KR20060095720A - Electron emission display apparatus wherein output electric potential of data driver varies - Google Patents

Abstract

The electron emission display device according to the present invention includes electron emission sources, data electrode lines, scan electrode lines, fluorescent cells, and a bipolar plate. Scan electrode lines are formed to intersect the data electrode lines. In the positive plate, a potential is applied so that electrons from the electron emission sources move to the fluorescent cells. The output potential of the data driver for driving the data electrode lines in each horizontal driving period is output for a time proportional to the gradation of each of the data electrode lines. Here, the output potential of the data driver portion is repeatedly changed in synchronization with each horizontal driving period.

Description

Electromagnetic emission display apparatus wherein output electric potential of data driver varies}

1 is a block diagram showing the configuration of an electron emission display device according to an embodiment of the present invention.

FIG. 2 is an exploded perspective view illustrating the electron emission display panel of FIG. 1. FIG.

3 is a timing diagram illustrating driving signals applied to the gate electrode lines, the focusing electrode plate, and the cathode electrode lines of FIG. 2.

4 is a timing diagram illustrating an example of data pulses for the scan pulses of FIG. 3.

<Explanation of symbols for the main parts of the drawings>

1 ... electron emission display panel, 2 ... front panel,

21 the front substrate, 22 the positive plate,

F _R11 , ..., F _Bnm ... fluorescent cells, 3 ... rear panel,

31 ... rear substrate, C _R1 , ..., C _Bm ... cathode electrode lines,

E _R11 , ..., E _Bnm ... electron emitters, 33 ... first insulating layer,

G ₁ , ..., G _n ... gate electrode lines, 35 ... second insulating layer,

36 ... focusing electrode plate, H _R11 , ..., H _Bnm ... through holes,

41, ..., 43 ... space bars.

TECHNICAL FIELD The present invention relates to an electron emission display device, and more particularly, to an electron emission display device including electron emission sources, data electrode lines, scan electrode lines, fluorescent cells, and a bipolar plate.

Prior art related to an electron emission display device is US Patent Application Publication No. 122,118 (FED driving method) in 2003.

Such conventional electron emission display devices basically include electron emission sources, data electrode lines, scan electrode lines, fluorescent cells, and a bipolar plate. The scan electrode lines are formed to intersect the data electrode lines. An electric potential is applied to the positive electrode plate so that electrons from electron emission sources move to the fluorescent cells.

The horizontal drive period includes the blanking time and the horizontal display time. Scan pulses with a width of each horizontal display time are sequentially applied to the scan electrode lines. Data pulses are applied to the data electrode lines corresponding to the scan pulses. More specifically, the constant output potential of the data driver for driving the data electrode lines in each horizontal driving period is output for a time proportional to the gradation of each of the data electrode lines.

In the conventional electron emission display device as described above, in order to solve a problem of low gradation expression ability, for example, a problem that a user cannot identify a subject in a dark background image, data of low gradation is appropriately set to high gradation of data. The work needed to change.

SUMMARY OF THE INVENTION An object of the present invention is to provide an electron emission display device capable of solving the problem of low gradation expression capability without changing image data.

The electron emission display device of the present invention for achieving the above object includes electron emission sources, data electrode lines, scan electrode lines, fluorescent cells, and a bipolar plate. The scan electrode lines are formed to intersect the data electrode lines. To the bipolar plate, a potential is applied so that electrons from the electron emission sources move to the fluorescent cells. The output potential of the data driver for driving the data electrode lines in each horizontal driving period is output for a time proportional to the gray level of each of the data electrode lines. Here, the output potential of the data driver is repeatedly changed in synchronization with the respective horizontal drive periods.

According to the electron emission display device of the present invention, the difference between the potential of the scan pulse applied to the scan electrode lines and the output potential of the data driver changes within the horizontal driving period. Therefore, within the respective horizontal drive periods, the image data is determined by determining the output time of the output potential of the data driver based on the point of time when the difference between the potential of the scan pulse and the output potential of the data driver is maximum. The problem of low gradation expression ability can be solved without changing.

Hereinafter, preferred embodiments according to the present invention will be described in detail.

Referring to FIG. 1, an electron emission display device according to an embodiment of the present invention includes an electron emission display panel 1 and a driving device thereof. The driving device of the electron emission display panel 1 includes an image controller 4, a set-top box 5, a panel controller 6, a scan driver 7, a data driver 8, and a power supply 9. .

Image control section 4 includes an image signal from a computer (S _PC), DVD (digital versatile disk) video signal (S _DVD), and processes the video signal from the set-top box 5, the panel control unit 6 from the player To enter. The set top box 5 converts the video signal STV from the _television and inputs it to the video control unit 4.

The panel controller 6 processes the image signal from the image controller 4 to generate scan-drive control signals and data-drive control signals. The scan driver 7 drives the gate electrode lines G ₁ ,..., G _n of the electron emission display panel 1 in accordance with the scan-drive control signals from the panel controller 6. The data driver 8 drives the cathode electrode lines C _R1 ,..., C _Bm of the electron emission display panel 1 in accordance with data-driven control signals from the panel controller 6.

The power supply unit 9 is an anode of the image controller 4, the set-top box 5, the panel controller 6, the scan driver 7, the data driver 8, and the electron emission display panel 1 (see FIG. 2). 22) and potentials required for the focusing electrode plate (36 in FIG. 2) are applied. Here, a high potential of 1 to 4 kilovolts (KV) is applied to the positive electrode plate (22 in Fig. 2).

Referring to FIG. 2, in the electron emission display panel 1 of FIG. 1, the front panel 2 and the rear panel 3 are supported by space bars 41,..., 43. Here, in addition to the space bars 41,..., 43 shown in FIG. 2, a plurality of space bars exist on the focusing electrode plate 36.

The rear panel 3 includes the rear substrate 31, the cathode electrode lines C _R1 , ..., C _Bm , the electron emission sources E _R11 , ..., E _Bnm , and the first insulating layer 33. ), Gate electrode lines G ₁ ,..., G _n , a second insulating layer 35, and a focusing electrode plate 36.

The cathode electrode lines C _R1 , ..., C _Bm to which data signals are applied are electrically connected to the electron emission sources E _R11 , ..., E _Bnm . The first insulating layer 33, the gate electrode lines G ₁ ,..., G _n , the second insulating layer 35, and the focusing electrode plate 36 have electron emission sources E _R11 ... ., E _Bnm) through phrases _(R11 H, corresponding to ..., is formed with H _Bnm). Thus, the scanning signals are applied to the gate electrode lines _{(G 1, ..., G n} ) in, the line through the cathode electrode in a region intersecting with (C _R1, ..., _Bm C) spheres _(R11 H, ..., H _Bnm ) is formed. The focusing signal is applied to the focusing electrode plate 36.

The front panel 2 includes a front transparent substrate 21, a positive electrode plate 22, and fluorescent cells F _R11 ,..., F _Bnm . The fluorescent cells F _R11 ,..., F _Bnm are formed corresponding to the through holes H _R11 ,..., H _Bnm of the focusing electrode plate 36. A high positive potential of 1 to 4 kilovolts (KV) is applied to the positive electrode plate 22 so that electrons from the electron emission sources E _R11 ,..., E _Bnm move to the fluorescent cells.

3 is a driving signal applied to the gate electrode lines G ₁ ,..., G _n , the focusing electrode plate 36, and the cathode electrode lines C _R1 ,..., C _{Bm of} FIG. 2. Show them. 4 shows an example of data pulses for the scan pulses of FIG. 3. A driving signal is applied in Figs. 3 and 4, the reference numeral S _G1 is the gate electrode lines _{(G 1, ..., G n} ) in the first gate electrode lines (G ₁ in FIG. 2), S is the gate electrode _G2 The driving signal applied to the second gate electrode line among the lines G ₁ ,..., And G _n , and S _Gn is the nth gate electrode line among the gate electrode lines G ₁ ,..., G _n . 2 is a drive signal applied to (G _n of FIG. 2), S ₃₆ is a drive signal applied to the focusing electrode plate ( ₃₆ of FIG. 2), and S _CR1 .. _CBm is the cathode electrode lines C _R1 . ., C _Bm ) indicate the driving signals applied to each.

1 to 4, driving signals according to the present invention are described as follows.

The vertical drive period T _VDR includes a vertical display period T _DISP and a vertical synchronization period T _VSYN .

In the vertical display period T _DISP , a positive scan pulse with a single positive potential (+ Vg1) and a single pulse width (T _HDR ) is sequential to the gate electrode lines G ₁ ,..., G _n . Negative data pulses are applied to the cathode electrode lines C _R1 ,..., C _Bm corresponding to the scan pulses.

The output potential of the data driver 8 for driving the cathode electrode lines C _R1 ,..., C _Bm as data electrode lines in each horizontal driving period t1 to t4 and t4 to t7 is the cathode electrode line. (C _R1 , ..., C _Bm ) are output for a time proportional to the respective gray levels. Here, the output potentials (-V _CL to -V _CH ) of the data driver 8 change repeatedly in synchronism with the respective horizontal driving periods t1 to t4 and t4 to t7.

Accordingly, the potential (+ Vg1) of the scan pulse applied to the gate electrode lines G ₁ ,..., G _n as scan electrode lines in each of the horizontal driving periods t1 to t4 and t4 to t7. And the difference (Vg1 + V _CL to Vg1 + V _CH ) between the output potential (-V _CL to -V _CH ) of the data driver 8 changes.

Therefore, within each horizontal driving period t1 to t4 and t4 to t7, the difference between the potential of the scan pulse (+ Vg1) and the output potential (-V _CL to -V _CH ) of the data driver 8 ( By determining the output time of the output potential (-V _CL to -V _CH ) of the data driver 8 on the basis of the time point t3 or t6 where Vg1 + V _CL to Vg1 + V _CH is maximum, A relatively high voltage can be added and applied to the cells. Accordingly, the problem of low gradation representation ability can be solved without changing image data.

More specifically, each horizontal driving period t1 to t4 or t4 to t7 includes a blanking time t1 to t2 or t4 to t5 and a horizontal display time t2 to t4 or t5 to t7. . The output potential (-V _CL ) of the data driver 8 does not change at the blanking times t1 to t2 or t4 to t5. In the horizontal display times t2 to t4 or t5 to t7, the output potentials -V _CL to -V _CH of the data driver 8 continuously change.

Scan pulses having a width T _HDR of each horizontal display time are sequentially applied to the gate electrode lines G ₁ ,... G _n as scan electrode lines. Accordingly, within each horizontal display time t2 to t4, or t5 to t7, the potential (+) of the scan pulse applied to the gate electrode lines G ₁ ,..., G _n as scan electrode lines. The difference (Vg1 + V _CL to Vg1 + V _CH ) between Vg1) and the output potential (-V _CL to -V _CH ) of the data driver 8 changes continuously.

Within each horizontal display time t2 to t4 or t5 to t7, the difference Vg1 between the potential of the scan pulse (+ Vg1) and the output potential (-V _CL to -V _CH ) of the data driver 8. The output time of the output potentials (-V _CL to -V _CH ) of the data driver 8 is determined based on the time point t3 or t6 at which + V _CL to Vg1 + V _CH is maximum.

For example, within each horizontal display time t2 to t4 or t5 to t7, the waveform of the output potential (-V _CL to -V _CH ) of the data driver 8 is a sine wave. Further, the output time of the output potentials (-V _CL to -V _CH ) of the data driver 8 for each of the cathode electrode lines C _R1 ,..., C _Bm as data electrode lines is displayed in each horizontal display. It is determined back and forth from an intermediate time point t3 or t6 of the time t2 to t4 or t5 to t7.

Accordingly, since a relatively high voltage is applied to the cells of low gray level, the problem of low gray level expression capability can be solved without changing image data.

As described above, according to the electron emission display device according to the present invention, the difference between the potential of the scan pulse applied to the scan electrode lines and the output potential of the data driver in the horizontal driving period changes. Therefore, within each horizontal drive period, the output time of the output potential of the data driver is determined on the basis of the point at which the difference between the potential of the scan pulse and the output potential of the data driver is maximum, without changing the image data. The problem of low gradation expression ability can be solved.

The present invention is not limited to the above embodiments, but may be modified and improved by those skilled in the art within the spirit and scope of the invention as defined in the claims.

Claims (11)

Electron emission sources, data electrode lines, scan electrode lines formed to intersect the data electrode lines, fluorescent cells, and a bipolar plate to which a potential is applied to move electrons from the electron emission sources to the fluorescent cells. An electron emission display device, The output potential of the data driver for driving the data electrode lines in each horizontal driving period is output for a time proportional to the gradation of each of the data electrode lines, And an output potential of the data driver is repeatedly changed in synchronization with each of the horizontal driving cycles. The method of claim 1, wherein the horizontal drive cycle, Blanking time for which the output potential of the data driver is not changed, and And a horizontal display time at which the output potential of the data driver is continuously changed. The method of claim 2, And a scanning pulse having a width of each horizontal display time is sequentially applied to the scanning electrode lines. The method of claim 3, wherein within each of said horizontal display times: And the difference between the potential of the scan pulse and the output potential of the data driver is continuously changing. The method of claim 4, wherein within each of said horizontal display times: And an output time of the output potential of the data driver is determined based on a point in time at which the difference between the potential of the scan pulse and the output potential of the data driver is maximum. The method of claim 5, wherein within each said horizontal display time, And a waveform of an output potential of the data driver is a sine wave. The method of claim 6, wherein the output time of the output potential of the data driver for each of the data electrode lines, And an electron emission display device determined back and forth from an intermediate time point of the respective horizontal display time. The method of claim 1, wherein the data electrode lines, An electron emission display device which is cathode electrode lines electrically connected to electron emission sources. The method of claim 8, wherein the scan electrode lines, And gate electrode lines in which through-holes corresponding to the electron emission sources are formed in an area crossing the cathode electrode lines. The method of claim 9, wherein the fluorescent cells, And an electron emission display device corresponding to the through holes of the gate electrode lines. Cathode electrode lines in electrical connection with the electron emitters, Gate electrode lines having through-holes corresponding to the electron emission sources in a region crossing the cathode electrode lines, A focusing electrode plate having through holes corresponding to the through holes of the gate electrode lines; Fluorescent cells formed corresponding to the through holes of the focusing electrode plate, and An electron emission display device comprising a positive electrode plate having a positive potential applied to move electrons from the electron emission sources into the fluorescent cells. In each horizontal driving period, the output potential of the data hole driving the cathode electrode lines is output for a time proportional to the gradation of each of the cathode electrode lines, And an output potential of the data driver is repeatedly changed in synchronization with each of the horizontal driving cycles.

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