WO2007077622A1

WO2007077622A1 - Display device

Info

Publication number: WO2007077622A1
Application number: PCT/JP2006/300006
Authority: WO
Inventors: Koji Shinohe; Manabu Ishimoto; Kenji Awamoto; Hitoshi Hirakawa; Yosuke Yamazaki
Original assignee: Shinoda Plasma Co., Ltd.
Priority date: 2006-01-04
Filing date: 2006-01-04
Publication date: 2007-07-12
Also published as: JPWO2007077622A1

Abstract

In a display device (10), supporting members (6R, 6G, 6B) having phosphor layers (4R, 4G, 4B) are arranged, a discharge gas is applied, a plurality of gas discharge tubes having a plurality of light emitting points in a longitudinal direction, respectively, are arranged in parallel, a plurality of display electrodes (2) are arranged on a display side of the gas discharge tubes, and a plurality of signal electrodes (3) are arranged on the rear side of the gas discharge tubes. The color of the supporting members (6R, 6G, 6B) is white.

Description

Specification

Display device

Technical field

TECHNICAL FIELD [0001] The present invention relates to a display device having a plurality of gas discharge tube forces having a phosphor layer therein, and in particular, includes a plurality of gas discharge tubes in which a support member on which a phosphor layer is formed is incorporated. The present invention relates to a display device.

Background art

[0002] JP-A-11-162357 (Patent Document 1) (Patent No. 3159250) describes a plasma-display panel. The plasma “display” panel includes a plurality of cells having phosphors between two glass substrates, a viewing side substrate and a back side substrate, and emits visible light by exciting the phosphors with ultraviolet energy. In order to prevent the brightness from decreasing and to improve the contrast, the visible light reflectance of the phosphor layer is 25% or less, and the partition walls that separate each cell and the cell that is the surface of the Z or back side substrate Between the bottom surface and the phosphor layer provided on the inner surface of the cell, there is provided a light reflecting layer that efficiently reflects only the emission wavelength of the phosphor of each cell and absorbs other light! /, The

Patent Document 1: Japanese Patent Laid-Open No. 11-162357

Japanese Unexamined Patent Publication No. 2003-317636 (Patent Document 2) describes a color 'plasma' display panel. For the manufacture of the color plasma display panel, a colored layer containing an inorganic pigment for adjusting the emission color is formed on the inner surface of the discharge cell having the barrier ribs as an underlayer of the phosphor. As a result, the emission color can be easily adjusted without forming a color filter, and high brightness and good color purity can be obtained. At this time, the reflectance of the colored layer can be increased by mixing a white pigment or a glass component in the colored layer, and light emission with higher luminance can be obtained with improvement in color tone and contrast.

Patent Document 2: Japanese Patent Laid-Open No. 2003-317636

[0004] Plasma 'tube' array type display devices are known. Japanese Laid-Open Patent Publication No. 2003-92059 (Patent Document 3) describes a method for producing a phosphor layer support member for a gas discharge tube! . In this method, a support member having a size capable of being inserted into a gas discharge tube by stretching the base material is formed, a phosphor layer is formed on the surface of the support member, and the phosphor layer support member formed with the phosphor layer is formed. It is inserted into the gas discharge tube, thereby forming a phosphor layer in the gas discharge tube.

Patent Document 3: Japanese Patent Laid-Open No. 2003-92059

Disclosure of the invention

Problems to be solved by the invention

[0005] In a plasma 'tube' array type display device, normal gas discharge tubes and phosphor support members are transparent, and part of the light emitted from the phosphor layer is behind the display surface. Since it passes through the phosphor support member and the rear portion of the thin tube in the direction, the efficiency of use of emitted light for display is low.

[0006] The inventors have made use of the light emitted from the phosphor layer for display by changing the optical structure of the phosphor support member in the gas discharge tube in the plasma tube 'array type display device. It was recognized that the efficiency could be increased and the light and dark contrast in the bright room of the display device could be improved.

[0007] An object of the present invention is to increase the utilization efficiency of emitted light for display in a gas discharge tube of a display device.

Another object of the present invention is to increase the contrast of display in the gas discharge tube of the display device.

Means for solving the problem

[0009] According to a feature of the present invention, the display device includes a plurality of light emitting points each having a plurality of light emitting points in the longitudinal direction, the support member having the phosphor layer formed therein is disposed and the discharge gas is sealed therein. Gas discharge tubes are juxtaposed, a plurality of display electrodes are arranged on the display surface side of the plurality of gas discharge tubes, and a plurality of signal electrodes are arranged on the back side of the plurality of gas discharge tubes. The support member is white.

[0010] According to another feature of the present invention, the display device includes a support member on which a phosphor layer is formed and a discharge gas sealed therein, and a plurality of light emitting points are provided in the longitudinal direction. A plurality of gas discharge tubes are juxtaposed, and a plurality of tables are arranged on the display surface side of the plurality of gas discharge tubes. The display electrode is disposed, and the support member may include a transparent layer on the display surface side and a reflective layer on the back surface side as an alternative configuration.

The invention's effect

[0011] According to the present invention, it is possible to further increase the use efficiency of the emitted light for display in the gas discharge tube of the display device, and to increase the contrast of the display in the gas discharge tube of the display device. .

BEST MODE FOR CARRYING OUT THE INVENTION

An embodiment of the present invention will be described with reference to the drawings. In the drawings, similar components are denoted by the same reference numerals.

[0013] FIG. 1 illustrates a schematic partial structure of a plasma 'tube' array type color display device 10 according to an embodiment of the present invention. In FIG. 1, the display device 10 includes a plurality of transparent elongated gas / gas discharge tubes 11R, 11G, 11B, 12R, 12G and 12B arranged in parallel to each other, a transparent front support sheet or a thin substrate force. Front support substrate 31, transparent or opaque back support sheet or thin substrate force Back support substrate 32, multiple display electrode pairs or main electrode pair 2, and multiple signal electrodes or address electrodes Contains three. In FIG. 1, X indicates a sustain electrode or X electrode of the display electrode 2, and Y indicates a scan electrode or Y electrode of the display electrode 2. R, G and B indicate red, green and blue, which are the emission colors of the phosphors. The support substrates 31 and 32 are made of, for example, a flexible PET film or glass.

[0014] The elongated gas discharge tubes 11R, 11G, 11B,... Are made of a transparent insulator such as, for example, borosilicate glass, Norex®, soda glass, quartz glass or zerodur, For example, the tube diameter is 2 mm or less, for example, the tube has a cross-sectional width of about lmm and a height of about 0.55 mm, a length of 300 mm or more, and a tube wall thickness of about 0.1 mm. Has dimensions.

[0015] On the back side of the inside of the gas discharge tubes 11R, 11G, 11B,..., Support members formed with phosphor layers 4 of red, green, and blue (R, G, B) are respectively inserted. The discharge gas is introduced and both ends are sealed. On the inner surface of the gas discharge tubes 11R, 11G, 11B,..., An electron emission film 5 having MgO force is formed. The phosphor layers R, G, B are typically , Having a thickness in the range of about 10 m to about 30 μm.

[0016] Like the gas discharge tubes 11R, 11G, and 1IB, the support member is made of an insulator such as borosilicate glass, Pyrex (registered trademark), quartz glass, soda glass, and lead glass. A phosphor layer 4 is formed on the support member. The support member is disposed outside the glass tube by applying a phosphor paste on the support member, firing it to form the phosphor layer 4 on the support member, and then inserting the support member into the glass tube. can do. Various phosphor pastes known in the art can be used for the phosphor base.

The electron emission film 5 generates charged particles by collision with the discharge gas. When a voltage is applied to the display electrode pair 2, the phosphor layer 4 excites the discharge gas sealed in the tube, and emits visible light with vacuum ultraviolet light generated in the deexcitation process of the excited rare gas atoms.

FIG. 2A shows a front-side support substrate 31 on which a plurality of transparent display electrode pairs 2 are formed. FIG. 2B shows a back side support substrate 32 on which a plurality of signal electrodes 3 are formed.

The signal electrode 3 is formed on the front surface, that is, the inner surface of the back-side support substrate 32, and is provided along the longitudinal direction of the gas discharge tubes 11R, 11G, 11B,. The pitch between adjacent signal electrodes 3 is the same as the width of each of the gas discharge tubes 11R, 11G, 11B,..., For example, 1 mm. The plurality of display electrode pairs 2 are formed on the back surface, that is, the inner surface of the front-side support substrate 31 in a well-known form, and are arranged in a direction crossing the signal electrode 3. The width of the display electrode 2 is, for example, 0.75 mm, and the distance between the edges of each pair of display electrodes 2 is, for example, 0.4 mm. A distance serving as a non-discharge region or a non-discharge gap is secured between the display electrode pair 2 and the adjacent display electrode pair 2, and the distance is, for example, 1.1 mm.

[0020] When the display device 10 is assembled, the signal electrode 3 and the display electrode pair 2 are in close contact with the lower outer peripheral surface portion and the upper outer peripheral surface portion of the gas discharge tubes 11R, 11G, 11B,. Touch. In order to improve the adhesion, an adhesive may be interposed between each electrode and the gas discharge tube surface to bond them.

[0021] When the display device 10 is viewed from the front, the intersection between the signal electrode 3 and the display electrode pair 2 is a unit light emitting region. For display, one of the display electrode pairs 2 is used as a scanning electrode, a selective discharge is generated at the intersection of the scanning electrode and the signal electrode 3, and a light emitting region is selected. Display electrodes using wall charges formed on the surface This is done by generating a display discharge in pair 2 and emitting the phosphor layer. The selective discharge is a counter discharge generated in the gas discharge tubes 11R, 11G, 11B,... Between the scanning Y electrode and the signal electrode 3 facing each other in the vertical direction. A display discharge is a surface discharge generated in a gas discharge tube 11R, 11G, 11B,... Between a pair of display electrodes arranged in parallel on a plane.

[0022] The display electrode pair 2 and the signal electrode 3 can generate discharge in the discharge gas inside the tube by applying a voltage. In FIG. 1, the electrode structure of the gas discharge tubes 11R, 11G, 11B,... Has a configuration in which three electrodes are arranged in one light emitting portion, and a display discharge is generated by the display electrode pair. Although the structure is not limited to this, a structure in which display discharge is generated between the display electrode 2 and the signal electrode 3 may be used. In other words, the display electrode pair 2 may be one, and the display electrode 2 may be used as a scanning electrode to generate a selective discharge and a display discharge (opposite discharge) between the display electrode 2 and the signal electrode 3.ヽ.

FIG. 3 shows a cross-sectional structure perpendicular to the longitudinal direction of the tube of the display device 102 according to the embodiment of the present invention. In the display device 102, the gas discharge tubes 11R, 11G, 11B,... Have phosphor layers 4R, 4G, and 4B formed on the inner surfaces of the back side support members 6R, 6G, and 6B. The cross-sectional width is 1. Omm, the cross-sectional height is 0.55mm, the tube wall thickness is 0.1mm, and the length is lm to 3m. As an example, the red phosphor 4R includes a yttria-based ((Y.Ga) BO: Eu) material, and the green phosphor 4G is a zinc silicate-based (Zn SiO: Mn) material.

3 2 4 Materials are included, and blue phosphor 4B includes BAM (BaMgAl 2 O 3: Eu) materials.

10 17

3, a back side support substrate 32 is bonded to the bottom surfaces of the gas discharge tubes 11R, 11G, 11B,. Signal electrodes 3R, 3G, 3B,... Are disposed on the bottom surfaces of the gas discharge tubes 11R, 11G, 11B,.

FIG. 4 shows a cross-sectional structure of the phosphor support members 6R, 6G, and 6B in the gas discharge tubes 11R, 11G, and 11B according to the embodiment of the present invention.

[0026] The support members 6R, 6G, and 6B have a generally boat or rod shape, and the shape of a cross section perpendicular to the longitudinal direction is generally U-shaped or C-shaped. The support members 6R, 6G, and 6B have, for example, a lateral width of about 700 μm, a height force S of about 400 μm, and a wall thickness of about 100 μm.

[0027] The supporting members 6R, 6G, and 6B have a white color, and the above-described borosilicate glass or Nyrec In addition to the usual insulator materials such as S (R), quartz glass, soda glass and lead glass, it contains a white pigment with high reflectivity. The white pigment may be one or more selected from white materials such as alumina, chalk, heavy calcium carbonate, precipitated calcium carbonate, barium sulfate, zinc white pigment and zinc sulfate. Contains material.

[0028] By applying a sustain voltage to the display electrode pair 2, the phosphor layers 4R, 4G, and 4B formed on the support members 6R, 6G, and 6B can emit light emitted inward of the capillary tube. As shown by the solid arrows, a large part of the gas passes through the upper wall of the gas discharge tubes 11R, 11G, and 11B and the front support substrate 31 (FIG. 3). On the other hand, a large part of the light emitted outwardly from the phosphor layers 4R, 4G and 4B tubules is white as the support members 6R, 6G and 6B are white, as indicated by solid arrows. A large portion, that is, a high proportion is reflected to the phosphor layers 4R, 4G, and 4B near the surfaces of the supporting members 6R, 6G, and 6B. The phosphor layer 4R, 4G, and 4B forces are transmitted through the supporting members 6R, 6G, and 6B so that the light emitted outward from the thin tube is indicated by broken arrows.

Therefore, the white support members 6R, 6G, and 6B in FIG. 4 can increase the use efficiency of the emitted light in the gas discharge tubes 11R, 11G, 11B,. Can do. The brightness of the display device 102 using the white supporting members 6R, 6G, and 6B is higher by about 20% than that when the transparent supporting member is used.

[0030] Since the support members 6R, 6G, and 6B are white, the back side support substrate 32 may not be white but may be black. In this case, most of the light that has passed through the front support substrate 31 and entered the black back support substrate 32 is absorbed by the black back support substrate 32 and reflected to the front support substrate 31 side. The rate of being done is very low. As a result, the display device 102 has a high contrast in display even in a bright room.

FIG. 5 shows the structure of the phosphor support members 6R, 6G and 6B in the gas discharge tubes 11R, 11G and 11B according to another embodiment of the present invention.

In FIG. 5, black films 62R, 62G, and 62B having a thickness of, for example, about 10 m are formed on the support members 6R, 6G, and 6B on two end surfaces facing the front support substrate 31 side. ing. Other configurations are the same as those in FIG. That is, the supporting members 6R, 6G and 6 B is white. The black films 62R, 62G and 62B are made of a material such as carbon.

[0033] Most of the light incident on the end faces of the support members 6R, 6G, and 6B from the front-side support substrate 31 side is absorbed by the black films 62R, 62G, and 62B formed on the end faces. The ratio of reflection to the support substrate 31 side is extremely low. As a result, the reflectance of the incident light on the display device 102 is also reduced by about 20% at the maximum. Therefore, the display device 102 has a high contrast in display even in a bright room. For example, in the case of 250 lux indoor lighting, the contrast of bright and dark in a bright room in the case of Fig. 4 is 1:15 for incident light of about 60 cdZm ² . : 18

FIG. 6 shows the structure of phosphor support members 6R, 6G, and 6B in gas discharge tubes 11R, 11G, and 11B according to still another embodiment of the present invention.

In FIG. 6, the supporting members 6R, 6G and 6B are composed of, for example, an inner transparent glass layer 64R, 64G and 64B having a thickness of 85 μm and a thin white layer having a high reflectance, for example, a thickness of 15 m. Colored glass layers 66R, 66G and 66B have a two-layer structure that is also powerful. The transparent glass layers 64 R, 64 G, and 64 B are made of an insulating material such as the above-described borosilicate glass, Pyrex (registered trademark), quartz glass, soda glass, and lead glass, as usual. The white glass layers 66R, 66G, and 66B are reflective in addition to the insulating materials such as the borosilicate glass, Pyrex (registered trademark), quartz glass, soda glass, and lead glass described above, as in FIG. Contains a high percentage of white pigment. The white pigment contains the materials mentioned above.

[0036] The phosphor layer 4R, 4G, and 4B force emitted outwardly from the capillary tube is transmitted through the transparent glass layers 64R, 64G, and 64B inside the support members 6R, 6G, and 6B. Layers 66R, 66G, and 66B are white, so as shown by the solid arrows, a large percentage of the phosphor layers 4R, scattered mostly near the surface of the outer glass layers 66R, 66G, and 66B. Reflected on the 4G and 4B sides. A part of the reflected light passes through the transparent glass layers 64R, 64G and 64B and is repeatedly reflected by the glass layers 66R, 66G and 66B. A large part of the reflected light is shown in the glass layer 6 4R, 64G and 64B are transmitted through the glass layer 64R, 64G and 64B end faces 68R, 68G and 68B, and the upper wall of the gas discharge tubes 11R, 11G and 1IB and the front support substrate 31 ( Transmits through Figure 3).

Therefore, the supporting members 6R, 6G, and 6B in FIG. 4 are used for displaying emitted light in the gas discharge tubes 11R, 11G, 11B,... Of the display device 102, as in FIG. Efficiency can be increased. The brightness of the display device 102 using the two-layered support members 6R, 6G, and 6B in FIG. 6 is about 20% higher than that using the transparent support member.

[0038] As an alternative configuration, the glass layers 66R, 66G, and 66B may be mirror-like metal deposited films. However, in this case, it is necessary to design the structure of the support members 6R, 6G, and 6B so that the light emitted from the end faces 68R, 68G, and 68B is maximized.

[0039] As an alternative configuration, ordinary transparent members are used as the support members 6R and 6G in the red and green gas discharge tubes 11R and 11G in FIGS. 4 to 6, and only the support member 6B in the blue gas discharge tube 11B is used. The structure shown in Figs. 4-6 may be designed to have high reflectivity. Accordingly, the luminance of blue light can be further increased in the display device 102.

[0040] The embodiments described above are merely given as typical examples, and it is obvious for those skilled in the art to combine the constituent elements of the embodiments, and that modifications and variations thereof will be apparent to those skilled in the art. Obviously, various modifications can be made to the embodiments without departing from the scope of the invention as set forth in the principles and claims.

Brief Description of Drawings

[0041] FIG. 1 illustrates a partial structure of a color display device in the form of a plasma 'tube' array, according to an embodiment of the present invention.

FIG. 2A shows a front-side support substrate on which a plurality of transparent display electrode pairs are formed. FIG. 2B shows a backside support substrate on which a plurality of signal electrodes or signal electrodes are formed.

FIG. 3 shows a cross-sectional structure perpendicular to the tube longitudinal direction of the display device according to the embodiment of the present invention.

FIG. 4 is a cross-sectional view of a phosphor support member in a gas discharge tube according to an embodiment of the present invention. Shows the structure.

FIG. 5 shows the structure of a phosphor support member in a gas discharge tube according to another embodiment of the present invention.

FIG. 6 shows the structure of a phosphor support member in a gas discharge tube according to still another embodiment of the present invention.

Claims

The scope of the claims

[1] Inside the support member on which the phosphor layer is formed is disposed and the discharge gas is sealed.

A plurality of gas discharge tubes each having a plurality of light emitting points in the longitudinal direction, a plurality of display electrodes are disposed on the display surface side of the plurality of gas discharge tubes, and a plurality of gas discharge tubes are disposed on the back side of the plurality of gas discharge tubes. A display device in which the signal electrodes are arranged,

The display device according to claim 1, wherein the support member is white.

[2] The display device according to [1], wherein a black film is formed on an end surface of the support member on the display surface side.

[3] The display device according to [1], wherein the support member contains a white pigment.

[4] A support member having a phosphor layer formed therein is disposed and a discharge gas is sealed therein, and a plurality of gas discharge tubes each having a plurality of emission points in the longitudinal direction are juxtaposed, and the plurality of gas discharges A display device in which a plurality of display electrodes are arranged on the display surface side of a tube, and a plurality of signal electrodes are arranged on the back side of the plurality of gas discharge tubes,

The display device according to claim 1, wherein the support member includes a transparent layer on the display surface side and a reflective layer on the back surface side.

5. The display device according to claim 4, wherein the outer reflective layer is a white layer.