JP7316776B2 - 半導体装置 - Google Patents
半導体装置 Download PDFInfo
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- JP7316776B2 JP7316776B2 JP2018202120A JP2018202120A JP7316776B2 JP 7316776 B2 JP7316776 B2 JP 7316776B2 JP 2018202120 A JP2018202120 A JP 2018202120A JP 2018202120 A JP2018202120 A JP 2018202120A JP 7316776 B2 JP7316776 B2 JP 7316776B2
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- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
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- G09G3/3225—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix
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- G09G2320/0209—Crosstalk reduction, i.e. to reduce direct or indirect influences of signals directed to a certain pixel of the displayed image on other pixels of said image, inclusive of influences affecting pixels in different frames or fields or sub-images which constitute a same image, e.g. left and right images of a stereoscopic display
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Description
20 表示デバイス
21 表示電源部
133 階調電圧生成部
1330 基本階調電圧生成部
1331 ガンマ補正部
CP、CQ キャパシタ
H0、H0a 変動電圧重畳部
LD EL素子
PC 表示セル
Q1、Q2 トランジスタ
Claims (6)
- 表示データにて表される輝度レベルに対応した駆動信号を受けるソースラインと、電源電圧に基づき前記ソースラインで受けた前記駆動信号に対応した輝度で発光する表示セルと、を含む表示デバイスを駆動する半導体装置であって、
前記電源電圧を前記表示デバイスに供給する表示電源部と、
ガンマ特性に沿った第1~第k(kは2以上の整数)の代表階調電圧を生成し、前記第1~第kの代表階調電圧に基づき第1~第N(Nはkより大なる整数)の階調電圧を生成する階調電圧生成部と、
前記第1~第Nの階調電圧のうちから前記表示データに対応した1つの階調電圧を選択し、選択した前記1つの階調電圧を示す信号を前記駆動信号として前記ソースラインに印加する駆動部と、
前記表示デバイスに供給された前記電源電圧に電圧変動が生じた場合に、前記電源電圧から電圧変動分を抽出し、抽出した前記電圧変動分を、前記第1~第kの代表階調電圧のうちの少なくとも1つに重畳させる変動電圧重畳部と、を含み、
前記変動電圧重畳部は、
オペアンプと、
一端に前記第1~第kの代表階調電圧のうちの1つが印加されており、他端が前記オペアンプの非反転入力端子に接続されている第1の抵抗と、
一端に前記電源電圧が印加されており、他端が前記オペアンプの非反転入力端子に接続されている第2の抵抗と、
一端に前記電源電圧の基準となる基準電源電圧が印加されており、他端が前記オペアンプの反転入力端子に接続されている第3の抵抗と、
一端に前記オペアンプの反転入力端子が接続されており、他端が前記オペアンプの出力端子に接続されている第4の抵抗と、を有することを特徴とする半導体装置。 - 前記階調電圧生成部は、
互いに異なる電圧値を有する複数の基本階調電圧を生成する基本階調電圧生成部と、
前記複数の基本階調電圧のうちで赤色用のガンマ特性に沿ったk個を赤色用の第1~第kの代表階調電圧とし、前記赤色用の第1~第kの代表階調電圧に基づき赤色用の第1~第Nの階調電圧を生成する赤ガンマ補正回路と、
前記複数の基本階調電圧のうちで緑色用のガンマ特性に沿ったk個を緑色用の第1~第kの代表階調電圧とし、前記緑色用の第1~第kの代表階調電圧に基づき緑色用の第1~第Nの階調電圧を生成する緑ガンマ補正回路と、
前記複数の基本階調電圧のうちで青色用のガンマ特性に沿ったk個を青色用の第1~第kの代表階調電圧とし、前記青色用の第1~第kの代表階調電圧に基づき青色用の第1~第Nの階調電圧を生成する青ガンマ補正回路と、を含み、
前記変動電圧重畳部は、前記赤ガンマ補正回路、前記緑ガンマ補正回路、及び前記青ガンマ補正回路の各々において、前記第1~第kの代表階調電圧のうちの少なくとも1つに、前記電源電圧に生じた電圧変動に対応した電圧変動を生じさせることを特徴とする請求項1に記載の半導体装置。 - 前記変動電圧重畳部は、
前記第1~第kの代表階調電圧のうちで最大の電圧値を有する1つの代表階調電圧に、
前記電源電圧に生じた電圧変動に対応した電圧変動を生じさせることを特徴とする請求項1又は2に記載の半導体装置。 - 前記表示セルは、
発光素子と、
前記ソースラインで受けた前記駆動信号を自身の第1の電極で受け、第2の電極に前記電源電圧が印加されている保持キャパシタと、
前記電源電圧がソースに印加されていると共に前記駆動信号がゲートに供給されており、前記駆動信号に応じた電流を前記発光素子に供給するトランジスタと、を有することを特徴とする請求項1又は2に記載の半導体装置。 - 前記表示デバイスは、複数の前記表示セル各々に前記電源電圧を供給する電源供給ラインと、前記電源供給ラインに接続されている端子と、を有することを特徴とする請求項1又は4に記載の半導体装置。
- 前記変動電圧重畳部が、前記階調電圧生成部内に設けられていることを特徴とする請求項1~5のいずれか1に記載の半導体装置。
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