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    • 4. 发明授权
    • Display device
    • 显示设备
    • US07298347B2
    • 2007-11-20
    • US10347241
    • 2003-01-21
    • Shunpei YamazakiJun KoyamaKazue Hosoki
    • Shunpei YamazakiJun KoyamaKazue Hosoki
    • G09G3/14
    • G09G3/3233G09G3/2022G09G2300/0842G09G2310/027G09G2320/029G09G2320/041G09G2320/043G09G2320/045
    • The image quality of a display device using a bottom gate TFT is improved. In particular, fluctuation in luminance is controlled and the frequency characteristic of a driver circuit is compensated by suppressing a change in amount of current flowing through an EL element which is caused by a change in surrounding temperature while the device is in use. A monitoring EL element is provided in addition to a pixel portion EL element. The monitoring EL element constitutes a temperature compensation circuit together with a buffer amplifier and the like. A current is supplied to the pixel portion EL element through the temperature compensation circuit. This makes it possible to keep the amount of current flowing through the pixel portion EL element constant against a change in temperature, and to control the fluctuation in luminance. An input signal is subjected to time base expansion to perform sampling with accuracy.
    • 使用底栅TFT的显示装置的图像质量得到改善。 特别地,控制亮度的波动,并且通过抑制在器件使用期间由周围温度的变化引起的流过EL元件的电流量的变化来补偿驱动电路的频率特性。 除了像素部分EL元件之外还提供监视EL元件。 监视用EL元件与缓冲放大器等一起构成温度补偿电路。 通过温度补偿电路将电流提供给像素部分EL元件。 这使得可以保持流经像素部分EL元件的电流量相对于温度变化恒定,并且控制亮度的波动。 对输入信号进行时基扩展,以进行准确的采样。