Method of sensing illuminance using passive matrix organic light emitting diode display including illuminance sensor function and method of controlling the same

A method of sensing an illuminance in a passive matrix organic light emitting diode display, the display including a plurality of lower electrode patterns arranged in parallel, a plurality of transparent electrode patterns arranged in parallel and being perpendicular to the lower electrode patterns, and an organic compound layer interposed between the lower electrode pattern and the transparent electrode pattern, the method comprising steps of:

• providing a reference transparent electrode pattern and a comparison transparent electrode pattern selected from the transparent electrode patterns;
• providing a reference lower electrode pattern and a comparison lower electrode pattern selected from the lower electrode patterns, corresponding to the reference transparent electrode pattern and the comparison transparent electrode pattern;
• blocking light flowing into the organic compound layer between the comparison transparent electrode pattern and the comparison lower electrode pattern;
• and
• measuring an illuminance by comparing an electric feature formed by the reference transparent electrode pattern and the reference lower electrode pattern with an electric feature formed by the comparison transparent electrode pattern and the comparison lower electrode pattern under the same condition.

A method of controlling a passive matrix organic light emitting diode display, the display including a plurality of lower electrode patterns arranged in parallel, a plurality of transparent electrode patterns arranged in parallel and being perpendicular to the lower electrode patterns, and an organic compound layer interposed between the lower electrode pattern and the transparent electrode pattern, to perform display output, illuminance sensing and touch sensing by time-sharing a control of the lower electrode patterns and the transparent electrode patterns into a display control period, an illuminance sensing period and a touch sensor control period for each display frame time, the method comprising steps of:

• providing a driving node, which is formed on a line for connecting the transparent electrode patterns and a display driving circuit and a touch sensing unit for connecting the driving node and a touch sensing circuit;
• outputting an image by connecting the transparent electrode patterns and the display driving circuit in the display control period;
• sensing an illuminance by forming a predetermined voltage difference between at least one electrode patterns among the transparent electrode patterns and the lower electrode patterns in the illuminance sensing period;
• and
• sensing a touch by connecting the transparent electrode patterns and the touch sensing circuit through the touch sensing unit in the touch sensor control period,
• wherein in the illuminance sensing step, a voltage supplied to the lower electrode pattern is relatively higher than that of the transparent electrode pattern, and the illuminance is measured by measuring the magnitude of a current formed by the transparent electrode pattern and the lower electrode pattern.

A method of controlling a passive matrix organic light emitting diode display, the display including a plurality of lower electrode patterns arranged in parallel, a plurality of transparent electrode patterns arranged in parallel and being perpendicular to the lower electrode patterns, and an organic compound layer interposed between the lower electrode pattern and the transparent electrode pattern, to implement display output, illuminance sensing and touch sensing by time-sharing a control of the transparent electrode patterns and the lower electrode patterns into at least one of a display control period, an illuminance sensing period and a touch sensor control period for each display frame time, the method comprising steps of:

• providing a driving node, which is formed on a line for connecting the transparent electrode patterns and a display driving circuit and a touch sensing unit for connecting the driving node and a touch sensing circuit;
• outputting an image by connecting the transparent electrode patterns and the image driving circuit in the display control period;
• sensing an illuminance by forming a predetermined voltage difference between at least one electrode patterns of the transparent electrode patterns and the lower electrode patterns in the illuminance sensing period;
• and
• sensing a touch by connecting the transparent electrode patterns and the touch sensing circuit through the touch sensing unit in the touch sensor control period,
• wherein the display frame time is implemented in a combination of the display output and the illuminance sensing or a combination of the display output and the touch sensing to be formed in a regular pattern, and
• wherein a voltage supplied to the lower electrode pattern is relatively higher than that of the transparent electrode pattern in the illuminance sensing period, and the illuminance is measured by measuring the magnitude of a current formed by the transparent electrode pattern and the lower electrode pattern.