JP2021526327A - 拡張されたダイナミックレンジをもつデジタルピクセル - Google Patents
拡張されたダイナミックレンジをもつデジタルピクセル Download PDFInfo
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Abstract
Description
本特許出願は、その全体がすべての目的のために参照により本明細書に組み込まれる、2018年6月11日に出願された、「DIGITAL PIXEL SENSOR WITH MULTIPLE QUANTIZATION MODES」と題する米国仮特許出願第62/683,550号、および2019年6月7日に出願された、「DIGITAL PIXEL WITH EXTENDED DYNAMIC RANGE」と題する米国特許出願第16/435,451号の優先権を主張する。
Claims (20)
- フォトダイオードと、
電荷貯蔵ユニットと、
処理回路であって、
第1の電圧を生じさせるために、前記フォトダイオードから前記電荷貯蔵ユニットにオーバーフロー電荷を転送することと、
第1の判定を生成するために、前記第1の電圧を第1のランピングしきい値電圧と比較することと、
前記第1の判定に基づいて、第1のデジタル値を生成することと、
第2の電圧を生じさせるために、前記フォトダイオードから前記電荷貯蔵ユニットに残留電荷を転送することと、
前記フォトダイオードが飽和したかどうかを判定して第2の判定を生成するために、前記第2の電圧を静的しきい値電圧と比較することと、
第3の判定を生成するために、前記第2の電圧を第2のランピングしきい値電圧と比較することと、
前記第3の判定に基づいて、第2のデジタル値を生成することと、
前記第2の判定に基づいて、前記フォトダイオードによって受け取られた光の強度を表すための、前記第1のデジタル値または前記第2のデジタル値のうちの1つを出力することと
を行うように構成された、処理回路と
を備える装置。 - 前記静的しきい値電圧が、前記フォトダイオードの飽和容量に等しい量の前記残留電荷を貯蔵したときに前記電荷貯蔵ユニットで生じた第3の電圧に基づく、請求項1に記載の装置。
- 前記静的しきい値電圧が、暗電流によって溜められた暗電荷を表す電圧オフセットにさらに基づく、請求項2に記載の装置。
- 前記第2のランピングしきい値電圧が、前記静的しきい値電圧から開始または終了する、請求項3に記載の装置。
- カウンタと、
メモリと
をさらに備え、
前記処理回路が、
前記第1の判定に基づいて、前記カウンタからの第1のカウント値を前記第1のデジタル値として前記メモリに記憶することと、
前記第3の判定に基づいて、前記カウンタからの第2のカウント値を前記第2のデジタル値として前記メモリに記憶することと、
前記第2の判定に基づいて、前記第1のデジタル値または前記第2のデジタル値のうちの1つを前記メモリから出力することと
を行うように構成される、
請求項1に記載の装置。 - 前記処理回路が、前記第2の判定に基づいて、前記メモリ内で前記第2のカウント値で前記第1のカウント値を上書きするように構成される、請求項5に記載の装置。
- レジスタをさらに備え、
前記処理回路が、
前記第2の判定を指示する第1のフラグ値を前記レジスタに記憶することと、
前記レジスタからの前記第1のフラグ値に基づいて、前記第1のデジタル値または前記第2のデジタル値のうちの1つを前記メモリから出力することと
を行うように構成される、請求項5に記載の装置。 - 前記処理回路が、
前記第1のランピングしきい値電圧が第1のブレークポイント電圧に達したときに、前記第1の判定のステータスを決定することと、
前記第1の判定の前記ステータスを指示する第2のフラグ値を前記レジスタに記憶することと、
前記レジスタからの前記第1のフラグ値および前記第2のフラグ値に基づいて、前記第1のデジタル値または前記第2のデジタル値のうちの1つを出力することと
を行うように構成される、
請求項7に記載の装置。 - 前記処理回路が、前記第1のランピングしきい値電圧が前記第1のブレークポイント電圧に達したときに、前記カウンタをリセットするように構成される、請求項8に記載の装置。
- 前記処理回路が、
前記第2のランピングしきい値電圧が第2のブレークポイント電圧に達したときに、前記第3の判定のステータスを決定することと、
前記第3の判定の前記ステータスを指示する第2のフラグ値を前記レジスタに記憶することと、
前記レジスタからの前記第1のフラグ値および前記第2のフラグ値に基づいて、前記第1のデジタル値または前記第2のデジタル値のうちの1つを出力することと
を行うように構成される、
請求項7に記載の装置。 - 前記処理回路が、前記第1のランピングしきい値電圧が前記第2のブレークポイント電圧に達したときに、前記カウンタをリセットするように構成される、請求項10に記載の装置。
- 前記静的しきい値電圧が、第1の静的しきい値電圧であり、
前記処理回路が、
第4の判定を生成するために、前記第1の電圧を、前記電荷貯蔵ユニットの飽和容量を表す第2の静的しきい値電圧と比較することと、
前記第4の判定を指示する第2のフラグ値を前記レジスタに記憶することと、
前記第4の判定に基づいて、前記カウンタからの第3のカウント値を第3のデジタル値として記憶することと、
前記第1のフラグ値および前記第2のフラグ値に基づいて、前記フォトダイオードによって受け取られた光の前記強度を表すための、前記第1のデジタル値、前記第2のデジタル値、または前記第3のデジタル値のうちの1つを出力することと
を行うように構成される、
請求項7に記載の装置。 - 前記処理回路が、
所定の時間期間内に前記第1の電圧を前記第2の静的しきい値電圧と比較することと、
前記時間期間の所定の部分が経過したときに、前記第4の判定の第1のステータスを決定することと、
前記第4の判定の前記第1のステータスを指示する前記第1のフラグ値を前記レジスタに記憶することと、
前記時間期間が経過したときに、前記第4の判定の第2のステータスを決定することと、
前記第4の判定の前記第2のステータスを指示する前記第2のフラグ値を前記レジスタに記憶することと、
前記第1のフラグ値および前記第2のフラグ値に基づいて、前記フォトダイオードによって受け取られた光の前記強度を表すための、前記第1のデジタル値、前記第2のデジタル値、または前記第3のデジタル値のうちの1つを出力することと
を行うように構成される、請求項12に記載の装置。 - 前記処理回路が、前記時間期間の前記所定の部分が経過したときに、前記カウンタをリセットするように構成される、請求項13に記載の装置。
- 前記電荷貯蔵ユニットの電荷貯蔵容量が、前記処理回路によって構成可能であり、
前記処理回路が、
前記第1の電圧を生じさせるために、第1の容量を有するように前記電荷貯蔵ユニットを構成することと、
前記第2の電圧を生じさせるために、前記第1の容量より小さい第2の容量を有するように前記電荷貯蔵ユニットを構成することと
を行うように構成される、
請求項1に記載の装置。 - 前記電荷貯蔵ユニットが、フローティングドレインノードおよびキャパシタを備える、請求項15に記載の装置。
- 第1の電圧を生じさせるために、フォトダイオードから電荷貯蔵ユニットにオーバーフロー電荷を転送することと、
第1の判定を生成するために、前記第1の電圧を第1のランピングしきい値電圧と比較することと、
前記第1の判定に基づいて、第1のデジタル値を生成することと、
第2の電圧を生じさせるために、前記フォトダイオードから前記電荷貯蔵ユニットに残留電荷を転送することと、
前記フォトダイオードが飽和したかどうかを判定して第2の判定を生成するために、前記第2の電圧を静的しきい値電圧と比較することと、
第3の判定を生成するために、前記第2の電圧を第2のランピングしきい値電圧と比較することと、
前記第3の判定に基づいて、第2のデジタル値を生成することと、
前記第2の判定に基づいて、前記フォトダイオードによって受け取られた光の強度を表すための、前記第1のデジタル値または前記第2のデジタル値のうちの1つを出力することと
を含む、方法。 - 前記静的しきい値電圧が、前記フォトダイオードの飽和容量に等しい量の前記残留電荷を貯蔵したときに前記電荷貯蔵ユニットで生じた第3の電圧に基づき、暗電流によって溜められた暗電荷を表す電圧オフセットに基づく、請求項17に記載の方法。
- 前記第2のランピングしきい値電圧が、前記静的しきい値電圧から開始または終了する、請求項17に記載の方法。
- 前記第1の判定に基づいて、カウンタからの第1のカウント値を前記第1のデジタル値としてメモリに記憶することと、
前記第3の判定に基づいて、前記カウンタからの第2のカウント値を前記第2のデジタル値として前記メモリに記憶することと、
前記第2の判定に基づいて、前記第1のデジタル値または前記第2のデジタル値のうちの1つを前記メモリから出力することと
をさらに含む、請求項17に記載の方法。
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US201862683550P | 2018-06-11 | 2018-06-11 | |
US62/683,550 | 2018-06-11 | ||
US16/435,451 US11906353B2 (en) | 2018-06-11 | 2019-06-07 | Digital pixel with extended dynamic range |
US16/435,451 | 2019-06-07 | ||
PCT/US2019/036484 WO2019241205A1 (en) | 2018-06-11 | 2019-06-11 | Digital pixel with extended dynamic range |
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