WO2011036706A1 - Stereoscopic display device - Google Patents
Stereoscopic display device Download PDFInfo
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- WO2011036706A1 WO2011036706A1 PCT/JP2009/004821 JP2009004821W WO2011036706A1 WO 2011036706 A1 WO2011036706 A1 WO 2011036706A1 JP 2009004821 W JP2009004821 W JP 2009004821W WO 2011036706 A1 WO2011036706 A1 WO 2011036706A1
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- liquid crystal
- crystal display
- lenticular sheet
- polarizing plate
- azimuth angle
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B30/00—Optical systems or apparatus for producing three-dimensional [3D] effects, e.g. stereoscopic images
- G02B30/20—Optical systems or apparatus for producing three-dimensional [3D] effects, e.g. stereoscopic images by providing first and second parallax images to an observer's left and right eyes
- G02B30/26—Optical systems or apparatus for producing three-dimensional [3D] effects, e.g. stereoscopic images by providing first and second parallax images to an observer's left and right eyes of the autostereoscopic type
- G02B30/27—Optical systems or apparatus for producing three-dimensional [3D] effects, e.g. stereoscopic images by providing first and second parallax images to an observer's left and right eyes of the autostereoscopic type involving lenticular arrays
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B30/00—Optical systems or apparatus for producing three-dimensional [3D] effects, e.g. stereoscopic images
- G02B30/20—Optical systems or apparatus for producing three-dimensional [3D] effects, e.g. stereoscopic images by providing first and second parallax images to an observer's left and right eyes
- G02B30/26—Optical systems or apparatus for producing three-dimensional [3D] effects, e.g. stereoscopic images by providing first and second parallax images to an observer's left and right eyes of the autostereoscopic type
- G02B30/30—Optical systems or apparatus for producing three-dimensional [3D] effects, e.g. stereoscopic images by providing first and second parallax images to an observer's left and right eyes of the autostereoscopic type involving parallax barriers
- G02B30/32—Optical systems or apparatus for producing three-dimensional [3D] effects, e.g. stereoscopic images by providing first and second parallax images to an observer's left and right eyes of the autostereoscopic type involving parallax barriers characterised by the geometry of the parallax barriers, e.g. staggered barriers, slanted parallax arrays or parallax arrays of varying shape or size
Definitions
- the present invention relates to a stereoscopic display device that displays a stereoscopic image.
- a stereoscopic image reproducing apparatus that reproduces a stereoscopic image by emitting light of a parallax image group displayed on a display unit through an array plate.
- the array plate is composed of a lenticular sheet or the like.
- the subpixels having different colors are arranged adjacent to each other (Patent Document 1).
- the observer's viewpoint position is detected.
- Left-eye and right-eye parallax images corresponding to the viewpoint position are selected from a plurality of parallax images. Even when the viewpoint position of the observer is changed, stereoscopic viewing can be satisfactorily performed (Patent Document 2).
- a light shielding part is provided along the boundary of the lens of the lenticular plate.
- the effective lens width between the light shielding portions is made smaller than the lens pitch (Patent Document 3).
- JP 2004-40722 A JP-A-8-314034 JP-A-6-308533
- a stereoscopic display device using a liquid crystal display and a lenticular sheet has a problem that the contrast before covering the lenticular sheet is lowered.
- the present invention has been made to solve the above-described problems, and an object of the present invention is to provide a stereoscopic display device that reduces a reduction in contrast.
- a stereoscopic display device of the present invention includes a liquid crystal display having a polarizing plate, a liquid crystal layer, and an illumination light source, and is installed on the display surface side of the liquid crystal display. It is substantially the same as the absorption axis direction of the plate.
- a reduction in contrast can be reduced in a stereoscopic display device using a liquid crystal display and a lenticular sheet.
- FIG. 1 is a schematic configuration of a stereoscopic display device according to an embodiment of the present invention.
- All-direction contrast characteristics of TN liquid crystal Contrast averaged over a certain range of azimuth angle and tilt angle of TN liquid crystal (range affecting lenticular sheet).
- FIG. 1 is a diagram showing a schematic configuration of the stereoscopic display device 100.
- the stereoscopic display device 100 includes a liquid crystal display 10, a backlight 20, and a lenticular sheet 30.
- the liquid crystal display 10 has a color liquid crystal display screen in which sub-pixels of RGB three primary colors are arranged in a matrix plane, for example.
- the liquid crystal display 10 is electrically driven by a driving device (not shown), and parallax information is displayed on each column of the display screen.
- the liquid crystal display 10 has two polarizing plates 10b and 10c so that the liquid crystal panel 10a is sandwiched.
- the polarizing plate 10b is affixed on the front side (observer A side) surface of the liquid crystal panel 10a.
- the polarizing plate 10c is affixed to the surface of the liquid crystal panel 10a on the back side (the side opposite to the viewer A).
- the polarizing plate axial directions of the polarizing plate 10b and the polarizing plate 10c are different by 90 degrees.
- the generatrix direction of the lenticular sheet 30 is substantially the same as the absorption axis direction (polarizing plate axis direction) of the polarizing plate 10b or 10c.
- a backlight 20 is disposed on the back side of the liquid crystal display 10. The backlight 20 illuminates the display screen of the liquid crystal display 10 by the backlight illumination light emitted by driving power supplied from a backlight power source (not shown).
- the lenticular sheet 30 is disposed on the opposite side of the backlight 20, that is, at a position between the display screen of the liquid crystal display 10 and the viewer A.
- a cylindrical lens array (hereinafter simply referred to as a lens) is disposed on the surface of the lenticular sheet 30.
- the light of the display image output from the liquid crystal display 10 is reproduced by a group of rays emitted from each lens, and is recognized by the observer A.
- FIG. 2 is a diagram showing a positional relationship between the polarizing plates 10b and 10c of the liquid crystal display 10 and the lenticular sheet 30.
- an arrow A indicates the bus line direction of the lenticular sheet 30.
- An arrow B indicates the absorption axis direction of the polarizing plate 10b.
- An arrow C indicates the absorption axis direction of the polarizing plate 10c. That is, in the three-dimensional display device 100 according to the embodiment, the lenticular sheet 30 is attached so that the generatrix direction of the lenticular sheet 30 and the absorption axis direction of the polarizing plate 10b are substantially the same direction. In addition, you may attach so that the bus-line direction of the lenticular sheet 30 and the absorption-axis direction of the polarizing plate 10c may be substantially the same direction.
- FIG. 3 and 4 are views of the positional relationship between the liquid crystal display 10 and the lenticular sheet 30 as viewed from above.
- Each lens 30a, 30b, 30c,... Of the lenticular sheet 30 has a size to which a plurality of sub-pixels of the liquid crystal display 10 are allocated so as to face one lens.
- the liquid crystal display 10 disposed on the back side of the lenticular sheet 30 as viewed from the viewer A displays a parallax image group, that is, a multi-viewpoint image that looks slightly different depending on the angle.
- the light emitted from the multi-viewpoint image is reproduced as a three-dimensional stereoscopic image by a group of light beams emitted from any one of the lenses 30a, 30b, 30c,.
- each subpixel can display an image with different directivities, different images can be displayed on the left and right eyes of the viewer A, and stereoscopic display can be recognized.
- the contrast reduction of the liquid crystal display 10 will be described.
- the front contrast is lowered.
- FIG. 4 shows light that contributes to the front contrast of the stereoscopic display device 100.
- the light emitted from the liquid crystal display 10 is collected by the lenticular sheet 30. For this reason, the light emitted to the front becomes light in an angle range determined by the focal length of the lenticular sheet 30 (angle 2 ⁇ in FIG. 4).
- the liquid crystal display 10 has a property that the contrast varies depending on the tilt angle. Contrast is lowered because it is collected in the front, including components having an inclination angle with poor contrast.
- FIG. 5 shows white display luminance (solid line) and black display luminance (broken line) with respect to a tilt angle of 0 degree azimuth angle of a TN (Twisted Nematic) type liquid crystal display.
- TN Transmission Nematic
- FIG. 6 shows contrast characteristics in all directions of the TN type liquid crystal display.
- absorption axes polarizing plate axis directions
- the polarizing plates 10b and 10c on the back surface and the front surface at azimuth angles of 45 degrees and 135 degrees with respect to the liquid crystal display.
- Azimuth angles of 45 degrees and 135 degrees provide the best contrast characteristics with respect to the tilt angle.
- the direction in which the optical action of the lenticular sheet 30 is exerted is the generatrix direction of the lenses 30a, 30b, 30c,. Therefore, in the present embodiment, the lens bus line direction of the lenticular sheet 30 is aligned with the absorption axis (polarizing plate axis direction) of the polarizing plates 10b and 10c.
- the light condensed by the lens of the lenticular sheet 30 gathers light having a relatively good contrast and improves the contrast reduction.
- the stereoscopic display device 100 has a parallax in the horizontal direction and an azimuth angle of 0 degree is used as the bus of the lenticular sheet 30, the rubbing direction of the liquid crystal cell is changed, and the absorption axes of the polarizing plates 10b and 10c are as shown in FIG. 0 degrees and 90 degrees.
- the azimuth angle setting range according to the present embodiment will be described.
- FIG. 7 shows a contrast obtained by averaging a certain range of the azimuth angle and the tilt angle of the liquid crystal display 10 (a range that affects the lenticular sheet 30). Contrast of 45 degrees in the axial direction of the polarizing plate 10b and ⁇ 45 degrees in the axial direction of the polarizing plate 10c is highest with respect to the azimuth angle of the liquid crystal display 10 is 0 degree. On the other hand, the average contrast near the azimuth angle of 0 degree or 90 degrees is reduced to about 80%.
- the contrast of the stereoscopic display device 100 is improved as compared to 0 degrees.
- the lens bus line direction of the lenticular sheet 30 is matched with the absorption axis (polarizing plate axis direction) of the polarizing plates 10b and 10c (substantially the same), the contrast is improved.
- the range in which an improvement effect of 70% can be obtained at least with respect to the difference between the maximum value and the minimum value of the contrast is a range of approximately ⁇ 10 degrees with an azimuth angle of 45 degrees (or -45 degrees).
- the contrast with the average of all the tilt angles of the liquid crystal display is set to the azimuth angle range within 30% of the difference from the minimum contrast value with reference to the maximum azimuth angle. Therefore, a range of approximately ⁇ 10 degrees with an azimuth angle of 45 degrees (or -45 degrees) is evaluated as a good contrast value.
- FIG. 8 shows the luminance of black display obtained by integrating a certain range of azimuth angle and tilt angle of the liquid crystal display 10 (range that affects the lenticular sheet 30).
- the black luminance of 45 degrees in the axial direction of the polarizing plate 10b and ⁇ 45 degrees in the axial direction of the polarizing plate 10c is the lowest compared to the azimuth angle of 0 degrees.
- the integrated luminance of black display has an inversely proportional relationship with the contrast curve shown in FIG. 7 and 8, it can be seen that the fact that the black luminance in the affected range is condensed on the front surface by the lenses 30a, 30b,... Of the lenticular sheet 30 is a factor in reducing the contrast.
- At least the direction of the lens bus of the lenticular sheet 30 is directed to a range where an improvement effect of 70% is obtained with respect to the difference between the maximum value and the minimum value of the black luminance integrated amount.
- the difference between the black display luminance maximum value and the azimuth angle within 30% of the black display luminance obtained by averaging all the tilt angles of the liquid crystal display is set as a reference. Thereby, a reduction in contrast can be reduced.
- the azimuth angle is an angle defined by the angles of the absorption axes of the polarizing plates 10b and 10c being 45 degrees and ⁇ 45 degrees, and the x axis of the liquid crystal display 10 is 0 degrees.
- the azimuth angle as the liquid crystal characteristic is the reference, not the azimuth angle as the coordinate system of the liquid crystal display.
- SYMBOLS 10 Liquid crystal display 10a ... Liquid crystal panel 10b, 10c ... Polarizing plate 20 Backlight 30 ... Lenticular sheet 30a, 30b, 30c ... Lens arrow A ... Lens bus line direction arrow B of lenticular sheet ... Absorption axis direction arrow C of polarizing plate 10b ... Absorption axis direction of polarizing plate 10c
Abstract
In a stereoscopic display device using a liquid crystal display and a lenticular sheet, contrast is deteriorated compared with that prior to applying the lenticular sheet. In order to improve the contrast deterioration, the liquid crystal display is composed of a polarization plate, a liquid crystal layer and an illuminating light source, and the lenticular sheet is disposed on the liquid crystal display and the bus bar direction is substantially the same as the absorption axis direction of the polarization plate of the liquid crystal display.
Description
本発明は、立体画像を表示する立体表示装置に関する。
The present invention relates to a stereoscopic display device that displays a stereoscopic image.
レンチキュラシートのレンズ作用を用いて画素を拡大し、指向性を生み出す。人間の左右眼に異なる画像を表示させ、立体感を知覚させる。この原理を用いたレンチキュラシートを用いる三次元の立体画像を表示する装置がある。
Magnify pixels using the lens action of the lenticular sheet to create directivity. Different images are displayed on the left and right eyes of a human to perceive a three-dimensional effect. There is an apparatus for displaying a three-dimensional stereoscopic image using a lenticular sheet using this principle.
例えば、表示手段に表示された視差画像群の光がアレイ板を通じて射出されることにより立体画像が再生される立体画像再生装置がある。アレイ板はレンチキュラシートなどで構成される。それぞれ色が異なる少なくとも３つのサブピクセルからなる小領域に対応して、異なる色のサブピクセル同士が隣り合うように配置される（特許文献１）。
For example, there is a stereoscopic image reproducing apparatus that reproduces a stereoscopic image by emitting light of a parallax image group displayed on a display unit through an array plate. The array plate is composed of a lenticular sheet or the like. Corresponding to a small area composed of at least three subpixels having different colors, the subpixels having different colors are arranged adjacent to each other (Patent Document 1).
また、観察者の視点位置を検出する。複数の視差画像から視点位置に応じた左眼用及び右眼用の視差画像を選択する。観察者の視点位置が変わった場合でも良好に立体視できる（特許文献２）。
Also, the observer's viewpoint position is detected. Left-eye and right-eye parallax images corresponding to the viewpoint position are selected from a plurality of parallax images. Even when the viewpoint position of the observer is changed, stereoscopic viewing can be satisfactorily performed (Patent Document 2).
また、レンチキュラー板のレンズの境界部に沿って遮光部を設ける。遮光部間のレンズ有効幅をレンズのピッチより小さくする（特許文献３）。
Also, a light shielding part is provided along the boundary of the lens of the lenticular plate. The effective lens width between the light shielding portions is made smaller than the lens pitch (Patent Document 3).
しかしながら、液晶ディスプレイとレンチキュラシート用いた立体表示装置は、レンチキュラシートを覆う前のコントラストが低下する問題点があった。
However, a stereoscopic display device using a liquid crystal display and a lenticular sheet has a problem that the contrast before covering the lenticular sheet is lowered.
本発明は、上記問題点を解決するためになされたもので、コントラストの低下を軽減する立体表示装置を提供することを目的とする。
The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a stereoscopic display device that reduces a reduction in contrast.
上記目的を達成するために、本発明の立体表示装置は、偏光板と液晶層と照明光源とを有する液晶ディスプレイと、前記液晶ディスプレイの表示面側に設置され、母線方向が前記液晶ディスプレイの偏光板の吸収軸方向と略同一であることを特徴とする。
In order to achieve the above object, a stereoscopic display device of the present invention includes a liquid crystal display having a polarizing plate, a liquid crystal layer, and an illumination light source, and is installed on the display surface side of the liquid crystal display. It is substantially the same as the absorption axis direction of the plate.
本発明によれば、液晶ディスプレイとレンチキュラシート用いた立体表示装置において、コントラストの低下が低減できる。
According to the present invention, a reduction in contrast can be reduced in a stereoscopic display device using a liquid crystal display and a lenticular sheet.
以下に添付図面を参照して、本発明の実施形態について説明する。
Embodiments of the present invention will be described below with reference to the accompanying drawings.
図１は、立体表示装置１００の概略構成を示す図である。立体表示装置１００は、液晶ディスプレイ１０、バックライト２０、レンチキュラシート３０を有する。
FIG. 1 is a diagram showing a schematic configuration of the stereoscopic display device 100. The stereoscopic display device 100 includes a liquid crystal display 10, a backlight 20, and a lenticular sheet 30.
液晶ディスプレイ１０は、例えばＲＧＢ３原色のサブピクセルがマトリクス平面状に配置されたカラー液晶表示画面を有する。液晶ディスプレイ１０は、図示していない駆動装置により電気的に駆動され、表示画面の各列に視差情報が表示される。液晶ディスプレイ１０は、液晶パネル１０ａが挟まれる様に、２つの偏光板１０ｂ，１０ｃを有する。偏光板１０ｂは、液晶パネル１０ａの正面側（観察者Ａ側）の表面に貼り付けられている。偏光板１０ｃは、液晶パネル１０ａの背面側（観察者Ａと反対側）の表面に貼り付けられている。偏光板１０ｂと偏光板１０ｃの偏光板軸方向は、９０度異なっている。
The liquid crystal display 10 has a color liquid crystal display screen in which sub-pixels of RGB three primary colors are arranged in a matrix plane, for example. The liquid crystal display 10 is electrically driven by a driving device (not shown), and parallax information is displayed on each column of the display screen. The liquid crystal display 10 has two polarizing plates 10b and 10c so that the liquid crystal panel 10a is sandwiched. The polarizing plate 10b is affixed on the front side (observer A side) surface of the liquid crystal panel 10a. The polarizing plate 10c is affixed to the surface of the liquid crystal panel 10a on the back side (the side opposite to the viewer A). The polarizing plate axial directions of the polarizing plate 10b and the polarizing plate 10c are different by 90 degrees.
レンチキュラシート３０の母線方向は、偏光板１０ｂ又は１０ｃの吸収軸方向（偏光板軸方向）と略同一である。液晶ディスプレイ１０の背面側には、バックライト２０が配置されている。バックライト２０は、図示していないバックライト用電源から供給される駆動電力により、バックライト照明灯が発光して液晶ディスプレイ１０の表示画面を照らす。
The generatrix direction of the lenticular sheet 30 is substantially the same as the absorption axis direction (polarizing plate axis direction) of the polarizing plate 10b or 10c. A backlight 20 is disposed on the back side of the liquid crystal display 10. The backlight 20 illuminates the display screen of the liquid crystal display 10 by the backlight illumination light emitted by driving power supplied from a backlight power source (not shown).
レンチキュラシート３０は、バックライト２０とは反対側、つまり液晶ディスプレイ１０の表示画面と観察者Ａとの間の位置に配置されている。このレンチキュラシート３０の表面にはシリンドリカルレンズアレイ（以下、単にレンズと称する）が配置されている。液晶ディスプレイ１０から出力された表示画像の光が各レンズから射出される光線群により三次元の立体画像が再生され、観察者Ａにより認識される。
The lenticular sheet 30 is disposed on the opposite side of the backlight 20, that is, at a position between the display screen of the liquid crystal display 10 and the viewer A. A cylindrical lens array (hereinafter simply referred to as a lens) is disposed on the surface of the lenticular sheet 30. The light of the display image output from the liquid crystal display 10 is reproduced by a group of rays emitted from each lens, and is recognized by the observer A.
図２は、液晶ディスプレイ１０の偏光板１０ｂ、１０ｃとレンチキュラシート３０の取り付け位置関係を示す図である。図２において、矢印Ａは、レンチキュラシート３０の母線方向を示している。矢印Ｂは、偏光板１０ｂの吸収軸方向を示している。また、矢印Ｃは、偏光板１０ｃの吸収軸方向を示している。つまり、実施形態に係る立体表示装置１００では、レンチキュラシート３０の母線方向と偏光板１０ｂの吸収軸方向とが略同一方向であるように取り付けられている。なお、レンチキュラシート３０の母線方向と偏光板１０ｃの吸収軸方向とが略同一方向であるように取り付けても構わない。
FIG. 2 is a diagram showing a positional relationship between the polarizing plates 10b and 10c of the liquid crystal display 10 and the lenticular sheet 30. FIG. In FIG. 2, an arrow A indicates the bus line direction of the lenticular sheet 30. An arrow B indicates the absorption axis direction of the polarizing plate 10b. An arrow C indicates the absorption axis direction of the polarizing plate 10c. That is, in the three-dimensional display device 100 according to the embodiment, the lenticular sheet 30 is attached so that the generatrix direction of the lenticular sheet 30 and the absorption axis direction of the polarizing plate 10b are substantially the same direction. In addition, you may attach so that the bus-line direction of the lenticular sheet 30 and the absorption-axis direction of the polarizing plate 10c may be substantially the same direction.
図３および図４は、液晶ディスプレイ１０とレンチキュラシート３０との位置関係を上から見た図である。レンチキュラシート３０の各レンズ３０ａ，３０ｂ，３０ｃ，‥は、１つのレンズに対向して液晶ディスプレイ１０の複数のサブピクセルが割り当てられる大きさを有している。観察者Ａから見て、レンチキュラシート３０の後ろ側に配置される液晶ディスプレイ１０は、角度に応じて微妙に見え方の違う視差画像群、すなわち多視点画像を表示する。この多視点画像から発せられた光は、いずれかのレンズ３０ａ，３０ｂ，３０ｃ，‥から射出される光線群により三次元の立体画像が再生される。
3 and 4 are views of the positional relationship between the liquid crystal display 10 and the lenticular sheet 30 as viewed from above. Each lens 30a, 30b, 30c,... Of the lenticular sheet 30 has a size to which a plurality of sub-pixels of the liquid crystal display 10 are allocated so as to face one lens. The liquid crystal display 10 disposed on the back side of the lenticular sheet 30 as viewed from the viewer A displays a parallax image group, that is, a multi-viewpoint image that looks slightly different depending on the angle. The light emitted from the multi-viewpoint image is reproduced as a three-dimensional stereoscopic image by a group of light beams emitted from any one of the lenses 30a, 30b, 30c,.
図３（ａ）において、観察者Ａの左目の入射する光Ｌは、レンチキュラシート３０によって拡大されたサブピクセルになる。図３（ｂ）において、観察者の右目Ｒに入射する光も異なるサブピクセルとなる。このように、それぞれのサブピクセルが異なる指向性を持って画像が表示できることによって、観察者Ａの左右眼に異なる画像が表示でき、立体表示を認識することができる。
3A, the light L incident on the left eye of the viewer A becomes a sub-pixel enlarged by the lenticular sheet 30. FIG. In FIG. 3B, the light incident on the viewer's right eye R is also a different subpixel. Thus, since each subpixel can display an image with different directivities, different images can be displayed on the left and right eyes of the viewer A, and stereoscopic display can be recognized.
液晶ディスプレイ１０のコントラスト低下について説明する。レンチキュラシート３０を液晶ディスプレイ１０の前に配置した立体表示装置１００では、正面のコントラストが低下する。
The contrast reduction of the liquid crystal display 10 will be described. In the stereoscopic display device 100 in which the lenticular sheet 30 is disposed in front of the liquid crystal display 10, the front contrast is lowered.
図４は、立体表示装置１００の正面コントラストに寄与する光を示している。液晶ディスプレイ１０から発光された光は、レンチキュラシート３０によって集光される。このため、正面に射出する光は、レンチキュラシート３０の焦点距離で決まる角度範囲（図４中の角度２θ）の光となる。液晶ディスプレイ１０は、傾斜角によってコントラストが異なる性質である。コントラストの悪い傾斜角の成分も含め正面に集めてしまうため、コントラストが低下する。
FIG. 4 shows light that contributes to the front contrast of the stereoscopic display device 100. The light emitted from the liquid crystal display 10 is collected by the lenticular sheet 30. For this reason, the light emitted to the front becomes light in an angle range determined by the focal length of the lenticular sheet 30 (angle 2θ in FIG. 4). The liquid crystal display 10 has a property that the contrast varies depending on the tilt angle. Contrast is lowered because it is collected in the front, including components having an inclination angle with poor contrast.
図５は、ＴＮ（Twisted Nematic）型液晶ディスプレイの方位角０度の傾斜角に対する白表示の輝度（実線）と黒表示の輝度（破線）を示す。方位角０度を中心に、傾斜角によって黒輝度は上昇し、白輝度は低下する。傾斜角が大きくなればなる程、黒輝度と白輝度の差が減少して、コントラストが低下している。
FIG. 5 shows white display luminance (solid line) and black display luminance (broken line) with respect to a tilt angle of 0 degree azimuth angle of a TN (Twisted Nematic) type liquid crystal display. Around the azimuth angle of 0 degrees, the black luminance increases and the white luminance decreases with the inclination angle. As the inclination angle increases, the difference between the black luminance and the white luminance decreases, and the contrast decreases.
図６は、ＴＮ型液晶ディスプレイの全方位のコントラスト特性を示す。ＴＮ型液晶ディスプレイの場合、液晶ディスプレイに対し方位角４５度と１３５度に裏面と前面の偏光板１０ｂ，１０ｃの吸収軸（偏光板軸方向）がある。方位角４５度と１３５度が、傾斜角に対し最もコントラストの特性が良くなる。
FIG. 6 shows contrast characteristics in all directions of the TN type liquid crystal display. In the case of a TN type liquid crystal display, there are absorption axes (polarizing plate axis directions) of the polarizing plates 10b and 10c on the back surface and the front surface at azimuth angles of 45 degrees and 135 degrees with respect to the liquid crystal display. Azimuth angles of 45 degrees and 135 degrees provide the best contrast characteristics with respect to the tilt angle.
また、レンチキュラシート３０の光学作用を及ぼす方向は、レンズ３０ａ，３０ｂ，３０ｃ，‥の母線方向である。そこで、本実施形態では、レンチキュラシート３０のレンズ母線方向を、この偏光板１０ｂ，１０ｃの吸収軸（偏光板軸方向）に合わせる。レンチキュラシート３０のレンズで集光される光は、コントラストが比較的良い光が集まりコントラスト低下が改善される。立体表示装置１００は、水平方向に視差を持たせ、方位角０度をレンチキュラシート３０の母線とする場合、液晶セルのラビング方向を変え、偏光板１０ｂ、１０ｃの吸収軸を図２に示すように０度と９０度とすることができる。
Further, the direction in which the optical action of the lenticular sheet 30 is exerted is the generatrix direction of the lenses 30a, 30b, 30c,. Therefore, in the present embodiment, the lens bus line direction of the lenticular sheet 30 is aligned with the absorption axis (polarizing plate axis direction) of the polarizing plates 10b and 10c. The light condensed by the lens of the lenticular sheet 30 gathers light having a relatively good contrast and improves the contrast reduction. When the stereoscopic display device 100 has a parallax in the horizontal direction and an azimuth angle of 0 degree is used as the bus of the lenticular sheet 30, the rubbing direction of the liquid crystal cell is changed, and the absorption axes of the polarizing plates 10b and 10c are as shown in FIG. 0 degrees and 90 degrees.
本実施形態に係る、方位角の設定範囲について説明する。
The azimuth angle setting range according to the present embodiment will be described.
図７は、液晶ディスプレイ１０の方位角と傾斜角の一定範囲（レンチキュラシート３０に影響を及ぼす範囲）を平均したコントラストを示す。液晶ディスプレイ１０の方位角０度に対し、偏光板１０ｂの軸方向の４５度と、偏光板１０ｃの軸方向の－４５度付近のコントラストが一番高い。一方、方位角０度や９０度付近の平均コントラストは、８割程度に低下している。
FIG. 7 shows a contrast obtained by averaging a certain range of the azimuth angle and the tilt angle of the liquid crystal display 10 (a range that affects the lenticular sheet 30). Contrast of 45 degrees in the axial direction of the polarizing plate 10b and −45 degrees in the axial direction of the polarizing plate 10c is highest with respect to the azimuth angle of the liquid crystal display 10 is 0 degree. On the other hand, the average contrast near the azimuth angle of 0 degree or 90 degrees is reduced to about 80%.
レンチキュラシート３０のレンズ母線を方位角４５度（もしくは－４５度）にしたときに、立体表示装置１００のコントラストが０度のときに比べ改善される。レンチキュラシート３０のレンズ母線方向を、この偏光板１０ｂ，１０ｃの吸収軸（偏光板軸方向）に合わせる（略同一）と、コントラストが改善する。少なくともコントラストの最大値と最小値の差に対し、７割の改善効果を得られる範囲は、方位角４５度（もしくは－４５度）のおおよそ±１０度の範囲である。言い換えると、液晶ディスプレイの全傾斜角を平均したコントラストを最大値となる方位角を基準として、コントラスト最小値との差が３割以内の方位角の範囲とする。よって、方位角４５度（もしくは－４５度）のおおよそ±１０度の範囲が、コントラストが良い値と評価される。
When the lens bus of the lenticular sheet 30 is set at an azimuth angle of 45 degrees (or -45 degrees), the contrast of the stereoscopic display device 100 is improved as compared to 0 degrees. When the lens bus line direction of the lenticular sheet 30 is matched with the absorption axis (polarizing plate axis direction) of the polarizing plates 10b and 10c (substantially the same), the contrast is improved. The range in which an improvement effect of 70% can be obtained at least with respect to the difference between the maximum value and the minimum value of the contrast is a range of approximately ± 10 degrees with an azimuth angle of 45 degrees (or -45 degrees). In other words, the contrast with the average of all the tilt angles of the liquid crystal display is set to the azimuth angle range within 30% of the difference from the minimum contrast value with reference to the maximum azimuth angle. Therefore, a range of approximately ± 10 degrees with an azimuth angle of 45 degrees (or -45 degrees) is evaluated as a good contrast value.
次に、黒輝度による方位角の設定範囲について説明する。
Next, the setting range of the azimuth angle by black luminance will be described.
図８は、液晶ディスプレイ１０の方位角と傾斜角の一定範囲（レンチキュラシート３０に影響を及ぼす範囲）を積算した黒表示の輝度を示す。偏光板１０ｂの軸方向の４５度と、偏光板１０ｃの軸方向の－４５度の黒輝度が、方位角０度に比べ一番低い。積算した黒表示の輝度は、図７に示すコントラスト曲線と反比例の関係となっている。図７と図８から、レンチキュラシート３０のレンズ３０ａ，３０ｂ、‥によって、影響を及ぼす範囲の黒輝度を正面に集光したことが、コントラスト低下の要因となっていたことが分かる。
FIG. 8 shows the luminance of black display obtained by integrating a certain range of azimuth angle and tilt angle of the liquid crystal display 10 (range that affects the lenticular sheet 30). The black luminance of 45 degrees in the axial direction of the polarizing plate 10b and −45 degrees in the axial direction of the polarizing plate 10c is the lowest compared to the azimuth angle of 0 degrees. The integrated luminance of black display has an inversely proportional relationship with the contrast curve shown in FIG. 7 and 8, it can be seen that the fact that the black luminance in the affected range is condensed on the front surface by the lenses 30a, 30b,... Of the lenticular sheet 30 is a factor in reducing the contrast.
したがって、少なくとも、この黒輝度の積算量が最大値と最小値との差に対し、７割の改善効果が得られる範囲にレンチキュラシート３０のレンズ母線方向を向ける。言い換えると、液晶ディスプレイの全傾斜角を平均した黒表示輝度を最小値となる方位角を基準として、黒表示輝度最大値との差が３割以内の方位角の範囲とする。これにより、コントラストの低下が低減できる。
Therefore, at least the direction of the lens bus of the lenticular sheet 30 is directed to a range where an improvement effect of 70% is obtained with respect to the difference between the maximum value and the minimum value of the black luminance integrated amount. In other words, the difference between the black display luminance maximum value and the azimuth angle within 30% of the black display luminance obtained by averaging all the tilt angles of the liquid crystal display is set as a reference. Thereby, a reduction in contrast can be reduced.
ここで方位角は説明の便宜上、偏光板１０ｂ，１０ｃの吸収軸方向を４５度と－４５度となる角度で定義した角度であり、液晶ディスプレイ１０のｘ軸を０度としている。ただし、ラビング方向や偏光板の吸収軸方向と液晶ディスプレイの角度は、独立に変更できるため、液晶ディスプレイの座標系としての方位角でなく、液晶の特性としての方位角が基準となる。
Here, for convenience of explanation, the azimuth angle is an angle defined by the angles of the absorption axes of the polarizing plates 10b and 10c being 45 degrees and −45 degrees, and the x axis of the liquid crystal display 10 is 0 degrees. However, since the rubbing direction and the absorption axis direction of the polarizing plate and the angle of the liquid crystal display can be changed independently, the azimuth angle as the liquid crystal characteristic is the reference, not the azimuth angle as the coordinate system of the liquid crystal display.
本発明は上記各実施形態に限らず、その主旨を逸脱しない限り種々に変更することができる。
The present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the gist thereof.
１０‥液晶ディスプレイ
１０ａ‥液晶パネル
１０ｂ，１０ｃ‥偏光板
２０‥バックライト
３０‥レンチキュラシート
３０ａ，３０ｂ，３０ｃ‥レンズ
矢印Ａ‥レンチキュラシートのレンズ母線方向
矢印Ｂ‥偏光板１０ｂの吸収軸方向
矢印Ｃ‥偏光板１０ｃの吸収軸方向 DESCRIPTION OFSYMBOLS 10 ... Liquid crystal display 10a ... Liquid crystal panel 10b, 10c ... Polarizing plate 20 Backlight 30 ... Lenticular sheet 30a, 30b, 30c ... Lens arrow A ... Lens bus line direction arrow B of lenticular sheet ... Absorption axis direction arrow C of polarizing plate 10b ... Absorption axis direction of polarizing plate 10c
１０ａ‥液晶パネル
１０ｂ，１０ｃ‥偏光板
２０‥バックライト
３０‥レンチキュラシート
３０ａ，３０ｂ，３０ｃ‥レンズ
矢印Ａ‥レンチキュラシートのレンズ母線方向
矢印Ｂ‥偏光板１０ｂの吸収軸方向
矢印Ｃ‥偏光板１０ｃの吸収軸方向 DESCRIPTION OF
Claims (5)
- 偏光板と液晶層と照明光源とを有する液晶ディスプレイと、
前記液晶ディスプレイの表示面側に設置され、母線方向が前記液晶ディスプレイの偏光板の吸収軸方向と略同一であるレンチキュラシートと、
を有することを特徴とする立体表示装置。 A liquid crystal display having a polarizing plate, a liquid crystal layer, and an illumination light source;
A lenticular sheet that is installed on the display surface side of the liquid crystal display and whose bus line direction is substantially the same as the absorption axis direction of the polarizing plate of the liquid crystal display;
A stereoscopic display device characterized by comprising: - 前記液晶ディスプレイの偏光板の吸収軸方向と略同一である前記母線方向は、
前記液晶ディスプレイの全傾斜角を平均したコントラストを最大値となる方位角を基準として、コントラスト最小値との差が３割以内の方位角の範囲となることを特徴とする請求項１に記載の立体表示装置。 The bus line direction, which is substantially the same as the absorption axis direction of the polarizing plate of the liquid crystal display,
The difference from the minimum contrast value is within an azimuth angle range of 30% or less with reference to an azimuth angle having a maximum contrast obtained by averaging all tilt angles of the liquid crystal display. 3D display device. - 前記液晶ディスプレイの偏光板の吸収軸方向と略同一である前記母線方向は、
前記液晶ディスプレイの全傾斜角を平均した黒表示輝度を最小値となる方位角を基準として、黒表示輝度最大値との差が３割以内の方位角の範囲となることを特徴とする請求項１に記載の立体表示装置。 The bus line direction, which is substantially the same as the absorption axis direction of the polarizing plate of the liquid crystal display,
The difference from the maximum value of black display luminance is within a range of azimuth within 30% with reference to an azimuth angle at which the black display luminance obtained by averaging all inclination angles of the liquid crystal display is a minimum value. 3. The stereoscopic display device according to 1. - 前記液晶ディスプレイの偏光板の吸収軸方向と略同一である前記母線方向は、
前記液晶ディスプレイのレンチキュラシート集光角度内の傾斜角を平均したコントラストを最大値となる方位角を基準として、コントラスト最小値との差が３割以内の方位角の範囲となることを特徴とする請求項１に記載の立体表示装置。 The bus line direction, which is substantially the same as the absorption axis direction of the polarizing plate of the liquid crystal display,
The difference from the minimum contrast value is within an azimuth angle range of 30% or less with reference to the azimuth angle having the maximum contrast obtained by averaging the inclination angles within the light collection angle of the lenticular sheet of the liquid crystal display. The stereoscopic display device according to claim 1. - 前記液晶ディスプレイの偏光板の吸収軸方向と略同一である前記母線方向は、
前記液晶ディスプレイのレンチキュラシート集光角度内の傾斜角を平均した黒表示輝度を最小値となる方位角を基準として、黒表示輝度最大値との差が３割以内の方位角の範囲となるレンチキュラシートと、
を有することを特徴とする請求項１に記載の立体表示装置。 The bus line direction, which is substantially the same as the absorption axis direction of the polarizing plate of the liquid crystal display,
The lenticular sheet in which the difference from the maximum black display luminance value is within 30% of the azimuth angle with the black display luminance obtained by averaging the inclination angles within the converging angle of the lenticular sheet of the liquid crystal display as a reference. Sheet,
The stereoscopic display device according to claim 1, comprising:
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