KR100415607B1 - Field Emission Display - Google Patents

Abstract

The present invention relates to a field emission display device capable of preventing a short circuit of an electrode due to an overcurrent.

The field emission display device of the present invention includes an anode electrode formed on the upper substrate; An anode driver for supplying a driving voltage to the anode electrode; A connection part for receiving a driving voltage from the anode driver; A neck portion for electrically connecting the connection portion and the anode electrode; A connection line for electrically connecting the connection portion and the anode drive portion; Connections, necks and connections in a larger area than connections, necks and connection lines to provide an area where overcurrents can flow to the connections, necks and connection lines to prevent damage to the connections, necks and connection lines. A conductive thin film tape installed to cover the line; It is provided with a clip member for stably connecting the connection line and the connecting portion and to provide an area through which overcurrent can flow.

Description

Field emission display device {Field Emission Display}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a field emission display device, and more particularly, to a field emission display device capable of preventing a short circuit of an electrode due to an overcurrent.

Recently, various flat panel displays have been developed to reduce weight and volume, which are disadvantages of cathode ray tubes (CRTs). Such flat panel displays include liquid crystal displays (hereinafter referred to as "LCDs"), field emission displays (hereinafter referred to as "FEDs"), plasma display panels, and electroluminescence. Sense (Electro-Luminescence: "EL"). In order to improve the display quality, research and development for increasing the brightness, contrast and color purity of flat panel displays have been actively conducted.

The dual FED is a tip type FED that concentrates a high field on a sharp cathode (emitter) and emits electrons by a quantum mechanical tunnel effect, and a quantum mechanical tunnel by focusing a high field on a metal having a predetermined area. It is divided into planar (Metal Insulator Metal: MIM) FED which emits electrons by Tunnel effect.

1 and 2 show a conventional tip type field emission display device.

1 and 2, an FED having an upper glass substrate 2 on which an anode electrode 4 and a phosphor 6 are stacked, and a field emission array 32 formed on the lower glass substrate 8. Is shown. The field emission array 32 includes the cathode electrode 10 and the resistive layer 12 formed on the lower glass substrate 8, and the gate insulating layer 14 and the emitter 22 formed on the resistive layer 12. ) And a gate electrode 16 formed on the gate insulating layer 14.

The cathode electrode 10 supplies a current to the emitter 22, and the resistive layer 12 limits the overcurrent applied from the cathode electrode 10 toward the emitter 22, thereby making it uniform to the emitter 22. It serves to supply current.

The gate insulating layer 14 insulates between the cathode electrode 10 and the gate electrode 16. The gate electrode 16 is used as an extraction electrode for drawing electrons. A spacer 40 is installed between the upper glass substrate 2 and the lower glass substrate 8.

The spacer 40 supports the upper glass substrate 2 and the lower glass substrate 8 so as to maintain a high vacuum state between the upper glass substrate 2 and the lower glass substrate 8.

In order to display an image, a negative (-) cathode voltage is applied to the cathode electrode 10 and a positive (+) anode voltage having several voltages is applied to the anode electrode 4. The gate voltage of positive polarity (+) is applied to the gate electrode 16. Then, the electron beam 30 emitted from the emitter 22 collides with the red, green, and blue phosphors 6 to excite the phosphors 6. At this time, visible light of any one of red, green, and blue colors is emitted according to the phosphor 6. The anode electrode 4 is formed of a thin film to transmit visible light generated from the phosphor 6.

3 is a diagram illustrating a pixel cell of a conventional planar field emission display device.

Referring to FIG. 3, a pixel cell of a conventional planar field emission display device includes an upper substrate 42 having an anode electrode 44 and a phosphor 46 stacked thereon, and a field emission array formed on the lower substrate 48. 56).

The field emission array 56 includes a scan electrode 50, an insulating layer 52, and a data electrode 54 formed on the lower substrate 48.

In order to display an image, a negative scan pulse is applied to the scan electrode 50 and a positive data pulse is applied to the data electrode 54. Then, a positive anode voltage having several voltages is applied to the anode electrode 44. Then, electrons are tunneled from the scan electrode 50 to the data electrode 54 and accelerated toward the anode electrode 44.

These electrons collide with the red, green and blue phosphors 46 to excite the phosphors 46. At this time, visible light of any one of red, green, and blue colors is generated according to the phosphor 46. The anode 44 is formed of a thin film to transmit visible light generated from the phosphor 46.

4 is a plan view illustrating the field emission display device illustrated in FIGS. 1 and 3.

Referring to FIG. 4, the field emission display device includes first and second data pads 62A and 62B for receiving a driving voltage from a data driver not shown, and a scan for receiving a driving voltage from a scan driver not shown. A pad 64 and an anode driver 70 for supplying a driving voltage to the anode electrodes 4 and 44 are provided.

The first and second data pads 62A and 62B receive a driving voltage from the data driver and supply them to the data electrodes 16 and 54. The scan pad 64 receives a driving voltage from the scan driver and supplies the scan electrodes 10 and 50 to the scan electrodes 10 and 50.

The anode electrodes 4 and 44 are formed in the effective display portion 60 of the upper substrates 2 and 42. The anode driver 70 supplies several kilowatts of high voltage to the connecting portion 68. The connecting portion 68 is electrically connected to the anode electrodes 4 and 44 via the neck portion 66. The connecting portion 68, the neck portion 66, and the anode electrodes 4, 44 are formed of a thin film.

When driving the field emission display device, arcing is generated by charges accumulated in the spacer 40. When arcing occurs, instantaneous overcurrent flows through the anode electrodes 4 and 44. Due to such an overcurrent, the neck portion 66 formed of a thin thin film is shorted, or the surfaces of the neck portion 66 and the connecting portion 68 are raised convexly. If the neck portion 66 is short-circuited or the surfaces of the neck portion 66 and the connecting portion 68 are raised convexly, no voltage is supplied to the anode electrodes 4 and 44, and the operation of the field emission display device becomes impossible.

Accordingly, an object of the present invention is to provide a field emission display device capable of preventing a short circuit of an electrode due to overcurrent.

1 is a perspective view showing a conventional tip type field emission display device.

2 is a cross-sectional view showing a conventional tip type field emission display device.

3 is a view showing pixel cells of a conventional planar field emission display device.

4 is a plan view of the field emission display device illustrated in FIGS. 1 and 3.

5 is a view showing a field emission display device according to a first embodiment of the present invention.

6 is a view showing a field emission display device according to a second embodiment of the present invention.

7A and 7B show a field emission display device according to a third embodiment of the present invention.

<Description of Symbols for Main Parts of Drawings>

2,42,72: upper substrate 4,44,92: anode electrode

6,46: phosphor 8,48,74: lower substrate

10 cathode electrode 12 resistive layer

14 gate insulating layer 16 gate electrode

22 emitter 30 electron beam

32,56: field emission array 40: spacer

50 scanning electrode 52 insulating layer

54: data electrode 60,88: effective display unit

62A, 62B, 76A, 76B: Data pad 64, 78: Scan pad

66,80 neck portion 68,82 connection portion

70, 90 anode drive 84 conductive thin film tape

86: connection line 94: conductive metal

96: conductive paste

In order to achieve the above object, the field emission display device includes: an anode formed on an upper substrate; An anode driver for supplying a driving voltage to the anode electrode; A connection part for receiving a driving voltage from the anode driver; A neck portion for electrically connecting the connection portion and the anode electrode; A connection line for electrically connecting the connection portion and the anode drive portion; Connections, necks and connections in a larger area than connections, necks and connection lines to provide an area where overcurrents can flow to the connections, necks and connection lines to prevent damage to the connections, necks and connection lines. A conductive thin film tape installed to cover the line; It is provided with a clip member for stably connecting the connection line and the connecting portion and to provide an area through which overcurrent can flow.

Other objects and features of the present invention in addition to the above objects will become apparent from the description of the embodiments with reference to the accompanying drawings.

Hereinafter, exemplary embodiments of the present invention will be described with reference to FIGS. 5 to 7B.

5 is a plan view illustrating a field emission display device according to a first exemplary embodiment of the present invention.

Referring to FIG. 5, the field emission display device according to the first embodiment of the present invention faces the upper substrate 74, the anode electrode 92 formed on the upper substrate 74, and the upper substrate 74. The lower substrate 72, the first and second data pads 76A and 76B formed on the lower substrate 72 to receive a driving voltage from a data driver not shown, and the lower substrate 72. And a scan pad 78 for supplying a driving voltage from a scan driver not shown and an anode driver 90 for supplying a driving voltage to the anode electrode 92.

The first and second data pads 76A and 76B relay the drive voltage supplied from the data driver to a data electrode (not shown). The scan pad 78 relays the driving voltage supplied from the scan driver to a scan electrode (not shown).

The anode electrode 92 is formed in the effective display portion 88 of the upper substrate 74. One side of the anode electrode 92 is formed with a connection portion 82 for receiving a driving voltage. The connecting portion 82 is electrically connected to the anode electrode 92 through the neck portion 80. The anode drive unit 90 is electrically connected to the connection unit 82 through the connection line 86.

The conductive thin film tape 84 is provided on the neck portion 80, the connection portion 82, and the connection line 86. The conductive thin film tape 84 is provided to cover the neck portion 80 formed at the portion where the upper substrate 74 and the lower substrate 72 do not overlap. In addition, the conductive thin film tape 84 is provided to cover the connection portion 82 and is installed to cover a predetermined portion of the connection line 86.

The conductive thin film tape 84 prevents the short circuit and the surface of the neck portion 80 and the connecting portion 82 from convexly occurring when an instantaneous overcurrent flows through the anode electrode 92. In other words, the conductive thin film tape 84 provides an area through which overcurrent can flow.

6 is a plan view illustrating a field emission display device according to a second exemplary embodiment of the present invention.

Referring to FIG. 6, in the field emission display device according to the second embodiment of the present invention, a conductive metal 94 (eg, a nal clip) is provided on the conductive thin film tape 84. The conductive metal 94 provides a contact force so that the connection line 86 and the connection portion 82 can be in strong contact, and also provide an area through which an overcurrent can flow. If the connection line 86 and the connection portion 82 are in strong contact by the conductive metal 94, the contact resistance is minimized.

7A and 7B are plan views illustrating a field emission display device according to a third exemplary embodiment of the present invention.

7A and 7B, the field emission display device according to the third embodiment of the present invention applies a conductive paste 96 on the conductive metal 94 and the neck portion 80. The conductive paste 96 makes a strong contact between the conductive metal 94 and the neck portion 80. Therefore, the contact resistance between the conductive metal 94 and the neck portion 80 is minimized by the conductive paste 96. As described above, in the present invention, the short circuit of the neck portion can be prevented by the overcurrent by providing a width and a thickness through which the overcurrent can flow.

Meanwhile, in embodiments of the present invention, a resistor having a resistance value between 1 kV and 10 kV may be additionally provided between the anode driver 90 and the connecting unit 82. If a few mega resistors are installed between the anode driver 90 and the connection 82, the amount of overcurrent generated by arcing can be minimized.

As described above, according to the field emission display device according to the present invention, the conductive thin film tape, the conductive metal, and the conductive face are provided at the connection portion between the anode driving portion and the anode electrode. In addition, a resistor is further provided between the anode driver and the anode electrode. Therefore, by providing a width and thickness through which the overcurrent generated by the arcing of the field emission display element can sufficiently flow, it is possible to prevent the short circuit of the anode electrode and the surface of the anode electrode from convexly occurring.

Those skilled in the art will appreciate that various changes and modifications can be made without departing from the technical spirit of the present invention. Therefore, the technical scope of the present invention should not be limited to the contents described in the detailed description of the specification but should be defined by the claims.

Claims (6)

A field emission display device comprising an upper substrate and a lower substrate opposed to the upper substrate by a predetermined portion; An anode electrode formed on the upper substrate; An anode driver for supplying a driving voltage to the anode electrode; A connection part for receiving the driving voltage from the anode driver; A neck portion for electrically connecting the connection portion and the anode electrode; A connection line for electrically connecting the connection portion and the anode driver; In order to prevent the connection part, the neck part, and the connection line from being damaged by over current, the connection part has a larger area than the connection part, the neck part, and the connection line to provide an area through which the overcurrent can flow. A conductive thin film tape installed to cover the neck portion and the connection line; And a clip member for stably connecting the connection line and the connection part and providing an area through which the overcurrent can flow. The method of claim 1, The conductive thin film tape is formed on a portion where the upper substrate and the lower substrate do not overlap. delete delete The method of claim 1, And a conductive paste for strongly contacting the clip member and the neck portion on the clip member and the neck portion. The method of claim 1, And a resistor having a resistance value between 1 kV and 10 kV between the anode driver and the connecting portion.