Display device
View Patent ↗In an embodiment of the present invention, basic reference voltages VRT, VRB, VR, VG, and VB are divided by resistors to produce plural reference voltages V 0 to V 15 , and voltages are selected from these plural reference voltages V 0 to V 15 for digital-analog conversion processing of image data DR, DG, and DB. At least the basic reference voltage VRB for the black level is shared by the respective color data DR, DG, and DB. The basic reference voltages VR, VG, and VB for setting of an intermediate grayscale closer to the black level can be varied individually for each of the color data DR, DG, and DB. When this embodiment is applied to a display device employing current-driven light-emitting elements such as organic EL elements, contrast deterioration due to floating black and sinking black can be prevented with a simple configuration.
1. A display device in which image data is subjected to digital-analog conversion processing to produce a drive signal and a display part formed by arranging pixels each employing a current-driven light-emitting element in a matrix is driven based on the drive signal, the display device comprising:
a basic reference voltage generation circuit configured to generate a plurality of basic reference voltages by varying a voltage in accordance with control data; and
a plurality of voltage divider circuits configured to each produce a plurality of reference voltages by dividing the plurality of basic reference voltages by resistors, for a respective one of color data included in the image data; wherein
at least the basic reference voltage corresponding to a black level is supplied to the plurality of voltage divider circuits in common, and
the basic reference voltages closer to the black level than a voltage corresponding to a center value of the drive signal are each supplied to a respective one of the plurality of voltage divider circuits for a respective one of the color data.
2. The display device according to claim 1 , wherein
the basic reference voltage corresponding to a white level is supplied to the plurality of voltage divider circuits in common.
3. The display device according to claim 1 , wherein
the basic reference voltages corresponding to a white level are each supplied to a respective one of the plurality of voltage divider circuits for a respective one of the color data.
4. The display device according to claim 1 , wherein
the plurality of basic reference voltages are composed of the basic reference voltage corresponding to the black level, the basic reference voltage corresponding to a white level, and the basic reference voltages closer to the black level than the voltage corresponding to the center value of the drive signal.
5. The display device according to claim 1 , wherein
the plurality of basic reference voltages are composed of the basic reference voltage corresponding to the black level, the basic reference voltage corresponding to a white level, the basic reference voltages closer to the black level than the voltage corresponding to the center value of the drive signal, and the basic reference voltages closer to the white level than the voltage corresponding to the center value of the drive signal.