JP4641437B2 - Field emission type surface light source - Google Patents

Field emission type surface light source Download PDF

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JP4641437B2
JP4641437B2 JP2005063390A JP2005063390A JP4641437B2 JP 4641437 B2 JP4641437 B2 JP 4641437B2 JP 2005063390 A JP2005063390 A JP 2005063390A JP 2005063390 A JP2005063390 A JP 2005063390A JP 4641437 B2 JP4641437 B2 JP 4641437B2
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panel
front panel
dome
depth direction
light source
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JP2006252782A (en
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方紀 羽場
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Pureron Japan Co Ltd
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本発明は、液晶表示装置等、各種表示装置を裏面から照射するのに好適に用いることができるフィールドエミッション型（ＦＥＤ）型面状光源に関するものである。   The present invention relates to a field emission type (FED) type planar light source that can be suitably used for irradiating various display devices such as liquid crystal display devices from the back side.

平面的な広がりを有する照明を行う面状光源には、該面状光源を液晶表示装置の直下に配設する直下方式と、液晶表示装置の直下に導光板を配設し、導光板の端面と平行に面状光源を配置するエッジライト方式とがある。近年の薄型化優先のパーソナルコンピュータ、薄型テレビ等においては、直下方式の面状光源に代わり、エッジライト方式が面状光源の主流となってきている。しかしながら、エッジライト方式では、導光板に入射する光の入射効率が低いと、高輝度化が期待しにくい。これと比較して直下方式では、液晶表示装置に直接光を入射させることができ、光入射効率が極めて高いという利点がある。   For a planar light source that performs illumination having a planar spread, a planar system in which the planar light source is disposed directly under the liquid crystal display device, and a light guide plate is disposed directly under the liquid crystal display device, and an end surface of the light guide plate There is an edge light method in which a planar light source is arranged in parallel with the light source. In recent personal computers, thin televisions, and the like, which are prioritized in thinning, the edge light method has become the mainstream of planar light sources instead of the direct surface light sources. However, in the edge light system, if the incident efficiency of light incident on the light guide plate is low, it is difficult to expect high brightness. Compared to this, the direct method has an advantage that light can be directly incident on the liquid crystal display device and the light incident efficiency is extremely high.

このような直下方式の面状光源には、フロントパネルの内面に蛍光体付きアノード膜を設け、リアパネルの内面に蛍光体付きアノード膜に対向して電子放出用カソードを配置したフィールドエミッション型面状光源がある（特許文献１参照。）。このフィールドエミッション型面状光源では、フロントパネルを液晶表示装置の背面に取り付け、内部の発光光をフロントパネルを介して液晶表示装置に出射する構造となっており、このフロントパネルは液晶表示装置への光の入射効率を高めるため、ガラス等の透明部材により比較的薄肉に構成されているため、液晶表示装置の大型化かつ薄型化に伴ない、フロントパネルには過大な真空圧がかかり、変形を受け易いという課題がある。   In such a direct light source, a field emission type surface light source is provided with an anode film with a phosphor on the inner surface of the front panel and an electron emission cathode disposed on the inner surface of the rear panel so as to face the anode film with the phosphor. There is a light source (see Patent Document 1). This field emission type planar light source has a structure in which a front panel is attached to the back surface of a liquid crystal display device, and internal light emission is emitted to the liquid crystal display device through the front panel. In order to increase the incident efficiency of light, it is made relatively thin with a transparent member such as glass, etc. As the liquid crystal display device becomes larger and thinner, an excessive vacuum pressure is applied to the front panel, causing deformation. There is a problem that it is easy to receive.

そこで、本出願人は、特願２００５−０００８０２号（発明の名称「フィールドエミッション型面状光源」）でフロントパネルとリアパネルとの間に奥行き方向に長く延びる複数のリブを横方向に間隔をあけて立設し該複数のリブのリブ端面でフロントパネルを支持して該フロントパネルの補強を行う発明を出願している。しかしながら、このリブでは、蛍光体付きアノード膜の蛍光体からの発光光がリブで邪魔されてフロントパネル前方に出射されにくくなり、フロントパネル前方からの発光光に縞模様状の発光むらが発生するという不具合がある。
特開２００１−３３８７２３ In view of this, the applicant of the present invention disclosed in Japanese Patent Application No. 2005-000802 (invention name “Field Emission Type Surface Light Source”) spaced a plurality of ribs extending in the depth direction between the front panel and the rear panel in the lateral direction. An invention has been filed in which the front panel is supported by the rib end surfaces of the plurality of ribs to reinforce the front panel. However, in this rib, the light emitted from the phosphor of the anode film with the phosphor is obstructed by the rib and is not easily emitted in front of the front panel, and uneven emission in a stripe pattern occurs in the light emitted from the front of the front panel. There is a problem that.
JP 2001-338723 A

したがって、本発明により解決すべき課題は、リブを設けなくてもフロントパネルが内圧で変形しにくくして、大型かつ薄型に対応可能な構造とし、そのうえで、発光むらなく均一かつ高輝度発光を可能としたフィールドエミッション型の面状光源を提供することである。   Therefore, the problem to be solved by the present invention is that the front panel is not easily deformed by internal pressure without providing ribs, and can be configured to be large and thin, and furthermore, uniform and high-luminance light emission is possible without uneven light emission. It is to provide a field emission type planar light source.

本発明によるフィールドエミッション型面状光源は、各々奥行き方向に直行する平面における断面形状がドーム状をなす複数のドーム形状部分を奥行き方向に直行する方向である横方向に一体に並設するとともに奥行き方向に延ばして配置してフロントパネルを構成し、各ドーム形状部分に対応して一体のリアパネルを横方向に配置し、フロントパネルの各ドーム形状部分それぞれの内面に蛍光体付きアノード膜を設けるとともにリアパネルの各ドーム形状部分に対応する部分のそれぞれの内面側の横方向中央位置にワイヤ状カソードを奥行き方向に延ばして配置し、フロントパネルの各ドーム形状部分の厚さをリアパネルに近いほど厚くして吸光度を大きくしたことを特徴とするものである。
また、本発明によるフィールドエミッション型面状光源は、各々奥行き方向に直行する平面における断面形状がドーム状をなす複数のフロントパネルを奥行き方向に直行する方向である横方向に並設するとともに奥行き方向に延ばして配置し、各フロントパネルに対応して複数のリアパネルを横方向に配置し、各フロントパネルそれぞれの内面に蛍光体付きアノード膜を設けるとともに各リアパネルそれぞれの内面側の横方向中央位置にワイヤ状カソードを奥行き方向に延ばして配置し、各フロントパネルの厚さをリアパネルに近いほど厚くして吸光度を大きくしたことを特徴とするものである。 The field emission type planar light source according to the present invention has a plurality of dome-shaped portions each having a dome-shaped cross section in a plane perpendicular to the depth direction, which are arranged side by side in the transverse direction, which is a direction perpendicular to the depth direction. A front panel is configured by extending in the direction, and an integrated rear panel is disposed in the horizontal direction corresponding to each dome-shaped portion, and an anode film with a phosphor is provided on the inner surface of each dome-shaped portion of the front panel. A wire-like cathode is arranged extending in the depth direction at the center position on the inner surface side of each part corresponding to each dome-shaped part of the rear panel, and the thickness of each dome-shaped part on the front panel is increased as it is closer to the rear panel. Thus, the absorbance is increased.
In addition, the field emission type planar light source according to the present invention has a plurality of front panels each having a dome-like cross-sectional shape in a plane orthogonal to the depth direction arranged side by side in the horizontal direction, which is a direction orthogonal to the depth direction. A plurality of rear panels are arranged in the horizontal direction corresponding to each front panel, an anode film with a phosphor is provided on the inner surface of each front panel, and at the center in the horizontal direction on the inner surface side of each rear panel. The wire-like cathode is extended in the depth direction, and the thickness of each front panel is increased as it is closer to the rear panel to increase the absorbance.

また、本発明によるフィールドエミッション型面状光源は、各々奥行き方向に直行する平面における断面形状がドーム状をなす複数のドーム形状部分を奥行き方向に直行する方向である横方向に一体に並設するとともに奥行き方向に延ばして配置してフロントパネルを構成し、各ドーム形状部分に対応して複数のリアパネルを横方向に配置し、フロントパネルの各ドーム形状部分それぞれの内面に蛍光体付きアノード膜を設けるとともに各リアパネルそれぞれの内面側の横方向中央位置にワイヤ状カソードを奥行き方向に延ばして配置し、フロントパネルの各ドーム形状部分の厚さをリアパネルに近いほど厚くして吸光度を大きくしたことを特徴とするものである。
さらに、本発明によるフィールドエミッション型面状光源は、各々奥行き方向に直行する平面における断面形状がドーム状をなす複数のフロントパネルを奥行き方向に直行する方向である横方向に並設するとともに奥行き方向に延ばして配置し、各フロントパネルに対応して一体のリアパネルを横方向に配置し、各フロントパネルそれぞれの内面に蛍光体付きアノード膜を設けるとともにリアパネルの各フロントパネルに対応する部分のそれぞれの内面側の横方向中央位置にワイヤ状カソードを奥行き方向に延ばして配置し、各フロントパネルの厚さをリアパネルに近いほど厚くして吸光度を大きくしたことを特徴とするものである。 In the field emission type surface light source according to the present invention, a plurality of dome-shaped portions each having a dome-like cross-sectional shape in a plane perpendicular to the depth direction are integrally arranged side by side in a direction perpendicular to the depth direction. In addition, the front panel is configured by extending in the depth direction, and a plurality of rear panels are disposed in the horizontal direction corresponding to each dome-shaped portion, and an anode film with a phosphor is provided on the inner surface of each dome-shaped portion of the front panel. In addition, the wire-shaped cathode was extended in the depth direction at the center position on the inner surface side of each rear panel, and the thickness of each dome-shaped part of the front panel was increased as it was closer to the rear panel to increase the absorbance. It is a feature.
Furthermore, the field emission type planar light source according to the present invention includes a plurality of front panels each having a dome-shaped cross section in a plane orthogonal to the depth direction, arranged side by side in the horizontal direction, which is a direction orthogonal to the depth direction. A rear panel is integrally formed in the horizontal direction corresponding to each front panel, and an anode film with a phosphor is provided on the inner surface of each front panel, and each part of the rear panel corresponding to each front panel is provided. A wire-like cathode is arranged extending in the depth direction at the center in the lateral direction on the inner surface side, and the thickness of each front panel is increased as it is closer to the rear panel to increase the absorbance.

上記ワイヤ状カソードは、導電性ワイヤの表面に尖鋭な微細部分を多数備えたカーボン膜を電子放出部として形成して構成することが好ましい。導電性ワイヤの表面に微視的なサイズの凹凸を形成することが、より低電界の印加でより多くの電子を放出させることができて好ましい。カーボン膜は、例えば、チューブ形状、ウォール形状、その他の形状を備えたカーボンナノ材料からなる膜を含む。上記「尖鋭」には、多少の丸みがあっても電子放出特性を有するものであれば尖鋭に含むことができる。   The wire-like cathode is preferably configured by forming a carbon film having a number of sharp fine portions on the surface of the conductive wire as an electron emission portion. It is preferable to form microscopic irregularities on the surface of the conductive wire because more electrons can be emitted by applying a lower electric field. The carbon film includes, for example, a film made of a carbon nanomaterial having a tube shape, a wall shape, or other shapes. The “sharp” can be sharply included as long as it has electron emission characteristics even if it is somewhat rounded.

本発明のフィールドエミッション型面状光源によると、リアパネルとフロントパネルそれぞれのパネル面積を横方向幅、奥行き方向幅共に大きくして大型でかつ薄型の面状光源としても、フロントパネルの複数のドーム形状部分または複数のフロントパネルそれぞれが横方向断面がドーム状をなして横方向に並設されているので、フロントパネルとリアパネルとの間の内圧を受けて変形するおそれが軽減される。 According to the field emission type planar light source of the present invention, the rear panel and front panel each panel area the transverse width, even large and thin surface light source to both increase the depth width, a plurality of domes of the front panel Since each of the shape portion or the plurality of front panels is arranged side by side in a horizontal direction with a cross section in the lateral direction, the possibility of deformation due to internal pressure between the front panel and the rear panel is reduced.

本発明のフィールドエミッション型面状光源によると、複数のフロントパネルの隣接間に対応する位置にリブを用いていないから、蛍光体の発光光の強度が従来のようにリブにより低下され、その低下した箇所で縞模様状に暗くならずに済む。   According to the field emission type planar light source of the present invention, since the rib is not used at the position corresponding to the adjacent front panel, the intensity of the emitted light of the phosphor is lowered by the rib as in the prior art, and the reduction. It is not necessary to darken the striped pattern at the spot.

以上において、本発明のフィールドエミッション型面状光源によると、複数のフロントパネルの隣接間では、リブが無いために明暗の縞模様が発生するおそれがない。しかしながら、隣接するフロントパネルの横方向で対向するパネル部分の肉厚が同じであれば、各パネル部分それぞれから出射する互いの発光光がパネル部分が接近するほど強め合うことにより、フロントパネルの隣接間での発光光の強度がフロントパネルの中央寄りからの発光光の強度より高くなり、暗い縞模様にはならないものの、発光光の強度が横方向に均一化されにくくなるおそれがある。   In the above, according to the field emission type planar light source of the present invention, there is no possibility that a bright and dark stripe pattern is generated between the adjacent front panels because there is no rib. However, if the thickness of the panel portions facing each other in the lateral direction of the adjacent front panel is the same, the light emitted from each panel portion is strengthened as the panel portions approach each other. The intensity of the emitted light between them becomes higher than the intensity of the emitted light from the center of the front panel, and although it does not form a dark stripe pattern, the intensity of the emitted light may not be uniformed in the horizontal direction.

そこで、本発明では、フロントパネルの各ドーム形状部分の厚さをリアパネルに近いほど厚くして吸光度を大きくし、または各フロントパネルの厚さをリアパネルに近いほど厚くして吸光度を大きくしたことを特徴とするものである。すなわち、ランベルトの法則によると、入射光の強度をＩｏ、透過光の強度をＩ、吸光度をＡ、光が通過する層の厚さをＬ、光の吸収をする物質の濃度をＣ、モル吸光係数をＥとすると、Ａ＝ｌｏｇ（Ｉｏ／Ｉ）＝ＥＣＬが成立する。この式から、濃度Ｃが一定であれば、透過光の強度Ｉは、光が通過する層の厚さＬが厚くなると、指数関数的に少なくなる。本発明では、上記光が通過する層の厚さＬがパネル部分の肉厚に対応し、また、フロントパネルの濃度Ｃはどのパネル部分でも一定である。また、入射光の強度Ｉｏも一定である。したがって、本発明では、フロントパネルの各ドーム形状部分の厚さをリアパネルに近いほど厚くし、または各フロントパネルの厚さをリアパネルに近いほど厚くしたことから、フロントパネルの各ドーム形状部分または各フロントパネルがリアパネルに近いほど吸光度が増し、その結果、該フロントパネルのドーム形状部分またはフロントパネルを通過する光の強度は指数関数的に小さくなり、隣接するフロントパネルのドーム形状部分またはフロントパネルを通過する光の強度は平面方向から見ると、ほぼ均一化されるようになる。この均一化はフロントパネルのドーム形状の設定でより高いレベルを達成することができる。 Therefore, in the present invention, the thickness of each dome-shaped portion of the front panel is increased as it is closer to the rear panel to increase the absorbance, or the thickness of each front panel is increased as it is closer to the rear panel to increase the absorbance. It is a feature. That is, according to Lambert's law, the intensity of incident light is Io, the intensity of transmitted light is I, the absorbance is A, the thickness of the layer through which light passes is L, the concentration of the substance that absorbs light is C, and the molar absorption is When the coefficient is E, A = log (Io / I) = ECL is established. From this equation, if the concentration C is constant, the intensity I of the transmitted light decreases exponentially as the thickness L of the layer through which the light passes increases. In the present invention, the thickness L of the layer through which the light passes corresponds to the thickness of the panel portion, and the density C of the front panel is constant in any panel portion. Further, the intensity Io of incident light is also constant. Therefore, in the present invention, the thickness of each dome-shaped portion of the front panel is increased as it is closer to the rear panel, or the thickness of each front panel is increased as it is closer to the rear panel. As the front panel is closer to the rear panel, the absorbance increases, and as a result, the intensity of light passing through the dome-shaped portion or front panel of the front panel decreases exponentially, and the dome-shaped portion or front panel of the adjacent front panel decreases. The intensity of the light passing therethrough is almost uniform when viewed from the plane direction. This homogenization can be achieved at a higher level with the dome shape setting of the front panel.

以上のことから、本発明の面状光源を液晶表示装置の直下にバックライトとして用いた場合、入射効率、入射光量、均一で高輝度発光に優れたバックライトとして用いることが可能となる。   From the above, when the planar light source of the present invention is used as a backlight directly under a liquid crystal display device, it can be used as a backlight excellent in incident efficiency, incident light amount, uniform and high luminance emission.

本発明は、パネル部分の厚さをパネル高さが低くなるに従い指数関数的に厚くすることもできる。このように指数関数的にパネル部分の厚さを厚くした場合は、パネル部分のパネル高さが低くなるに従い、該パネル部分を通過する光の強度を比例的に小さくすることができる。   In the present invention, the thickness of the panel portion can be increased exponentially as the panel height decreases. When the thickness of the panel portion is increased exponentially in this way, the intensity of light passing through the panel portion can be reduced proportionally as the panel height of the panel portion decreases.

本発明は、フロントパネルの材質としてパネル高さとは無関係に一定の吸光度を有する材質を選定することができる。フロントパネルが無色透明ガラスであっても、光（可視領域や紫外領域の光）は物質を通過するとき、光のエネルギーにより物質の電子状態に変化（基底状態の電子が遷移する変化）を起こし、光はエネルギーを消費する。この現象を吸光（吸収）という。光が消費するエネルギーは、物質により異なり、したがって、フロントパネルの材質の選定により、入射光の強度と透過光の強度との比を設定することができる。   In the present invention, a material having a constant absorbance can be selected as the material of the front panel regardless of the panel height. Even if the front panel is colorless and transparent glass, when light (light in the visible region or ultraviolet region) passes through the material, it changes to the electronic state of the material (change in which the electrons in the ground state transition) due to the energy of the light. , Light consumes energy. This phenomenon is called absorption (absorption). The energy consumed by light varies depending on the substance, and therefore the ratio between the intensity of incident light and the intensity of transmitted light can be set by selecting the material of the front panel.

パネル部分の厚さをパネル高さの低減に従い、どの程度の割合で厚くするとフロントパネルの発光を均一にできるかは、吸光光度計等を用いて実験的に決定することができる。   It can be experimentally determined by using an absorptiometer or the like how much the thickness of the panel portion is increased in accordance with the reduction in the panel height, and how much the thickness of the panel portion can be made uniform.

ランベルトの法則とは異なり、ベールの法則によると、パネル部分の厚さをパネル高さとは無関係に一定とし、濃度を濃くすると、透過光の強さを指数関数的に減少させることができる。したがって、他の発明として、フロントパネルの材質をパネル高さが低くなるに従い、高濃度、すなわち、光透過率を小さくしてもよい。例えば、パネルを着色し、その色の濃度を濃淡に変化させることでも実施することができる。   Unlike Lambert's law, according to Beer's law, the intensity of transmitted light can be reduced exponentially by keeping the thickness of the panel portion constant regardless of the panel height and increasing the concentration. Therefore, as another invention, the front panel material may be made to have a higher density, that is, light transmittance, as the panel height becomes lower. For example, it can also be carried out by coloring the panel and changing the color density to light and shade.

本発明によれば、リブを設けなくてもフロントパネルが内圧で変形しにくくして、大型かつ薄型に対応可能として発光むらがなく均一かつ高輝度発光を可能としたフィールドエミッション型の面状光源を提供することができる。   According to the present invention, a field emission type planar light source that makes it difficult to be deformed by an internal pressure without providing ribs, and that can be made large and thin, and can emit light uniformly and with high brightness without unevenness in light emission. Can be provided.

以下、添付した図面を参照して本発明の実施の形態に係るフィールドエミッション型面状光源（面状光源と略する）を詳細に説明する。   Hereinafter, a field emission type planar light source (abbreviated as planar light source) according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

図１ないし図４を参照して本発明の実施の形態に係る面状光源を説明する。図１は、面状光源を正面方向から見て示す断面図、図２は、面状光源を平面方向から見て示す平面図、図３は、図１の面状光源の要部を拡大して示す断面図、図４は、ランベルトの法則によるパネル厚さと吸光度との関係を示す図である。   A planar light source according to an embodiment of the present invention will be described with reference to FIGS. 1 is a cross-sectional view showing a surface light source as viewed from the front direction, FIG. 2 is a plan view showing the surface light source as viewed from the plane direction, and FIG. 3 is an enlarged view of the main part of the surface light source in FIG. FIG. 4 is a diagram showing the relationship between panel thickness and absorbance according to Lambert's law.

まず、図１および図２を参照して、実施形態の面状光源１０は、横方向断面がドーム状をなす複数のフロントパネル１２を備える。各フロントパネル１２は、横方向に並設されるとともに奥行き方向管状に延ばして配置されている。フロントパネル１２の横方向断面形状のドーム状には、半円形状が好ましいが、これに限定されず、半楕円形状も含むことができる。あるいは、放物線形状でも指数関数的に変化する形状、さらには単なる凸曲面形状も含むことができる。各フロントパネル１２は横方向で一体化されて１つのフロントパネル構成になっている。フロントパネル１２は、透明ないしは半透明のガラスや樹脂等の光透過性材料から成形されている。   First, with reference to FIG. 1 and FIG. 2, the planar light source 10 of the embodiment includes a plurality of front panels 12 whose cross section in the lateral direction forms a dome shape. Each front panel 12 is arranged in parallel in the horizontal direction and extends in a tubular shape in the depth direction. Although the semicircular shape is preferable for the dome shape of the cross section in the lateral direction of the front panel 12, it is not limited to this, and a semielliptical shape can be included. Alternatively, a parabolic shape can also include a shape that changes exponentially, or a simple convex curved surface shape. Each front panel 12 is integrated in the lateral direction to form one front panel. The front panel 12 is formed from a light transmissive material such as transparent or translucent glass or resin.

フロントパネル１２それぞれの内面には蛍光体付きアノード膜１４が設けられている。蛍光体付きアノード膜１４は、ＩＴＯ膜等の透明性電極やアルミニウム蒸着膜等の光透過性電極からなるアノード膜１４ａとそのアノード膜１４ａ上の蛍光体１４ｂとから構成されている。   An anode film 14 with a phosphor is provided on the inner surface of each front panel 12. The anode film 14 with a phosphor is composed of an anode film 14a made of a transparent electrode such as an ITO film or a light transmissive electrode such as an aluminum vapor deposition film, and a phosphor 14b on the anode film 14a.

各フロントパネル１２に対応して複数のリアパネル１６が横方向に配置されている。各リアパネル１６は横方向で一体化されて１つのリアパネル構成になっている。リアパネル１６は、樹脂等の絶縁材料から成形されている。各リアパネル１６それぞれの内面側の横方向中央位置にはワイヤ状カソード１８が奥行き方向に延ばした状態で配置されている。ワイヤ状カソード１８は、導電性ワイヤ１８ａの外表面に尖鋭な微細部分を多数備えたカーボン膜（電子放出部）１８ｂを形成して構成されている。導電性ワイヤ１８ａの表面に微視的なサイズの凹凸１８ｃを形成することが、より低電界の印加でより多くの電子をカーボン膜１８ｂから放出させることができて好ましい。カーボン膜１８ｂは、例えば、ナノチューブ形状、ナノウォール形状、その他の形状を備えたカーボンナノ材料からなる膜を含む。上記「尖鋭」には、多少の丸みがあっても電子放出特性を有するものであれば尖鋭に含むことができる。   A plurality of rear panels 16 are arranged in the horizontal direction corresponding to each front panel 12. Each rear panel 16 is integrated in the lateral direction to form one rear panel. The rear panel 16 is formed from an insulating material such as resin. A wire-like cathode 18 extends in the depth direction at the center position in the lateral direction on the inner surface side of each rear panel 16. The wire-like cathode 18 is configured by forming a carbon film (electron emission portion) 18b having many sharp fine portions on the outer surface of the conductive wire 18a. It is preferable to form the microscopic-sized unevenness 18c on the surface of the conductive wire 18a because more electrons can be emitted from the carbon film 18b by applying a lower electric field. The carbon film 18b includes, for example, a film made of a carbon nanomaterial having a nanotube shape, a nanowall shape, or other shapes. The “sharp” can be sharply included as long as it has electron emission characteristics even if it is somewhat rounded.

実施の形態では、ワイヤ状カソード１８がリアパネル１６の中央位置であり、フロントパネル１２がワイヤ状カソード１８を中心とする一定の半径ｒの円周上に位置するので、ワイヤ状カソード１８から均等な電子放出を行い、フロントパネル１２内面の蛍光体１４ｂに衝突させることができるから、蛍光体１４ｂをフロントパネル１２全体にわたり均等な輝度で発光させることができる。   In the embodiment, the wire-like cathode 18 is located at the center position of the rear panel 16, and the front panel 12 is located on the circumference of a certain radius r centered on the wire-like cathode 18. Since electrons can be emitted and collide with the phosphor 14b on the inner surface of the front panel 12, the phosphor 14b can emit light with uniform brightness over the entire front panel 12.

以上の構成を備えた実施の形態の面状光源１０においては、複数のフロントパネル１２のうち互いに横方向に隣接するフロントパネル１２間において隣接する側のパネル部分１２ａの厚さをパネル高さが低くなるに従い厚くして吸光度を大きくし、これによって両パネル部分１２ａの隣接距離が短くなるほど、透過光の強度を小さくし、フロントパネル１２全体での発光輝度の均一化を可能としたことを特徴とするものである。   In the planar light source 10 of the embodiment having the above configuration, the panel height is set to the thickness of the panel portion 12a on the adjacent side between the front panels 12 adjacent to each other in the lateral direction among the plurality of front panels 12. As the thickness decreases, the thickness is increased and the absorbance is increased. As a result, the intensity of transmitted light is reduced as the adjacent distance between the two panel portions 12a is shortened, and the emission luminance can be made uniform throughout the front panel 12. It is what.

このパネル部分１２ａの厚さと該パネル部分１２ａの吸光度との関係を図３および図４を参照して説明する。図３は、図１の面状光源の要部を拡大して示す断面図、図４は横軸にパネル厚さ（Ｌ）、縦軸に吸光度（Ｅ＝ｌｏｇ（Ｉｏ／Ｉ））とする図である。   A relationship between the thickness of the panel portion 12a and the absorbance of the panel portion 12a will be described with reference to FIGS. FIG. 3 is an enlarged cross-sectional view showing the main part of the planar light source of FIG. 1, and FIG. 4 shows the panel thickness (L) on the horizontal axis and the absorbance (E = log (Io / I)) on the vertical axis. FIG.

図３を参照して、横方向に隣接するフロントパネル１２間において隣接する側のパネル部分１２ａのうち、パネル高さＨ１のパネル部分１２ａについては第１パネル部分１２ａ１としてその厚さをＬ１、パネル高さＨ２のパネル部分１２ａについては第２パネル部分１２ａ２としてその厚さをＬ２とする。蛍光体１４ｂの発光により第１パネル部分１２ａ１への入射光の強度をＩｏ、透過光の強度をＩ´、第２パネル部分１２ａ２への入射光の強度をＩｏ、透過光の強度をＩ´´とする。そうすると、ランベルトの法則により、第１パネル部分１２ａ１の吸光度Ｅ１はｌｏｇ（Ｉｏ／Ｉ´）であり、第２パネル部分１２ａ２の吸光度Ｅ２はｌｏｇ（Ｉｏ／Ｉ´´）である。Ｌ１＜Ｌ２であるから、したがって、図４で示すように、第１パネル部分１２ａ１における吸光度Ｅ１は、第２パネル部分１２ａ２における吸光度Ｅ２よりも大きくなる。このことから、第２パネル部分１２ａ２の透過光の強度Ｉ´´は、第１パネル部分１２ａ１の透過光の強度Ｉ´より小さくなる。このことは、横方向に隣接するパネル部分１２ａの距離が近づくに従い、透過光の強度が小さくなり、両パネル部分１２ａが最接近する箇所では、透過光の強度が最小となるので、ドーム状のフロントパネル１２が横方向に並設されても、そのことにより、フロントパネル１２の横方向隣接間で発光光が明るすぎることがなくなり、フロントパネル１２全体の発光輝度を均一化することができる。   Referring to FIG. 3, among the panel portions 12a on the side adjacent to each other between the front panels 12 adjacent in the lateral direction, the panel portion 12a having the panel height H1 is defined as a first panel portion 12a1 having a thickness L1. About the panel part 12a of height H2, the thickness is set to L2 as the 2nd panel part 12a2. The intensity of the incident light to the first panel portion 12a1 is Io, the intensity of the transmitted light is I ', the intensity of the incident light to the second panel portion 12a2 is Io, and the intensity of the transmitted light is I ″ by the light emission of the phosphor 14b. And Then, according to Lambert's law, the absorbance E1 of the first panel portion 12a1 is log (Io / I ′), and the absorbance E2 of the second panel portion 12a2 is log (Io / I ″). Since L1 <L2, therefore, as shown in FIG. 4, the absorbance E1 in the first panel portion 12a1 is larger than the absorbance E2 in the second panel portion 12a2. From this, the intensity I ″ of the transmitted light of the second panel portion 12a2 is smaller than the intensity I ′ of the transmitted light of the first panel portion 12a1. This is because the intensity of the transmitted light decreases as the distance between the panel parts 12a adjacent in the lateral direction decreases, and the intensity of the transmitted light is minimized at the point where the panel parts 12a are closest to each other. Even if the front panels 12 are arranged side by side in the horizontal direction, the emitted light does not become too bright between the horizontal adjacent areas of the front panel 12, and the light emission luminance of the entire front panel 12 can be made uniform.

実施の形態に係るフィールドエミッション型面状光源の断面図である。It is sectional drawing of the field emission type planar light source which concerns on embodiment. 実施の形態に係るフィールドエミッション型面状光源の平面図である。It is a top view of the field emission type planar light source concerning an embodiment. 図１のフィールドエミッション型面状光源の要部の拡大断面図である。It is an expanded sectional view of the principal part of the field emission type planar light source of FIG. 図１のフィールドエミッション型面状光源におけるパネル厚さと吸光度との関係を示す図である。It is a figure which shows the relationship between the panel thickness and the light absorbency in the field emission type planar light source of FIG.

符号の説明Explanation of symbols

１０ フィールドエミッション型面状光源
１２ フロントパネル
１２ａ パネル部分
１２ａ１ パネル高さＨ１のパネル部分
１２ａ２ パネル高さＨ２のパネル部分
１４ 蛍光体付きアノード膜
１４ａ アノード膜
１４ｂ 蛍光体
１６ リアパネル
１８ ワイヤ状カソード
１８ａ 導電性ワイヤ
１８ｂ カーボン膜


DESCRIPTION OF SYMBOLS 10 Field emission type planar light source 12 Front panel 12a Panel part 12a1 Panel part with panel height H1 12a2 Panel part with panel height H2 14 Anode film with phosphor 14a Anode film 14b Phosphor 16 Rear panel 18 Wire cathode 18a Conductivity Wire 18b Carbon film


Claims (4)

各々奥行き方向に直行する平面における断面形状がドーム状をなす複数のドーム形状部分を奥行き方向に直行する方向である横方向に一体に並設するとともに奥行き方向に延ばして配置してフロントパネルを構成し、各ドーム形状部分に対応して一体のリアパネルを横方向に配置し、フロントパネルの各ドーム形状部分それぞれの内面に蛍光体付きアノード膜を設けるとともにリアパネルの各ドーム形状部分に対応する部分のそれぞれの内面側の横方向中央位置にワイヤ状カソードを奥行き方向に延ばして配置し、フロントパネルの各ドーム形状部分の厚さをリアパネルに近いほど厚くして吸光度を大きくした、ことを特徴とするフィールドエミッション型面状光源。 A plurality of dome-shaped parts each having a dome-shaped cross section in a plane perpendicular to the depth direction are arranged side by side in the horizontal direction, which is a direction perpendicular to the depth direction, and are arranged extending in the depth direction to constitute a front panel. In addition, an integrated rear panel is disposed in the horizontal direction corresponding to each dome-shaped portion, an anode film with a phosphor is provided on the inner surface of each dome-shaped portion of the front panel, and a portion corresponding to each dome-shaped portion of the rear panel is provided. A wire-like cathode is arranged extending in the depth direction at the center position in the lateral direction on each inner surface side, and the thickness of each dome-shaped portion of the front panel is increased as it is closer to the rear panel to increase the absorbance. Field emission type surface light source. 各々奥行き方向に直行する平面における断面形状がドーム状をなす複数のフロントパネルを奥行き方向に直行する方向である横方向に並設するとともに奥行き方向に延ばして配置し、各フロントパネルに対応して複数のリアパネルを横方向に配置し、各フロントパネルそれぞれの内面に蛍光体付きアノード膜を設けるとともに各リアパネルそれぞれの内面側の横方向中央位置にワイヤ状カソードを奥行き方向に延ばして配置し、各フロントパネルの厚さをリアパネルに近いほど厚くして吸光度を大きくした、ことを特徴とするフィールドエミッション型面状光源。 A plurality of front panels each having a dome-like cross-sectional shape in a plane orthogonal to the depth direction are arranged side by side in the horizontal direction, which is a direction orthogonal to the depth direction, and extended in the depth direction, corresponding to each front panel. A plurality of rear panels are arranged in a horizontal direction, an anode film with a phosphor is provided on the inner surface of each front panel, and a wire-like cathode is arranged extending in the depth direction at a central position on the inner surface side of each rear panel. A field emission type surface light source characterized in that the thickness of the front panel is made closer to the rear panel to increase the absorbance. 各々奥行き方向に直行する平面における断面形状がドーム状をなす複数のドーム形状部分を奥行き方向に直行する方向である横方向に一体に並設するとともに奥行き方向に延ばして配置してフロントパネルを構成し、各ドーム形状部分に対応して複数のリアパネルを横方向に配置し、フロントパネルの各ドーム形状部分それぞれの内面に蛍光体付きアノード膜を設けるとともに各リアパネルそれぞれの内面側の横方向中央位置にワイヤ状カソードを奥行き方向に延ばして配置し、フロントパネルの各ドーム形状部分の厚さをリアパネルに近いほど厚くして吸光度を大きくした、ことを特徴とするフィールドエミッション型面状光源。 A plurality of dome-shaped parts each having a dome-shaped cross section in a plane perpendicular to the depth direction are arranged side by side in the horizontal direction, which is a direction perpendicular to the depth direction, and are arranged extending in the depth direction to constitute a front panel. A plurality of rear panels corresponding to each dome-shaped portion are arranged in the horizontal direction, and an anode film with a phosphor is provided on the inner surface of each dome-shaped portion of the front panel, and the center position in the horizontal direction on the inner surface side of each rear panel. A field emission type planar light source characterized in that a wire-like cathode is arranged extending in the depth direction, and the thickness of each dome-shaped portion of the front panel is increased as it is closer to the rear panel to increase the absorbance. 各々奥行き方向に直行する平面における断面形状がドーム状をなす複数のフロントパネルを奥行き方向に直行する方向である横方向に並設するとともに奥行き方向に延ばして配置し、各フロントパネルに対応して一体のリアパネルを横方向に配置し、各フロントパネルそれぞれの内面に蛍光体付きアノード膜を設けるとともにリアパネルの各フロントパネルに対応する部分のそれぞれの内面側の横方向中央位置にワイヤ状カソードを奥行き方向に延ばして配置し、各フロントパネルの厚さをリアパネルに近いほど厚くして吸光度を大きくした、ことを特徴とするフィールドエミッション型面状光源。 A plurality of front panels each having a dome-like cross-sectional shape in a plane orthogonal to the depth direction are arranged side by side in the horizontal direction, which is a direction orthogonal to the depth direction, and extended in the depth direction, corresponding to each front panel. An integrated rear panel is arranged in the horizontal direction, an anode film with a phosphor is provided on the inner surface of each front panel, and a wire-like cathode is formed at the center in the horizontal direction on the inner surface side of the portion corresponding to each front panel of the rear panel. A field emission type planar light source characterized in that it is arranged extending in the direction, and the thickness of each front panel is increased as it is closer to the rear panel to increase the absorbance.
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JPH0696732A (en) * 1992-09-10 1994-04-08 Sanyo Electric Co Ltd Flat fluorescent lamp
JP2005044616A (en) * 2003-07-22 2005-02-17 Shinichi Hirabayashi Field emission lamp
JP2006185686A (en) * 2004-12-27 2006-07-13 Yamato Denshi Kk Panel type light emission device

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0696732A (en) * 1992-09-10 1994-04-08 Sanyo Electric Co Ltd Flat fluorescent lamp
JP2005044616A (en) * 2003-07-22 2005-02-17 Shinichi Hirabayashi Field emission lamp
JP2006185686A (en) * 2004-12-27 2006-07-13 Yamato Denshi Kk Panel type light emission device

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