KR20080090156A - Light emission device and display device using the same as light source - Google Patents

Light emission device and display device using the same as light source Download PDF

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Publication number
KR20080090156A
KR20080090156A KR1020070033310A KR20070033310A KR20080090156A KR 20080090156 A KR20080090156 A KR 20080090156A KR 1020070033310 A KR1020070033310 A KR 1020070033310A KR 20070033310 A KR20070033310 A KR 20070033310A KR 20080090156 A KR20080090156 A KR 20080090156A
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KR
South Korea
Prior art keywords
light emitting
substrate
emitting device
light
spacer
Prior art date
Application number
KR1020070033310A
Other languages
Korean (ko)
Inventor
신종훈
Original Assignee
삼성에스디아이 주식회사
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 삼성에스디아이 주식회사 filed Critical 삼성에스디아이 주식회사
Priority to KR1020070033310A priority Critical patent/KR20080090156A/en
Priority to JP2007229411A priority patent/JP4731531B2/en
Priority to US11/860,335 priority patent/US20080111460A1/en
Priority to TW096135704A priority patent/TW200823952A/en
Priority to EP07120253A priority patent/EP1923903B1/en
Priority to CN2007101698928A priority patent/CN101183637B/en
Publication of KR20080090156A publication Critical patent/KR20080090156A/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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J1/00—Details of electrodes, of magnetic control means, of screens, or of the mounting or spacing thereof, common to two or more basic types of discharge tubes or lamps
    • H01J1/02—Main electrodes
    • H01J1/30—Cold cathodes, e.g. field-emissive cathode
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J1/00—Details of electrodes, of magnetic control means, of screens, or of the mounting or spacing thereof, common to two or more basic types of discharge tubes or lamps
    • H01J1/54—Screens on or from which an image or pattern is formed, picked-up, converted, or stored; Luminescent coatings on vessels
    • H01J1/62—Luminescent screens; Selection of materials for luminescent coatings on vessels
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J2201/00—Electrodes common to discharge tubes
    • H01J2201/30—Cold cathodes
    • H01J2201/304—Field emission cathodes
    • H01J2201/30446—Field emission cathodes characterised by the emitter material
    • H01J2201/30453—Carbon types

Abstract

The light emitting device according to the embodiment of the present invention is disposed opposite to each other to constitute a vacuum container, the first substrate and the second substrate, the electron emission unit provided on the first substrate, the electrons provided on the second substrate and emitted from the electron emission unit The light emitting unit which emits light by the light emitting unit and the spacer which maintains the space | interval of a 1st board | substrate and a 2nd board | substrate are included. Here, the second substrate is divided into an effective region in which actual light is emitted and an invalid region located outside the effective region, wherein the area of the spacer located in the effective region is S1 and the area of the effective region is S2. The light emitting device according to the example satisfies the following conditions.

0.1% ≤ (S1 / S2) x 100 ≤ 1.5%

Description

Light emitting device and display device using the light emitting device as a light source {LIGHT EMISSION DEVICE AND DISPLAY DEVICE USING THE SAME AS LIGHT SOURCE}

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

2 is a partially exploded perspective view of a light emitting device according to an embodiment of the present invention.

3 is a view showing the arrangement of the spacer according to an embodiment of the present invention.

4 is a partial plan view illustrating a fluorescent layer, a black layer, and a spacer in a light emitting device according to another exemplary embodiment of the present invention.

5 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 employing the same as a light source, and more particularly, to a spacer for maintaining a distance between a first substrate and a second substrate in a light emitting device.

A display device having a light receiving display panel such as a liquid crystal display panel requires a light source for providing light to the display panel. In general, light emitting devices having a cold cathode fluorescent lamp (CCFL) and a light emitting diode (LED) type are widely used as light sources of display devices.

Since the CCFL is a linear light source, the light generated by the CCFL can be evenly dispersed toward the display panel through the optical sheet 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.

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

Accordingly, recently, a light emitting device that emits light using an electron emission characteristic by an electric field has been proposed as a light emitting device to replace the CCFL method and the LED method. This light emitting device has advantages of low power consumption, large size, and no need for a large number of optical members as surface light sources.

However, the light emitting device includes a spacer between the first substrate and the second substrate to support the compressive force generated by the pressure difference between the inside and the outside of the vacuum container. This spacer is located in the black layer and is typically designed to be as small as possible so as not to cause visibility problems of the spacer. As the size of the spacer decreases, the area occupied by the spacer on the substrate also decreases.

Here, the visibility problem of the spacer refers to a phenomenon in which the spacer is sensed due to a difference in luminance or the like in the place where the spacer is located and other places due to the electron beam distortion phenomena around the spacer.

If the area occupied by the spacer is small, the visibility problem of the spacer may be improved, but loading work for mounting the spacer on the substrate becomes difficult, and in some cases, the spacer may be dropped from the substrate.

On the contrary, if the area occupied by the spacer becomes large, a problem of visibility of the spacer occurs, and optical members having a low transmittance and a high diffusivity are required to remove the spacer. Therefore, a problem arises in that the light loss due to this optical member is increased.

Therefore, the present invention is to solve the above problems, an object of the present invention is to minimize the light loss generated from the optical member that can be disposed due to the visibility of the spacer while the optimal area ratio to ensure the convenience of the spacer loading operation A light emitting device having a spacer having a light emitting device and a display device using the light emitting device as a light source are provided.

A light emitting device according to an embodiment of the present invention includes a first substrate and a second substrate, which are disposed to face each other and constitute a vacuum container, an electron emission unit provided on the first substrate, and an electron emission unit provided on the second substrate. A light emitting unit which emits light by electrons emitted by the light emitting device, and a spacer which maintains a gap between the first substrate and the second substrate, wherein the second substrate includes an effective region where actual light is emitted and an invalid region located outside the effective region. The following conditions are satisfied when the area of the spacer located in the effective area is S1 and the area of the effective area is S2.

0.1% ≤ (S1 / S2) x 100 ≤ 1.5%

The spacer may have a columnar or wall shape.

The light emitting unit may include a fluorescent layer and an anode electrode formed on one surface of the fluorescent layer, and the anode electrode may receive a voltage of 10 kV or more. The fluorescent layer may be separated into a plurality, and a black layer may be further formed between the fluorescent layers.

The electron emission unit may emit electrons electrically connected to one of the first and second electrodes and any one of the first and second electrodes formed along an intersecting direction while maintaining an insulation state. It may include wealth. The electron emission unit may include at least one of a carbonaceous material and a nanometer size material.

A display device according to an embodiment of the present invention includes the above-described 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.

The display panel may form first pixels, and the light emitting device may form a smaller number of second pixels than the first pixels, and independently control luminance of 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 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 a light emitting device according to an embodiment of the present invention, and FIG. 3 is a layout of a spacer according to an embodiment of the present invention. The figure for showing.

First, referring to FIGS. 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 are partitioned into an effective region A contributing to the actual visible light emission inside the sealing member 16 and an invalid region NA surrounding the effective region. The effective area A of the first substrate 12 is provided with an electron emission unit 18 for emitting electrons, and the effective area A of the second substrate 14 has a light emitting unit 20 for emitting visible light. Is provided.

The electron emission unit 18 includes first and second electrodes 22 and 26 formed in a stripe pattern in a direction crossing each other with the insulating layer 24 interposed therebetween, and the first electrode 22. 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 22, the first electrode 22 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 and the 1st electrode 22 will be a gate electrode.

An electrode positioned along the row direction (x-axis direction in the drawing) of the light emitting device 10 among the first electrode 22 and the second electrode 26 functions as a scan electrode, and the column direction ( The electrode positioned along the y-axis direction in the figure serves as a data electrode.

In the drawing, the electron emission unit 28 is formed on the first electrode 22, the first electrodes 22 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 22 and the second electrodes 26 are not limited to the above-described example and may be variously modified.

Openings 261 and 241 are formed in the second electrode 26 and the insulating layer 24 at each intersection of the first electrode 22 and the second electrode 26 to expose a part of the surface of the first electrode 22. The electron emission part 28 is positioned on the first electrode 22 inside the opening 241 of the insulating layer 24.

The electron emission unit 28 is a kind of electron emission layer having a predetermined thickness and diameter. The electron emission unit 28 may be formed of materials emitting electrons when an electric field is applied in vacuum, for example, 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 22 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 22 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 22 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. The first case is shown in the figure.

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. The red, green, and blue fluorescent layers may be divided and positioned in a predetermined pattern in one pixel area.

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 22 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.

The light emitting device 10 having the above-described configuration applies a predetermined driving voltage to the first electrodes 22 and the second electrodes 26 from the outside of the vacuum container, and the direct current amount of thousands of volts or more to the anode electrode 32. Drive by applying voltage. The driving voltage is applied through the driving pad portion 38, and the anode voltage is applied through the anode pad portion 40.

Then, in the pixels where the voltage difference between the first electrode 22 and the second electrode 26 is greater than or equal to the threshold, an electric field is formed around the electron emission unit 28 to emit electrons 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 luminance of the fluorescent layer 30 for each pixel corresponds to the electron beam emission amount of the pixel.

Meanwhile, in the above-described embodiment, the first substrate 12 and the second substrate 14 may be positioned at relatively large intervals of 5 to 20 mm. The anode electrode 32 may be provided with a high voltage of about 10 kV or more, preferably about 10 to 15 kV, through the anode pad part 40. The light emitting device 10 according to the present exemplary embodiment may implement a maximum luminance of about 10,000 cd / m 2 or more in the center of the effective region through the above-described configuration.

In the light emitting device 10 according to the embodiment of the present invention, the ratio of the area of the effective area A to the area of the effective area A, that is, the area ratio R, satisfies the following condition. do.

0.1% ≤ R ≤ 1.5%

Here, the area ratio R may be expressed by the following equation when the total area of the spacer 34 is S1 and the area occupied by the effective area A in the second substrate 14 is S2.

R = (S1 / S2) × 100

When the area ratio R exceeds 1.5%, the size of the spacer 34 increases, so that the diffusion plate and the diffusion sheet having a low transmittance in order to eliminate the difference in luminance and the like generated between the portion where the spacer 34 is located and other portions thereof. Since the light loss is large. When the area ratio R is less than 0.1%, the size of the spacer 34 becomes small, which makes loading difficult.

That is, the range of the area ratio R is an optimal range in consideration of the light loss generated by the spacer 34 and the loading operation of the spacer.

Referring to FIG. 3, a light emitting device having a spacer 34 within the area ratio R will be described.

In the case of the 7-inch light emitting device, the area S2 of the effective area A is about 144 cm 2. Here, when 12 square columnar spacers 34 each having a side length of 2 mm are arranged at regular intervals in the effective area A, the total area S1 of the spacers 34 is 48 mm 2, which is an area ratio. In terms of (R), it becomes about 0.33%.

As described above, the area ratio R may be appropriately designed by adjusting the size and number of the spacers 34, that is, the length and number of one side of the spacer 34.

Meanwhile, although only the square columnar spacer 34 has been described above, the present invention is not limited thereto and may be applied to spacers having various shapes such as a columnar shape, a cross column shape, and a wall shape.

4 is a partial plan view illustrating a fluorescent layer, a black layer, and a spacer in a light emitting device according to another exemplary embodiment of the present invention.

The light emitting device according to the embodiment of the present invention includes a fluorescent layer 36 and a black layer 38 disposed between the fluorescent layer 36 as a light emitting unit. Here, as shown in FIG. 4, the spacer 34 may be positioned in the center region of the four fluorescent layers 36 and may involve not only the black layer 38 but also the fluorescent layer 36. This is because when the light emitting device is used as a light source of the display device, the non-light emitting area of the fluorescent layer 36 can be compensated for by the function of the diffusion member.

5 is an exploded perspective view of a display device according to an exemplary embodiment in which the above-described light emitting device is used as a light source.

Referring to FIG. 5, the display device 50 of the present exemplary embodiment includes a light emitting device 10 and a display panel 52 positioned in front of the light emitting device 10. The display panel 52 is formed of a liquid crystal display panel or another light receiving display panel.

A diffusion plate 54 may be disposed between the light emitting device 10 and the display panel 52 to uniformly diffuse the light emitted from the light emitting device 10 and provide the light to the display panel 52. The light emitting device 10 is spaced apart by a predetermined distance.

The light emitting device 10 forms fewer pixels than the display panel 52 so that one pixel of the light emitting device 10 corresponds to two or more pixels of the display panel 52. Each pixel of the light emitting device 10 may emit light corresponding to the highest gray level among the pixels of the display panel 52 corresponding thereto, and the light emitting device 10 may express a gray level of 2 to 8 bits for each pixel. have.

For convenience, a pixel of the display panel 52 is called a first pixel, a pixel of the light emitting device 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 driving process of the light emitting device 10, a signal controller (not shown) that controls the display panel 52 detects the highest gray level among the first pixels of the first pixel group, and according to the detected gray level Computing the grayscale required for pixel emission, and converting the grayscale to digital data, and generating a driving signal of the light emitting device 10 using the digital data. The driving signal of the light emitting device 10 includes a scan driving signal and a data driving signal.

The second pixel of the light emitting device 10 emits light with a predetermined gray level in synchronization with the first pixel group when an image is displayed in the corresponding first pixel group. As such, the light emitting device 10 independently controls luminance for each pixel to provide light of an appropriate intensity to the pixels of the display panel 52 corresponding to each pixel. 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 spacer having an optimal area ratio, thereby facilitating the loading operation of the spacer while minimizing light loss generated from the optical member.

In addition, the display device according to the present invention using the above-described light emitting device as a light source can improve the display quality by increasing the dynamic contrast ratio of the screen, and can reduce the overall power consumption by reducing the power consumption of the light source, a large display device of 30 inches or more It can be produced easily.

Claims (8)

A first substrate and a second substrate disposed opposite to each other to constitute a vacuum container; An electron emission unit provided on the first substrate; A light emitting unit provided on the second substrate and emitting light by electrons emitted from the electron emitting unit; And Spacer to maintain the gap between the first substrate and the second substrate Including; The second substrate is divided into an effective area where actual light is emitted and an invalid area located outside the effective area, A light emitting device that satisfies the following conditions when an area of the spacer located in the effective area is S1 and an area of the effective area is S2. 0.1% ≤ (S1 / S2) x 100 ≤ 1.5% The method of claim 1, The spacer has a columnar or wall-shaped light emitting device. The method of claim 1, The light emitting unit includes a fluorescent layer and an anode electrode formed on one surface of the fluorescent layer, The anode electrode receives a voltage of 10kV or more. The method of claim 3, And a plurality of fluorescent layers are formed separately, and a black layer is further formed between the fluorescent layers. The method of claim 1, The electron emission unit, First and second electrodes formed along an intersecting direction while maintaining an insulation state with each other; and And an electron emission unit electrically connected to any one of the first electrodes and the second electrodes. The method of claim 5, The light emitting device of claim 1, wherein the electron emission unit comprises at least one of a carbon-based material and a nanometer-sized material. 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 luminance for each of the second pixels.
KR1020070033310A 2006-11-14 2007-04-04 Light emission device and display device using the same as light source KR20080090156A (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
KR1020070033310A KR20080090156A (en) 2007-04-04 2007-04-04 Light emission device and display device using the same as light source
JP2007229411A JP4731531B2 (en) 2006-11-14 2007-09-04 Light emitting device and display device using this light emitting device as light source
US11/860,335 US20080111460A1 (en) 2006-11-14 2007-09-24 Light emission device and display device using the light emission device as a light source
TW096135704A TW200823952A (en) 2006-11-14 2007-09-26 Light emission device and display device using the light emission device as a light source
EP07120253A EP1923903B1 (en) 2006-11-14 2007-11-08 Light emission device and display device using the light emission device as a light source
CN2007101698928A CN101183637B (en) 2006-11-14 2007-11-14 Light emission device and display device using the light emission device as a light source

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1020070033310A KR20080090156A (en) 2007-04-04 2007-04-04 Light emission device and display device using the same as light source

Publications (1)

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KR20080090156A true KR20080090156A (en) 2008-10-08

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KR1020070033310A KR20080090156A (en) 2006-11-14 2007-04-04 Light emission device and display device using the same as light source

Country Status (1)

Country Link
KR (1) KR20080090156A (en)

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