KR20080108727A - Light emission device and display device using the light emission device as a light source - Google Patents

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

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Publication number
KR20080108727A
KR20080108727A KR1020070056669A KR20070056669A KR20080108727A KR 20080108727 A KR20080108727 A KR 20080108727A KR 1020070056669 A KR1020070056669 A KR 1020070056669A KR 20070056669 A KR20070056669 A KR 20070056669A KR 20080108727 A KR20080108727 A KR 20080108727A
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KR
South Korea
Prior art keywords
light emitting
emitting device
substrate
spacer
light
Prior art date
Application number
KR1020070056669A
Other languages
Korean (ko)
Inventor
이상진
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.)
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Application filed by 삼성에스디아이 주식회사 filed Critical 삼성에스디아이 주식회사
Priority to KR1020070056669A priority Critical patent/KR20080108727A/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 KR20080108727A publication Critical patent/KR20080108727A/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
    • 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

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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)
  • Liquid Crystal (AREA)
  • Cathode-Ray Tubes And Fluorescent Screens For Display (AREA)
  • Planar Illumination Modules (AREA)

Abstract

A light emission device and a display device using the light emission device as a light source is provided to reduce the power consumption by decreasing the loss of light caused by the diffusing plate. A light emitting device(100) comprises the first substrate and the second substrate, the electronics emission unit(18), the luminous unit(20), and the spacer(34). The first substrate and the second substrate are arranged to be faced each other. The electronics emission unit is positioned on the one side of the first substrate. The luminous unit is positioned on the one side of the second substrate. The luminous unit is lighted by the electronics emitted from the electronics emission unit. The spacer is positioned between the first substrate and the second substrate. The length of one side wall of the spacer is in the range of 0.2mm to 5mm.

Description

Light emitting device and display device using the light emitting device as a light source {LIGHT EMISSION DEVICE AND DISPLAY DEVICE USING THE LIGHT EMISSION DEVICE AS A 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 partial plan view of the light emitting unit and the spacer illustrated in FIG. 1.

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

FIG. 5 is a partial cross-sectional view of the display panel shown in FIG. 4.

<Description of reference numerals for the main parts of the drawings>

100: light emitting device 18: electron emission unit

20: light emitting unit 22: cathode electrode

26 gate electrode 28 electron emission portion

29: anode electrode 30: fluorescent layer

32: reflective film 34: spacer

40: display panel 42: diffuser plate

The present invention relates to a light emitting device and a display device using the light emitting device as a light source, and more particularly, to a spacer for maintaining a constant distance between a first substrate and a second substrate in a light emitting device.

When all the devices capable of recognizing that light is emitted from the outside are light emitting devices, the light emitting device having an electron emission unit and driving electrodes on a first substrate and an anode electrode and a fluorescent layer on a second substrate is provided. Known. After the edges of the first substrate and the second substrate are integrally bonded by the sealing member, the inner space is exhausted to form a vacuum container together with the sealing member.

In the light emitting device, the electron emission unit emits electrons toward the fluorescent layer, and these electrons excite the fluorescent layer to emit visible light from the fluorescent layer. In this case, the anode electrode is an acceleration electrode for attracting an electron beam, and receives a direct current voltage (anode voltage) of several thousand volts from a power source outside the vacuum vessel to maintain the fluorescent layer in a high potential state.

The light emitting device includes spacers between the first substrate and the second substrate to support the compressive force applied to the vacuum container. Since the fluorescent layer cannot emit light in the region where the spacer is located, the spacers are mainly located at the boundary between the pixel regions.

The above-described light emitting device may be used as a light source in a display device having a light receiving display panel. In this case, a diffusion plate for increasing luminance uniformity is used in front of the light emitting device, and the use of the diffusion plate can overcome the visibility problem of showing spacer positions even when the size of the spacer increases.

However, when the spacer becomes excessively large, in order to solve the problem of visibility of the spacer, the distance between the light emitting device and the diffusion plate or the diffusion plate having a low transmittance should be used. There is a problem that is greatly reduced.

Therefore, the present invention is to solve the above problems, the present invention is to provide a light emitting device having a spacer of the optimum size and to facilitate the installation of the spacer while minimizing the reduction of the luminance by the diffusion plate and the light emitting device as a light source To provide a display device to be used.

A light emitting device according to an embodiment of the present invention includes a first substrate and a second substrate that are disposed to face each other, an electron emission unit positioned on one surface of the first substrate, and an electron emission unit positioned on one surface of the second substrate. And a spacer positioned between the first substrate and the second substrate, wherein the spacer has a length of one side of 0.2 to 5 mm.

The spacer may have a rectangular columnar shape having horizontal and vertical sides.

The electron emission unit may include cathode and gate electrodes that are insulated from each other, and electron emission portions electrically connected to the cathode electrode. In this case, the gate electrodes may be positioned above the cathode electrodes, and the spacer may be positioned between the gate electrodes.

The light emitting unit includes an anode electrode and a fluorescent layer located on one surface of the anode electrode, and the anode electrode may receive a voltage of 10 to 15 kV.

A display device according to an embodiment of the present invention includes a display panel displaying an image and a light emitting device providing light to the display panel. The light emitting device emits light by the first and second substrates disposed opposite to each other, an electron emission unit located on one surface of the first substrate, and electrons emitted from the electron emission unit located on one surface of the second substrate. The unit includes a spacer positioned between the first substrate and the second substrate, and the spacer has a length of one side of 0.2 to 5 mm.

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. The light emitting device may form 2 to 99 pixels in a row direction and a column direction, and the display panel may be a liquid crystal display panel.

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.

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 the light emitting device according to an embodiment of the present invention, and FIG. 3 is a part of the light emitting unit and the spacer shown in FIG. Top view.

First, referring to FIGS. 1 and 2, the light emitting device 100 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.

A region located inside the sealing member 16 among 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 electron emission unit 18 is positioned in the effective area of the inner surface of the first substrate 12, and the light emitting unit 20 for emitting the visible light is located in the effective area of the inner surface of the second substrate 14.

Referring to FIG. 2, the electron emission unit 18 includes cathode electrodes 22 formed in a stripe pattern along one direction of the first substrate 12, and the cathode electrode 22 with an insulating layer 24 interposed therebetween. Gate electrodes 26 formed in a stripe pattern along a direction intersecting with each other), and electron emission parts 28 electrically connected to the cathode electrodes 22.

The gate electrodes 26 may be positioned side by side in the row direction (the x-axis direction shown in FIG. 2) of the light emitting device 100, and may function as a scan electrode by receiving a scan driving signal. The cathode electrodes 22 may be positioned side by side in the column direction (y-axis direction shown in FIG. 2) of the light emitting device 100, and may function as a data electrode by receiving a data driving signal.

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

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.

In the above structure, one intersection region of the cathode electrode 22 and the gate electrode 26 may correspond to one pixel region of the light emitting device 100, or two or more intersection regions may correspond to one pixel region of the light emitting device 100. Can be. In the second case, two or more cathode electrodes 22 and / or two or more gate electrodes 26 corresponding to one pixel area are electrically connected to each other to receive the same driving voltage.

Next, the light emitting unit 20 includes an anode electrode 29, a fluorescent layer 30 located on one surface of the anode electrode 29, and a reflective film 32 located on one surface of the fluorescent layer 30. .

The anode electrode 29 is formed of a transparent conductive film such as indium tin oxide (ITO) so as to transmit visible light emitted from the fluorescent layer 30. The anode electrode 29 is applied with a high-voltage anode voltage from a power supply (not shown) outside the vacuum vessel to maintain the fluorescent layer 30 in a high potential state.

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 reflective film 32 may be made of an aluminum thin film having a thin thickness of several thousand ohms strong and fine holes for electron beam passage. The reflective film 32 reflects the visible light emitted toward the first substrate 12 of the visible light emitted from the fluorescent layer 30 toward the second substrate 14 to increase the luminance of the light emitting surface.

On the other hand, the anode electrode 29 made of a transparent conductive film is omitted, and the metal reflective film 32 may function as an anode electrode by receiving an anode voltage.

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 cathode electrode 22 and the gate electrode 26, and may be positioned between the gate electrodes 26, for example. The spacer 34 may be made of glass or ceramic.

The light emitting device 100 having the above-described configuration is driven by supplying a predetermined voltage to the cathode electrodes 22, the gate electrodes 26, and the anode electrode 29 from outside the vacuum vessel. When the light emitting device 100 is used as a light source in the display device, the anode electrode 29 is applied with a high voltage of 10 kV or more, preferably 10 to 15 kV.

When the cathode electrodes 22 and the gate electrodes 26 are applied with a predetermined driving voltage, an electric field is formed around the electron emission part 28 in the pixel region where the voltage difference between the two electrodes is greater than or equal to the threshold, and electrons are emitted therefrom. The emitted electrons are attracted by the high voltage applied to the anode electrode 29 and collide with the corresponding fluorescent layer 30 to emit light. The emission intensity of the fluorescent layer 30 for each pixel corresponds to the electron beam emission amount of the corresponding pixel.

Referring to FIG. 3, the light emitting device 100 according to the exemplary embodiment of the present invention includes a spacer 34 having a side length of 0.2 mm to 5 mm.

More specifically, the spacer 34 is formed in a rectangular columnar shape having a horizontal side and a vertical side, and at least one of the length L1 of the horizontal side and the length L2 of the vertical side is formed of 0.2 mm to 5 mm.

When the lengths L1 and L2 of one side of the spacer 34 are less than 0.2 mm, it is difficult to load the spacer 34 onto the first substrate 12 or the second substrate 14, and thus the spacer during the loading operation. A problem may arise in which the 34 leaves the substrate.

When the lengths L1 and L2 of one side of the spacer 34 are greater than 5 mm, the light emitting device 100 and the diffusion plate (not shown) may be due to visibility problems in which the seat of the spacer 34 is observed outside the light emitting device. Problem of increasing the distance between the panels or decreasing the transmittance of the diffusion plate. When the transmittance of the diffuser plate is lowered, the decrease in luminance of light passing through the diffuser plate increases. Accordingly, the light emitting device must generate higher brightness to compensate for the decrease in brightness, which leads to a problem of increasing strategic consumption.

In the case where the light emitting device 100 is used as a light source, it is advantageous to maintain the transmittance of the diffuser plate at 80% or more in terms of reducing the reduction in luminance, and the lengths L1 and L2 of one side of the spacer 34 are within 5 mm. In this case, a diffusion plate having a transmittance of 80% or more can be used.

4 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, and FIG. 5 is a partial cross-sectional view of the display panel shown in FIG. 4.

4 and 5, the display device 200 according to the present exemplary embodiment includes a light emitting device 100 and a display panel 40 positioned in front of the light emitting device 100. A diffusion plate 42 may be disposed between the light emitting device 100 and the display panel 40 to evenly diffuse the light emitted from the light emitting device 100, and the diffusion plate 42 and the light emitting device 100 may be predetermined. Away from you.

The display panel 40 is formed of a liquid crystal display panel or another light receiving display panel. The case where the display panel 40 is a liquid crystal display panel is described below.

The display panel 40 includes a lower substrate 46 on which a plurality of thin film transistors (TFTs) 44 are formed, an upper substrate 50 on which a color filter layer 48 is formed, and the substrates 46 and 50. ) And a liquid crystal layer 52 injected therebetween. Polarizers 54 and 56 are attached to the upper surface of the upper substrate 50 and the lower surface of the lower substrate 46 to polarize light passing through the display panel 40.

On the inner surface of the lower substrate 46, transparent pixel electrodes 58 whose driving is controlled by the TFTs 44 are located for each sub-pixel, and the color filter layer 48 and the inner surface of the upper substrate 50 are located. The transparent common electrode 60 is located. The color filter layer 48 includes a red filter layer, a green filter layer, and a blue filter layer that are positioned one by one for each subpixel.

When the TFT 44 of a specific subpixel is turned on, an electric field is formed between the pixel electrode 58 and the common electrode 60, and the alignment angle of the liquid crystal molecules is changed by the electric field, and the light is changed according to the changed arrangement angle. Permeability changes. The display panel 40 may control luminance and emission color of each pixel through this process.

In Fig. 4, reference numeral 62 denotes a gate circuit board assembly for transmitting a gate driving signal to the gate electrode of each TFT 44, and reference numeral 64 denotes a data circuit for transmitting a data driving signal to the source electrode of each TFT 44. Represents the board assembly.

The light emitting device 100 forms fewer pixels than the display panel 40 so that one pixel of the light emitting device 100 corresponds to two or more pixels of the display panel 40. The light emitting device 100 may form 2 to 99 pixels in a row direction and a column direction. Each pixel of the light emitting device 100 may emit light corresponding to the highest gray level among the pixels of the display panel 40 corresponding thereto, and may represent 2 to 8 bits of gray level.

For convenience, a pixel of the display panel 40 is called a first pixel, a pixel of the light emitting device 100 is called a second pixel, and first pixels corresponding to one second pixel are called a first pixel group.

In the driving process of the light emitting device 100, a signal controller (not shown) controlling the display panel 40 detects the highest gray level among the first pixels of the first pixel group, and according to the detected gray level. Calculate the grayscale required to emit the second pixel and convert it to digital data, generate driving signals of the light emitting device 100 using digital data, and generate driving signals of the light emitting device 100 using the generated driving signals. It may include applying to.

The driving signal of the light emitting device 100 includes a scan driving signal and a data driving signal. One of the above-described cathode electrode and gate electrode (eg, a gate electrode) receives a scan driving signal, and the other electrode (eg, a cathode electrode) receives a data driving signal.

The scan circuit board assembly and the data circuit board assembly for driving the light emitting device 100 may be located on the rear surface of the light emitting device 100. In FIG. 4, reference numeral 66 denotes a first connection member connecting the cathode electrode and the data circuit board assembly, and reference numeral 58 denotes a second connection member connecting the gate electrode and the scan circuit board assembly. Reference numeral 70 denotes a third connecting member for connecting the anode electrode and the power supply unit.

As described above, when the image is displayed in the corresponding first pixel group, the second pixel of the light emitting device 100 emits light with a predetermined gray level in synchronization with the first pixel group. That is, the light emitting device 100 provides light of high brightness in a bright area and light of low brightness in a dark area of a screen implemented by the display panel 40. Therefore, the display device 200 according to the present exemplary embodiment may increase the contrast ratio of the screen and implement more clear image 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.

Since the light emitting device of the present invention can use a diffusion plate having a transmittance of 80% or more, it is possible to reduce the loss of light caused by the diffusion plate, lower the power consumption, and ensure convenience of the spacer loading operation. 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 contrast ratio of the screen.

Claims (10)

A first substrate and a second substrate disposed to face each other; An electron emission unit located on one surface of the first substrate; A light emitting unit positioned on one surface of the second substrate and emitting light by electrons emitted from the electron emission unit; And Spacer positioned between the first substrate and the second substrate Including; The spacer is a light emitting device having a side length of 0.2 to 5mm. The method of claim 1, The spacer is a light emitting device having a rectangular columnar shape having a horizontal side and a vertical side. The method of claim 1, The light emitting unit includes an anode electrode and a fluorescent layer located on one surface of the anode, wherein the anode electrode receives a voltage of 10 to 15kV. The method of claim 1, The electron emission unit includes cathode and gate electrodes that are insulated from each other, and electron emission portions electrically connected to the cathode electrode. The method of claim 4, wherein Wherein the gate electrodes are positioned above the cathode electrodes, and the spacer is positioned between the gate electrodes. The method of claim 4, wherein 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 And a display panel to form first pixels, the light emitting device to form a smaller number of second pixels than the first pixels, and to independently control light emission intensity for each second pixel. The method of claim 8, And the light emitting device forms 2 to 99 pixels in a row direction and a column direction. The method of claim 7, wherein A display device wherein the display panel is a liquid crystal display panel.
KR1020070056669A 2006-11-14 2007-06-11 Light emission device and display device using the light emission device as a light source KR20080108727A (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
KR1020070056669A KR20080108727A (en) 2007-06-11 2007-06-11 Light emission device and display device using the light emission device as a 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
KR1020070056669A KR20080108727A (en) 2007-06-11 2007-06-11 Light emission device and display device using the light emission device as a light source

Publications (1)

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KR20080108727A true KR20080108727A (en) 2008-12-16

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KR1020070056669A KR20080108727A (en) 2006-11-14 2007-06-11 Light emission device and display device using the light emission device as a light source

Country Status (1)

Country Link
KR (1) KR20080108727A (en)

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