Patent ID: 8279203
Filing Date: 2012-10-02
Classification: G09G

Abstract:
1. An image display device comprising: an analogue image signal voltage generating circuit for supplying an analogue image signal voltage; pixels each having an OLED element, a drive TFT, a reset switch, and a memory capacitor; and a display unit in which a plurality of said pixels are arranged, wherein the pixels comprise a first group of pixels and a second group of pixels, the first group of pixels are located in a first area for displaying mainly texts and icons, and the second group of pixels are located in a second area for displaying mainly natural pictures, wherein, in each pixel, and wherein a first pixel drive signal line is connected to respective second ends of the memory capacitors in the pixels arranged in the first group of the pixels, a second pixel drive signal line is connected to respective second ends of the memory capacitors in the pixels arranged in the second group of the pixels, while the reset switch is turned ON, the analogue image signal voltage is inputted from the image signal lines to the second ends of memory capacitors in the pixels, while the reset switch is turned OFF, a constant voltage is applied from the first pixel drive signal line to the second ends of the memory capacitors in the pixels arranged in the first group of pixels such that the light emission brightness of the first group of pixels is modulated in response to a drive voltage applied to each drive TFT in each pixel of the first group of pixels being a difference between the analogue image signal voltage and the constant voltage, and a symmetric triangular waveform is applied from the second pixel drive signal line to the second ends of the memory capacitors in the pixels arranged in the second group of pixels such that light emission brightness of the second group of pixels is modulated in response to a drive voltage applied to each drive TFT in each pixel of the second group of pixels being a difference between the analogue image signal voltage and the symmetric triangular waveform, and the first group of pixels and the second group of pixels are substantially equal in emission spectrum and differ from each other in light emission brightness for the same level of said analogue image signal voltage supplied by said analogue image signal voltage generating circuit.