KR100759414B1 - Light emission device and liquid crystal display with the light emission device as backlight unit - Google Patents

Abstract

A light emission device and a liquid crystal display having the same as a backlight unit are provided to increase adhesive strength between a sealing member and a substrate and to suppress an increase of resistance of an extension by modifying shapes of first electrodes, second electrodes, and anode electrodes. A vacuum receptacle is formed with a first substrate(12), a second substrate, and a sealing member(16). A plurality of first electrodes(24) and a plurality of second electrodes are insulated from each other on the first substrate and are formed in an intersectional direction. The first electrodes and the second electrodes are positioned inside and outside the sealing member. A plurality of electron emission units are electrically connected to the first electrodes or the second electrodes. A light emitting unit is provided on one surface of the second substrate. The first electrodes or the second electrodes include extensions(243) for forming the maximum width of the corresponding electrodes at a position crossing the sealing member. The extension includes at least one opening(244) and satisfies the following condition W1>=W2 where W1 is the effective width of the extension which subtracts the width the opening from the width of the extension and W2 is the minimum width of the corresponding electrode including the extension.

Description

LIGHT EMISSION DEVICE AND LIQUID CRYSTAL DISPLAY WITH THE LIGHT EMISSION DEVICE AS BACKLIGHT UNIT}

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

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

3 is a plan view of a first substrate and first electrodes of a light emitting device according to an exemplary embodiment of the present invention.

4 is a partially enlarged view of FIG. 3.

5 is an enlarged cross-sectional view of an extension part and a sealing member of a first electrode of a light emitting device according to an exemplary embodiment of the present invention.

6 is a plan view of a first substrate and a second electrode of a light emitting device according to an exemplary embodiment of the present invention.

7 is a partially enlarged view of FIG. 6.

8 is a plan view of a second substrate and an anode electrode of a light emitting device according to an exemplary embodiment of the present invention.

9 is an exploded perspective view of a liquid crystal display according to an exemplary embodiment of the present invention.

10 is a block diagram of a configuration for driving a liquid crystal display according to an exemplary embodiment of the present invention.

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal display device, and more particularly, to a light emitting device that emits light using an electron emission characteristic by an electric field, and a liquid crystal display device using the light emitting device as a backlight unit.

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

Such a liquid crystal display basically includes a liquid crystal panel assembly and a backlight unit that provides light to the liquid crystal panel assembly, and the liquid crystal panel assembly receives light emitted from the backlight unit and transmits or blocks the light by the action of the liquid crystal layer. By implementing a predetermined image.

The backlight unit may be classified according to the type of light source, and one of them is a cold cathode fluorescent lamp (CCFL). Since the CCFL is a line light source, the light generated from the CCFL can be evenly distributed toward the liquid crystal panel assembly through the optical members 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.

As a conventional backlight unit, a light emitting diode (LED) method is known. 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 field emission type backlight unit that emits light using an electron emission characteristic by an electric field has been proposed as a backlight unit to replace the CCFL method and the LED method. The field emission type backlight unit is a surface light source, has the advantage of low power consumption, large size, and does not require a complicated optical member.

However, in the conventional field emission type backlight unit, since the sealing member disposed at the edges of the first substrate and the second substrate and constituting the vacuum container has low adhesive force with the electrode, the electrode crosses the sealing member inside the sealing member. When extending outward to form the electrode pad portion for voltage application, vacuum leakage may occur at the sealing member portion where the electrode crosses. Therefore, the conventional field emission type backlight unit is required to improve the structure to suppress the vacuum leakage.

As such, the conventional backlight unit has its own problems depending on the type of light source. In addition, the conventional backlight unit has a problem in that it is difficult to meet the image quality improvement required for the liquid crystal display device since the entire light emitting surface is driven to display a constant luminance when the liquid crystal display device is driven.

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

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

Accordingly, an object of the present invention is to solve the above problems, and an object of the present invention is to provide a light emitting device capable of suppressing vacuum leakage by increasing adhesion between an electrode and a sealing member, and a liquid crystal display using the light emitting device as a backlight unit. It is.

Another object of the present invention is to provide a light emitting device capable of dividing a light emitting surface into a plurality of regions and independently controlling the light intensity of each divided region, and a liquid crystal display capable of increasing the dynamic contrast ratio of a screen by using the light emitting apparatus as a backlight unit. To provide a device.

In order to achieve the above object, the present invention,

A vacuum container composed of a first substrate, a second substrate, and a sealing member, first electrodes formed on the first substrate in an insulated state and intersecting with each other and positioned over the inside and the outside of the sealing member; Second electrodes, electron emission parts electrically connected to ones of the first electrodes and the second electrodes, and a light emitting unit provided on one surface of the second substrate. Provided is a light emitting device comprising at least one of the two electrodes extending to form the maximum width of the electrode at a portion across the sealing member, the extension forms at least one opening and satisfies the following conditions .

Here, W1 represents the effective width of the expanded portion excluding the width of the opening from the expanded portion width, and W2 represents the minimum width of the corresponding electrode in which the expanded portion is formed.

Each of the first electrodes and the second electrodes may further include a main electrode part and an electrode pad part connected to an extension part and respectively positioned inside and outside the sealing member, and the main electrode part and the electrode pad part may be formed of the first electrode and the first electrode. The minimum width of the second electrode can be formed.

Each of the first electrodes and the second electrodes is divided into odd-numbered electrodes and even-numbered electrodes so that odd-numbered electrodes form an extension part and an electrode pad part at one edge of the first substrate, and even-numbered electrodes include a first electrode. An extension part and an electrode pad part may be formed at one edge of the opposite side of the substrate.

The light emitting unit includes a fluorescent layer formed on one surface of the second substrate, and an anode electrode formed on one surface of the fluorescent layer and positioned inside and outside the sealing member. The anode electrode includes an extension that forms at least one opening at a portion that crosses the sealing member, and the extension may form an effective width excluding the width of the opening beyond the minimum width of the anode electrode.

In addition, the present invention, in order to achieve the above object,

A liquid crystal panel assembly for forming a plurality of pixels along the row direction and a column direction, and a light emitting device for providing light to the liquid crystal panel assembly and forming a smaller number of pixels in the row direction and the column direction than the liquid crystal panel assembly, The light emitting device includes a vacuum container including a first substrate, a second substrate, and a sealing member, scan electrodes positioned in one of a row direction and a column direction on the first substrate, and a data electrode positioned in the other direction. And a fluorescent layer formed on one surface of the second substrate, and an anode electrode positioned on one surface of the fluorescent layer, scan electrodes and data electrodes are formed over the inside and outside of the sealing member, At least one of the data electrodes includes an extension that defines a maximum width of the electrode at a portion across the sealing member, the extension being an opening Provided is a liquid crystal display in which an effective width excluding a width is formed to be equal to or larger than a minimum width of a corresponding electrode.

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 partial cross-sectional view of a light emitting device according to an embodiment of the present invention, and FIG. 2 is a partially exploded perspective view showing an effective area of a light emitting device according to an embodiment of the present invention.

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

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

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

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

Among the first electrode 24 and the second electrode 26, an electrode mainly located in parallel with the row direction of the light emitting device 10 functions as a scan electrode and is positioned in parallel with the column direction of the light emitting device 10. It functions as a data electrode.

In the drawing, the electron emission part 28 is formed on the first electrode 24, the first electrodes 24 are positioned in parallel with the column direction (y-axis direction in the drawing) of the light emitting device 10, and the second The case where the electrodes 26 are positioned parallel to the row direction (x-axis direction in the drawing) of the light emitting device 10 is illustrated. The position of the electron emitter 28 and the arrangement directions of the first electrodes 24 and the second electrodes 26 are not limited to the above-described example and may be variously modified.

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

The electron emission unit 28 may be formed of materials emitting electrons when an electric field is applied, such as a carbon-based material or a nanometer-sized material. The electron emitter 28 may include, for example, carbon nanotubes, graphite, graphite nanofibers, diamonds, diamond-like carbons, C ₆₀ , silicon nanowires, or mixtures thereof. Chemical vapor deposition or sputtering may be applied.

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).

In the above structure, one intersection area of the first electrode 24 and the second electrode 26 corresponds to one pixel area of the light emitting device 10, or two or more crossing areas are one pixel area of the light emitting device 10. It can correspond to. In the second case, two or more first electrodes 24 and / or two or more second electrodes 26 positioned in one pixel area are 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 white fluorescent layer may be formed in the entire effective area of the second substrate 14 or may be divided and positioned in a predetermined pattern so that one white fluorescent layer is positioned in each pixel area. The red, green, and blue fluorescent layers are divided and positioned in a predetermined pattern in one pixel area. In the drawing, a case where the white fluorescent layer is positioned in the entire effective region of the second substrate 14 is illustrated.

The anode electrode 32 may be formed of a metal film such as aluminum 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 luminance of the light emitting surface.

In addition, spacers (not shown) 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 light emitting device 10 having the above-described configuration applies a predetermined driving voltage to the first electrodes 24 and the second electrodes 26 from the outside of the vacuum vessel, and the direct current amount of thousands of volts or more to the anode electrode 32. Drive by applying voltage.

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

3 is a plan view of a first substrate and first electrodes of a light emitting device according to an embodiment of the present invention, and FIG. 4 is a partially enlarged view of FIG. 3.

3 and 4, in the present exemplary embodiment, the first electrodes 24 have a predetermined width and a main electrode portion 241 positioned inside the sealing member 16, and a sealing member having a predetermined width. (16) It is located across the sealing member 16 between the electrode pad portion 242 located outside the main electrode portion 241 and the electrode pad portion 242, the main electrode portion 241 and the electrode pad portion ( 242 includes an extension 243 formed with a greater width.

The extension 243 defines one or more openings 244 therein to allow the sealing member 16 to contact the first substrate 12 through the opening 244. In the drawing, a plurality of openings 244 are formed in the extension part 243 along the width direction (x-axis direction of the drawing) of the main electrode part 241. The electrode pad part 242 may have the same width as the main electrode part 241, and is electrically connected to a driving circuit part (not shown) outside the vacuum container to receive the driving voltage of the first electrode 24. .

The first electrodes 24 are divided into odd-numbered and even-numbered electrodes so that the odd-numbered first electrodes 24 have an extension 243 and an electrode pad part 242 at one side of the first substrate 12. The even-numbered first electrodes 24 may be formed at the edge, and the extension part 243 and the electrode pad part 242 may be formed at one edge opposite to the first substrate 12. As a result, short circuits between the first electrodes 24 due to the extension part 243 may be effectively prevented while the electrode pitch of the main electrode parts 241 is kept small.

The sealing member 16 may be formed of a frit bar made by extruding a mixture of glass frit and an organic compound, or may have a structure in which an adhesive layer is formed of glass frit on the top and bottom of the glass bar. have. In both cases, the sealing member 16 is disposed between the first substrate 12 and the second substrate 14 and then the first substrate 12 and the second substrate are melted while the surface of the frit bar melts or the adhesive layer melts in the firing process. It is firmly bonded to the substrate 14.

Since the first substrate 12 made of glass is similar in composition to the sealing member 16, the vacuum hermeticity is increased at the contact area between the sealing member 16 and the first substrate 12. FIG. 5 is an enlarged cross-sectional view of the extension and the sealing member. The sealing member 16 bonded to the first substrate 12 and the second substrate 14 after firing may have openings 244 formed in the extension 243. In contact with the first substrate 12 through. Therefore, the adhesive force of the sealing member 16 to the first substrate 12 is increased at the portion where the first electrodes 24 cross the sealing member 16, and the vacuum leakage due to the weakening of the adhesive force may be minimized.

In addition, in the present embodiment, the first electrodes 24 are formed to satisfy the following conditions in order to suppress an increase in resistance due to the openings 244 provided in the extension 243.

Here, W1 denotes the effective width of the extension portion 243 excluding the width of the opening portions 244 in the extension portion 243 width W3 (see FIG. 4), and W2 denotes the minimum width of the first electrode 24 as the main width. The width W4 of the electrode part 241 and the electrode pad part 242 is shown.

As the effective width of the extension part 243 is formed to be equal to or greater than the minimum width of the first electrode 24, the driving voltage applied to the electrode pad part 242 passes through the extension part 243 and the main electrode part 241. ), There is no rise in resistance in the extension 243. As a result, the response speed of the light emitting device 10 may be increased, and the pulse wave distortion of the driving signal applied to the first electrode 24 may be minimized.

More preferably, the first electrode 24 forms the effective width of the extension portion 243 equal to the minimum width of the first electrode 24 so that the line resistance of the extension portion 243 is the electrode pad portion 242 and the main portion. It can be set equal to the line resistance of the electrode portion 241.

6 is a plan view of a first substrate and a second electrode of a light emitting device according to an embodiment of the present invention, and FIG. 7 is a partially enlarged view of FIG. 6.

6 and 7, in the present exemplary embodiment, the second electrodes 26 have a predetermined width and a main electrode portion 261 located inside the sealing member 16, and a sealing member having a predetermined width. (16) It is located across the sealing member 16 between the electrode pad portion 262 positioned outside the main electrode portion 261 and the electrode pad portion 262, and the main electrode portion 261 and the electrode pad portion ( 262 is formed to have a larger width than 262.

The extension 263 defines one or more openings 264 therein to allow the sealing member 16 to contact the first substrate 12 through the openings 264. In the drawing, a plurality of openings 264 are formed in the extension part 263 along the width direction (y-axis direction of the drawing) of the main electrode part 261.

In order to suppress the increase in resistance due to the openings 264 provided in the extension part 263, the second electrodes 26 may have the width of the extension part 263 excluding the width of the opening part 264. The effective width is formed equal to or greater than the minimum width of the second electrode 26. More preferably, the second electrode 26 forms the effective width of the extension 263 to be equal to the minimum width of the second electrode 26 so that the line resistance of the extension 263 is increased by the electrode pad part 262 and the main electrode. It can be set similarly to the line resistance of the electrode part 261.

Like the first electrodes 24, the second electrodes 26 are also divided into odd-numbered electrodes and even-numbered electrodes, so that the odd-numbered second electrodes 26 are extended parts 263 and electrode pad parts 262. Is formed at one edge of the first substrate 12, and the even-numbered second electrodes 26 may form the extension 263 and the electrode pad part 262 at one edge opposite to the first substrate 12. Can be. As a result, the short circuit between the second electrodes 26 caused by the expansion part 263 can be effectively prevented while keeping the electrode pitch of the main electrode parts 261 small.

8 is a plan view of a second substrate and an anode electrode of a light emitting device according to an exemplary embodiment of the present invention.

Referring to FIG. 8, in this embodiment, the anode electrode 32 is located in the main electrode portion 321 formed in the entire effective area of the second substrate 14 and the ineffective area of the second substrate 14. A connecting portion 322 having a width and extending from the main electrode portion 321, an extending portion 323 extending from the connecting portion 322 to cross the sealing member 16 and having a width greater than that of the connecting portion 322; The electrode pad part 324 extends from the extension part 323 and is positioned outside the sealing member 16.

The extension 323 defines one or more openings 325 therein to allow the sealing member 16 to contact the second substrate 14 through the openings 325. In the drawing, a plurality of openings 325 are formed in the extension part 323 along the width direction (y-axis direction of the drawing) of the connection part 322. The electrode pad part 324 may be formed to have the same width as the connection part 322, and the connection part 322 and the electrode pad part 324 may be provided in pairs at one edge of the second substrate 14.

The anode electrode 32 also has an effective width of the extension 323 except for the width of the openings 325 in the width of the extension 323 in order to suppress an increase in resistance due to the openings 325 provided in the extension 323. Is equal to or greater than the minimum width of the anode electrode 32. The minimum width of the anode electrode 32 may be defined as the width of the connection part 322 and the electrode pad part 324. More preferably, the anode electrode 32 forms the effective width of the extension 323 to be the same as the minimum width of the anode electrode 32 so that the line resistance of the extension 323 is defined by the electrode pad part 324 and the connection part ( It can be set equal to the line resistance of 322.

Meanwhile, in the above-described embodiment, the first substrate 12 and the second substrate 14 may be positioned at a larger interval, for example, 5 to 20 mm, than the conventional field emission backlight unit. 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 electrode pad part 324. 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.

9 is an exploded perspective view of a liquid crystal display according to an exemplary embodiment in which the light emitting device having the above-described configuration is used as a backlight unit.

Referring to FIG. 9, the liquid crystal display device 40 according to the present exemplary embodiment includes a liquid crystal panel assembly 42 having arbitrary pixels in a row direction and a column direction, and is positioned behind the liquid crystal panel assembly 42 to provide a liquid crystal panel assembly ( 42 to a light emitting device 10 that provides light. Any known liquid crystal panel assembly may be applied to the liquid crystal panel assembly 42, and the light emitting device 10 of the above-described embodiment functions as a backlight unit.

An optical member (not shown) such as a diffusion plate or a diffusion sheet may be disposed between the liquid crystal panel assembly 42 and the light emitting device 10 as necessary.

The row direction may be defined as one direction of the liquid crystal display 40, for example, a horizontal direction (x-axis direction in the drawing) of the screen implemented by the liquid crystal panel assembly 42, and the column direction may be defined as the liquid crystal display 40. ) May be defined as a vertical direction (y-axis direction of the drawing) of the screen implemented by the liquid crystal panel assembly 42.

In particular, in the present embodiment, the light emitting device 10 forms a smaller number of pixels than the liquid crystal panel assembly 42 along the row direction and the column direction so that one pixel of the light emitting device 10 includes a plurality of pixels of the liquid crystal panel assembly 42. To respond to them.

When the number of pixels of the liquid crystal panel assembly 42 in the row direction and the number of pixels of the liquid crystal panel assembly 42 in the column direction are M and N, respectively, M and N may be defined as an integer of 240 or more. If the number of pixels of the light emitting device 10 in the row direction and the number of pixels of the light emitting device 10 in the column direction are M 'and N', respectively, M 'and N' are any integer of 2 to 99. Can be defined as

The light emitting device 10 is a kind of self-luminous display panel having a resolution of M '× N', and the light emission intensity is independently controlled for each pixel to provide light of an appropriate intensity to the pixels of the liquid crystal panel assembly 42 corresponding to each pixel. to provide.

In this case, 2, which is the minimum value of M 'and N', is the minimum basic condition under which the light emitting device 10 of the present exemplary embodiment may be a display panel. If the resolution of the light emitting device exceeds 99 × 99, the driving of the light emitting device can be complicated, and the cost for manufacturing the driving circuit can be increased. Therefore, 99, which is the maximum value of M 'and N', indicates the functionality and ease of manufacture of the light emitting device. This can be referred to as a number.

10 is a block diagram of a configuration for driving a liquid crystal display according to an exemplary embodiment of the present invention.

Referring to FIG. 10, the liquid crystal display of the present exemplary embodiment includes a liquid crystal panel assembly 42, a first scan driver 102 and a first data driver 104 connected to the liquid crystal panel assembly 42, and a first data driver. A gray voltage generator 106 connected to the 104, a light emitting device 10, and a signal controller 108 for controlling the gray voltage generator 106 are included.

The liquid crystal panel assembly 42 includes a plurality of signal lines S ₁ -S _n , D ₁ -D _m , and a plurality of first pixels PX connected to the signal lines and arranged in an approximately matrix form in an equivalent circuit. It includes. The signal lines S ₁ -S _n and D ₁ -D _m are a plurality of first scan lines S ₁ -S _n which transmit a first scan signal, and a plurality of first data lines which transfer a first data signal. (D ₁ -D _m ).

Each of the pixels (PX), for instance the i-th (i = 1,2, ... n) first scan line (S _i) and the j-th (j = 1,2, ... m) the first data line the pixel 44 is connected to the (D _j) comprises a switching element (Q) and the liquid crystal capacitors (Clc) and a storage capacitor (Cst) connected thereto is connected to the signal line (S _i, D _j). Holding capacitor Cst can be omitted as needed.

A switching element (Q) is a three-terminal element such as thin film transistors included in liquid crystal panel assembly 42, a lower substrate (not shown), the control terminal is connected to the first gate line (S _i), the input terminal Is connected to the first data line D _j , and the output terminal is connected to the liquid crystal capacitor Clc and the storage capacitor Cst.

The gray voltage generator 106 generates two sets of gray voltage sets (or reference gray voltage sets) related to the transmittance of the first pixel PX. One of the two sets has a positive value for the common voltage (Vcom) and the other set has a negative value.

The first scan driver 102 is connected to the first scan lines S ₁ -S _n of the liquid crystal panel assembly 42 to form a first scan signal formed by a combination of a switch on voltage Von and a switch off voltage Voff. Is applied to the first scan lines S ₁ -S _n .

The first data driver 104 is connected to the first data lines D ₁ -D _m of the liquid crystal panel assembly 42 and selects a gray voltage from the gray voltage generator 106 and uses the first data as a data signal. Apply to lines D ₁ -D _m . However, when the gray voltage generator 106 provides only a predetermined number of reference gray voltages instead of providing all of the voltages for all grays, the first data driver 104 divides the reference gray voltages to provide total gray levels. A gray voltage is generated and a data signal is selected from among them.

The signal controller 108 controls the first scan driver 102 and the first data driver 104 and includes a light emitting device controller 110 for controlling the light emitting device 10. The light emitting device controller 110 controls the second scan driver 114 and the second data driver 112 of the light emitting device 10. The signal controller receives the input image signals R, G, and B and an input control signal for controlling the display thereof from an external graphic controller (not shown).

The input image signals R, G, and B contain luminance information of each first pixel PX, and the luminance is a predetermined number, for example, 1024 (= 2 ¹⁰ ), 256 (= 2 ⁸ ), or It has 64 (= 2 ⁶ ) grays. Examples of the input control signal include a vertical sync signal Vsync, a horizontal sync signal Hsync, a main clock MCLK, and a data enable signal DE.

The signal controller 108 properly processes the input image signals R, G, and B based on the input image signals R, G, and B and the input control signal, according to operating conditions of the liquid crystal panel assembly 42. After generating the scan driver control signal CONT1 and the first data driver control signal CONT2, etc., the first scan driver control signal CONT1 is sent to the first scan driver 102, and the first data driver control signal ( CONT2) and the processed video signal DAT are sent to the first data driver 104.

The display unit 116 of the light emitting device 10 includes a plurality of second pixels EPX, and each of the second pixels EPX includes one second scan line S ′ ₁ -S ′ _p and one agent. 2 is connected to the data lines C ₁ -C _q . Each second pixel EPX emits light according to a voltage difference applied to the second scan line S ′ ₁ -S ′ _p and the second data line C ₁ -C _q . The second scan lines S ′ ₁ -S ′ _p correspond to electrodes positioned along the row direction of the light emitting device 10, and the second data lines C ₁ -C _q correspond to the column directions of the light emitting devices. Corresponding to the electrodes positioned along.

The signal controller 108 uses the input image signals R, G, and B for the plurality of first pixels PX corresponding to one second pixel EPX of the light emitting device 10 to emit light. Generates a light emission control signal. The emission control signal includes a second data driver control signal CD, an emission signal CLS, and a second scan driver control signal CS. According to the second data driver control signal CD, the light emission signal CLS, and the second scan driver control signal CS, each of the second pixels EPX of the light emitting device 10 includes a plurality of first pixels PX. In response to the light emission.

In detail, the signal controller 108 inputs a plurality of first pixels PX (hereinafter, referred to as a 'first pixel group') corresponding to one second pixel EPX of the light emitting device 10. The highest gray level among the first pixels PX of the first pixel group is detected using the image signals R, G, and B, and transmitted to the light emitting device controller 110. The light emitting device controller 110 calculates the grayscale required to emit the second pixel EPX according to the detected grayscale, converts the grayscale to digital data, and transmits the grayscale to the second data driver 112.

In the present exemplary embodiment, the light emission signal CLS includes 6-bit or more digital data for gray scale representation of the second pixel EPX. The second data driver control signal CD allows each second pixel EPX to emit light in synchronization with the first pixel group corresponding to the second pixel EPX. That is, the second pixel EPX is synchronized to emit light with a predetermined gray scale in accordance with the display of the image in the first pixel group corresponding to one second pixel EPX.

The second data driver 112 generates a second data signal according to the second data driver control signal CD and the emission signal CLS and applies the second data signal to each second data line C ₁ -C _q .

In addition, the light emitting device controller 110 generates the second scan driver control signal CS of the light emitting device 10 by using the horizontal synchronization signal Hsync. That is, the second scan driver 114 is connected to the second scan line S ′ ₁ -S ′ _p , generates a second scan signal according to the second scan driver control signal CS, and generates a second scan. Pass on lines S ' _1- S' _p . While the switch-on voltage Von is applied to the first pixel group corresponding to one second pixel EPX of the light emitting device 10, the second scan line S ′ ₁ -S ′ of the second pixel EPX. _p ) is applied with a second scan signal.

Then, the second pixel EPX emits light corresponding to the gray level of the corresponding first pixel group by the second scan voltage and the second data voltage. In the present embodiment, a voltage according to the gray level is applied to the second data lines C ₁ -C _q of the second pixel EPX, and a constant amount of voltage is applied to the second scan lines S ′ ₁ -S ′ _p . The second pixel EPX emits light due to a voltage difference between two lines.

The liquid crystal display 40 according to the present exemplary embodiment may improve the dynamic contrast of the screen through the above-described process, and may 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.

The light emitting device according to the present invention can enhance the adhesion between the sealing member and the substrate by suppressing the shape of the first electrodes, the second electrodes and the anode electrode described above, and can suppress the increase in the resistance of the extension part. Therefore, the light emitting device according to the present invention can minimize the vacuum leakage of the sealing member to ensure high vacuum, increase the response speed, and suppress the pulse wave distortion of the driving signal.

In addition, the liquid crystal display according to the present invention using the above-described light emitting device as a backlight unit 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 backlight unit, 30 inches or more It can be easily manufactured in a large display device.

Claims (14)

A vacuum container composed of a first substrate, a second substrate, and a sealing member; First and second electrodes formed on the first substrate in an insulated state and intersecting with each other, and positioned over an inner side and an outer side of the sealing member; Electron emission parts electrically connected to any one of the first electrodes and the second electrodes; And A light emitting unit provided on one surface of the second substrate, At least one of the first electrodes and the second electrodes includes an extension configured to form a maximum width of the electrodes at a portion crossing the sealing member; A light emitting device in which the extension forms at least one opening and satisfies the following conditions.

Here, W1 represents the effective width of the extension except the opening width from the extension width, and W2 represents the minimum width of the electrode in which the extension is formed. The method of claim 1, The first electrode further includes a main electrode portion and an electrode pad portion which are respectively located inside and outside the sealing member while being connected to the extension portion. Wherein the main electrode portion and the electrode pad portion form a minimum width of the first electrode. The method according to claim 1 or 2, The second electrode further includes a main electrode portion and an electrode pad portion which are respectively located inside and outside the sealing member while being connected to the extension portion. Wherein the main electrode portion and the electrode pad portion form a minimum width of the second electrode. The method of claim 2, The first electrodes are divided into odd-numbered and even-numbered electrodes so that odd-numbered electrodes form the extension part and the electrode pad part at one edge of the first substrate, and even-numbered electrodes are opposite to the first substrate. The light emitting device to form the expansion portion and the electrode pad portion at the edge. The method of claim 3, The second electrodes are divided into odd-numbered and even-numbered electrodes so that odd-numbered electrodes form the extension part and the electrode pad part at one edge of the first substrate, and even-numbered electrodes are opposite to the first substrate. The light emitting device to form the expansion portion and the electrode pad portion at the edge. The method of claim 1, The light emitting unit includes a fluorescent layer formed on one surface of the second substrate and an anode electrode formed on one surface of the fluorescent layer and positioned inside and outside the sealing member, And an expansion portion forming at least one opening at a portion where the anode electrode crosses the sealing member, wherein the expansion portion satisfies the following conditions.

Here, W1 'represents the effective width of the expanded portion excluding the opening width from the expanded portion width, and W2' represents the minimum width of the anode electrode. The method of claim 6, The second substrate includes an effective area and an invalid area inside the sealing member, A main electrode part in which the anode electrode is located in the entire effective area, a connection part located in the ineffective area and connecting the main electrode part and the extension part, and an electrode pad located outside the sealing member and connected to the extension part; Further includes wealth, And the connection portion and the electrode pad portion form a minimum width of the anode electrode. The method of claim 7, wherein The light emitting device of claim 1, wherein the connection part and the electrode pad part are provided at one edge of the second substrate. A vacuum container composed of a first substrate, a second substrate, and a sealing member; First and second electrodes formed on the first substrate in an insulated state and intersecting with each other, and positioned over an inner side and an outer side of the sealing member; Electron emission parts electrically connected to ones of the first electrodes and the second electrodes; A fluorescent layer formed on one surface of the second substrate; And An anode electrode formed on one surface of the fluorescent layer and positioned over an inner side and an outer side of the sealing member; At least one of the first electrodes and the second electrodes includes an extension having a maximum width among the electrodes at a portion crossing the sealing member, the extension forming at least one opening; An effective width excluding the width is formed at least the minimum width of the corresponding electrode, And an extension configured to form at least one opening at a portion where the anode electrode crosses the sealing member, wherein the extension forms an effective width excluding the width of the opening to be equal to or greater than the minimum width of the anode electrode. A liquid crystal panel assembly forming a plurality of pixels along the row direction and the column direction; And A light emitting device for providing light to the liquid crystal panel assembly and forming a smaller number of pixels in the row direction and the column direction than the liquid crystal panel assembly, The light emitting device, A vacuum container composed of a first substrate, a second substrate, and a sealing member; An electron emission unit having scan electrodes positioned in one of the row direction and the column direction on the first substrate and data electrodes positioned in the other direction; A light emitting unit including a fluorescent layer formed on one surface of the second substrate and an anode electrode located on one surface of the fluorescent layer, The scan electrodes and the data electrodes are formed on an inner side and an outer side of the sealing member, At least one of the scan electrodes and the data electrodes includes an extension configured to form a maximum width of the corresponding electrode at a portion crossing the sealing member, and the extension includes an effective width excluding the width of the opening; Liquid crystal display device formed more than the width. The method of claim 10, The scan electrodes may further include a main electrode portion and an electrode pad portion respectively connected to the expansion portion and positioned inside and outside the sealing member. And the main electrode portion and the electrode pad portion form a minimum width of the scan electrode. The method of claim 10, The data electrodes may further include a main electrode part and an electrode pad part respectively connected to the expansion part and positioned inside and outside the sealing member. And the main electrode portion and the electrode pad portion form a minimum width of the data electrode. The method according to any one of claims 10 to 12, Wherein the anode electrode extends inside and outside the sealing member and includes an extension that forms at least one opening at a portion across the sealing member, the extension having an effective width excluding the width of the opening, the minimum width of the anode electrode; The liquid crystal display device formed above. The method of claim 10, And a number of pixels of the light emitting device along the row direction and a number of pixels of the light emitting device along the column direction are any one of 2 to 99.

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