A signal processing device configured to output image frame data for a display, the device comprising: an input interface configured to receive an image signal; a first image processor configured to perform first scaling based on the image signal so that the resolution of first image frame data (ImgL) generated by the first scaling is consistent with the resolution of a panel of the display, and to output the first image frame data (ImgL) generated by the first scaling to an output interface; a second image processor configured to perform second scaling based on the image signal, and to output second image frame data (ImgS) generated by the second scaling to the output interface, wherein the second image frame data (ImgS) is scaled down as compared to the first image frame data (ImgL); and the output interface, configured to receive the first image frame data from the first image processor and the second image frame data from the second image processor; wherein the signal processing device is configured to determine whether an image output mode is a normal mode or a low delay mode, wherein, when the image output mode is the normal mode, the output interface is configured to output, as the image frame data for the display, first image frame data (ImgL) and the second image frame data (ImgS), and to delay the output of the first image frame data (ImgL) with respect to the output of the second image frame data (ImgS), wherein, when the image output mode is the low delay mode, the signal processing device is configured to cause the second scaling to be bypassed such that the second image frame data is not generated, and the output interface is configured to output, as the image frame data for the display, the first image frame data (ImgL) and to not output the second image frame data (ImgS). an input interface configured to receive an image signal; a first image processor configured to perform first scaling based on the image signal so that the resolution of first image frame data (ImgL) generated by the first scaling is consistent with the resolution of a panel of the display, and to output the first image frame data (ImgL) generated by the first scaling to an output interface; a second image processor configured to perform second scaling based on the image signal, and to output second image frame data (ImgS) generated by the second scaling to the output interface, wherein the second image frame data (ImgS) is scaled down as compared to the first image frame data (ImgL); and the output interface, configured to receive the first image frame data from the first image processor and the second image frame data from the second image processor; wherein the signal processing device is configured to determine whether an image output mode is a normal mode or a low delay mode, wherein, when the image output mode is the normal mode, the output interface is configured to output, as the image frame data for the display, first image frame data (ImgL) and the second image frame data (ImgS), and to delay the output of the first image frame data (ImgL) with respect to the output of the second image frame data (ImgS), wherein, when the image output mode is the low delay mode, the signal processing device is configured to cause the second scaling to be bypassed such that the second image frame data is not generated, and the output interface is configured to output, as the image frame data for the display, the first image frame data (ImgL) and to not output the second image frame data (ImgS).