KR20080088875A - Display device - Google Patents

Abstract

A display device is provided to support and fix a light emitting panel entirely with respect to a load direction by using a fixing member, thereby stably fixing the light emitting panel. An electron emission type light emitting panel(200) is applied to emit light. A display panel(100) is located on the light emitting panel, and displays an image by receiving the light. A fixing member(400) supports mounting of the light emitting panel. The fixing member comprises the following. A body unit supports one plate surface of the light emitting panel as facing one plate surface of the light emitting panel. A fixing unit has a thickness thicker than the body unit, and is installed in one edge of the body unit. The fixing unit supports at least one edge of the light emitting panel.

Description

Display device {DISPLAY DEVICE}

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

FIG. 2 is an exploded perspective view of the fixing member of FIG. 1. FIG.

3 is a partial cross-sectional view taken along the line III-III of FIG. 1.

4 is a partially exploded perspective view of the light emitting panel of FIG. 1.

FIG. 5 is a partial cross-sectional view taken along the line VV of FIG. 4.

The present invention relates to a display device, and more particularly, to a display device capable of stably mounting a light emitting panel by improving a mounting structure of the light emitting panel.

Liquid crystal display devices are known as light-receiving display devices in which a light source is required. The liquid crystal display device includes a display panel including a liquid crystal layer and a polarizing plate, and a light emitting panel that provides light to the display panel, and the display panel receives light emitted from the light emitting panel and converts the light into the action of the liquid crystal layer and the polarizing plate. By transmitting or blocking, a predetermined image is realized.

Cold Cathode Fluorescent Lamp (CCFL, hereinafter referred to as CCFL) and Light Emitting Diode (LED) as point light sources are used to supply light to the liquid crystal display. ) Is used.

A field emission type light emitting panel used as a light source of a liquid crystal display includes an electron emission unit and driving electrodes on a rear substrate, and a fluorescent layer and an anode electrode on a front substrate. The fluorescent layer is excited by the electrons emitted from the electron emission unit to emit light. The field emission panel has lower power consumption, larger size, and simplified structure compared to CCFL and LED.

An object of the present invention is to provide a display device having a fixing member capable of stably mounting a light emitting panel used as a light source of the display device.

According to an exemplary embodiment of the present invention, a display device includes an electron emission type light emitting panel adapted to emit light, a display panel positioned on the light emitting panel to display an image by receiving light, and a fixing member supporting mounting of the light emitting panel. It includes. The fixing member has a body portion for supporting one plate surface of the light emitting panel facing one plate surface of the light emitting panel, and a fixing portion having a thickness thicker than the thickness of the body portion and installed at one edge of the body portion to support at least one edge of the light emitting panel. It includes.

The display device may further include a support part which extends in the same direction as the direction in which the fixing part extends and which is attached to the fixing part in a direction perpendicular to the plate surface. Here, the support part may include a first support part attached to the fixing part and a second support part attached to the first support part in a direction perpendicular to the plate surface. The thickness of the first support may be smaller than the thickness of the second support. The thickness of the fixture is substantially the same as or thicker than the thickness of the second support.

The light emitting panel may include a first substrate and a second substrate disposed to face each other, the fixing portion may support the first substrate, and the second support portion may support the second substrate. The light emitting panel may further include a sealing member disposed along edges of the first substrate and the second substrate between the first substrate and the second substrate, and the first support may support the sealing member. The first support part may protrude more toward the light emitting panel side than the fixing part and the second support part. The second support portion may protrude further toward the light emitting panel side than the fixing portion.

The fixing part may be installed while surrounding the corners at both ends of one edge of the body part. The first support part may include an extension part extending along one edge of the light emitting panel, and a protrusion extending in a direction away from the light emitting panel from the center of the fixing part and the extension part. The protruding portion and the fixing portion may be screwed together, and a portion of the fixing portion surrounding the corner portions of both edges of the body portion and the extension portion may be screwed.

The light emitting panel may include a first substrate and a second substrate disposed to face each other, an electron emission unit provided on the first substrate, and a light emitting unit provided on the second substrate. The electron emission unit may include a cathode electrode formed on the first substrate, an electron emission portion adapted to be electrically connected to the cathode electrode, and a gate electrode electrically insulated from the cathode electrode. The light emitting unit includes a fluorescent layer and an anode electrode formed on the second substrate, and a voltage of 10 kV to 20 kV may be applied to the anode electrode. The display panel may be a liquid crystal display panel.

Hereinafter, exemplary embodiments of the present invention will be described 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 can easily understand, the embodiments described below may be modified in various forms without departing from the concept and scope of the present invention. Where possible, the same or similar parts are represented using the same reference numerals in the drawings.

When a portion is referred to as being "above" another portion, it may be just above the other portion or may be accompanied by another portion in between. In contrast, when a part is mentioned as "directly above" another part, no other part is intervened in between.

It is to be understood that the terms first, second and third are used to describe various parts, components, regions, layers and / or sections, but are not limited to these. These terms are only used to distinguish one part, component, region, layer or section from another part, component, region, layer or section. Accordingly, the first portion, component, region, layer or section described below may be referred to as the second portion, component, region, layer or section without departing from the scope of the invention.

The terminology used herein is for reference only to specific embodiments and is not intended to limit the invention. As used herein, the singular forms “a,” “an,” and “the” include plural forms as well, unless the phrases clearly indicate the opposite. As used herein, the term "comprising" embodies a particular characteristic, region, integer, step, operation, element, and / or component, and other specific characteristics, region, integer, step, operation, element, component, and / or group. It does not exclude the presence or addition of.

Terms indicating relative spaces such as "below" and "above" may be used to more easily describe the relationship between different parts of one part shown in the drawings. These terms are intended to include other meanings or operations of the device in use with the meanings intended in the figures. For example, when the device in the figure is reversed, any parts described as being "below" of other parts are described as being "above" other parts. Thus, the exemplary term "below" encompasses both up and down directions. The device can be rotated 90 degrees or at other angles, the terms representing relative space being interpreted accordingly.

Unless defined otherwise, all terms including technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art. Commonly defined terms used are additionally interpreted as having a meaning consistent with the related technical literature and the presently disclosed contents, and are not interpreted as ideal or very formal meaning unless defined.

In an embodiment of the invention, the light emitting panel comprises a flat panel or a curved panel. Other types of panels may be included.

1 schematically illustrates an exploded view of a display device 1000 according to an exemplary embodiment.

Referring to FIG. 1, the display device 1000 according to the present exemplary embodiment includes a display panel 100, a light emitting panel 200, and a diffusion plate 300. The display device 1000 further includes a fixing member 400 that supports the mounting of the light emitting panel 200.

The display panel 100 is located in front of the light emitting panel 200, and the diffusion plate 300 is positioned between the display panel 100 and the light emitting panel 200. The diffusion plate 300 is spaced apart from the light emitting panel 200 at a predetermined distance to uniformly diffuse the light emitted from the light emitting panel 200 and provide the same to the display panel 100.

The display panel 100 includes a liquid crystal display panel or another light receiving display panel. Hereinafter, the case where a display panel is a liquid crystal display panel as an example is demonstrated.

The display panel 100 includes a TFT substrate 110 including a plurality of thin film transistors (TFTs), and a color filter substrate 120 disposed on the TFT substrate 110. Polarizers (not shown) are attached to the upper portion of the color filter substrate 120 and the lower portion of the TFT substrate 110 to polarize light passing through the display panel 100. A liquid crystal layer (not shown) is injected between the TFT substrate 110 and the color filter substrate 120.

The TFT substrate 110 is a transparent glass substrate on which a matrix thin film transistor is formed, a data line is connected to a source terminal, and a gate line is connected to a gate terminal. In the drain terminal, a pixel electrode made of a transparent conductive film as a conductive material is formed.

When electrical signals are input from the printed circuit boards 130 and 140 to the gate line and the data line, respectively, electrical signals are input to the gate terminal and the source terminal of the TFT. According to the input of these electrical signals, the TFT is turned on or turned off, and the electrical signals necessary for pixel formation are output to the drain terminal.

The color filter substrate 120 is a panel in which RGB pixels, which are color pixels in which a predetermined color is expressed while light passes, are formed by a thin film process, and a common electrode made of a transparent conductive film is coated on the entire surface thereof.

When power is applied to the gate terminal and the source terminal of the TFT and the thin film transistor is turned on, an electric field is formed between the pixel electrode and the common electrode of the color filter substrate 120. The arrangement angle of the liquid crystal injected between the TFT substrate 110 and the color filter substrate 120 is changed by the electric field, and the light transmittance is changed for each pixel according to the changed arrangement angle.

The printed circuit boards 130 and 140 of the display panel 100 are connected to gate lines and data lines through respective driving IC packages 1301 and 1401, respectively. To drive the display panel 100, the gate printed circuit board 130 generates a gate driving signal and transmits the gate driving signal to the gate line, and the data printed circuit board 140 generates a data driving signal and transmits the data driving signal to the data line.

The light emitting panel 200 is a surface emitting light source and emits light by exciting a fluorescent layer coated on a predetermined area. The light emitting panel 200 supplies light to the display panel 100 and can be driven for each light emitting pixel as indicated by a dotted line in FIG. 1. A plurality of gate lines (not shown) and a plurality of data lines (not shown) are formed in the light emitting panel 200, and they are connected to a printed circuit board (not shown) through the driving integrated circuit packages 201 and 202. The printed circuit board is positioned on the rear surface of the light emitting panel 200. The printed circuit board operates the light emitting panel 200 by applying driving signals to gate lines and data lines of the light emitting panel 200.

The light emitting panel 200 forms fewer pixels than the display panel 100 so that one pixel of the light emitting panel 200 corresponds to pixels of two or more display panels 100. Each pixel of the light emitting panel 200 may emit light corresponding to the highest gray level among the pixels of the display panel 100 corresponding thereto, and the light emitting panel 200 may express a gray level of 2 to 8 bits for each pixel. have. Since the light emitting panel 200 is dimmed and driven according to the image displayed on the display panel 100, the light and light panel 200 may adjust the contrast difference for each pixel. Therefore, the dynamic contrast ratio can be improved. The light emitting panel 200 will be described in detail later with reference to FIG. 4.

A front cover (not shown) and a rear cover (not shown) are positioned at the front of the display panel 100 and the rear of the light emitting panel 200, respectively. The front cover and the back cover are joined opposite to each other. As a result, internal components such as the display panel 100, the light emitting panel 200, and the diffusion plate 300 are accommodated therein. The light emitting panel 200 is accommodated after being mounted on a separate fixing member 400.

In general, when the light emitting panel is mounted on the fixing member, the fixing pin of the lower substrate of the light emitting panel and the fixing pin of the fixing member provided corresponding thereto are coupled to each other. Herein, a plurality of fixing pins are provided on the upper and lower portions of the light emitting panel. As a result, the load applied to the light emitting panel is concentrated on the lower substrate, particularly the fixing pin. As such, when the light emitting panel is locally subjected to force, the light emitting panel may be damaged.

On the other hand, in the present embodiment, since the fixing member 400 can be mounted while supporting the light emitting panel 200 efficiently, there is no possibility that the light emitting panel 200 will be damaged and the light emitting panel 200 can be well supported. Can be.

2 shows an exploded view of the fixing member 400 according to the present embodiment.

Referring to FIG. 2, the fixing member 400 includes a body portion 410, a fixing portion 420, and a support 430. The body portion has a plate shape to face one plate surface of the light emitting panel 400 (shown in FIG. 1), and supports one plate surface of the light emitting panel 400. And the fixing pin 4101 is formed on one side of the body portion 410.

The fixing part 420 supports one edge of the body part 410. Here, the fixing part 420 is located opposite to the fixing pin 411 formed on the body part 410. Although not shown in FIG. 2, the fixing part 420 may be coupled to the body part 410 using a screw or the like. To this end, the fixing part 420 has a concave space 421, and the body 410 is placed in the concave space 421. As a result, the fixing portion 420 wraps both corner portions of the body portion 410. The fixing part 420 is thicker than the thickness of the body part 410. As a result, the fixing part 420 supports the light emitting panel 200 (shown in FIG. 1) to be placed in front of the body part 410 while supporting the edge of the body part 410.

The support part 430 is located in the + y-axis direction of the fixing part 420. The support part 430 is coupled to the fixing part 420 and supports a part of the light emitting panel 200 which is not supported by the fixing part 420. The support part 430 includes a first support part 431 and a second support part 432, and the first support part 431 and the second support part 432 are integrally formed. The thickness of the first support part 431 is smaller than the thickness of the fixing part 420. Specifically, the first support part 431 is a sealing member 14 interposed between the first substrate 10 (shown in FIG. 3) and the second substrate 12 (shown in FIG. 3) of the light emitting panel 200. (Corresponding to the thickness in Fig. 3). The second support part 432 protrudes from the first support part 431 in the + y-axis direction. The thickness of the second support part 432 is greater than the thickness of the first support part 431 and smaller than the thickness of the fixing part 420.

The fixing part 420 and the support part 430 described above are coupled to each other. To this end, openings 4201 and 4311 are formed at positions corresponding to each other in the fixing part 420 and the first supporting part 431, respectively. The first support part 431 includes an extension part 4312 extending along the x axis direction and a protrusion part 4313 protruding toward the −z axis direction from the extension part 4312. Openings 4311 are formed at both ends of the extension part 4312 and the protrusion part 4313 based on the x-axis direction. The first support part 431 and the fixing part 420 are screwed through the opening 4311. Specifically, the extension portion 4312 and a portion surrounding both corner portions of the body portion 410 of the fixing portion 420 are screwed, and the central portion of the protrusion 4313 and the fixing portion 420 is screwed. However, the present exemplary embodiment is not limited thereto, and the method of coupling the first support part 431 and the fixing part 420 to each other may be variously modified.

A state in which the light emitting panel 200 is mounted on the fixing member 400 having the above-described structure will be described in more detail.

3 is a partial cross-sectional view taken along line III-III after mounting the light emitting panel 200 of FIG. 1 to the fixing member 420.

Referring to FIG. 3, one plate surface of the light emitting panel 200 is mounted to face the plate surface of the body portion 410. The fixing member 400 supports the light emitting panel 200 in the z-axis direction. The fixing part 420 of the fixing member 400 supports the first substrate 10 of the light emitting panel 200. The first support part 431 of the support part 430 supports the sealing member 14 between the first substrate 10 and the second substrate 12. In addition, the first support part 431 is positioned ahead of the first substrate 10 with respect to the y-axis direction. As a result, the first substrate 10 is fixed between the body portion 410 and the first support portion 431. The second support part 432 supports the second substrate 12. As described above, the light emitting panel 200 is fixed while the entire substrates 10 and 12 are supported by the fixing member 400. Therefore, the load applied by the light emitting panel 200 may be evenly distributed throughout the light emitting panel 200 to minimize the load. As a result, the light emitting panel 200 may be mounted on the body portion 410 with a more stable sense.

The light emitting panel 200 includes various electrons including field emission array (FEA) type, surface-conductive emission (SCE) type, metal-insulating layer-metal (MIM) type, and metal-insulating layer-semiconductor (MIS) type. It can be applied to an emissive display. In this embodiment, the field emission array (FEA) type light emitting panel 200 will be described in more detail.

4 is a partially exploded view of the light emitting panel 200 of FIG. 1.

Referring to FIG. 4, the light emitting panel 200 includes a first substrate 10, a second substrate 12, an electron emission unit 210, and a light emitting unit 220. The first substrate 10 and the second substrate 12 are disposed to face each other in parallel with a predetermined interval. And the 1st board | substrate 10 and the 2nd board | substrate 12 are joined by the sealing member 14 (shown in FIG. 3) arrange | positioned at the edge, and comprise the container which has an internal space. The vessel is evacuated to a vacuum of approximately 10 ⁻⁶ Torr to constitute a vacuum vessel consisting of the first substrate 10, the second substrate 12, and the sealing member.

The first substrate 10 opposite to the second substrate 12 is provided with an electron emission unit 210 in which an array of electron emitting elements is arranged, and the second substrate 12 opposite to the first substrate 10 is fluorescent. A light emitting unit 220 is provided that includes a layer 24, an anode electrode 26, and the like.

The cathode electrodes 16 are formed on the first substrate 10 in a stripe pattern along the y-axis direction. The first insulating layer 18 is formed on the first substrate 10 while covering the cathode electrodes 16. Gate electrodes 20 are formed on the first insulating layer 18 in a stripe pattern along the x-axis direction.

As a result, an intersection region of the cathode electrode 16 and the gate electrode 20 is formed, and the intersection region may constitute one pixel region of the light emitting panel 200. Electron emitters 22 are formed in each unit pixel on the cathode electrodes 16.

The electron emission unit 22 disposed in the above structure is made of materials emitting electrons when a electric field is applied in a vacuum, such as a carbon-based material or a nanometer (nm) size material. That is, the electron emission unit 22 is made of carbon nanotubes, graphite, graphite nanofibers, diamonds, diamond phase carbon, fullerene (C ₆₀ ), silicon nanowires, and combinations thereof. On the other hand, the electron emission portion may be formed of a tip structure having a pointed tip mainly made of molybdenum (Mo) or silicon (Si).

As shown in the enlarged source of FIG. 4, each of the first insulating layer 18 and the gate electrodes 20 has a first opening 181 and a second opening 201 corresponding to the electron emission section 22, respectively. Formed to expose the electron emission units 22 on the first substrate 10. That is, the electron emission part 22 is formed on the cathode electrode 16 and is exposed to the outside through the first opening 181 and the second opening 201. In the present embodiment, the electron emission portion 22 is shown in a cylindrical shape, but the shape thereof is not necessarily limited to the illustrated example.

Next, a fluorescent layer 24 is formed on one surface of the second substrate 12 facing the first substrate 10, and the fluorescent layer 24 may be formed of a white fluorescent layer. The fluorescent layer may be formed in the entire effective region of the second substrate 12 or may be formed in a predetermined pattern so that one white fluorescent layer is positioned in each unit pixel region.

On the other hand, the fluorescent layer may be composed of a combination of red, green and blue fluorescent layers, these fluorescent layers may be divided into a predetermined pattern in one pixel area. In FIG. 4, the white fluorescent layer 24 is positioned over the entire effective area of the second substrate 12.

An anode electrode 26 made of a metal such as aluminum (Al) is formed on the fluorescent layer 24. The anode electrode 26 receives a high voltage required for electron beam acceleration from the outside, for example, a voltage of 10 kV to 20 kV to maintain the fluorescent layer 24 in a high potential state. The anode electrode 26 reflects the visible light emitted toward the first substrate 10 among the visible light emitted from the fluorescent layer 24 toward the second substrate 12 to improve luminance. Here, the fluorescent layer 24 and the anode electrode 26 are sequentially stacked on the second substrate 12 so that the fluorescent layer 24 is adjacent to the second substrate 12. As a result, since the anode electrode 26 does not interfere with the light emitted from the fluorescent layer 24, the anode electrode 26 can be formed of an opaque metal having good electrical conductivity.

On the contrary, the fluorescent layer and the anode electrode may be stacked at different positions. That is, when the anode electrode is made of a transparent conductive film such as indium tin oxide (ITO), the transparent anode electrode may be positioned between the second substrate and the fluorescent layer. Moreover, the transparent conductive film mentioned above can be used as an anode electrode, and a metal film can also be further formed here.

A spacer 28 is disposed between the first substrate 10 and the second substrate 12 to maintain a constant gap between the two substrates 10 and 12 against the atmospheric pressure applied to the vacuum container. 4 shows one spacer 28.

5 is a schematic cross-sectional view taken along the line VV of FIG. 4.

Referring to FIG. 5, the above-described light emitting panel 200 forms a plurality of unit pixels by combining the cathode electrodes 16 and the gate electrodes 20, and a predetermined voltage is applied from the outside to the cathode electrodes 16. The gate electrodes 20 and the anode electrodes 26 are supplied and driven. For example, any one of the cathode electrodes 16 and the gate electrodes 20 receives a scan driving voltage to serve as scan electrodes, and the other electrodes receive a data driving voltage to serve as data electrodes. In addition, the anode electrode 26 receives a voltage required for electron beam acceleration, for example, a positive DC voltage of 10 kV to 20 kV.

Then, an electric field is formed around the electron emission unit 22 in the unit pixels in which the voltage difference between the cathode electrode 16 and the gate electrode 20 is greater than or equal to the threshold. As a result, electrons e- are emitted from the electron emission unit 22 as shown by the dotted line shown in FIG. 5. The emitted electrons (e−) are attracted by the high voltage applied to the anode electrode 26 and collide with the corresponding fluorescent layer 24 to emit light. Therefore, light is emitted from the light emitting panel 200.

The above-described light emitting panel 200 is driven at a lower power than the light emitting diode (LED) and the cold cathode fluorescent lamp (CCFL), and can independently control the light emission intensity of each pixel. Therefore, the dynamic contrast of the screen implemented in the display panel can be increased and sharper picture quality can be realized.

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.

A display device according to an embodiment of the present invention includes a fixing member for mounting a light emitting panel to support and fix the light emitting panel as a whole in the load direction. The light emitting panel mounted on the fixing member is accommodated together with the display panel and the diffusion plate. Therefore, the light emitting panel can be stably fixed, and the light emitting panel can be more stably supported by evenly distributing the load of the light emitting panel to the fixing member.

Claims (18)

An electron emitting light emitting panel adapted to emit light; A display panel positioned on the light emitting panel and configured to receive the light to display an image; And Fixing member for supporting the mounting of the light emitting panel Including, The fixing member, A body part supporting one plate surface of the light emitting panel to face one plate surface of the light emitting panel; And A fixing part having a thickness thicker than the body part and installed at one edge of the body part to support at least one edge of the light emitting panel. Display device comprising a. According to claim 1, And a support part extending in the same direction as the fixing part and extending to the fixing part in a direction perpendicular to the plate surface. The method of claim 2, The support portion, A first support part attached to the fixing part; And A second support portion attached to the first support portion in a direction perpendicular to the plate surface Display device comprising a. The method of claim 3, wherein The display device having a thickness less than that of the second support portion. The method of claim 3, wherein The thickness of the fixing portion is substantially equal to or larger than the thickness of the second support portion. The method of claim 3, wherein The light emitting panel includes a first substrate and a second substrate disposed to face each other, the fixing portion supports the first substrate, and the second support portion supports the second substrate. The method of claim 6, The light emitting panel further includes a sealing member disposed along edges of the first substrate and the second substrate between the first substrate and the second substrate, and the first support portion supports the sealing member. . The method of claim 7, wherein The display device of claim 1, wherein the first support portion protrudes more toward the light emitting panel than the fixing portion and the second support portion. The method of claim 6, The second support portion protrudes toward the light emitting panel side more than the fixing portion. The method of claim 9, The display device has a size smaller than that of the first substrate. The method of claim 3, wherein And a fixing portion surrounding the corner portions at both ends of one edge of the body portion. The method of claim 11, wherein The first support portion, An extension part extending along one edge of the light emitting panel; And A protrusion extending in a direction away from the light emitting panel from the center of the fixing portion and the extension portion; Display device comprising a. The method of claim 12, The display device is screwed to the protrusion and the fixed portion. The method of claim 12, And a portion of the fixing portion surrounding a corner portion of both edges of the body portion and the extension portion are screwed together. According to claim 1, The light emitting panel, A first substrate and a second substrate disposed to face each other; An electron emission unit provided on the first substrate; And Light emitting unit provided on the second substrate Display device comprising a. The method of claim 15, The electron emission unit, A cathode electrode formed on the first substrate; An electron emission unit adapted to be electrically connected to the cathode electrode; And A gate electrode electrically insulated from the cathode electrode Display device comprising a. The method of claim 15, The light emitting unit, A display device including a fluorescent layer and an anode electrode formed on the second substrate, a voltage of 10kV to 20kV is applied to the anode electrode. According to claim 1, The display panel is a liquid crystal display panel.

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