JPH0114055Y2 - - Google Patents
Info
- Publication number
- JPH0114055Y2 JPH0114055Y2 JP1982092573U JP9257382U JPH0114055Y2 JP H0114055 Y2 JPH0114055 Y2 JP H0114055Y2 JP 1982092573 U JP1982092573 U JP 1982092573U JP 9257382 U JP9257382 U JP 9257382U JP H0114055 Y2 JPH0114055 Y2 JP H0114055Y2
- Authority
- JP
- Japan
- Prior art keywords
- light
- display
- guide plate
- light guide
- recess
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- 239000003973 paint Substances 0.000 claims description 8
- 239000011148 porous material Substances 0.000 claims 1
- 238000005286 illumination Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000012780 transparent material Substances 0.000 description 1
Description
【考案の詳細な説明】
本考案は、自動車に設備される計器板を照明表
示する表示装置に関するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a display device for illuminating an instrument panel installed in an automobile.
第１図は従来のこの種の表示装置の一例を示す
もので、この表示装置１は、透明樹脂で形成され
た導光板２と、この導光板２の表面に重合貼着さ
れる表示板３とからなり、その表示板３は透明フ
イルム４の表面に文字、数字、記号等の表示部５
以外の部分に遮光塗料層６を施してなり、また前
記導光板２の裏面における表示部５と対応する位
置には、光源７からの光を表示部５へ反射導光せ
しめるための白色塗料層８が形成されている。し
かしながらこのようなものにあつては白色塗料層
８の印刷工程が必要となつて製品コストが高くな
る欠点があつた。かかる欠点を解消するため、第
２図に示すように前記の白色塗料層８にかえ、導
光板２の裏面に、いわゆるしぼ面と伝われている
微少凹凸面からなる光拡散面９を、その導光板２
の成形加工の際に一体に設けたものも提案されて
いるが、この導光板における光拡散面９により拡
散された光は、３次元的に広がるために実際に、
表示部５を照明させるために使用される光は一部
であつて照明度が不足するといつた欠点があつ
た。 FIG. 1 shows an example of a conventional display device of this type. This display device 1 includes a light guide plate 2 made of transparent resin, and a display plate 3 that is polymerized and adhered to the surface of the light guide plate 2. The display board 3 has a display section 5 of letters, numbers, symbols, etc. on the surface of a transparent film 4.
A light-shielding paint layer 6 is applied to the other parts, and a white paint layer is provided on the back surface of the light guide plate 2 at a position corresponding to the display part 5 for reflecting and guiding the light from the light source 7 to the display part 5. 8 is formed. However, such a product requires a printing process for the white paint layer 8, which increases the product cost. In order to eliminate this drawback, as shown in FIG. 2, instead of the white paint layer 8 described above, a light diffusing surface 9 consisting of a slightly uneven surface, which is known as a wrinkled surface, is provided on the back surface of the light guide plate 2. light plate 2
Although it has been proposed that the light guide plate is provided integrally during the molding process, the light diffused by the light diffusing surface 9 of this light guide plate spreads three-dimensionally, so in reality,
The light used to illuminate the display section 5 is only a portion of the light, and there is a drawback that the illumination intensity is insufficient.
本考案このような問題点に着目してなされたも
ので導光板の表面側に、光を表示部方向へ反射さ
せる反射面を形成することにより上記の欠点を解
消できる表示装置を提供することを目的とするも
のである。 The present invention has been made with attention to these problems, and an object of the present invention is to provide a display device that can eliminate the above-mentioned drawbacks by forming a reflective surface on the front side of the light guide plate to reflect light toward the display section. This is the purpose.
以下に本考案を第３図乃至第６図に示す実施例
に基いて詳細に説明する。 The present invention will be explained in detail below based on the embodiments shown in FIGS. 3 to 6.
実施例
第３図乃至第５図において、１１は光屈折率が
大である透明材料で形成された導光板、１２はこ
の導光板１１の表面に重合貼着される表示板であ
つて、この表示板１２は、従来例で述べたと同様
に、透明フイルム１３の表面に文字、数字、記号
等の表示部１４以外の部分に遮光塗料層１５を施
してなるものである。また前記導光板１１の表
面、即ち表示板１２の重合面の前記表示部１４の
対応位置に光反射面１６と光入射面１７とからな
る凹部１８を形成したものである。１９は導光板
１１の端面、２０はこの端面より光を入射させる
ための光源である。２１は導光板の表面を示す。Embodiment In FIGS. 3 to 5, 11 is a light guide plate made of a transparent material with a high optical refractive index, and 12 is a display plate that is polymerized and adhered to the surface of this light guide plate 11. The display board 12 is formed by applying a light-shielding paint layer 15 to the surface of a transparent film 13 other than the display portions 14 such as letters, numbers, and symbols, as described in the conventional example. Further, a recess 18 consisting of a light reflecting surface 16 and a light incident surface 17 is formed at a position corresponding to the display section 14 on the surface of the light guide plate 11, that is, the overlapping surface of the display panel 12. 19 is an end surface of the light guide plate 11, and 20 is a light source for inputting light from this end surface. 21 indicates the surface of the light guide plate.
以上が本実施例の構成であるが、次にその作用
について述べると、光源２０より発した光は導光
板１１の端面１９より、該導光板１１内に入射す
る。この時導光板１１の内部を伝つていく光線は
導光板１１と光源２０との距離あるいは端面１９
の形状等により異なるが第４図に示す入射角γは
一般的にθ0＜γ＜90゜であると考えられる（θ0は
臨界角でありθ0＝sin＋n0／n1n0；空気の屈折率、
n1；導光体の屈折率）。この時、光の入射面１７
に到達した光線のうち一部は第５図に示すように
直線表示部１４に至り残りは反射面１６で反射さ
れて（うち一部は反射面１６で屈折し再び導光板
１１を進んで行くがこの割合は反射面１６の傾き
α及び導光板１１の屈折率により異なる）、表示
部１４に至る。よつて表示部１４はこの光を拡散
透過せしめ表示装置としての機能を果す。この
時、光の入射面１７の傾き、大きさあるいは反射
面１６の傾きα等を入射面１７に到達する光の強
さに応じて変えることにより各表示部１４を均一
に光らせることができる。この時、光の取入れ形
状（反射面１６及び入射面１７により形成された
部分）に到達する光のうち反射面１６に至つたも
のは反射面１６に対しγ＋αの入射角で入射する
のでγが臨界角θ0に近い場合でも反射面１６では
全反射をし、さらにこの反射面１６で全反射した
光はγ＋2αの入射角で導光板の表面２１に至る。
よつてこの光の取入れ凹部１８に至つた光は入射
面１７を通り表示部１４に至るもの以外はほとん
ど全て導光板１２内を更に進み別の表示部１４を
光らせるのに寄与することになる。 The configuration of this embodiment has been described above. Next, the operation will be described. Light emitted from the light source 20 enters into the light guide plate 11 through the end surface 19 of the light guide plate 11. At this time, the light rays traveling inside the light guide plate 11 are determined by the distance between the light guide plate 11 and the light source 20 or by the distance between the light guide plate 11 and the light source 20 or the end face 19
Although it differs depending on the shape of refractive index, n 1 ; refractive index of the light guide). At this time, the light incident surface 17
As shown in FIG. 5, part of the light beams that reach the linear display section 14 reach the linear display section 14, and the rest are reflected by the reflective surface 16 (some of them are refracted by the reflective surface 16 and proceed through the light guide plate 11 again). However, this ratio varies depending on the inclination α of the reflective surface 16 and the refractive index of the light guide plate 11), and reaches the display section 14. Therefore, the display section 14 diffusely transmits this light and functions as a display device. At this time, each display section 14 can be illuminated uniformly by changing the inclination and size of the light incident surface 17 or the inclination α of the reflecting surface 16 depending on the intensity of light reaching the incident surface 17. At this time, among the light that reaches the light intake shape (the part formed by the reflective surface 16 and the incident surface 17), the light that reaches the reflective surface 16 is incident on the reflective surface 16 at an incident angle of γ + α, so that γ is Even when the critical angle is close to θ 0 , the light is totally reflected on the reflecting surface 16, and the light totally reflected on the reflecting surface 16 reaches the surface 21 of the light guide plate at an incident angle of γ+2α.
Therefore, almost all of the light that has reached the light intake recess 18, except for that which passes through the incident surface 17 and reaches the display section 14, further travels within the light guide plate 12 and contributes to illuminating another display section 14.
尚入射面１７に入射した光のうちこの反射面１
７で反射される光は無視できるごくわずかであ
る。 Of the light incident on the incident surface 17, this reflective surface 1
The light reflected at 7 is negligible.
実施例
第６図において、本実施例は、前記の実施例
における三角形状の凹部１８を四角形状の凹部１
８′にかえただけで、その他の構造は前記実施例
と同じである。即ち本実施例においては、導光板
１１の表面２１に対して直交しかつ対向する一対
の入射面２３ａ及び２３ｂと、この一対の入射面
相互間に形成されかつ表面２１と平行する反射面
２２とで形成される凹部１８′を、表示板１２に
形成した各表示部１４に対応させて設けたもので
ある。従つてこの実施例によれば双方の光源２
０，２０から入射面２３ａ又は２３ｂに至つた光
の一部は直接表示部１４に至り、他の一部は反射
面２２で屈折し、残りは反射して表示部１４ある
いは反対側の入射面２３ｂ又は２３ａに至り再び
導光板１１内を進む。又一部の光は入射面２３ａ
又は２３ｂより直接他の入射面２３ｂ又は２３ａ
に至り導光板１１内を進む。以上のように本実施
例では、導光板１１の両側に夫々の光源２０を配
設するものにおいて有効であり、これに対し前記
の実施例では、導光板１１の片側に光源２０を
配設するものにおいて有効である。Embodiment In FIG. 6, this embodiment replaces the triangular recess 18 in the previous embodiment with a square recess 1.
8', the other structure is the same as the previous embodiment. That is, in this embodiment, a pair of incident surfaces 23a and 23b are perpendicular to and opposite to the surface 21 of the light guide plate 11, and a reflective surface 22 is formed between the pair of incident surfaces and parallel to the surface 21. A recessed portion 18' formed in the above-mentioned shape is provided corresponding to each display portion 14 formed on the display panel 12. Therefore, according to this embodiment, both light sources 2
A part of the light that reaches the incident surface 23a or 23b from 0, 20 directly reaches the display section 14, another part is refracted by the reflective surface 22, and the rest is reflected and goes to the display section 14 or the opposite incident surface. It reaches 23b or 23a and moves inside the light guide plate 11 again. Also, some of the light enters the incident surface 23a.
Or another entrance surface 23b or 23a directly from 23b.
The light reaches the light guide plate 11 and advances inside the light guide plate 11. As described above, this embodiment is effective when the light sources 20 are disposed on both sides of the light guide plate 11, whereas in the above embodiment, the light sources 20 are disposed on one side of the light guide plate 11. It is effective in things.
以上のように本考案は、透光性材料からなるフ
イルム１３に、文字、数字、記号等の表示となる
表示部１４を除いて遮光塗料層１５を設けて、表
示板１２を形成し、該表示板１２の裏面に、光源
２０からの光を前記表示板１２の裏面に導く導光
板１１を重ね合せてなる表示装置において、前記
導光板１１の前記表示板１２との重合面に、前記
表示部１４と対応する位置に位置させて平坦な底
面及び側面からなる凹部１８又は１８′を設けて、
この凹部１８又は１８′の底面を反射面１６又は
２２、前記側面を光入射面１７，２３ａ，２３ｂ
とし、前記光源２０からの光が前記導光板１１を
通つて前記入射面１７，２３ａ，２３ｂから前記
凹部１８，１８′内に入射した後前記反射面１６
又は２２で反射して前記表示部１４を照明するよ
うにしたことを特徴とする表示装置であるから、
この表示装置によれば導光板内を導光されて表示
部１４を照明した他の光はその殆んどが、再度導
光板内を通つて他の表示部の照明に寄与すること
ができるので照明光の漏光がきわめて少なく照明
効率の高い表示装置が提供できる効果がある。 As described above, the present invention forms the display board 12 by providing the light-shielding paint layer 15 on the film 13 made of a translucent material, except for the display area 14 that displays characters, numbers, symbols, etc. In a display device in which a light guide plate 11 that guides light from a light source 20 to the back surface of the display plate 12 is superimposed on the back surface of the display plate 12, the display is placed on the surface of the light guide plate 11 that overlaps with the display plate 12. A recess 18 or 18' having a flat bottom and side surfaces is provided at a position corresponding to the part 14,
The bottom surface of this recess 18 or 18' is the reflecting surface 16 or 22, and the side surface is the light incident surface 17, 23a, 23b.
After the light from the light source 20 passes through the light guide plate 11 and enters the recesses 18, 18' from the incident surfaces 17, 23a, 23b,
Or, since the display device is characterized in that the display unit 14 is illuminated by reflection at 22,
According to this display device, most of the other light that is guided through the light guide plate and illuminates the display section 14 can pass through the light guide plate again and contribute to the illumination of other display sections. This has the effect of providing a display device with extremely low leakage of illumination light and high illumination efficiency.
第１図は従来の表示装置を示した断面図、第２
図は他の従来例を示した部分拡大断面図、第３図
は本考案よりなる表示装置の実施例を示した断面
図、第４図はその説明図、第５図は本実施例の要
部拡大断面図、第６図は本考案の他の実施例を示
した要部拡大断面図である。
１１……導光板、１２……表示板、１３……透
明フイルム、１４……表示部、１５……遮光塗料
層、１６，２２……光反射面、１７，２３ａ，２
３ｂ……光入射面、１８，１８′……凹部、１９
……端面、２０……光源、２１……導光板表面。
Figure 1 is a sectional view showing a conventional display device, Figure 2 is a sectional view showing a conventional display device.
The figure is a partially enlarged sectional view showing another conventional example, FIG. 3 is a sectional view showing an embodiment of the display device according to the present invention, FIG. 4 is an explanatory diagram thereof, and FIG. FIG. 6 is an enlarged sectional view of a main part showing another embodiment of the present invention. DESCRIPTION OF SYMBOLS 11... Light guide plate, 12... Display board, 13... Transparent film, 14... Display part, 15... Light shielding paint layer, 16, 22... Light reflecting surface, 17, 23a, 2
3b... Light incidence surface, 18, 18'... Concave portion, 19
... end face, 20 ... light source, 21 ... light guide plate surface.
Claims (1)
字、記号等の表示となる表示部１４を除いて遮光
塗料層１５を設けて、表示板１２を形成し、該表
示板１２の裏面に、光源２０からの光を前記表示
板１２の裏面に導く導光板１１を重ね合せてなる
表示装置において、前記導光板１１の前記表示板
１２との重合面に、前記表示部１４と対応する位
置に位置させて平坦な底面及び側面からなる凹部
１８又は１８′を設けて、この凹部１８又は１
８′の底面を反射面１６又は２２、前記側面を光
入射面１７，２３ａ，２３ｂとし、前記光源２０
からの光が前記導光板１１を通つて前記入射面１
７，２３ａ，２３ｂから前記凹部１８又は１８′
内に入射した後前記反射面１６又は２２で反射し
て前記表示部１４を照明するようにしたことを特
徴とする表示装置。 A display board 12 is formed by providing a light-shielding paint layer 15 on a film 13 made of a porous material except for a display area 14 that displays characters, numbers, symbols, etc., and a light source is provided on the back surface of the display board 12. In a display device in which light guide plates 11 that guide light from 20 to the back surface of the display plate 12 are stacked, a light guide plate 11 is positioned on a surface of the light guide plate 11 that overlaps with the display plate 12 at a position corresponding to the display section 14. A recess 18 or 18' having a flat bottom and side surfaces is provided, and this recess 18 or 1
8' is the reflective surface 16 or 22, the side surface is the light incident surface 17, 23a, 23b, and the light source 20
The light from the light guide plate 11 passes through the incident surface 1.
7, 23a, 23b to the recess 18 or 18'
1. A display device characterized in that the display unit 14 is illuminated by being reflected by the reflective surface 16 or 22 after entering the interior.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9257382U JPS58195279U (en) | 1982-06-21 | 1982-06-21 | display device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9257382U JPS58195279U (en) | 1982-06-21 | 1982-06-21 | display device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS58195279U JPS58195279U (en) | 1983-12-26 |
| JPH0114055Y2 true JPH0114055Y2 (en) | 1989-04-25 |
Family
ID=30222857
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9257382U Granted JPS58195279U (en) | 1982-06-21 | 1982-06-21 | display device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS58195279U (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4547734B2 (en) * | 1999-07-09 | 2010-09-22 | 日亜化学工業株式会社 | Self-luminous display board |
| US7555321B2 (en) * | 2003-08-07 | 2009-06-30 | Panasonic Corporation | Communication portable terminal device |
| JP4823636B2 (en) * | 2005-10-13 | 2011-11-24 | ハリソン東芝ライティング株式会社 | Lighting device |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4840771A (en) * | 1971-09-30 | 1973-06-15 | ||
| JPS56111882A (en) * | 1980-02-12 | 1981-09-03 | Koito Mfg Co Ltd | Display |
| JPS5718662U (en) * | 1980-07-02 | 1982-01-30 |
-
1982
- 1982-06-21 JP JP9257382U patent/JPS58195279U/en active Granted
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4840771A (en) * | 1971-09-30 | 1973-06-15 | ||
| JPS56111882A (en) * | 1980-02-12 | 1981-09-03 | Koito Mfg Co Ltd | Display |
| JPS5718662U (en) * | 1980-07-02 | 1982-01-30 |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS58195279U (en) | 1983-12-26 |
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