JP6594161B2

JP6594161B2 - Display device

Info

Publication number: JP6594161B2
Application number: JP2015214684A
Authority: JP
Inventors: 淳川田; 敦士森田
Original assignee: Canon Inc
Current assignee: Canon Inc
Priority date: 2014-11-19
Filing date: 2015-10-30
Publication date: 2019-10-23
Anticipated expiration: 2035-10-30
Also published as: JP2016105157A

Description

本発明は、表示装置に用いられる光学シートの保持構造に関する。 The present invention relates to a holding structure for an optical sheet used in a display device.

近年、画像表示装置に用いられる表示モジュールは、ＬＣＤ（Liquid Crystal Display）パネルとバックライトの光源としてＬＥＤ（Light Emitting Diode）を用いたＬＣＤモジュールが主流である。バックライトは、ＬＣＤパネルの背面に光源を配置した直下型と、ＬＣＤパネルの背面に導光板と導光板の側面に光源を配置したエッジライト型の構造が用いられている。また、いずれのバックライト構造においても、ＬＣＤパネルとＬＥＤ及び導光板の間に、拡散や集光を行う複数の光学シートを重ねて搭載し、輝度や均一性等の画質特性を向上させている。 In recent years, LCD modules using an LCD (Liquid Crystal Display) panel and an LED (Light Emitting Diode) as a light source of a backlight are mainly used as a display module for an image display device. The backlight uses a direct type in which a light source is arranged on the back surface of the LCD panel, and an edge light type structure in which a light source plate is arranged on the back surface of the LCD panel and a light source is arranged on the side surface of the light guide plate. In any backlight structure, a plurality of optical sheets for diffusing and collecting light are stacked between the LCD panel, the LED, and the light guide plate to improve image quality characteristics such as luminance and uniformity.

以下、従来技術の表示モジュールの構造及び光学シートの保持構造について説明する。
ＬＣＤパネルは、表示範囲の外側の周縁をパネルケースとパネルホルダにより挟持されて保持される。ＬＥＤ基板は、パネル側に開口を備える箱状のバックライトケースに収容されている。光学シートは、ＬＣＤパネルに対する照明範囲の外側の周縁を、正面側及び背面側からパネルホルダとバックライトケースにより狭持されて保持される。また、光学シートは、熱膨張した際に筐体に接触してシワが発生しないように、シート外形がパネルホルダの内壁に対して間隙を持って保持されている。この構造では、輸送の際の振動によってシート同士が擦れ、キズが付き表示異常が発生する可能性があった。このため、従来技術では、図１０に示す構造が提案されている。この構造では、光学シート１１０に係止穴１１０ａと、係止穴１１０ａと連続するスリット１１０ｂと、からなる位置決め形状を設け、バックライトケースに設けたピン１２０に係合させる(特許文献１参照)。 Hereinafter, the structure of the display module of the prior art and the holding structure of the optical sheet will be described.
The LCD panel is held by holding the outer periphery of the display range between a panel case and a panel holder. The LED substrate is accommodated in a box-shaped backlight case having an opening on the panel side. The optical sheet is held by holding the outer peripheral edge of the illumination range with respect to the LCD panel from the front side and the back side by the panel holder and the backlight case. In addition, the outer shape of the optical sheet is held with a gap with respect to the inner wall of the panel holder so that the optical sheet does not wrinkle due to contact with the housing when thermally expanded. In this structure, there is a possibility that the sheets are rubbed due to vibration during transportation, and the display is abnormal due to scratches. For this reason, the structure shown in FIG. 10 is proposed in the prior art. In this structure, the optical sheet 110 is provided with a positioning shape including a locking hole 110a and a slit 110b continuous with the locking hole 110a, and is engaged with a pin 120 provided in the backlight case (see Patent Document 1). .

特開２００５−２４２２７０号公報JP 2005-242270 A

特許文献１の構造では、光学シートが熱変形し、ピン１２０に対する係止穴１１０ａの位置ずれが発生しても、係止穴１１０ａ及びスリット１１０ｂからなる位置決め形状が変形することで、ガタの発生を抑制し、振動によってシート同士が擦れることを抑制する。
しかしながら、特許文献１の光学シートは、位置決め形状に力が加わり変形させる。そのため、繰り返しの変形により位置決め形状とピン係合にガタが生じる可能性や、位置決め形状の変形によりシワが発生し、変形が有効照明範囲にも及び、表示ムラが発生する可能性があった。 In the structure of Patent Document 1, even if the optical sheet is thermally deformed and the displacement of the locking hole 110a with respect to the pin 120 is generated, the positioning shape including the locking hole 110a and the slit 110b is deformed, thereby generating backlash. And the friction between the sheets due to vibration is suppressed.
However, the optical sheet of Patent Document 1 is deformed by applying a force to the positioning shape. For this reason, there is a possibility that the positioning shape and the pin engagement will be loose due to repeated deformation, or wrinkles will be generated due to the deformation of the positioning shape, and the deformation may reach the effective illumination range and display unevenness may occur.

そこで、本発明は、光学シートを有する表示装置において、振動によって光学シート同士が擦れることを抑制し、光学シートに熱変形が生じた場合でも光学シートにガタやシワが発生することを抑制することを目的とする。 Therefore, the present invention suppresses the optical sheets from rubbing against each other due to vibration in a display device having an optical sheet, and suppresses occurrence of backlash and wrinkles in the optical sheet even when the optical sheet is thermally deformed. With the goal.

本発明は、表示パネルと、
前記表示パネルを背面側から照明する光源ユニットと、
前記表示パネルと前記光源ユニットの間に配置される光学シートと、
前記表示パネルと前記光源ユニットと前記光学シートとを収容する筐体と、
を備え、
前記光学シートは、前記光学シートの４辺のうち少なくとも１つの支持辺に沿った領域に、１又は複数の孔部を備え、
前記４辺のうち前記支持辺と平行な他の辺と前記筐体との間に間隙が設けられ、
前記筐体は、前記孔部に係合し、前記支持辺に対して垂直の方向の前記光学シートの移動を制限する位置決め手段が設けられ、
前記光学シートは、前記４辺のうち前記他の辺に沿った領域に、前記位置決め手段と係合するための前記孔部を持たず、
前記光学シートは、前記支持辺に設けられた保持手段が前記筐体の内壁に接触した状態で保持され、
前記保持手段と前記筐体の内壁との間の摩擦抵抗は、前記光学シートの前記支持辺と前記筐体の内壁との間の摩擦抵抗より小さいことを特徴とする表示装置である。
また、本発明は、表示パネルと、
前記表示パネルを背面側から照明する光源ユニットと、
前記表示パネルと前記光源ユニットの間に配置される光学シートと、
前記表示パネルと前記光源ユニットと前記光学シートとを収容する筐体と、
を備え、
前記光学シートは、前記光学シートの４辺のうち少なくとも１つの支持辺に沿った領域に、１又は複数の孔部を備え、
前記４辺のうち前記支持辺と平行な他の辺と前記筐体との間に間隙が設けられ、
前記筐体には、前記孔部に係合し、前記支持辺に対して垂直の方向の前記光学シートの移動を制限する位置決め手段が設けられ、
前記光学シートは、前記４辺のうち前記他の辺に沿った領域に、前記位置決め手段と係合するための前記孔部を持たず、
前記光学シートは、前記支持辺が前記筐体の内壁に接触した状態で保持され、前記光学シートの当該支持辺と前記筐体の内壁との少なくともいずれかは、接触する箇所において、他の箇所よりも表面粗さを細かくする処理が施されていることを特徴とする表示装置である。
また、本発明は、表示パネルと、
前記表示パネルを背面側から照明する光源ユニットと、
前記表示パネルと前記光源ユニットの間に配置される光学シートと、
前記表示パネルと前記光源ユニットと前記光学シートとを収容する筐体と、
を備え、
前記光学シートは、前記光学シートの４辺のうち少なくとも１つの支持辺に沿った領域に、１又は複数の孔部を備え、
前記４辺のうち前記支持辺と平行な他の辺と前記筐体との間に間隙が設けられ、
前記筐体には、前記孔部に係合し、前記支持辺に対して垂直の方向の前記光学シートの移動を制限する位置決め手段が設けられ、
前記光学シートは、前記４辺のうち前記他の辺に沿った領域に、前記位置決め手段と係合するための前記孔部を持たず、
前記光学シートの支持辺は、前記光学シートと前記筐体の内壁との間に設けられる摺動部材又は回動部材により保持される表示装置である。
The present invention includes a display panel,
A light source unit that illuminates the display panel from the back side;
An optical sheet disposed between the display panel and the light source unit;
A housing for housing the display panel, the light source unit, and the optical sheet;
With
The optical sheet includes one or a plurality of holes in a region along at least one support side of the four sides of the optical sheet,
A gap is provided between the casing and the other side of the four sides parallel to the support side,
The casing is provided with positioning means for engaging the hole and limiting movement of the optical sheet in a direction perpendicular to the support side,
The optical sheet does not have the hole for engaging with the positioning means in a region along the other side of the four sides ,
The optical sheet is held in a state where the holding means provided on the support side is in contact with the inner wall of the housing,
In the display device, the frictional resistance between the holding unit and the inner wall of the casing is smaller than the frictional resistance between the support side of the optical sheet and the inner wall of the casing .
The present invention also provides a display panel,
A light source unit that illuminates the display panel from the back side;
An optical sheet disposed between the display panel and the light source unit;
A housing for housing the display panel, the light source unit, and the optical sheet;
With
The optical sheet includes one or a plurality of holes in a region along at least one support side of the four sides of the optical sheet,
A gap is provided between the casing and the other side of the four sides parallel to the support side,
The casing is provided with positioning means for engaging the hole and limiting movement of the optical sheet in a direction perpendicular to the support side,
The optical sheet does not have the hole for engaging with the positioning means in a region along the other side of the four sides,
The optical sheet is held in a state in which the support side is in contact with the inner wall of the housing, and at least one of the support side of the optical sheet and the inner wall of the housing is in the other part The display device is characterized in that a process for making the surface roughness finer is performed.
The present invention also provides a display panel,
A light source unit that illuminates the display panel from the back side;
An optical sheet disposed between the display panel and the light source unit;
A housing for housing the display panel, the light source unit, and the optical sheet;
With
The optical sheet includes one or a plurality of holes in a region along at least one support side of the four sides of the optical sheet,
A gap is provided between the casing and the other side of the four sides parallel to the support side,
The casing is provided with positioning means for engaging the hole and limiting movement of the optical sheet in a direction perpendicular to the support side,
The optical sheet does not have the hole for engaging with the positioning means in a region along the other side of the four sides,
The support side of the optical sheet is a display device held by a sliding member or a rotating member provided between the optical sheet and the inner wall of the housing.

本発明は、表示パネルと、
前記表示パネルを背面側から照明する光源ユニットと、
前記表示パネルと前記光源ユニットの間に配置される光学シートと、
前記表示パネルと前記光源ユニットと前記光学シートとを収容する筐体と、
を備え、
前記光学シートは、前記光学シートの４辺のうち第１支持辺および前記第１支持辺に垂直な第２支持辺の交点の近傍に孔部を有し、
前記光学シートの前記４辺のうち、前記第１支持辺および前記第２支持辺でない他の辺と前記筐体との間に、間隙が設けられ、
前記筐体は、前記孔部に係合し、前記筐体の内壁に垂直の方向の前記光学シートの移動を制限する位置決め手段を有し、
前記光学シートは、前記光学シートにおいて前記第１支持辺および前記第２支持辺の交点の対角の近傍に、前記位置決め手段と係合するための前記孔部を有さず、
前記光学シートは、支持辺が前記筐体の内壁に接触した状態で保持され、前記光学シートの当該支持辺と前記筐体の内壁との少なくともいずれかは、接触する箇所において、他の箇所よりも表面粗さを細かくする処理が施されていることを特徴とする表示装置である。
また、本発明は、表示パネルと、
前記表示パネルを背面側から照明する光源ユニットと、
前記表示パネルと前記光源ユニットの間に配置される光学シートと、
前記表示パネルと前記光源ユニットと前記光学シートとを収容する筐体と、
を備え、
前記光学シートは、前記光学シートの４辺のうち第１支持辺および前記第１支持辺に垂直な第２支持辺の交点の近傍に孔部を有し、
前記光学シートの前記４辺のうち、前記第１支持辺および前記第２支持辺でない他の辺と前記筐体との間に、間隙が設けられ、
前記筐体は、前記孔部に係合し、前記筐体の内壁に垂直の方向の前記光学シートの移動を制限する位置決め手段を有し、
前記光学シートは、前記光学シートにおいて前記第１支持辺および前記第２支持辺の交点の対角の近傍に、前記位置決め手段と係合するための前記孔部を有さず、
前記光学シートの支持辺は、前記光学シートと前記筐体の内壁との間に設けられる摺動部材又は回動部材により保持される表示装置である。 The present invention includes a display panel,
A light source unit that illuminates the display panel from the back side;
An optical sheet disposed between the display panel and the light source unit;
A housing for housing the display panel, the light source unit, and the optical sheet;
With
The optical sheet has a hole in the vicinity of the intersection of the first support side and the second support side perpendicular to the first support side among the four sides of the optical sheet,
Among the four sides of the optical sheet, a gap is provided between the first support side and another side that is not the second support side and the housing,
The housing includes positioning means that engages with the hole and restricts movement of the optical sheet in a direction perpendicular to an inner wall of the housing;
The optical sheet is in the vicinity of the diagonal of the intersection of the first support side and the second supporting sides in the optical sheet, without being perforated with the hole for engagement with said positioning means,
The optical sheet is held in a state in which a support side is in contact with the inner wall of the casing, and at least one of the support side of the optical sheet and the inner wall of the casing is more than the other part at the contact point. The display device is characterized in that the surface roughness is processed .
The present invention also provides a display panel,
A light source unit that illuminates the display panel from the back side;
An optical sheet disposed between the display panel and the light source unit;
A housing for housing the display panel, the light source unit, and the optical sheet;
With
The optical sheet has a hole in the vicinity of the intersection of the first support side and the second support side perpendicular to the first support side among the four sides of the optical sheet,
Among the four sides of the optical sheet, a gap is provided between the first support side and another side that is not the second support side and the housing,
The housing includes positioning means that engages with the hole and restricts movement of the optical sheet in a direction perpendicular to an inner wall of the housing;
The optical sheet does not have the hole for engaging with the positioning means in the vicinity of the diagonal of the intersection of the first support side and the second support side in the optical sheet,
The support side of the optical sheet is a display device held by a sliding member or a rotating member provided between the optical sheet and the inner wall of the housing.

本発明によれば、光学シートを有する表示装置において、振動によって光学シート同士が擦れることを抑制し、光学シートに熱変形が生じた場合でも光学シートにガタやシワが発生することを抑制することができる。 According to the present invention, in a display device having an optical sheet, the optical sheets are prevented from rubbing with each other by vibration, and even when the optical sheet is thermally deformed, the optical sheet is prevented from being loose or wrinkled. Can do.

実施例１に係る表示モジュール構造を示す分解斜視図1 is an exploded perspective view showing a display module structure according to Embodiment 1. FIG. 実施例１に係る表示モジュール構造を示す断面図Sectional drawing which shows the display module structure which concerns on Example 1. FIG. 実施例１に係る光学シートの保持構造を示す模式図Schematic diagram showing the holding structure of the optical sheet according to Example 1 実施例１に係る光学シートの保持構造を示す模式図Schematic diagram showing the holding structure of the optical sheet according to Example 1 実施例１に係る光学シートの保持構造を示す模式図Schematic diagram showing the holding structure of the optical sheet according to Example 1 実施例１に係る光学シートの保持構造を示す模式図Schematic diagram showing the holding structure of the optical sheet according to Example 1 実施例１に係る光学シートの保持構造を示す模式図Schematic diagram showing the holding structure of the optical sheet according to Example 1 実施例２に係る光学シートの保持構造を示す模式図Schematic diagram showing the holding structure of the optical sheet according to Example 2 実施例３に係る光学シートの保持構造を示す模式図Schematic diagram showing the holding structure of the optical sheet according to Example 3 従来技術に係る光学シートの保持構造を示す模式図Schematic diagram showing optical sheet holding structure according to the prior art

（実施例１）
以下、図に基づいて本発明の実施例１を説明する。
図１、図２を用いて本発明の表示モジュールの構造について説明する。図１は、実施例１に係る表示モジュールの概略を表す分解斜視図を示し、図２は実施例１に係る表示モジュールの断面図を示す。 Example 1
Embodiment 1 of the present invention will be described below with reference to the drawings.
The structure of the display module of the present invention will be described with reference to FIGS. FIG. 1 is an exploded perspective view illustrating an outline of the display module according to the first embodiment, and FIG. 2 is a cross-sectional view of the display module according to the first embodiment.

表示モジュール１は、表示パネルであるＬＣＤパネル１０と、ＬＣＤパネル１０を背面側から照明する光源ユニットとしてＬＥＤをマトリックス状に実装したＬＥＤ基板１１と、を有する。また、ＬＣＤパネル１０とＬＥＤ基板１１の間には、ＬＥＤの光を拡散、集光する機能を備える複数の光学シート１２を配置し、ＬＥＤ基板１１の上には、光をＬＣ
Ｄパネル１０側へ反射する反射シート１３を配置した構造となっている。 The display module 1 includes an LCD panel 10 that is a display panel, and an LED substrate 11 on which LEDs are mounted in a matrix as a light source unit that illuminates the LCD panel 10 from the back side. In addition, a plurality of optical sheets 12 having a function of diffusing and condensing LED light are arranged between the LCD panel 10 and the LED substrate 11.
The reflection sheet 13 that reflects toward the D panel 10 side is arranged.

次に、これらの光学系部品を収容する筐体による保持構造について説明する。ＬＣＤパネル１０は、画像を表示する画像表示範囲１０ａの外側の周縁部を、正面側及び背面側からパネルケース１４とパネルホルダ１５により挟持されている。ＬＥＤ基板１１及び反射シート１３は、パネル側に開口を備える箱状のバックライトケース１６に収容されている。光学シート１２は、ＬＣＤパネル１０の画像表示範囲１０ａを照明する有効照明範囲１２ａの外側の非有効照明範囲１２ｂを、正面側及び背面側から、パネルホルダ１５とバックライトケース１６により狭持されている。 Next, a description will be given of a holding structure by a housing that accommodates these optical system components. The LCD panel 10 is sandwiched by the panel case 14 and the panel holder 15 from the front side and the back side at the outer peripheral portion of the image display range 10a for displaying an image. The LED substrate 11 and the reflection sheet 13 are accommodated in a box-shaped backlight case 16 having an opening on the panel side. The optical sheet 12 is sandwiched by the panel holder 15 and the backlight case 16 from the front side and the back side of the non-effective illumination range 12b outside the effective illumination range 12a that illuminates the image display range 10a of the LCD panel 10. Yes.

次に、光学シートの位置決め構造について説明する。光学シート１２の４辺のうち縦方向の１辺及び横方向の１辺それぞれを、パネルホルダ１５の内壁により保持される支持辺１２ｃとする。また、縦方向及び横方向の辺のうち支持辺１２ｃの反対側の辺のそれぞれを、パネルホルダ１５の内壁との間に間隙が設けられる非接触辺１２ｄとする。また、光学シート１２の２つの支持辺１２ｃ近傍の非有効照明範囲１２ｂ、すなわちＬＣＤパネル１０の画像表示範囲の外側の周縁部に対応する領域に、それぞれの支持辺１２ｃに対して平行な孔部１２ｅを設ける。孔部１２ｅは、光学シート１２の支持辺１２ｃに平行な内壁を有する直方体形状の貫通孔である。また、バックライトケース１６には、光学シート１２の設置面からＬＣＤパネル１０側に向かって曲げ起こした凸形状１６ａを設け、孔部１２ｅの支持辺１２ｃ側に接触させる。 Next, the positioning structure of the optical sheet will be described. Of the four sides of the optical sheet 12, one side in the vertical direction and one side in the horizontal direction are set as support sides 12 c held by the inner wall of the panel holder 15. Further, each of the sides in the vertical direction and the horizontal direction on the side opposite to the support side 12 c is defined as a non-contact side 12 d in which a gap is provided between the inner wall of the panel holder 15. In addition, in the area corresponding to the ineffective illumination range 12b in the vicinity of the two support sides 12c of the optical sheet 12, that is, the outer periphery of the image display range of the LCD panel 10, holes parallel to the respective support sides 12c are provided. 12e is provided. The hole 12 e is a rectangular parallelepiped through-hole having an inner wall parallel to the support side 12 c of the optical sheet 12. Further, the backlight case 16 is provided with a convex shape 16a bent and raised from the installation surface of the optical sheet 12 toward the LCD panel 10 side, and is brought into contact with the support side 12c side of the hole 12e.

次に、図３を用いて実施例１の各部の寸法関係と効果について説明する。図３は本発明に係る光学シートの保持構造を示す模式図である。
表示モジュール１の発熱や環境温度によって光学シート１２の温度は変化する。このとき、光学シート１２は、２つの非接触辺１２ｄが支持辺１２ｃに平行に変形するようにシート全体が伸縮するが、非接触辺１２ｄは、パネルホルダ１５に接触しない寸法関係となっている。すなわち、基準温度（例えばパネルモジュールの使用環境として想定される一般的な温度、常温）時における非接触辺１２ｄとパネルホルダ１５の間隙Ｘは、次の関係を満たすように定める。

Ｘ≧Ｌ×α×Δｔ１・・・（式１）

ここで、光学シートの長さをＬ、光学シートの熱膨張係数をα、基準温度からの所定の温度上昇幅（例えば最大温度上昇幅）をΔｔ１とする。 Next, the dimensional relationship and effect of each part of Example 1 will be described with reference to FIG. FIG. 3 is a schematic view showing the optical sheet holding structure according to the present invention.
The temperature of the optical sheet 12 changes depending on the heat generation of the display module 1 and the environmental temperature. At this time, the optical sheet 12 expands and contracts as a whole so that the two non-contact sides 12d are deformed in parallel to the support side 12c, but the non-contact side 12d has a dimensional relationship that does not contact the panel holder 15. . That is, the gap X between the non-contact side 12d and the panel holder 15 at a reference temperature (for example, a general temperature assumed as a use environment of the panel module, normal temperature) is determined so as to satisfy the following relationship.

X ≧ L × α × Δt1 (Formula 1)

Here, it is assumed that the length of the optical sheet is L, the thermal expansion coefficient of the optical sheet is α, and a predetermined temperature increase width (for example, maximum temperature increase width) from the reference temperature is Δt1.

また、同様に光学シート１２の孔部１２ｅの位置は、シート全体の伸縮に伴い支持辺１２ｃに平行にその位置が変化するが、孔部１２ｅの位置及び長さは、熱変形によって孔部１２ｅがバックライトケース１６の凸形状１６ａに接触しない寸法関係となっている。すなわち、基準温度における支持辺１２ｃから孔部１２ｅまでの距離Ｙと孔部１２ｅの長さＨは、次の関係を満たすように定める。

Ｙ≦ｙ−（Ｙ×α×Δｔ１）・・・（式２）
Ｈ＋Ｙ≧ｙ＋ｈ＋［（Ｈ＋Ｙ）×α×Δｔ２］・・・(式３)

ここで、基準温度における支持辺１２ｃから凸形状１６ａまでの距離をｙ、凸形状１６ａの長さをｈ、光学シートの熱膨張係数をαとする。また、基準温度からの所定の温度上昇幅（例えば最大温度上昇幅）をΔｔ１、基準温度からの所定の温度下降幅（例えば最大温度下降幅）をΔｔ２とする。 Similarly, the position of the hole 12e of the optical sheet 12 changes in parallel with the support side 12c as the entire sheet expands / contracts. However, the position and length of the hole 12e changes due to thermal deformation. However, it has a dimensional relationship that does not contact the convex shape 16 a of the backlight case 16. That is, the distance Y from the support side 12c to the hole 12e and the length H of the hole 12e at the reference temperature are determined so as to satisfy the following relationship.

Y ≦ y− (Y × α × Δt1) (Formula 2)
H + Y ≧ y + h + [(H + Y) × α × Δt2] (Formula 3)

Here, the distance from the support side 12c to the convex shape 16a at the reference temperature is y, the length of the convex shape 16a is h, and the thermal expansion coefficient of the optical sheet is α. Further, a predetermined temperature increase width (for example, maximum temperature increase width) from the reference temperature is Δt1, and a predetermined temperature decrease width (for example, maximum temperature decrease width) from the reference temperature is Δt2.

以上の構成により、光学シート１２は位置決めされているため、振動によってシート同
士が擦れることを抑制できる。また、光学シート１２の位置決め形状は、２つの支持辺１２ｃ近傍を、パネルホルダの内壁面に垂直の方向への移動を制限し、支持辺１２ｃに平行な方向への変形（光学シート１２の膨張又は収縮による変形）を許容する凸形状を有する。そのため、熱変形の際に非接触辺１２ｄが平行移動するようにシート全体が伸縮し、位置決め形状に大きな力が加わらないため、光学シート１２にガタやシワが発生することを抑制できる。 With the above configuration, since the optical sheet 12 is positioned, it is possible to suppress the sheets from being rubbed by vibration. Further, the positioning shape of the optical sheet 12 restricts the movement in the direction perpendicular to the inner wall surface of the panel holder in the vicinity of the two support sides 12c, and deforms in a direction parallel to the support side 12c (expansion of the optical sheet 12). (Or deformation due to shrinkage). For this reason, the entire sheet expands and contracts so that the non-contact side 12d moves in parallel during thermal deformation, and a large force is not applied to the positioning shape, so that the optical sheet 12 can be prevented from being loose or wrinkled.

実施例１では、凸形状をバックライトケースに設けたが、パネルホルダ等の別部品に設けてもよい。凸形状は、円柱形状でもよいし、孔部に接触する面が円弧である形状であってもよい。孔部及び凸形状は、各方向に１ヶ所以上あればよい。孔部は、凸形状と接触する面のみ接触面と平行であればよい。光学シートは、正面及び背面方向に対して間隙があってもよいし、弾性部材によって挟持されてもよい。 Although the convex shape is provided in the backlight case in the first embodiment, it may be provided in another component such as a panel holder. The convex shape may be a cylindrical shape or a shape in which the surface in contact with the hole is an arc. The hole and the convex shape may be at least one place in each direction. Only the surface of the hole that is in contact with the convex shape may be parallel to the contact surface. The optical sheet may have a gap with respect to the front and back directions, or may be sandwiched between elastic members.

実施例１では、光学シート１２の４辺のうちパネルホルダ１５の内壁に接触した状態で保持される支持辺１２ｃとする辺が、縦方向の辺は左辺、横方向の辺は下辺である場合を例示した。４辺のうち縦方向の１辺及び横方向の１辺それぞれを支持辺１２ｃとするのであればこの例に限らない。例えば、図４に示すように、縦方向の辺は左辺、横方向の辺は上辺を支持辺１２ｃとして、上部に位置決め部が位置するようにしても良い。この場合、図４に示すように、左辺及び上辺の非有効照明範囲１２ｂに孔部１２ｅを設け、バックライトケース１６の左辺及び上辺の孔部１２ｅに対応する部分に凸形状１６ａを設ける。この構造によっても上述した実施例１の効果が得られる。 In Example 1, when the side to be the support side 12c held in contact with the inner wall of the panel holder 15 among the four sides of the optical sheet 12, the vertical side is the left side and the horizontal side is the lower side Was illustrated. The four sides are not limited to this example as long as one side in the vertical direction and one side in the horizontal direction are the support sides 12c. For example, as shown in FIG. 4, the vertical side may be the left side, and the horizontal side may be the upper side as the support side 12c, and the positioning unit may be positioned at the top. In this case, as shown in FIG. 4, a hole 12e is provided in the ineffective illumination range 12b on the left side and the upper side, and a convex shape 16a is provided in a portion corresponding to the hole 12e on the left side and the upper side of the backlight case 16. Also with this structure, the effect of the first embodiment described above can be obtained.

実施例１では、基準温度時における孔部１２ｅと凸形状１６ａの中心位置が一致している場合を例示したが、これに限らない。上述した式１〜式３を満たせば、例えば図５のように孔部１２ｅと凸形状１６ａの中心位置が一致していなくても良い。式１〜式３を満たしていれば、光学シート１２が収縮した場合や膨張した場合においても、光学シート１２が凸形状１６ａに当たることが抑制されるので、収縮や膨張の変形が制限されず、ガタやシワの発生を抑制できる。 In the first embodiment, the case where the center positions of the hole 12e and the convex shape 16a coincide with each other at the reference temperature is illustrated, but the present invention is not limited thereto. If Expressions 1 to 3 described above are satisfied, for example, the center positions of the hole 12e and the convex shape 16a do not have to coincide with each other as shown in FIG. If Formulas 1 to 3 are satisfied, even when the optical sheet 12 contracts or expands, the optical sheet 12 is prevented from hitting the convex shape 16a, so the deformation of the contraction and expansion is not limited, Generation of backlash and wrinkles can be suppressed.

図６（Ａ）はパネルホルダ１５及びバックライトケース１６の凸形状１６ａのみを示した図であり、図６（Ｂ）は光学シート１２のみを示した図である。図６（Ａ）において、凸形状１６ａの下面１６ｇと、パネルホルダ１５の光学シート１２との接触面１５ｃとの面に垂直の方向の距離ｂとする。図６（Ｂ）において、バックライトケース１６に取り付けていない状態での光学シート１２の孔部１２ｅの下面１２ｇと、パネルホルダ１５に接触する支持辺１２ｃとの間の、パネルホルダ１５の内壁面に垂直の方向の距離ａとする。このとき、

ａ≦ｂ・・・（式４）

を満たすことが望ましい。これにより、光学シートの変形に際して制限がかかることが抑制され、シワの発生による画質低下が抑制される。 6A is a diagram showing only the convex shape 16a of the panel holder 15 and the backlight case 16, and FIG. 6B is a diagram showing only the optical sheet 12. FIG. In FIG. 6A, the distance b is a distance b in a direction perpendicular to the surface between the lower surface 16g of the convex shape 16a and the contact surface 15c of the panel holder 15 with the optical sheet 12. In FIG. 6B, the inner wall surface of the panel holder 15 between the lower surface 12 g of the hole 12 e of the optical sheet 12 and the support side 12 c that contacts the panel holder 15 when not attached to the backlight case 16. The distance a in the direction perpendicular to At this time,

a ≦ b (Formula 4)

It is desirable to satisfy. As a result, it is possible to prevent the optical sheet from being restricted, and to suppress deterioration in image quality due to wrinkles.

図７は、基準温度において図３のように設置された光学シート１２が熱膨張した場合の様子を模式的に示す図である。図７に示すように、光学シート１２は図の右側及び上側に向かって膨張することができる。凸形状１６ａと孔部１２ｅの大きさが上記のように設定されることにより、図７に示すように、膨張した場合でも光学シート１２の右側及び上側へ向かっての変形が規制されることがないため、シワの発生が抑制される。図７に示すように、膨張による変形により、孔部１２ｅと凸形状１６ａとの位置関係は、左辺においては孔部１２ｅが相対的に上に位置し、下辺においては孔部１２ｅが相対的に右に位置していることがわかる。 FIG. 7 is a diagram schematically showing a state where the optical sheet 12 installed as shown in FIG. 3 is thermally expanded at the reference temperature. As shown in FIG. 7, the optical sheet 12 can expand toward the right side and the upper side of the figure. By setting the sizes of the convex shape 16a and the hole 12e as described above, as shown in FIG. 7, even when the optical sheet 12 expands, deformation of the optical sheet 12 toward the right side and the upper side is restricted. Therefore, the generation of wrinkles is suppressed. As shown in FIG. 7, due to deformation due to expansion, the positional relationship between the hole 12e and the convex shape 16a is such that the hole 12e is positioned relatively upward on the left side and the hole 12e is relatively positioned on the lower side. You can see that it is located on the right.

（実施例２）
以下、図に基づいて本発明の実施例２を説明する。
図８は、実施例２に係る光学シートの保持構造を示す模式図である。
実施例２は概略の構成が実施例１と同じなため、異なる部分についてのみ説明する。光学シート１２の４辺のうち縦方向の１辺及び横方向の１辺それぞれをパネルホルダ１５の内壁に接触した状態で保持される支持辺１２ｃとする。また、縦方向及び横方向の辺のうち支持辺１２ｃの反対側の辺のそれぞれを、パネルホルダ１５の内壁との間に間隙が設けられる非接触辺１２ｄとする。すなわち４辺のうち２つは支持辺１２ｃであり、他の２つは非接触辺１２ｄとする。また、光学シート１２は、支持辺１２ｃである２つの辺の交点の角の非有効照明範囲１２ｂに、表示面に垂直な方向の円柱形状の孔部１２ｆを設ける。また、バックライトケース１６には、光学シート１２の設置面からＬＣＤパネル１０側に向かって孔部１２ｆと略同径の円柱形状１６ｂを設け、孔部１２ｆと係合させる。
以上の構成により、実施例１と異なる構造で同様の効果を得ることができる。 (Example 2)
The second embodiment of the present invention will be described below with reference to the drawings.
FIG. 8 is a schematic diagram illustrating the optical sheet holding structure according to the second embodiment.
Since the schematic configuration of the second embodiment is the same as that of the first embodiment, only different portions will be described. Of the four sides of the optical sheet 12, one side in the vertical direction and one side in the horizontal direction are defined as support sides 12 c held in contact with the inner wall of the panel holder 15. Further, each of the sides in the vertical direction and the horizontal direction on the side opposite to the support side 12 c is defined as a non-contact side 12 d in which a gap is provided between the inner wall of the panel holder 15. That is, two of the four sides are support sides 12c, and the other two are non-contact sides 12d. Further, the optical sheet 12 is provided with a cylindrical hole portion 12f in a direction perpendicular to the display surface in the non-effective illumination range 12b at the corner of the intersection of the two sides which are the support side 12c. Further, the backlight case 16 is provided with a columnar shape 16b having substantially the same diameter as the hole 12f from the installation surface of the optical sheet 12 toward the LCD panel 10, and is engaged with the hole 12f.
With the above configuration, the same effect can be obtained with a structure different from that of the first embodiment.

実施例１では、孔部１２ｅの形状が直方体形状、すなわち、紙面に平行の面による断面が長方形になる形状の場合を例示した。また、実施例２では、孔部１２ｆの形状が円柱形状、すなわち、紙面に平行の面による断面が円形になる形状の場合を例示した。しかし、孔部１２ｅや孔部１２ｆの形状はこれに限らない。例えば、紙面に平行の面による断面形状が正方形、台形、円形等、種々の形状でも良い。 In Example 1, the case where the shape of the hole 12e is a rectangular parallelepiped shape, that is, a shape in which a cross section by a plane parallel to the paper surface is a rectangle is illustrated. Further, in the second embodiment, the case where the shape of the hole 12f is a cylindrical shape, that is, a shape in which a cross section by a plane parallel to the paper surface is circular is illustrated. However, the shape of the hole 12e and the hole 12f is not limited to this. For example, the cross-sectional shape by a plane parallel to the paper surface may be various shapes such as a square, a trapezoid, and a circle.

（実施例３）
以下、図に基づいて本発明の実施例３を説明する。
図９は、実施例３に係る光学シートの保持構造を示す模式図である。
実施例３は概略の構成は実施例１と同じであるため、実施例１と異なる部分について主に説明する。光学シート１２は、４辺のうち縦方向の１辺及び横方向の１辺をそれぞれパネルホルダ１５の内壁に接触した状態で保持される２つの支持辺１２ｃとし、支持辺１２ｃの反対側の辺をそれぞれパネルホルダ１５の内壁に隙間を設ける２つの非接触辺１２ｄとする。また、光学シート１２は、２つの支持辺１２ｃ近傍の非有効照明範囲１２ｂに、それぞれの支持辺１２ｃに対して平行な孔部１２ｅを設ける。また、光学シート１２は、バックライトケース１６に光学シート１２の設置面からＬＣＤパネル１０側に向かって曲げ起こした凸形状１６ａを設け、孔部１２ｅの支持辺１２ｃ側に接触させる。また、光学シート１２の支持辺１２ｃに接触するパネルホルダ１５の内壁には、円弧状の凸形状１５ｂが形成されている。 (Example 3)
The third embodiment of the present invention will be described below with reference to the drawings.
FIG. 9 is a schematic diagram illustrating the optical sheet holding structure according to the third embodiment.
Since the schematic configuration of the third embodiment is the same as that of the first embodiment, portions different from the first embodiment will be mainly described. The optical sheet 12 includes two support sides 12c that are held in a state in which one side in the vertical direction and one side in the horizontal direction of the four sides are in contact with the inner wall of the panel holder 15, and the side opposite to the support side 12c. Are the two non-contact sides 12d that provide a gap in the inner wall of the panel holder 15, respectively. Further, the optical sheet 12 is provided with holes 12e parallel to the respective support sides 12c in the ineffective illumination range 12b in the vicinity of the two support sides 12c. In addition, the optical sheet 12 is provided with a convex shape 16a bent and raised from the installation surface of the optical sheet 12 toward the LCD panel 10 on the backlight case 16, and is brought into contact with the support side 12c side of the hole 12e. An arcuate convex shape 15 b is formed on the inner wall of the panel holder 15 that contacts the support side 12 c of the optical sheet 12.

以上の構成により、実施例１と同様の効果を得ることができる。また、光学シート１２の支持辺１２ｃとパネルホルダ１５の内壁の円弧状の凸形状１５ｂとが接触するため、光学シート１２とパネルホルダ１５の間の摩擦抵抗が低減する。すなわち、支持辺１２ｃと凸形状１５ｂとの間の摩擦抵抗は、支持辺１２ｃとパネルホルダ１５の内壁面との間の摩擦抵抗より小さい。これにより、光学シート１２とパネルホルダ１５との摩擦熱による光学シート１２の熱変形が抑制されるので、光学シート１２にシワが発生することを抑制できる。 With the above configuration, the same effects as those of the first embodiment can be obtained. Further, since the support side 12c of the optical sheet 12 and the arcuate convex shape 15b of the inner wall of the panel holder 15 are in contact with each other, the frictional resistance between the optical sheet 12 and the panel holder 15 is reduced. That is, the frictional resistance between the support side 12 c and the convex shape 15 b is smaller than the frictional resistance between the support side 12 c and the inner wall surface of the panel holder 15. Thereby, since the thermal deformation of the optical sheet 12 due to the frictional heat between the optical sheet 12 and the panel holder 15 is suppressed, it is possible to suppress the generation of wrinkles in the optical sheet 12.

実施例３において、摩擦低減を実現するための部材として凸形状１５ｂをパネルホルダ１５の内壁部に設ける例を説明したが、凸形状はパネルホルダ１５とは別部品としても良いし、光学シート１２に設けても良い。また、パネルホルダ１５の内壁に設ける部材は、光学シート１２とパネルホルダ１５との摩擦抵抗を低減する部材であれば図９の凸形状１５ｂ以外の形態でも良い。例えば、パネルホルダ１５と光学シート１２との接触する箇所の少なくとも一部に対し、磨いたり研磨したりすることで、他の箇所よりも表面粗さを細かくする処理を施すことにより、当該部分を摩擦低減手段としても良い。また、表面粗さ
が細かな部材であって、摩擦を低減可能なた部材を凸形状１５ｂの代わりにパネルホルダ１５に設けても良い。また、凸形状１５ｂの代わりに、パネルホルダ１５と光学シート１２の接触面とが摺動することを可能にする摺動部材を設けても良いし、ローラー等の回動部材を設けても良い。 In Example 3, although the example which provides the convex shape 15b in the inner wall part of the panel holder 15 as a member for implement | achieving friction reduction was demonstrated, a convex shape is good also as components different from the panel holder 15, and the optical sheet 12 is provided. May be provided. Further, the member provided on the inner wall of the panel holder 15 may be in a form other than the convex shape 15b of FIG. 9 as long as it is a member that reduces the frictional resistance between the optical sheet 12 and the panel holder 15. For example, by polishing or polishing at least a part of the part where the panel holder 15 and the optical sheet 12 are in contact with each other, the surface roughness is made finer than other parts. It is good also as a friction reduction means. Further, a member having a small surface roughness and capable of reducing friction may be provided in the panel holder 15 instead of the convex shape 15b. Instead of the convex shape 15b, a sliding member that enables the panel holder 15 and the contact surface of the optical sheet 12 to slide may be provided, or a rotating member such as a roller may be provided. .

１：表示モジュール、１０：ＬＣＤパネル、１１：ＬＥＤ基板、１２：光学シート、１２ｃ：接触面、１２ｄ：非接触面、１２ｅ：孔部、１５：パネルホルダ、１５ａ：内壁、１６：バックライトケース、１６ａ：凸形状 1: Display module, 10: LCD panel, 11: LED substrate, 12: Optical sheet, 12c: Contact surface, 12d: Non-contact surface, 12e: Hole, 15: Panel holder, 15a: Inner wall, 16: Backlight case , 16a: convex shape

Claims

A display panel;
A light source unit that illuminates the display panel from the back side;
An optical sheet disposed between the display panel and the light source unit;
A housing for housing the display panel, the light source unit, and the optical sheet;
With
The optical sheet includes one or a plurality of holes in a region along at least one support side of the four sides of the optical sheet,
A gap is provided between the casing and the other side of the four sides parallel to the support side,
Wherein the housing engages the hole, positioning means for limiting the movement of the optical sheet in a direction perpendicular provided for the support side,
The optical sheet does not have the hole for engaging with the positioning means in a region along the other side of the four sides ,
The optical sheet is held in a state where the holding means provided on the support side is in contact with the inner wall of the housing,
The display device according to claim 1, wherein a frictional resistance between the holding unit and the inner wall of the casing is smaller than a frictional resistance between the support side of the optical sheet and the inner wall of the casing .

The display device according to claim 1 , wherein the holding unit has an arcuate convex shape.

A display panel;
A light source unit that illuminates the display panel from the back side;
An optical sheet disposed between the display panel and the light source unit;
A housing for housing the display panel, the light source unit, and the optical sheet;
With
The optical sheet includes one or a plurality of holes in a region along at least one support side of the four sides of the optical sheet,
A gap is provided between the casing and the other side of the four sides parallel to the support side,
The casing is provided with positioning means for engaging the hole and limiting movement of the optical sheet in a direction perpendicular to the support side,
The optical sheet does not have the hole for engaging with the positioning means in a region along the other side of the four sides,
The optical sheet is held in a state in which the support side is in contact with the inner wall of the housing, and at least one of the support side of the optical sheet and the inner wall of the housing is in the other part The display device is characterized by being subjected to a process for making the surface roughness finer.

The display device according to claim 1, wherein the hole has a rectangular parallelepiped shape having an inner wall parallel to the inner wall of the housing.

The positioning means is a convex member provided in the casing, and the convex member is an inner wall on the side close to the inner wall of the casing among the inner walls parallel to the inner wall of the casing of the hole. The display device according to claim 4 , which is in contact with the display device.

The size of the gap between the inner wall perpendicular to the inner wall of the housing of the hole and the convex member is such that the inner wall of the hole has the convex shape when a predetermined temperature rise or temperature drop from a reference temperature. The display device according to claim 5 , wherein the display device is determined so as not to contact the member.

Members of the convex shape, members of cylindrical or display device as claimed in claim 5 or claim 6 contacting surface parallel inner wall to the inner wall of the housing of the hole is a member which is a circular arc .

A display panel;
A light source unit that illuminates the display panel from the back side;
An optical sheet disposed between the display panel and the light source unit;
A housing for housing the display panel, the light source unit, and the optical sheet;
With
The optical sheet has a hole in the vicinity of the intersection of the first support side and the second support side perpendicular to the first support side among the four sides of the optical sheet,
Among the four sides of the optical sheet, a gap is provided between the first support side and another side that is not the second support side and the housing,
The housing includes positioning means that engages with the hole and restricts movement of the optical sheet in a direction perpendicular to an inner wall of the housing;
The optical sheet is in the vicinity of the diagonal of the intersection of the first support side and the second supporting sides in the optical sheet, without being perforated with the hole for engagement with said positioning means,
The optical sheet is held in a state in which a support side is in contact with the inner wall of the casing, and at least one of the support side of the optical sheet and the inner wall of the casing is more than the other part at the contact point. The display device is characterized in that the surface roughness is processed .

The display device according to claim 8 , wherein the optical sheet is held in a state where the first support side and the second support side are in contact with an inner wall of the housing.

The positioning means is a convex member provided in the housing,
The hole A display device according to claim 8 or claim 9 which is a direction perpendicular cylindrical on the display surface of the display panel.

The hole has a display device according to any one of claims 1 to 10 provided on the periphery of the outside of the image display range of the display panel of the optical sheet.

Of the four sides of the optical sheet, the dimension of the gap between the side that is not the support side and the inner wall of the housing is such that the side that is not the support side when the temperature rises or falls from a reference temperature by a predetermined temperature. display device according to any one of claims 1 to 11 is determined so as not to contact with the inner wall of the body.

The positioning means allows deformation of the optical sheet in a direction parallel to a support side;
The deformation of the optical sheet, the display device according to any one of claims 1 to 12, which is a deformation due to expansion or contraction.

A display panel;
A light source unit that illuminates the display panel from the back side;
An optical sheet disposed between the display panel and the light source unit;
A housing for housing the display panel, the light source unit, and the optical sheet;
With
The optical sheet includes one or a plurality of holes in a region along at least one support side of the four sides of the optical sheet,
A gap is provided between the casing and the other side of the four sides parallel to the support side,
The casing is provided with positioning means for engaging the hole and limiting movement of the optical sheet in a direction perpendicular to the support side,
The optical sheet does not have the hole for engaging with the positioning means in a region along the other side of the four sides,
A display device in which a support side of the optical sheet is held by a sliding member or a rotating member provided between the optical sheet and an inner wall of the housing.

A display panel;
A light source unit that illuminates the display panel from the back side;
An optical sheet disposed between the display panel and the light source unit;
A housing for housing the display panel, the light source unit, and the optical sheet;
With
The optical sheet has a hole in the vicinity of the intersection of the first support side and the second support side perpendicular to the first support side among the four sides of the optical sheet,
Among the four sides of the optical sheet, a gap is provided between the first support side and another side that is not the second support side and the housing,
The housing includes positioning means that engages with the hole and restricts movement of the optical sheet in a direction perpendicular to an inner wall of the housing;
The optical sheet does not have the hole for engaging with the positioning means in the vicinity of the diagonal of the intersection of the first support side and the second support side in the optical sheet,
A display device in which a support side of the optical sheet is held by a sliding member or a rotating member provided between the optical sheet and an inner wall of the housing.