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JP4878760B2 - Liquid crystal display - Google Patents
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JP4878760B2 - Liquid crystal display - Google Patents

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JP4878760B2
JP4878760B2 JP2005051789A JP2005051789A JP4878760B2 JP 4878760 B2 JP4878760 B2 JP 4878760B2 JP 2005051789 A JP2005051789 A JP 2005051789A JP 2005051789 A JP2005051789 A JP 2005051789A JP 4878760 B2 JP4878760 B2 JP 4878760B2
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substrate
liquid crystal
crystal display
light
guide body
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JP2006235387A (en
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祐一 岩間
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Rhythm Co Ltd
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Rhythm Watch Co Ltd
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Description

本発明は、バックライト構造を備えた液晶表示装置に関するものである。   The present invention relates to a liquid crystal display device having a backlight structure.

液晶表示装置のバックライト構造は、基板に液晶表示部を搭載し、その基板と液晶表示部との間にLED等の発光素子を設けて構成されている。また、基板と液晶表示部との間には、発光素子を囲むようにガイド体が設けられている。ガイド体によれば、基板と液晶表示部との間から発光素子の光が外部に洩れるのを防止することができる。また、ガイド体の内部においては、液晶表示部の明るさを十分に確保すべく、発光素子の光を効率よく反射する構成が必要とされる。この種の液晶表示装置は、特許文献1及び2にも開示されている。
実開昭63−54127号公報 特開平8−22003号公報
The backlight structure of a liquid crystal display device is configured by mounting a liquid crystal display unit on a substrate and providing a light emitting element such as an LED between the substrate and the liquid crystal display unit. In addition, a guide body is provided between the substrate and the liquid crystal display unit so as to surround the light emitting element. According to the guide body, it is possible to prevent light from the light emitting element from leaking outside between the substrate and the liquid crystal display unit. In addition, in the guide body, a configuration that efficiently reflects the light of the light emitting element is required in order to ensure sufficient brightness of the liquid crystal display unit. This type of liquid crystal display device is also disclosed in Patent Documents 1 and 2.
Japanese Utility Model Publication No. 63-54127 JP-A-8-22003

さて、ガイド体の内部には、発光素子の光を反射するための光反射部が設けられるところ、基板の表面にどのような光反射部を設けるかが、液晶表示装置の性能、及び基板の製造性に係る重要な課題とされる。特に、光透過性を有する素材からなる基板の場合は、その表面に光を反射するための白シルク印刷を施しても、ある程度の光が基板を透過してしまうという問題がある。本発明は、かかる事情に鑑みてなされたものであり、その目的は、発光素子の光を反射する光反射部を合理的に設けてなる液晶表示装置を得ることである。   Now, inside the guide body, a light reflecting portion for reflecting the light of the light emitting element is provided. What kind of light reflecting portion is provided on the surface of the substrate depends on the performance of the liquid crystal display device and the substrate. This is an important issue related to manufacturability. In particular, in the case of a substrate made of a light-transmitting material, there is a problem that a certain amount of light is transmitted through the substrate even if white silk printing is performed on the surface to reflect light. The present invention has been made in view of such circumstances, and an object of the present invention is to obtain a liquid crystal display device in which a light reflecting portion that reflects light from a light emitting element is rationally provided.

本願第1請求項に記載した発明は、基板と、前記基板に対して設けられた液晶表示部と、前記基板と前記液晶表示部との間に設けられた発光素子と、前記発光素子を囲むように前記基板と前記液晶表示部との間に設けられたガイド体とを備えた液晶表示装置において、前記発光素子は、前記基板に搭載されたLEDであり、前記基板の平坦な面に列設されており、前記ガイド体は、前記基板に固定されるとともに前記液晶表示部を保持する枠体であり、その内面には、前記液晶表示部に向かって当該ガイド体の内部空間を拡大するテーパー面が設けられており、前記テーパー面は、前記発光素子の光を反射する反射面となっており、前記基板は、絶縁材料からなる板材の面に導体箔を形成し、前記導体箔にエッチング加工を施して回路パターンを設けたものであり、前記ガイド体の内側に面する前記基板の表面には、前記回路パターンにメッキを施してなる金属製の光反射部を設け、前記光反射部は、前記発光素子と前記発光素子との間を横切る部分を有して前記ガイド体の内側に面する前記基板の表面の30パーセント以上を占めるものであり、前記ガイド体の前記テーパー面により形成される反射面と前記基板の表面に設けられた前記金属製の光反射部とによって、前記LEDの光を反射し、且つ、前記基板の表面に設けられた前記金属製の光反射部によって、前記ガイド体の内部の光が前記基板を透過して外部に洩れるのを防止するようにした構成の液晶表示装置である。 The invention described in claim 1 of the present application surrounds a substrate, a liquid crystal display unit provided for the substrate, a light emitting element provided between the substrate and the liquid crystal display unit, and the light emitting element. Thus, in the liquid crystal display device including the guide body provided between the substrate and the liquid crystal display unit, the light emitting element is an LED mounted on the substrate, and is arranged on a flat surface of the substrate. The guide body is a frame body that is fixed to the substrate and holds the liquid crystal display unit, and the inner surface of the guide body expands toward the liquid crystal display unit. A tapered surface is provided, the tapered surface is a reflecting surface that reflects the light of the light emitting element, and the substrate is formed with a conductive foil on a surface of a plate made of an insulating material, and the conductive foil is formed on the conductive foil. Etching and circuit pattern Are those of provided on the surface of the substrate facing the inside of the guide body, the circuit pattern on the metal of the light reflecting portion is provided comprising plated, the light reflecting portion, and the light emitting element It occupies 30% or more of the surface of the substrate facing the inside of the guide body with a portion crossing between the light emitting elements, and the reflective surface formed by the tapered surface of the guide body, The LED light is reflected by the metal light reflecting portion provided on the surface of the substrate, and the inside of the guide body is reflected by the metal light reflecting portion provided on the surface of the substrate. In this liquid crystal display device, light is prevented from passing through the substrate and leaking outside .

本発明によれば、発光素子の光を反射する光反射部を合理的に設けてなる液晶表示装置を得ることができる。   According to the present invention, it is possible to obtain a liquid crystal display device that is rationally provided with a light reflecting portion that reflects the light of the light emitting element.

以下に、本発明の実施例を図面に基づいて説明する。図1及び図2に示す液晶表示装置1は、基板10と、基板10に対して設けられた液晶表示部20と、基板10と液晶表示部20との間に設けられた発光素子30と、発光素子30を囲むように基板10と液晶表示部20との間に設けられたガイド体40とを備えたものである。本例の発光素子30は、基板10に搭載されたLEDである。   Embodiments of the present invention will be described below with reference to the drawings. A liquid crystal display device 1 shown in FIG. 1 and FIG. 2 includes a substrate 10, a liquid crystal display unit 20 provided for the substrate 10, a light emitting element 30 provided between the substrate 10 and the liquid crystal display unit 20, A guide body 40 provided between the substrate 10 and the liquid crystal display unit 20 so as to surround the light emitting element 30 is provided. The light emitting element 30 of this example is an LED mounted on the substrate 10.

液晶表示部20は、液晶体及び透明電極からなる液晶表示素子を透明板の間に設け、透明電極と電気的に接続されたピン状の端子21から電気信号を入力することにより、所定の画素又はセグメント毎に透明・非透明状態が切換えられる構成となっている。端子21の先端は、基板10に半田付け、又は基板10に設けられた電極ソケットに接続されているものとする。液晶表示部20の発光素子30側の面には、発光素子30の光を乱反射する乱反射手段22が設けられている。乱反射手段22は、液晶表示部20における表示箇所全体の明るさを均等化するためのものであり、本例では、光を拡散する粒子を混入した透明樹脂製の板部材を採用している。   The liquid crystal display unit 20 is provided with a liquid crystal display element composed of a liquid crystal body and a transparent electrode between transparent plates, and inputs an electric signal from a pin-shaped terminal 21 electrically connected to the transparent electrode, whereby a predetermined pixel or segment It is configured to switch between transparent and non-transparent states every time. The tip of the terminal 21 is soldered to the substrate 10 or connected to an electrode socket provided on the substrate 10. On the surface of the liquid crystal display unit 20 on the light emitting element 30 side, irregular reflection means 22 for irregularly reflecting the light of the light emitting element 30 is provided. The irregular reflection means 22 is for equalizing the brightness of the entire display location in the liquid crystal display unit 20, and in this example, a transparent resin plate member mixed with light diffusing particles is employed.

ガイド体40は、基板10に固定されるとともに液晶表示部20を保持する樹脂製の枠体であり、その内側には、液晶表示部20に向かってガイド体40の内部空間を拡大するテーパー面41が設けられている。テーパー面41は、発光素子30の光を反射する面となっている。基板10に対するガイド体40の固定方法、及びガイド体40に対する液晶表示部20の保持方法は、特に限定はしない。例えば、ガイド体40の適宜部位にフック部を設けるとともに基板10の要所に孔部を設け、そのフック部を孔部に係止することにより、ガイド体40を基板に固定することが可能である。また、ガイド体40の要所に液晶表示部20を保持する係止片を適宜間隔で設け、それらの係止片にて液晶表示部20保持することが可能である。   The guide body 40 is a resin frame that is fixed to the substrate 10 and holds the liquid crystal display unit 20, and a taper surface that expands the internal space of the guide body 40 toward the liquid crystal display unit 20 on the inner side. 41 is provided. The tapered surface 41 is a surface that reflects the light of the light emitting element 30. The method for fixing the guide body 40 to the substrate 10 and the method for holding the liquid crystal display unit 20 with respect to the guide body 40 are not particularly limited. For example, it is possible to fix the guide body 40 to the substrate by providing a hook portion at an appropriate portion of the guide body 40 and providing a hole portion at an important point of the substrate 10 and locking the hook portion to the hole portion. is there. In addition, locking pieces for holding the liquid crystal display unit 20 can be provided at appropriate intervals at important points of the guide body 40, and the liquid crystal display unit 20 can be held by these locking pieces.

図3及び図4に示す本例の基板10は、ガラス粒子を混入したエポキシ樹脂等の絶縁材料からなる板材に、所定の回路パターン11を設けてなるものである。回路パターン11は、板材の両面に導体箔を形成し、その導体箔にエッチング加工を施して設けられている。所要の電子素子は、回路パターンに設けられたランドに接続されている。本例の場合、電子素子たる発光素子30は、液晶表示部20の形状に応じて適宜ピッチで基板上に列設されている。   A substrate 10 of this example shown in FIGS. 3 and 4 is obtained by providing a predetermined circuit pattern 11 on a plate material made of an insulating material such as an epoxy resin mixed with glass particles. The circuit pattern 11 is provided by forming a conductive foil on both surfaces of a plate material and etching the conductive foil. Necessary electronic elements are connected to lands provided in the circuit pattern. In the case of this example, the light emitting elements 30 as electronic elements are arranged on the substrate at an appropriate pitch according to the shape of the liquid crystal display unit 20.

図3中の破線は、ガイド体40の内側に面する基板10の表面10aを示している。図4に示すように、ガイド体40の内側に面する基板10の表面10aには、発光素子30の光を反射する光反射部12を設けている。この光反射部12は、基板10の回路パターン11に半田メッキを施してなるものである。光反射部12の表面は、銀色の光沢を有する。基板10の表面全体は、ランド及び光反射部12を残し、絶縁材料にてコーティングされている。   A broken line in FIG. 3 indicates the surface 10 a of the substrate 10 facing the inside of the guide body 40. As shown in FIG. 4, a light reflecting portion 12 that reflects light from the light emitting element 30 is provided on the surface 10 a of the substrate 10 facing the inside of the guide body 40. The light reflecting portion 12 is formed by performing solder plating on the circuit pattern 11 of the substrate 10. The surface of the light reflecting portion 12 has a silvery gloss. The entire surface of the substrate 10 is coated with an insulating material, leaving lands and light reflecting portions 12.

このような光反射部12を設けることによれば、液晶表示部20の明るさを向上することができる。すなわち、光反射部12が金属製であることから、基板10を透過して光が外部に洩れるのを確実に防止することができる。特に、光を反射すべく基板10の表面10aに白シルク印刷を施す場合と比較すると、透過による光の洩れが少ないという点で有利である。白シルク印刷は省略することができる。   By providing such a light reflection part 12, the brightness of the liquid crystal display part 20 can be improved. That is, since the light reflecting portion 12 is made of metal, it is possible to reliably prevent light from leaking outside through the substrate 10. In particular, it is advantageous in that light leakage due to transmission is small as compared with the case where white silk printing is applied to the surface 10a of the substrate 10 to reflect light. White silk printing can be omitted.

更に、本例の場合、光反射部12は、ガイド体40の内側に面する基板10の表面10aの30パーセント以上を占める構成となっている。より望ましくは、50パーセント以上である。例えば図5は、回路パターン11を従来と同様に形成した場合を示している。本発明によれば、図5に示すような回路パターン11に光反射部12を設けてもよいのであるが、十分な効果が得られない場合も考えられる。これに対し、本例の回路パターン11の形状は、図5と比較すると、光反射部12の面積を十分に確保するように設計されていることが分る。つまり、光反射部12を設けることを想定せずに回路パターン11の形状を設定すると、光反射部12の面積が30パーセント未満となる場合があるところ、本例では、光反射部12の面積を十分に確保すべく、回路パターン11の形状を設定している。   Further, in the case of this example, the light reflecting portion 12 is configured to occupy 30% or more of the surface 10 a of the substrate 10 facing the inside of the guide body 40. More desirably, it is 50 percent or more. For example, FIG. 5 shows a case where the circuit pattern 11 is formed in the same manner as in the prior art. According to the present invention, the light reflecting portion 12 may be provided on the circuit pattern 11 as shown in FIG. 5, but there may be a case where a sufficient effect cannot be obtained. On the other hand, it can be seen that the shape of the circuit pattern 11 of this example is designed so as to ensure a sufficient area of the light reflecting portion 12 as compared with FIG. That is, when the shape of the circuit pattern 11 is set without assuming that the light reflecting portion 12 is provided, the area of the light reflecting portion 12 may be less than 30%. In this example, the area of the light reflecting portion 12 is set. The shape of the circuit pattern 11 is set so as to ensure sufficient.

このように、本例によれば、光の反射性に優れた光反射部を合理的に設けてなる液晶表示装置を得ることができる。尚、本例における各部の構成は、特許請求の範囲に記載した技術的範囲において適宜に設計変更が可能であり、図例説明したものに限定されないことは勿論である。   Thus, according to this example, it is possible to obtain a liquid crystal display device in which a light reflecting portion excellent in light reflectivity is rationally provided. In addition, it is needless to say that the configuration of each part in the present example can be appropriately changed in design within the technical scope described in the claims, and is not limited to that illustrated in the drawings.

本発明は、バックライト構造を備えた液晶表示装置に関するものであり、例えば時計の時刻表示手段として好適に利用することができる。   The present invention relates to a liquid crystal display device having a backlight structure, and can be suitably used, for example, as time display means for a clock.

本発明の実施例に係り、液晶表示装置を示す正面図である。1 is a front view illustrating a liquid crystal display device according to an embodiment of the present invention. 本発明の実施例に係り、液晶表示装置を示す断面図(図1のX−X断面図)である。It is sectional drawing (XX sectional drawing of FIG. 1) which concerns on the Example of this invention and shows a liquid crystal display device. 本発明の実施例に係り、基板を示す正面図である。It is a front view which concerns on the Example of this invention and shows a board | substrate. 本発明の実施例に係り、基板の要部を示す正面図である。It is a front view which concerns on the Example of this invention and shows the principal part of a board | substrate. 本発明の実施例に係り、基板の要部を示す正面図である。It is a front view which concerns on the Example of this invention and shows the principal part of a board | substrate.

符号の説明Explanation of symbols

1 液晶表示装置
10 基板
10a ガイド体の内側に面する基板の表面
11 回路パターン
12 光反射部
20 液晶表示部
21 端子
22 乱反射手段
30 発光素子
40 ガイド体
41 テーパー面
DESCRIPTION OF SYMBOLS 1 Liquid crystal display device 10 Board | substrate 10a The surface of the board | substrate which faces the inner side of a guide body 11 Circuit pattern 12 Light reflection part 20 Liquid crystal display part 21 Terminal 22 Diffuse reflection means 30 Light emitting element 40 Guide body 41 Tapered surface

Claims (1)

基板と、前記基板に対して設けられた液晶表示部と、前記基板と前記液晶表示部との間に設けられた発光素子と、前記発光素子を囲むように前記基板と前記液晶表示部との間に設けられたガイド体とを備えた液晶表示装置において、
前記発光素子は、前記基板に搭載されたLEDであり、前記基板の平坦な面に列設されており、
前記ガイド体は、前記基板に固定されるとともに前記液晶表示部を保持する枠体であり、その内面には、前記液晶表示部に向かって当該ガイド体の内部空間を拡大するテーパー面が設けられており、前記テーパー面は、前記発光素子の光を反射する反射面となっており、
前記基板は、絶縁材料からなる板材の面に導体箔を形成し、前記導体箔にエッチング加工を施して回路パターンを設けたものであり、
前記ガイド体の内側に面する前記基板の表面には、前記回路パターンにメッキを施してなる金属製の光反射部を設け、
前記光反射部は、前記発光素子と前記発光素子との間を横切る部分を有して前記ガイド体の内側に面する前記基板の表面の30パーセント以上を占めるものであり、
前記ガイド体の前記テーパー面により形成される反射面と前記基板の表面に設けられた前記金属製の光反射部とによって、前記LEDの光を反射し、且つ、前記基板の表面に設けられた前記金属製の光反射部によって、前記ガイド体の内部の光が前記基板を透過して外部に洩れるのを防止するようにしたことを特徴とする液晶表示装置。
A substrate, a liquid crystal display unit provided for the substrate, a light emitting element provided between the substrate and the liquid crystal display unit, and the substrate and the liquid crystal display unit so as to surround the light emitting element. In a liquid crystal display device including a guide body provided therebetween,
The light emitting elements are LEDs mounted on the substrate, and are arranged on a flat surface of the substrate,
The guide body is a frame body that is fixed to the substrate and holds the liquid crystal display unit, and a taper surface that expands an internal space of the guide body toward the liquid crystal display unit is provided on an inner surface thereof. The tapered surface is a reflective surface that reflects the light of the light emitting element,
The substrate is formed by forming a conductive foil on the surface of a plate made of an insulating material, and providing a circuit pattern by performing etching on the conductive foil,
Provided on the surface of the substrate facing the inside of the guide body is a metal light reflecting portion formed by plating the circuit pattern;
The light reflecting portion occupies 30% or more of the surface of the substrate facing the inner side of the guide body having a portion crossing between the light emitting element and the light emitting element ,
The light of the LED is reflected by the reflecting surface formed by the tapered surface of the guide body and the metallic light reflecting portion provided on the surface of the substrate, and provided on the surface of the substrate. The liquid crystal display device according to claim 1, wherein the metallic light reflecting portion prevents light inside the guide body from passing through the substrate and leaking outside .
JP2005051789A 2005-02-25 2005-02-25 Liquid crystal display Expired - Fee Related JP4878760B2 (en)

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KR101442006B1 (en) * 2008-06-05 2014-09-19 삼성디스플레이 주식회사 Backlight assembly and display device having same

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JPH0455086U (en) * 1990-09-14 1992-05-12
JPH10319392A (en) * 1997-05-15 1998-12-04 Mitsubishi Electric Corp Backlight device and liquid crystal display device
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