JP2017021064A - 画像生成装置、ヘッドアップディスプレイ - Google Patents
画像生成装置、ヘッドアップディスプレイ Download PDFInfo
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Abstract
Description
すなわち、本発明の第一の発明における画像生成装置は、異なる色のレーザー光を出射可能な複数の光源と、前記光源から前記レーザー光を受光し、前記レーザー光の偏光角を調整する液晶素子を含み、前記レーザー光の偏光角を調整することで前記レーザー光を調光する調光部と、前記液晶素子を制御することで前記レーザー光を調光するとともに、前記液晶素子の印加電圧を正極または負極に反転させる調光制御部と、前記調光部を通過した前記レーザー光を主走査方向に複数回走査しながら前記主走査方向と直交する副走査方向に走査することで画像を生成する走査部と、前記調光部を通過した後の前記レーザー光の光強度を検出する光検出部と、前記調光制御部が前記液晶素子の印加電圧を反転させるタイミングと異なるタイミングで前記光検出部が検出した前記異なる色のレーザー光の光強度に基づいて、前記複数の光源の出力をそれぞれ補正する光源補正部と、を備える、ことを特徴とする。
図2の画像生成部100は、レーザー光を二次元的に走査することで表示面(スクリーン103)上に画像Mを生成するものである。画像生成部100は、例えば、合成レーザー光Cを出射するレーザー光源部(レーザー光源装置)101と、レーザー光源部101が出射した合成レーザー光Cを走査する走査部102と、この走査部102により走査された合成レーザー光Cを受光して画像Mを表示するスクリーン103と、により主に構成される。
レーザー光源部101は、後述する合成レーザー光Cを走査部102に向け出射するものであり、例えば、合成レーザー光源部10と、レーザー光源部10における、後述する光源11,調光部14などを制御する制御部20と、により構成される。
走査部102は、レーザー光源部10からの合成レーザー光Cを受光し、後述する制御部20の制御のもとで、受光した合成レーザー光Cを、図4に示すように、スクリーン103上を主走査方向Xに複数回走査しながら副走査方向Yに走査し、所望の画像Mをスクリーン103上に表示する。
調光処理は、例えば、外光センサ500からの外部照度に基づき、明るい(外部照度が大きい)環境では、画像Mの輝度を増大させるように調光部14による光の減衰を抑え、暗い(外部照度が小さい)環境では、画像Mの輝度を減少させるように調光部14で光を減衰させる処理である。調光処理は、例えば、所定数のフレームFおき、又は所定時間おきに定期的に処理を開始する。
反転処理は、調光部14における液晶素子の焼きつきを防止するため、同じ大きさの印加電圧を正極及び負極でそれぞれ印加される期間割合が同じになるように駆動する処理である。具体的に例えば、処理部21は、1フレーム内で前記液晶素子を正極及び負極で駆動する期間割合を、50%ずつに設定し、1フレームFの半分で正極/負極を切り替える。
なお、フレーム期間F内で2色以上のレーザー光B,G,Rの光強度を検出してもよく、これにより、光強度補正処理にかかる時間を短くすることができ、迅速に光源11a,11b,11cそれぞれの出力を補正することが可能となる。
なお、本発明は、以上の実施形態及び図面によって限定されるものではない。本発明の要旨を変更しない範囲で、適宜、実施形態及び図面に変更(構成要素の削除も含む)を加えることが可能である。以下に、変形例の一例を記す。
また、調光部14は、合成レーザー光Cの光路上ではなく、合成される前のレーザー光B,G,Rのそれぞれに設けてもよく、斯かる構成により、レーザー光B,G,Rを個別に調光制御することができる。
2 車両
2a ウインドシールド
3 観察者
10 レーザー光源部
11 光源
14 調光部
14a 液晶素子
16 光検出部
20 制御部(調光制御部、光源補正部)
21 処理部
22 記憶部
23 入力部
100 画像生成部(画像生成装置)
101 レーザー光源部(レーザー光源装置)
102 走査部
103 スクリーン
200 第一反射部
300 第二反射部
400 筐体
500 外光センサ
C 合成レーザー光
C1 第一反射光
F フレーム(フレームの期間)
Fa 実走査期間
Fb 帰線期間
P1 走査開始位置
P2 表示開始位置
P3 表示終了位置
P4 走査終了位置
K 表示光
M 画像
Tp 正極を印加する期間
Tn 負極を印加する期間
U 期間
V 虚像
Claims (8)
- 異なる色のレーザー光を出射可能な複数の光源と、
前記光源から前記レーザー光を受光し、前記レーザー光の偏光角を調整する液晶素子を含み、前記レーザー光の偏光角を調整することで前記レーザー光を調光する調光部と、
前記液晶素子を制御することで前記レーザー光を調光するとともに、前記液晶素子の印加電圧を正極または負極に反転させる調光制御部と、
前記調光部を通過した前記レーザー光を主走査方向に複数回走査しながら前記主走査方向と直交する副走査方向に走査することで画像を生成する走査部と、
前記調光部を通過した後の前記レーザー光の光強度を検出する光検出部と、
前記調光制御部が前記液晶素子の印加電圧を反転させるタイミングと異なるタイミングで前記光検出部が検出した前記異なる色のレーザー光の光強度に基づいて、前記複数の光源の出力をそれぞれ補正する光源補正部と、を備える、
ことを特徴とする画像生成装置。 - 前記光源制御部は、前記異なる色のレーザー光の光強度の検出タイミングを、それぞれ、前記液晶素子の印加電圧が正極または負極のいずれか一方とする、
ことを特徴とする請求項1に記載の画像生成装置。 - 前記調光制御部は、所定の周期における正極を印加する期間と負極を印加する期間とが略均等になるように前記液晶素子を駆動する、
ことを特徴とする請求項1または請求項2に記載の画像生成装置。 - 前記光源は、前記光検出部で光強度を検出させるため、所定の期間に一定出力の検査用光を出射可能であり、
前記調光制御部は、前記液晶素子に正極または負極を連続して印加する期間を、前記検査用光を出射させる前記期間より長く設ける、
ことを特徴とする請求項1乃至3のいずれかに記載の画像生成装置。 - 前記調光制御部は、前記液晶素子に正極または負極を連続して印加する期間が、前記画像が生成されるフレームの期間と略均等となるように前記液晶素子を駆動する、
ことを特徴とする請求項1乃至3のいずれかに記載の画像生成装置。 - 前記調光制御部は、前記画像が生成されるフレームの期間内で正極を印加する期間と負極を印加する期間とが略均等になるように前記液晶素子を駆動する、
ことを特徴とする請求項1乃至3のいずれかに記載の画像生成装置。 - 前記調光制御部は、前記フレームの期間内における正極または負極の切り替えタイミングを、連続する前記フレーム間で異ならせる、
ことを特徴とする請求項6に記載の画像生成装置。 - 請求項1乃至7のいずれかに記載の画像生成装置と、
前記画像生成装置が生成した前記画像を透過反射部に投影するリレー光学系と、
外部照度を検出する外光センサと、を備え、
前記調光制御部は、前記光源補正部が、前記レーザー光の光強度を入力してから前記複数の光源の出力を補正するまでの期間を除くタイミングで前記レーザー光を調光する、
ことを特徴とするヘッドアップディスプレイ。
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