JP2020190677A5

JP2020190677A5 -

Info

Publication number: JP2020190677A5
Application number: JP2019096807A
Authority: JP
Filing date: 2019-05-23
Publication date: 2021-11-18
Anticipated expiration: 2039-05-23

Description

上記目的を達成するため、請求項１に記載の発明は、車両（Ｖ）に搭載され、投影部材（２）における投影面（３）に表示画像を投影し、表示画像の光が投影面に投影されることで表示画像の虚像を表示するヘッドアップディスプレイ装置であって、表示画像の光を投射する投射器（２０）と、投射器からの表示画像の光を投影部材へ向けて導光する導光部（４０）と、開口部（１１）が形成されており、投射器および導光部を収容すると共に開口部を通じて導光部にて導光された表示画像の光を投影部材に導くハウジング（１０）と、導光部と投影部材との間の光路上に配置された偏光機能を有するベゼル偏光板（６２）を含み、開口部からハウジング内への塵の侵入を抑制するベゼル部材（６０）と、を備え、ベゼル偏光板は、偏光により、該ベゼル偏光板を透過する前よりも透過した後の方が、表示画像の光のうちのｐ波の輝度をｓ波の輝度よりも高くし、導光部とベゼル部材との間には、車体側偏光板（５０）が備えられ、車体側偏光板は、偏光により、該車体側偏光板を透過する前よりも透過した後の方が、表示画像の光のうちのｓ波の輝度をｐ波の輝度よりも高くする。 In order to achieve the above object, the invention according to claim 1 is mounted on a vehicle (V), projects a display image on a projection surface (3) in a projection member (2), and the light of the display image is projected on the projection surface. A head-up display device that displays a virtual image of a displayed image by being projected, and guides the light of the display image from the projector (20) that projects the light of the display image to the projection member. A light guide portion (40) and an opening portion (11) are formed, and the light of the display image guided by the light guide portion through the light guide portion while accommodating the projector and the light guide portion is applied to the projection member. A bezel that includes a guiding housing (10) and a bezel polarizing plate (62) having a polarizing function arranged on an optical path between a light guide portion and a projection member, and suppresses dust from entering the housing through an opening. The bezel polarizing plate includes the member (60), and the bezel polarizing plate changes the brightness of the p-wave of the light of the display image to the brightness of the s-wave after the light transmitted through the bezel polarizing plate by polarization. A vehicle body side polarizing plate (50) is provided between the light guide portion and the bezel member, and the vehicle body side polarizing plate is transmitted by polarization more than before being transmitted through the vehicle body side polarizing plate. Later, the brightness of the s wave in the light of the display image is made higher than the brightness of the p wave.

平面鏡４２は、液晶パネル３０から出射された表示画像の光を凹面鏡４４に向けて反射する。凹面鏡４４は、平面鏡４２から伝えられた表示画像の光をウインドシールド２に向けて反射するものであり、凹面鏡４４の中心が凹む曲面状の反射鏡とされている。 The plane mirror 42 reflects the light of the display image emitted from the liquid crystal panel 30 toward the concave mirror 44. The concave mirror 44 reflects the light of the display image transmitted from the plane mirror 42 toward the windshield 2, and is a curved reflector in which the center of the concave mirror 44 is recessed.

偏光板６２は、上記した偏光素子層５２と同様のもので構成されることで２つ目の偏光板を構成しており、図３に示すように、透過軸６２ａと遮光軸６２ｂとが互いに直交した状態となっている。ただし、偏光板６２の透過軸６２ａと遮光軸６２ｂは、それぞれ、偏光素子層５２の透過軸５２ａと遮光軸５２ｂに対して方位角がずらしてある。 The polarizing plate 62 is composed of the same polarizing element layer 52 as described above to form a second polarizing plate, and as shown in FIG. 3 , the transmission shaft 62a and the light-shielding shaft 62b are mutual to each other. It is in an orthogonal state. However, the transmission shaft 62a and the light-shielding shaft 62b of the polarizing plate 62 are offset in azimuth with respect to the transmission shaft 52a and the light-shielding shaft 52b of the polarizing element layer 52, respectively.

ベゼル６４は、図６Ａおよび図６Ｂに示すように、ハウジング１０の開口部１１の入口の位置においてインストルメントパネル１の開口部に嵌め込まれる枠体形状で構成されており、本実施形態では四角形枠体形状とされている。このベゼル６４の底部、つまり開口部１１への挿入方向先端に偏光板６２が固定されており、ベゼル６４を開口部１１に嵌め込むことにより、偏光板６２が開口部１１を塞ぐように設置されるようになっている。本実施形態では、ベゼル６４の底部、つまりベゼル６４のうち表示画像の光の光路の上流側となる導光部４０側の端部に対して、偏光板６２が溶着などによって接合されている。そして、偏光板６２により、ベゼル６４の開口部が全域覆われている。このように構成された偏光板５０および偏光板６２を通じて表示画像の光がウインドシールド２の投影面３に導かれ、投影面３にて表示画像が投影されることにより、ドライバに表示画像の虚像４が視認可能となる。 As shown in FIGS. 6A and 6B, the bezel 64 has a frame shape that is fitted into the opening of the instrument panel 1 at the position of the entrance of the opening 11 of the housing 10, and is a quadrangular frame in the present embodiment. It is said to have a body shape. The polarizing plate 62 is fixed to the bottom of the bezel 64, that is, the tip in the insertion direction into the opening 11, and the polarizing plate 62 is installed so as to close the opening 11 by fitting the bezel 64 into the opening 11. It has become so. In the present embodiment, the polarizing plate 62 is joined to the bottom of the bezel 64, that is, the end of the bezel 64 on the light guide portion 40 side, which is the upstream side of the optical path of the light of the display image, by welding or the like. The polarizing plate 62 covers the entire opening of the bezel 64 . The light of the display image is guided to the projection surface 3 of the windshield 2 through the polarizing plate 50 and the polarizing plate 62 configured in this way, and the display image is projected on the projection surface 3, so that the driver has a virtual image of the display image. 4 becomes visible.

なお、数１、２において、Ｉ_０はウインドシールド２への入射時の表示画像の光の輝度である。αは、サングラス吸収軸Ｄｓａと、ウインドシールド２に反射された後の表示画像の光の偏光方向とがなす角である。βは、サングラス吸収軸Ｄｓａと、偏光板５０の透過軸５２ａとのなす角である。また、図５に示すように、θは、サングラス透過軸Ｄｓｔと、ウインドシールド２に反射される表示画像の光の反射断面の接線方向Ｄｒｔとがなす角である。ここで反射断面とは、ウインドシールド２に入射し、反射される光線と、当該入射および反射位置におけるウインドシールド２の法線とを含む平面であり、一般的に入射面とも呼ばれている。Ｒｓは、ウインドシールド２のｓ偏光反射率である。Ｒｐは、ウインドシールド２のｐ偏光反射率である。Ｔは、偏光サングラス７のサングラス透過軸Ｄｓｔに沿った偏光に対する透過率である。

_{In the equations} 1 and 2, I 0 is the brightness of the light of the display image at the time of incident on the windshield 2. α is an angle formed by the sunglasses absorption axis Dsa and the polarization direction of the light of the display image after being reflected by the windshield 2. β is an angle formed by the absorption axis Dsa of sunglasses and the transmission axis 52a of the polarizing plate 50. Further, as shown in FIG. 5, θ is an angle formed by the sunglasses transmission axis Dst and the tangential direction Drt of the reflection cross section of the light of the display image reflected by the windshield 2. Here, the reflected cross section is a plane including a light ray incident on the windshield 2 and reflected, and a normal line of the windshield 2 at the incident and reflected positions, and is generally also called an incident surface. Rs is the s polarization reflectance of the windshield 2. Rp is the p-polarized reflectance of the windshield 2. T is the transmittance of the polarized sunglasses 7 with respect to the polarized light along the sunglasses transmission axis Dst.

なお、α_０は、サングラス吸収軸Ｄｓａと、偏光板５０に入射する表示画像の光の偏光方向とがなす角である。

Note that α ₀ is an angle formed by the sunglasses absorption axis Dsa and the polarization direction of the light of the display image incident on the polarizing plate 50 .

このように、枠体部６２ｅを用いて偏光板６２とベゼル６４とを爪部６４ｂと爪受け部６２ｆで固定する構造としても良い。このような構造のベゼル部材６０を用いても、第１実施形態と同様の効果が得られる。 As described above, the polarizing plate 62 and the bezel 64 may be fixed by the claw portion 64b and the claw receiving portion 62f using the frame body portion 62e. Even if the bezel member 60 having such a structure is used, the same effect as that of the first embodiment can be obtained.

Claims

A head mounted on a vehicle (V), projecting a display image on a projection surface (3) of a projection member (2), and projecting the light of the display image onto the projection surface to display a virtual image of the display image. It ’s an up-display device.
A projector (20) that projects the light of the displayed image,
A light guide unit (40) that guides the light of the display image from the projector to the projection member, and
Opening (11) is formed, guiding the light of said display image guided by the light guide portion through the opening accommodates the projector and the light guide portion to said projection member housing ( 10) and
A bezel member (60) including a bezel polarizing plate (62) having a polarizing function arranged on an optical path between the light guide portion and the projection member and suppressing dust from entering the housing through the opening. ) And,
The bezel polarizing plate is polarized so that the brightness of the p wave in the light of the display image is higher than the brightness of the s wave after the light is transmitted through the bezel polarizing plate than before.
A polarizing plate (50) on the vehicle body side is provided between the light guide portion and the bezel member.
The body-side polarizing plate is polarized so that the brightness of the s wave in the light of the display image is higher than the brightness of the p-wave after the light transmitted through the body-side polarizing plate is higher than that before the light is transmitted through the body-side polarizing plate. Head-up display device.

The bezel polarizing plate is arranged along the vehicle body side polarizing plate, and is arranged.
An antireflection film (56, 68) is provided on at least one of the surface of the bezel polarizing plate on the vehicle body side and the surface of the bezel polarizing plate on the vehicle body side. The head-up display device according to claim 1.

A control unit (70) that controls the amount of light emitted from the light source (22) of the projector,
It has a changeover switch (74) that outputs a signal indicating that the bezel member is mounted, and has.
Based on the ambient illuminance of the vehicle, the control unit controls to increase the amount of light emitted as the ambient illuminance becomes higher when the ambient illuminance is lower than the predetermined illuminance, while the bezel polarizing plate is controlled by the changeover switch. The invention according to claim 1 or 2 , wherein when a signal indicating that the bezel member is attached is input, the amount of light emitted corresponding to the ambient illuminance is reduced as compared with the case where the bezel member is not attached. Head-up display device.

A head mounted on a vehicle (V), projecting a display image on a projection surface (3) of a projection member (2), and projecting the light of the display image onto the projection surface to display a virtual image of the display image. It ’s an up-display device.
A projector (20) that projects the light of the displayed image,
A light guide unit (40) that guides the light of the display image from the projector to the projection member, and
A housing (11) is formed to accommodate the projector and the light guide, and to guide the light of the display image guided by the light guide through the opening to the projection member (11). 10) and
A bezel member (60) including a bezel polarizing plate (62) having a polarizing function arranged on an optical path between the light guide portion and the projection member and suppressing dust from entering the housing through the opening. )When,
A control unit (70) that controls the amount of light emitted from the light source (22) of the projector,
A changeover switch (74) for outputting a signal indicating that the bezel member is attached is provided.
The bezel polarizing plate is polarized so that the brightness of the p wave in the light of the display image is higher than the brightness of the s wave after the light is transmitted through the bezel polarizing plate than before.
Based on the ambient illuminance of the vehicle, the control unit controls to increase the amount of light emitted as the ambient illuminance becomes higher when the ambient illuminance is lower than the predetermined illuminance, while the bezel polarizing plate is controlled by the changeover switch. A head-up display device that reduces the amount of light emitted corresponding to the ambient illuminance when a signal indicating that the bezel member is attached is input, as compared with the case where the bezel member is not attached.

The head-up display device according to any one of claims 1 to 4 , wherein the bezel member is a frame-shaped bezel (64) in which the bezel polarizing plate is integrated.

The fifth aspect of the present invention, wherein the bezel polarizing plate is joined to an end portion of the frame-shaped bezel on the light guide portion side, and the opening of the bezel is closed by the bezel polarizing plate. The head-up display device described.

The bezel polarizing plate is attached to the bezel by engaging the claw portion (64a) provided on one of the bezel and the bezel polarizing plate and the claw receiving portion (62f) provided on the other. The head-up display device according to claim 5 or 6 , which is fixed.

The bezel polarizing plate is integrated with a frame body portion (62e) fitted in the bezel.
One of the claw portion and the claw receiving portion is provided in the frame body portion, and the claw portion and the claw receiving portion are engaged with each other by fitting the frame body portion into the bezel. The head-up display device according to claim 7.