Display drive device and display device

A display drive device for driving a plurality of display pixels, each of which includes a light emitting element and a driving element that supplies a current flowing into a current path thereof to the light emitting element, the display drive device comprising:

• a specific value detecting section which, in a state in which a predetermined voltage is supplied to a voltage supply line connected in common to the respective current paths of the driving elements of a plurality of the display pixels connected to the voltage supply line, detects for at least one of the plurality of display pixels connected to the voltage supply line a specific value corresponding to element characteristics of the driving element of the display pixel by:
• (i) generating an adjustment voltage based on a predetermined unit voltage and applying the generated adjustment voltage to the display pixel via a data line connected to the display pixel, (ii) detecting, as a detection value, one of a value of a potential difference between the data line and the voltage supply line, and a value of a current flowing in the current path of the driving element of the display pixel via the voltage supply line, and (iii) detecting the specific value of the display pixel based the detection value;
• and
• a voltage adjusting circuit which generates a correction gradation voltage by correcting, based on the specific value detected for the display pixel, a gradation voltage for the display pixel which has a voltage value for causing the light emitting element of the display pixel to emit light at a luminance gradation corresponding to display data, and supplies the generated correction gradation voltage to the display pixel via the data line connected to the display pixel.

A display device for displaying image information corresponding to display data, comprising:

• a display panel including:
• (i) a plurality of selection scan lines arranged in rows and a plurality of data lines arranged in columns;
• (ii) a plurality of display pixels arranged in a matrix shape, each of the display pixels being arranged in a vicinity of a point at which one of the plurality of selection scan lines crosses one of the plurality of data lines, and each of the display pixels including a light emitting element and a driving element that supplies a current flowing into a current path thereof to the light emitting element;
• and (iii) a voltage supply line connected in common to the respective current paths of the driving elements of a predetermined number of the plurality of display pixels;
• a voltage source which supplies a predetermined voltage to the voltage supply line;
• a selection drive circuit which applies a selection signal to the selection scan lines that correspond to rows of the display pixels that are connected to the voltage supply line, so as to set the rows of the display pixels to a selected state;
• a specific value detecting section which, for any row that is selected by the selection signal when the predetermined voltage is applied from the voltage source to the voltage supply line, detects for at least one of the plurality of display pixels in the row a specific value corresponding to element characteristics of the driving element of the display pixel by:
• (i) generating an adjustment voltage based on a predetermined unit voltage and applying the generated adjustment voltage to the display pixel via one of the plurality of data lines connected thereto;
• (ii) detecting, as a detection value, one of a value of a potential difference between the data line and the voltage supply line, and a value of a current flowing into the current path of the driving element of the display pixel via the voltage supply line;
• and (iii) detecting the specific value for the display pixel based on the detection value;
• and
• a voltage adjusting circuit which generates a correction gradation voltage by correcting, based on the specific value detected for the display pixel, a gradation voltage for the display pixel which has a voltage value for causing the light emitting element of the display pixel to emit light at a luminance gradation corresponding to display data, and supplies the generated correction gradation voltage to the display pixel via the data line connected to the display pixel.

Method for driving a display drive device for driving a plurality of display pixels, each of which includes a light emitting element and a driving element that supplies a current flowing to a current path thereof to the light emitting element, the method comprising:

• supplying a predetermined voltage to a voltage supply line connected in common to the respective current paths of the driving elements of a plurality of the display pixels;
• performing a process to detect a specific value corresponding to element characteristics of the driving element of at least one of the display pixels connected to the voltage supply line, the process comprising:
• generating an adjustment voltage based on a predetermined unit voltage;
• applying the generated voltage to the display pixel via a data line connected to the display pixel;
• and
• detecting the specific value for the display pixel, based on a detection value which is one of a value of a potential difference between the data line and the voltage supply line and a value of a current flowing into the current path of the driving element of the display pixel via the voltage supply line;
• generating a gradation voltage having a voltage value for causing the light emitting element of the display pixel to emit light at a luminance gradation corresponding to display data;
• generating a correction gradation voltage by correcting the gradation voltage based on the specific value detected for the display pixel;
• and
• supplying the generated correction gradation voltage via the data line connected to the display pixel.