resistance layer 38 flows between the anode electrode 32 and the ground portion 36. As a result, electrons accumulated in the anode electrode 32 and the fluorescent layer 30 are discharged to the outside, and arcing that may occur between the anode electrode 32 and the first and second electrodes 24 and 26 is suppressed.

When the light emitting device of the above-described embodiment is used as a backlight unit, the anode electrode 32 is 10 kV or more, preferably about 10 to 15 kV, through the anode pad part so as to realize a maximum brightness of about 10,000 cd / m 2 or more in the center of the effective area. Apply a high voltage of. Accordingly, the light emitting device of this embodiment maintains a large distance between the first substrate 12 and the second substrate 14 in the range of 5 to 20 mm in order to eliminate electrical instability such as a short in the vacuum container due to the application of a high voltage. do.

3 is a diagram illustrating an equivalent circuit of a light emitting device according to an embodiment of the present invention.

Referring to FIG. 3, when the scan voltage V G is applied to the second electrode 26 and the anode voltage V A is applied to the anode electrode 32, due to the electron emission of the electron emission part 28. Current AV G flows. At this time, the high resistance layer 38 corresponds to the resistor R2 connected in parallel in the equivalent circuit, so that a portion of the current flowing through the anode electrode 32 flows.

4 is an exploded perspective view of a display device according to an exemplary embodiment.

Referring to FIG. 4, the display device 50 according to the present exemplary embodiment includes a display panel 52 that forms a plurality of pixels in a row direction and a column direction, and is positioned behind the display panel 52 to the display panel 52. And a light emitting device 10 for providing light. Hereinafter, for convenience, the light emitting device will be referred to as a backlight unit.

For example, a liquid crystal display panel may be applied to the display panel 50, and an optical member such as a diffusion plate or a diffusion sheet may be disposed between the liquid crystal display panel 52 and the light emitting device 10 as necessary.

In the present exemplary embodiment, the backlight unit 10 forms a smaller number of pixels than the display panel 52 along the row direction and the column direction so that one pixel of the backlight unit 10 corresponds to the plurality of display panel 52 pixels. Do it. Each pixel of the backlight unit 10 may emit light corresponding to the highest gray level among the pixels of the display panel 52 corresponding to the pixel, and the backlight unit 10 may display 2 to 8 bits of gray level for each pixel. Can be.

For convenience, a pixel of the display panel 52 is called a first pixel, a pixel of the backlight unit 10 is called a second pixel, and a plurality of first pixels corresponding to one second pixel is called a first pixel group. .

In the above-described driving of the backlight unit 10, the signal controller 54 controlling the display panel 52 detects the highest gray level among the first pixels of the first pixel group, and emits the second pixel according to the detected gray level. Calculating the grayscale required for the conversion to digital data, and generating a drive signal of the backlight unit 10 by using the digital data. Accordingly, when the image is displayed in the corresponding first pixel group, the second pixel of the backlight unit 10 may emit light with a predetermined gray level in synchronization with the first pixel group.

The row direction may be defined as one direction of the display device 50, for example, the horizontal direction (the x-axis direction of the drawing) of the screen implemented by the display panel 52, and the column direction may be different from that of the display device 50. One direction, for example, may be defined as a vertical direction (y-axis direction of the drawing) of the screen implemented by the display panel 52.

The display panel 52 may form 240 or more pixels along the row direction and the column direction, and the backlight unit 10 may form 2 to 99 pixels along the row direction and the column direction. When the number of pixels of the backlight unit 10 in the row direction and the column direction exceeds 99, driving of the backlight unit 10 may be complicated and increase in cost for manufacturing a driving circuit.

As such, the backlight unit 10 is a kind of self-luminous display panel having a resolution of 2 × 2 to 99 × 99. The backlight unit 10 independently controls the light emission intensity for each pixel to provide an appropriate intensity for the pixels of the display panel 52 corresponding to each pixel. To provide light. Therefore, the display device 50 according to the present exemplary embodiment may increase the dynamic contrast of the screen, and implement a clearer picture quality.

Although the preferred embodiments of the present invention have been described above, the present invention is not limited thereto, and various modifications and changes can be made within the scope of the claims and the detailed description of the invention and the accompanying drawings. Naturally, it belongs to the range of.

The light emitting device according to the present invention includes a high resistance layer between the anode electrode and the ground portion, thereby preventing arcing between the anode electrode and the driving electrode, and suppressing a sudden change in current of the anode electrode, thereby ensuring stable driving characteristics. Prevents damage to the electrodes. In addition, the light emitting device according to the present invention has a ground portion therein to eliminate ground floating caused by external noise.

In addition, the display device using the above-described light emitting device as a backlight unit can improve the display quality by increasing the contrast of the screen and the dynamic contrast ratio of the screen, and can reduce the overall power consumption by reducing the power consumption of the backlight unit, a large size of 30 inches or more It can be easily manufactured as a display device.

Claims (8)

A first substrate and a second substrate disposed to face each other; A sealing member positioned at an edge between the first substrate and the second substrate; First and second electrodes positioned to be insulated from each other on the first substrate; Electron emission parts electrically connected to any one of the first electrodes and the second electrodes; A light emitting unit provided on the second substrate and including a fluorescent layer and an anode electrode; A ground part spaced apart from the first electrodes and the second electrodes on the first substrate; And A high resistance layer connecting the light emitting unit and the ground to allow a minute current to flow between the light emitting unit and the ground; Light emitting device comprising a. The method of claim 1, The high resistance layer has a resistivity value in the range of 10 9 to 10 13 Ωcm. The method of claim 1, And the high resistance layer is connected between the anode electrode and the ground portion. The method of claim 1, The high resistance layer is formed in close contact with the inner surface of the sealing member. The method of claim 4, wherein The high resistance layer is formed along the circumference of the sealing member. The method of claim 1, And the high resistance layer gradually increases a specific resistance value from the light emitting device toward the ground portion. The light emitting device according to any one of claims 1 to 6; And A display panel positioned in front of the light emitting device to display an image by receiving light emitted from the light emitting device; Display device comprising a. The method of claim 7, wherein The display panel forms first pixels, And the light emitting device forms a smaller number of second pixels than the first pixels, and independently controls the light emission intensity for each of the second pixels.
KR1020070017111A 2007-02-20 2007-02-20 Light emission device and display KR20080077497A (en)

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KR1020070017111A KR20080077497A (en) 2007-02-20 2007-02-20 Light emission device and display

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