| 主权项 |
1. An active-matrix display device comprising:
a plurality of video signal lines configured to transmit signals representing an image to be displayed; a plurality of scanning signal lines crossing the video signal lines; a plurality of pixel circuits arranged in a matrix corresponding to intersections of the video signal lines and the scanning signal lines, to display a plurality of pixels forming the image to be displayed; a power line for providing a power supply voltage to the pixel circuits; a scanning signal line driver circuit configured to selectively drive the scanning signal lines; a frame memory configured to store externally provided display data signals for one frame and to sequentially output the stored display data signals for one frame as previous frame display data; a tone voltage generation portion configured to generate a plurality of tone voltages on the basis of reference voltages for voltages to be applied to the video signal lines, wherein the tone voltage generation portion comprises:
a voltage drop amount calculation portion configured to calculate the voltage drop amount on the basis of a value obtained by integrating tone values indicating display luminances of at least a part of the pixels;a reference voltage setting portion configured to set maximum and minimum values for the tone voltages as reference voltages on the basis of the voltage drop amount; anda tone voltage output portion configured to generate and output tone voltage values on the basis of the maximum and minimum values of the reference voltages, wherein
the tone voltage output portion is a resistive voltage division circuit configured to divide a voltage into voltages ranging from the maximum to the minimum values, the resistive voltage division circuit consisting of a plurality of resistors, the number of which is less than or equal to the number of tone voltages, andthe plurality of resistors respectively have values that are given by the following equation: Rn=(n1.1−(n−1)1.1)·R, where R denotes a value of a first resistor that is defined as a resistor having a terminal provided with the maximum voltage among the plurality of resistors and Rn denotes a value of an n-th resistor among the plurality of resistors; a video signal line driver circuit configured to generate the signals representing the image to be displayed by respectively selecting tone voltages for the plurality of video signal lines from among the plurality of tone voltages based on the previous frame display data, and configured to drive the video signal lines by applying the signals representing the image to be displayed; and a power supply circuit configured to provide a power supply voltage to the power line, wherein
the pixel circuits include respective electro-optical elements driven by a current provided through the power line; andthe tone voltage generation portion is configured to calculate a voltage drop amount of the power line due to the image being displayed, on the basis of tone values included in the externally provided display data signals and indicating display luminances of the pixels, without performing measurement for detection of the voltage drop amount, and is configured to set the reference voltage on the basis of the calculated voltage drop amount. |
