JPH05224199A - Liquid crystal display device - Google Patents
Liquid crystal display deviceInfo
- Publication number
- JPH05224199A JPH05224199A JP4026534A JP2653492A JPH05224199A JP H05224199 A JPH05224199 A JP H05224199A JP 4026534 A JP4026534 A JP 4026534A JP 2653492 A JP2653492 A JP 2653492A JP H05224199 A JPH05224199 A JP H05224199A
- Authority
- JP
- Japan
- Prior art keywords
- liquid crystal
- crystal panel
- holding frame
- ccft
- display device
- 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.)
- Granted
Links
- 239000004973 liquid crystal related substance Substances 0.000 title claims abstract description 64
- 239000002184 metal Substances 0.000 claims abstract description 13
- 239000000463 material Substances 0.000 claims abstract description 9
- 229920003023 plastic Polymers 0.000 abstract description 6
- 239000004033 plastic Substances 0.000 abstract description 6
- 230000003287 optical effect Effects 0.000 abstract description 4
- 238000002834 transmittance Methods 0.000 abstract description 4
- 238000009825 accumulation Methods 0.000 abstract 1
- 230000000694 effects Effects 0.000 description 3
- 229910001335 Galvanized steel Inorganic materials 0.000 description 2
- 229920000122 acrylonitrile butadiene styrene Polymers 0.000 description 2
- 239000008397 galvanized steel Substances 0.000 description 2
- 102100027340 Slit homolog 2 protein Human genes 0.000 description 1
- 101710133576 Slit homolog 2 protein Proteins 0.000 description 1
- 239000010960 cold rolled steel Substances 0.000 description 1
- 229920005668 polycarbonate resin Polymers 0.000 description 1
- 239000004431 polycarbonate resin Substances 0.000 description 1
- 230000000644 propagated effect Effects 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
Landscapes
- Devices For Indicating Variable Information By Combining Individual Elements (AREA)
- Liquid Crystal (AREA)
Abstract
(57)【要約】
【目的】熱伝導経路となっている押え枠にスリットの設
置あるいは熱伝導性の低い材質を採用するなどして液晶
パネルへの熱伝搬を抑えることにより液晶パネルに蓄積
される熱を軽減させ、液晶パネルの場所によるコントラ
スト，透過率などの光学特性の差異を無くし、表示品位
の均一な画質を提供する。
【構成】液晶パネル２は、押え枠１とエッヂライト方式
バックライト３に挟持される。ここでエッヂライト方式
バックライトは、ＣＣＦＴ３ａ，ＣＣＦＴホルダー３
ｂ，プラスチックフレーム３ｃ，導光体３ｄより構成さ
れる。この液晶パネル２及びＣＣＦＴ３ａに近接する金
属製の押え枠１にスリット１ａを設ける。あるいは押え
枠を熱伝導率の低い材質を採用する。
(57) [Abstract] [Purpose] Accumulation in the liquid crystal panel by suppressing heat transfer to the liquid crystal panel by installing slits in the holding frame that is the heat conduction path or using a material with low heat conductivity. The heat generated is reduced, the difference in optical characteristics such as contrast and transmittance depending on the location of the liquid crystal panel is eliminated, and image quality with uniform display quality is provided. [Structure] A liquid crystal panel 2 is sandwiched between a holding frame 1 and an edge light type backlight 3. Here, the edge light type backlight is CCFT 3a, CCFT holder 3
b, a plastic frame 3c, and a light guide 3d. A slit 1a is provided in the metal holding frame 1 near the liquid crystal panel 2 and the CCFT 3a. Alternatively, the holding frame is made of a material having low thermal conductivity.
Description
【０００１】[0001]
【産業上の利用分野】本発明は、液晶表示装置の構造及
び構造部品の材質に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of a liquid crystal display device and materials of structural parts.
【０００２】[0002]
【従来の技術】従来の液晶表示装置を図５，図６を用い
て説明する。図５は従来の液晶表示装置の平面図，図６
は従来の液晶表示装置の最たる特徴を示す部分の断面図
である。同図の押え枠、２は液晶パネル、３はエッヂラ
イト方式バックライトを示し、３の構成部品として３ａ
に冷陰極放電管は（以下ＣＣＦＴという），３ｂにＣＣ
ＦＴホルダー，３ｃにプラスチックフレーム，３ｄにＣ
ＣＦＴから発せられた光を拡散、伝搬する導光体を示
す。2. Description of the Related Art A conventional liquid crystal display device will be described with reference to FIGS. FIG. 5 is a plan view of a conventional liquid crystal display device, and FIG.
FIG. 4 is a sectional view of a portion showing the most characteristic feature of a conventional liquid crystal display device. In the same drawing, a holding frame, 2 is a liquid crystal panel, 3 is an edge light type backlight, and 3a is a component of 3
Cold cathode discharge tube (hereinafter CCFT), CC to 3b
FT holder, plastic frame on 3c, C on 3d
1 shows a light guide body that diffuses and propagates light emitted from a CFT.
【０００３】このように押え枠１と液晶パネル２及び押
え枠１とＣＣＦＴ３ａは近接している構造となってい
る。ここで押え枠１は液晶表示装置全体の薄型化あるい
はその強度を確保するために金属が用いられることが常
であった。As described above, the holding frame 1 and the liquid crystal panel 2 and the holding frame 1 and the CCFT 3a are arranged close to each other. Here, the holding frame 1 has always been made of metal in order to make the entire liquid crystal display device thinner or to secure its strength.
【０００４】[0004]
【発明が解決しようとする課題】しかしながら、上記従
来技術による液晶表示装置では、ＣＣＦＴより発せられ
た熱が金属である押え枠を経由して液晶パネルに伝搬さ
れる。液晶パネル自体は熱伝導性が低いために、液晶パ
ネルのＣＣＦＴ側に熱が蓄積されてしまい、同じ液晶パ
ネル内でもその温度が異なる場所が出来てしまう。この
装置で３０分間点灯放置しておいた時の液晶パネルのＣ
ＣＦＴ側とそれ以外の温度差△ｔは約８℃であった。液
晶パネル内に封入されている液晶は熱依存性が高いため
に、この温度差が８℃もあれば液晶自体の特性に差異を
生じ、ひいては液晶パネルのコントラスト，透過率など
光学特性に差異が生じてしまう。つまり液晶パネルのＣ
ＣＦＴ側とそれ以外の部分で、その表示品位が不均一な
画質になってしまうという欠点を有していた。However, in the above-mentioned liquid crystal display device according to the prior art, the heat generated from the CCFT is transmitted to the liquid crystal panel via the holding frame made of metal. Since the liquid crystal panel itself has low thermal conductivity, heat is accumulated on the CCFT side of the liquid crystal panel, and even in the same liquid crystal panel, there are places where the temperature is different. C of the liquid crystal panel when left on for 30 minutes with this device
The temperature difference Δt between the CFT side and the other side was about 8 ° C. Since the liquid crystal enclosed in the liquid crystal panel has a high thermal dependence, a difference in temperature of 8 ° C. causes a difference in the characteristics of the liquid crystal itself, which in turn causes a difference in the optical characteristics such as contrast and transmittance of the liquid crystal panel. Will occur. That is, C of the liquid crystal panel
There is a drawback that the display quality becomes non-uniform on the CFT side and other portions.
【０００５】そこで、本発明は上記欠点を解決するため
に、熱伝導経路となっている押え枠にスリットの設置あ
るいは熱伝導性の低い材質を採用するなどして、液晶パ
ネルへの熱伝搬を抑えるものである。Therefore, in order to solve the above-mentioned drawbacks, the present invention prevents the heat from being propagated to the liquid crystal panel by installing slits or adopting a material having low heat conductivity in the holding frame which is the heat conduction path. It is to suppress.
【０００６】その目的とするところは、液晶パネルの場
所によるコントラスト，透過率などの光学特性の差異を
無くし、表示品位の均一な画質を提供するものである。The object of the invention is to eliminate the difference in optical characteristics such as contrast and transmittance depending on the location of the liquid crystal panel and to provide an image quality with uniform display quality.
【０００７】[0007]
【課題を解決するための手段】本発明の液晶表示装置
は、エッヂライト方式バックライトと押え枠とで液晶パ
ネルを挟持し、且つエッヂライト方式バックライトの主
たる構成部品であるＣＣＦＴが金属製押え枠と近接して
いる構造を持つ液晶表示装置において、押え枠のＣＣＦ
Ｔと液晶パネルとに近接する部分に、スリットを設けた
ことを特徴とする。In the liquid crystal display device of the present invention, a liquid crystal panel is sandwiched between an edge light type backlight and a holding frame, and a CCFT, which is a main component of the edge light type backlight, is made of metal. In the liquid crystal display device having a structure close to the frame, the CCF of the holding frame
It is characterized in that a slit is provided in a portion close to T and the liquid crystal panel.
【０００８】[0008]
（実施例１）以下本発明の実施例１を図１，図２を用い
て説明する。図１は本発明の実施例１の平面図，図２は
本発明の実施例１の最たる特徴を示す部分の断面図であ
る。１は金属製（例えば亜鉛メッキ鋼板）の押え枠、１
ａは金属製の押え枠１に設けられたスリット、２は液晶
パネル、３はエッヂライト方式バックライトを示し、こ
のバックライトの構成部品として３ａがＣＣＦＴ，３ｂ
がＣＣＦＴホルダー，３ｃがプラスチックフレーム，３
ｄが導光体を示す。(Embodiment 1) Hereinafter, Embodiment 1 of the present invention will be described with reference to FIGS. 1 is a plan view of a first embodiment of the present invention, and FIG. 2 is a sectional view of a portion showing the most characteristic feature of the first embodiment of the present invention. 1 is a metal holding frame (for example, a galvanized steel plate), 1
a is a slit provided in the metal holding frame 1, 2 is a liquid crystal panel, 3 is an edge light type backlight, and 3a is a CCFT, 3b as a component of this backlight.
Is a CCFT holder, 3c is a plastic frame, 3
d shows a light guide.
【０００９】本実施例１におけるスリット１ａは幅１ｍ
ｍ，長さ１５０ｍｍである。また液晶パネルの画素部の
高さ寸法（液晶パネル２の短辺方向における両端に位置
する画素間の寸法をいう）は１４４ｍｍであり、液晶パ
ネルの画素部の高さ寸法に対しスリット長さの占める割
合は約１０４％となっている。The slit 1a in the first embodiment has a width of 1 m.
m, length 150 mm. Further, the height dimension of the pixel portion of the liquid crystal panel (referred to as the dimension between pixels located at both ends in the short side direction of the liquid crystal panel 2) is 144 mm, which is the slit length relative to the height dimension of the pixel portion of the liquid crystal panel. The ratio is about 104%.
【００１０】この状態で３０分間点灯放置しておいた時
の液晶パネル２のＣＣＦＴ３ａ側とそれ以外の部分（液
晶パネル２の中央部）での温度差△ｔは約３℃となっ
た。In this state, the temperature difference Δt between the CCFT 3a side of the liquid crystal panel 2 and the other portion (the central portion of the liquid crystal panel 2) when left to stand for 30 minutes was about 3 ° C.
【００１１】（実施例２）次に本発明の実施例２を図３
を用いて説明する。１は金属製の押え枠、１ａは金属製
の押え枠１に設けられたスリット、２は液晶パネル、３
ａはＣＣＦＴを示す。(Second Embodiment) Next, a second embodiment of the present invention will be described with reference to FIG.
Will be explained. 1 is a metal holding frame, 1a is a slit provided in the metal holding frame 1, 2 is a liquid crystal panel, 3
a shows CCFT.
【００１２】本実施例２におけるスリット１ａは幅１ｍ
ｍ，長さ４５ｍｍのものをスリット長手方向に３個並べ
たものである。またそれぞれのスリットの間隔は５ｍｍ
である。この場合のスリットの合計長さは１３５ｍｍと
なり、本実施例の液晶パネルの画素部の高さ寸法は１４
４ｍｍであるため、液晶パネルの画素部の高さ寸法に対
しスリット長さの占める割合は約９４％となっている。The slit 1a in the second embodiment has a width of 1 m.
In this example, three pieces having a length of m and a length of 45 mm are arranged in the longitudinal direction of the slit. The distance between each slit is 5 mm
Is. In this case, the total length of the slits is 135 mm, and the height dimension of the pixel portion of the liquid crystal panel of this embodiment is 14 mm.
Since it is 4 mm, the ratio of the slit length to the height dimension of the pixel portion of the liquid crystal panel is about 94%.
【００１３】この状態で３０分間点灯放置しておいた時
の液晶パネル２のＣＣＦＴ３ａ側とそれ以外の部分（液
晶パネル２の中央部）での温度差△ｔは約４℃となっ
た。In this state, the temperature difference Δt between the CCFT 3a side of the liquid crystal panel 2 and the other portion (the central portion of the liquid crystal panel 2) when left to stand for 30 minutes was about 4 ° C.
【００１４】（実施例３）次に本発明の実施例３を図４
を用いて説明する。１は金属製の押え枠、１ａは金属製
の押え枠１に設けられたスリット、２は液晶パネル、３
ａはＣＣＦＴを示す。(Third Embodiment) Next, a third embodiment of the present invention will be described with reference to FIG.
Will be explained. 1 is a metal holding frame, 1a is a slit provided in the metal holding frame 1, 2 is a liquid crystal panel, 3
a shows CCFT.
【００１５】本実施例３ではＣＣＦＴ３ａが左右両側に
設置されている。この場合スリット１ａも液晶パネル２
の左右に必要となる。それぞれのスリット１ａは幅１ｍ
ｍ，長さ１５０ｍｍである。また液晶パネルの画素部の
高さ寸法は１４４ｍｍであるため、液晶パネルの画素部
の高さ寸法に対しスリット長さの占める割合は約１０４
％となっている。In the third embodiment, CCFTs 3a are installed on both left and right sides. In this case, the slit 1a is also the liquid crystal panel 2
It is needed on the left and right of. Each slit 1a is 1m wide
m, length 150 mm. Since the height of the pixel portion of the liquid crystal panel is 144 mm, the ratio of the slit length to the height of the pixel portion of the liquid crystal panel is about 104.
%.
【００１６】この状態で３０分間点灯放置しておいた時
の液晶パネル２のＣＣＦＴ３ａ側とそれ以外の部分（液
晶パネル２の中央部）での温度差△ｔは約３℃となっ
た。In this state, the temperature difference Δt between the CCFT 3a side of the liquid crystal panel 2 and the other portion (the central portion of the liquid crystal panel 2) when left to stand for 30 minutes was about 3 ° C.
【００１７】以上のようにそのスリット１ａの数は１個
に限定されるものではない。またＣＣＦＴ３ａが設置さ
れる位置は上下左右の４方向全てに考えられるものであ
るためスリット１ａもそれぞれに対応して設置すること
が望ましい。As described above, the number of slits 1a is not limited to one. Further, since the positions where the CCFTs 3a are installed can be considered in all four directions of up, down, left and right, it is desirable to install the slits 1a correspondingly.
【００１８】なお、液晶パネルの画素部の高さ寸法に対
するスリット長さの占める割合は８０％以上が望まし
く、８０％未満であると熱の伝搬を抑える効果が低下す
る。また、金属製の押え枠１の材質としては、実施例１
で述べた亜鉛メッキ鋼板の他、冷延鋼板（ＳＰＣＣ−Ｓ
Ｄ）、ステンレス材を用いても同様の効果が得られる。 （実施例４）次に本発明の実施例４を説明する。いまま
で述べてきた実施例１から実施例３までは押え枠の材質
が金属である場合についてのものであったが、実施例４
においては押え枠を熱伝導性の低い材質例えばＡＢＳ樹
脂等のプラスチックにした。この場合ＣＣＦＴより発せ
られた熱はプラスチックからなる押え枠に伝わるものの
熱伝導性が低いために液晶パネルに伝わる熱を抑えるこ
とができる。上記ＡＢＳ樹脂の他にもポリカーボネート
樹脂やＡＣＳ樹脂が使用できる。The ratio of the slit length to the height dimension of the pixel portion of the liquid crystal panel is preferably 80% or more, and if it is less than 80%, the effect of suppressing heat transfer is reduced. In addition, as the material of the metal holding frame 1, the first embodiment is used.
In addition to the galvanized steel sheet described in 1., cold rolled steel sheet (SPCC-S
The same effect can be obtained by using D) and a stainless material. (Fourth Embodiment) Next, a fourth embodiment of the present invention will be described. While the first to third embodiments described so far are about the case where the material of the holding frame is metal, the fourth embodiment is described.
In the above, the holding frame is made of a material having low thermal conductivity, for example, plastic such as ABS resin. In this case, the heat generated from the CCFT is transferred to the holding frame made of plastic, but the heat transfer to the liquid crystal panel can be suppressed because the heat conductivity is low. In addition to the ABS resin, polycarbonate resin or ACS resin can be used.
【００１９】[0019]
【発明の効果】以上述べた如く本実施例によれば、ＣＣ
ＦＴから発せられる熱が押え枠を経由して液晶パネルに
伝搬されにくくなり、液晶パネルのＣＣＦＴ側に蓄積さ
れる熱は抑えられ、３０分間点灯放置しておいた時の液
晶パネルのＣＣＦＴ側とそれ以外の温度差△ｔは約３〜
５℃となる。このレベルの温度差であっても液晶自体の
特性に差異を生じるが、実用レベルとしてとらえると、
目視において液晶パネルのコントラスト，透過率など光
学特性に差異は認められず、表示品位の均一な画質を提
供することができるという優れた効果を有する。As described above, according to this embodiment, the CC
The heat generated from the FT is less likely to be transmitted to the liquid crystal panel via the holding frame, the heat accumulated on the CCFT side of the liquid crystal panel is suppressed, and the heat generated by the FT is different from the CCFT side of the liquid crystal panel when left to stand for 30 minutes. Other temperature difference Δt is about 3 ~
It becomes 5 ° C. Even with this level of temperature difference, there will be differences in the characteristics of the liquid crystal itself, but when viewed as a practical level,
There is no discernible difference in optical characteristics such as contrast and transmittance of the liquid crystal panel visually, and it has an excellent effect that it is possible to provide image quality with uniform display quality.
【図１】本発明の実施例１を示す平面図。FIG. 1 is a plan view showing a first embodiment of the present invention.
【図２】本発明の実施例１を示す断面図。FIG. 2 is a cross-sectional view showing the first embodiment of the present invention.
【図３】本発明の実施例２を示す平面図。FIG. 3 is a plan view showing a second embodiment of the present invention.
【図４】本発明の実施例３を示す平面図。FIG. 4 is a plan view showing a third embodiment of the present invention.
【図５】従来の液晶表示装置を示す平面図。FIG. 5 is a plan view showing a conventional liquid crystal display device.
【図６】従来の液晶表示装置を示す断面図。FIG. 6 is a sectional view showing a conventional liquid crystal display device.
１ ．押え枠 １ａ．スリット ２ ．液晶パネル ３ａ．ＣＣＦＴ ３ｂ．ＣＣＦＴホルダー ３ｃ．プラスチックフレーム ３ｄ．導光体 1. Presser frame 1a. Slit 2. Liquid crystal panel 3a. CCFT 3b. CCFT holder 3c. Plastic frame 3d. Light guide
Claims (3)
で液晶パネルを挟持し、且つエッヂライト方式バックラ
イトの主たる構成部品であるＣＣＦＴが金属製押え枠と
近接している構造を持つ液晶表示装置において、押え枠
のＣＣＦＴと液晶パネルとに近接する部分に、スリット
を設けたことを特徴とする液晶表示装置。1. A liquid crystal display device having a structure in which a liquid crystal panel is sandwiched between an edge light type backlight and a holding frame, and a CCFT which is a main component of the edge light type backlight is close to a metal holding frame. 2. A liquid crystal display device, wherein a slit is provided in a portion of the holding frame close to the CCFT and the liquid crystal panel.
の合計が、ＣＣＦＴと平行に位置する液晶パネルの画素
の寸法に対し少なくとも８０％以上占めることを特徴と
する液晶表示装置。2. A liquid crystal display device, wherein the total length of the slits provided in the holding frame occupies at least 80% or more of the size of the pixel of the liquid crystal panel positioned parallel to the CCFT.
ることを特徴とする請求項１記載の液晶表示装置。3. The liquid crystal display device according to claim 1, wherein the holding frame is made of a material having low thermal conductivity.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP04026534A JP3108948B2 (en) | 1992-02-13 | 1992-02-13 | Liquid crystal display |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP04026534A JP3108948B2 (en) | 1992-02-13 | 1992-02-13 | Liquid crystal display |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH05224199A true JPH05224199A (en) | 1993-09-03 |
| JP3108948B2 JP3108948B2 (en) | 2000-11-13 |
Family
ID=12196160
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP04026534A Expired - Lifetime JP3108948B2 (en) | 1992-02-13 | 1992-02-13 | Liquid crystal display |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3108948B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5546203A (en) * | 1992-10-16 | 1996-08-13 | Sharp Kabushiki Kaisha | Liquid crystal display having a frame which does not transmit light source heat to the display |
-
1992
- 1992-02-13 JP JP04026534A patent/JP3108948B2/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5546203A (en) * | 1992-10-16 | 1996-08-13 | Sharp Kabushiki Kaisha | Liquid crystal display having a frame which does not transmit light source heat to the display |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3108948B2 (en) | 2000-11-13 |
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