Display device

Abstract

In a display device is capable of performing the gradation display of high bits by regulating the sheet resistance of the signal lines according to the set operation conditions of a display panel, plural pixels that are formed of plural sub-pixels each consisting of a pair of a cathode and a phosphor layer are arranged in a matrix to constitute a two-dimensional display region, and wherein when Ry is a vertical resolution of the display region, η is a cathode efficiency, Ies is a peak current per color sub-pixel, Ed [V] is the maximum amplitude of a drive voltage that is applied to the signal lines, b is the number of gradation bits, and SR[Ω/□] is a sheet resistance of the signal lines, SR<η·Ed/3·2b·Ies·Ry is satisfied.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

These and other objects and advantages of this invention will become more fully apparent from the following detailed description taken with the accompanying drawings in which:

FIG. 1 is a partially broken perspective view showing the overall configuration of a light-emitting flat panel display device according to the present invention;

FIG. 2 is a cross-sectional view taken along a line A-A′ of FIG. 1;

FIGS. 3A to 3C are diagrams for explaining an example of a cathode in FIGS. 1 and 2; and

FIG. 4 is an explanatory diagram showing an equivalent circuit example of the light-emitting flat panel display device according to the present invention.

Claims

1. A display device, comprising: a back panel including a large number of scanning lines that extend in a first direction, are arranged in a second direction which crosses the first direction, and supplies a horizontal scanning signal, a large number of signal lines that extend in the second direction so as to interpose an insulating layer between the signal lines and the scanning lines, and arranged in the first direction, a drive signal of display data being supplied to the signal lines, and cathodes that connect the scanning lines and the signal lines;a front panel including phosphor layers of plural colors which emit light by excitation of electrons that are extracted from the cathodes, and an anode that applies an accelerating voltage to an electron source; anda sealing frame that is interposed in a peripheral portion between the back panel and the front panel to produce a depressurized internal space,wherein: a plurality of pixels that are formed of a plurality of sub-pixels are arranged in a matrix to constitute a two-dimensional display region; andwhen Ry is a vertical resolution of the display region, η is a cathode efficiency, Ies is a peak current per color sub-pixel, Ed [V] is the maximum amplitude of a drive voltage that is applied to the signal lines, b is the number of gradation bits, and SR[Ω/□] is a sheet resistance of the signal lines, SR<η·Ed/3·2b·Ies·Ry is satisfied.

2. A display device, comprising: a back panel including a large number of scanning lines that extend on a main surface in a first direction, are arranged in a second direction which crosses the first direction, and supplies a horizontal scanning signal, a large number of signal lines that extend in the second direction so as to interpose an insulating layer between the signal lines and the scanning lines, and arranged in the first direction, a drive signal of display data being supplied to the signal lines, and cathodes that connect the scanning lines and the signal lines;a front panel including phosphor layers of plural colors which emit light by excitation of electrons that are extracted from the cathodes, and an anode that applies an accelerating voltage to an electron source; anda sealing frame that is interposed in a peripheral portion between the back panel and the front panel to produce a depressurized internal space,wherein: a plurality of pixels that are formed of a plurality of sub-pixels are arranged in a matrix to constitute a two-dimensional display region; andwhen V [m] is a diagonal dimension of the display region, Rx is the number of pixels in a horizontal direction, Ea [V] is an anode voltage, Eath [V] is a light emission start anode voltage, q is a cathode efficiency, Bp [cd/m2] is a peak brightness, Ed [V] is the maximum amplitude of a drive voltage, b is the number of gradation bits, and SR[Ω/□] is a sheet resistance of the signal lines, SR<Cη·Ed(Ea−Eath)·Rx/3·2b·Bp·V2 (C is a constant) is satisfied.

3. A display device, comprising: a back panel including a large number of scanning lines that extend in a first direction, are arranged in a second direction which crosses the first direction, and supplies a horizontal scanning signal, a large number of signal lines that extend in the second direction so as to interpose an insulating layer between the signal lines and the scanning lines, and arranged in the first direction, a drive signal of display data being supplied to the signal lines, and cathodes that connect the scanning lines and the signal lines;a front panel including phosphor layers of plural colors which emit light by excitation of electrons that are extracted from the cathodes, and an anode that applies an accelerating voltage to an electron source; anda sealing frame that is interposed in a peripheral portion between the back panel and the front panel to produce a depressurized internal space,wherein: a plurality of pixels that are formed of a plurality of sub-pixels are arranged in a matrix to constitute a two-dimensional display region; andwhen V [m] is a diagonal dimension of the display region, Rx is the number of pixels in a horizontal direction, Ea [V] is an anode voltage, η is a cathode efficiency, Bp [cd/m2] is a peak brightness, and SR[Ω/□] is a sheet resistance of the signal lines, SR<0.00047η·(Ea−3000)·Rx/Bp·V2 is satisfied.

4. A display device, comprising: a back panel including a large number of scanning lines that extend in a first direction, are arranged in a second direction which crosses the first direction, and supplies a horizontal scanning signal, a large number of signal lines that extend in the second direction so as to interpose an insulating layer between the signal lines and the scanning lines, and arranged in the first direction, a drive signal of display data being supplied to the signal lines, and cathodes that connect the scanning lines and the signal lines;a front panel including phosphor layers of plural colors which emit light by excitation of electrons that are extracted from the cathodes, and an anode that applies an accelerating voltage to an electron source; anda sealing frame that is interposed in a peripheral portion between the back panel and the front panel to produce a depressurized internal space,wherein: a plurality of pixels that are formed of a plurality of sub-pixels are arranged in a matrix to constitute a two-dimensional display region; andwhen a diagonal dimension of the display region is nominal 32 inches, the number of pixels in a horizontal direction is 1366, the number of pixels in a vertical direction is 768, an anode voltage is 7 kV, a cathode efficiency is η, and a peak brightness is 500 [cd/m2], a sheet resistance of the signal lines SR [Ω/□] satisfies SR<7.775η.

5. The display device according to claim 4, wherein the sheet resistance of the signal lines is 0.38875 [Ω/□].