Display device and blood pressure measurement method using the same

A blood pressure measurement method using a display device, comprising:

• calculating a first feature point corresponding to a first lowest point, a second feature point corresponding to a highest point, and a third feature point corresponding to a second lowest point next to the first feature point in each of cycles of a first pulse wave signal based on the first pulse wave signal sensed by a photo-sensor;
• generating a peak detection signal based on an amplitude of the second feature point in each of the cycles of the first pulse wave signal and a pressure signal sensed by a pressure sensor in a first mode;
• calculating blood pressure information based on the peak detection signal;
• generating first biometric information by calculating a first ratio between a first section from the first feature point to the second feature point and a second section from the second feature point to the third feature point in each of the cycles of the first pulse wave signal in a second mode;
• deciding whether or not the first biometric information coincides with second biometric information stored in advance;
• and
• displaying the blood pressure information on a display panel in the first mode and displaying a decision result for whether or not the first biometric information coincides with the second biometric information on the display panel in the second mode.

A display device comprising:

• a plurality of pixels emitting light;
• a pressure sensor sensing a pressure applied from outside;
• a first photo-sensor disposed in the display device to face upward and sensing light;
• a second photo-sensor disposed in the display device to face downward and sensing light;
• and
• a main processor receiving a pressure signal sensed by the pressure sensor, a pulse wave signal sensed by the first photo-sensor to measure a blood pressure in a first mode, and an electrocardiogram signal sensed by the second photo-sensor,
• wherein the main processor
• calculates first to third feature points in each of cycles of the electrocardiogram signal, the first feature point positioned at a first peak point at a beginning of one cycle, a third feature point positioned at a second peak point at an end of the one cycle, and a second feature point positioned between the first feature point and the second feature point and at a highest point within the one cycle,
• calculates a fourth ratio between a first section from the first feature point to the second feature point and a second section from the second feature point to the third feature point in a second mode,
• calculates a plurality of fourth ratios and generates third biometric information including an average and a standard deviation of the fourth ratios of each of the cycles of the electrocardiogram signal,
• decides whether or not the third biometric information and fourth biometric information stored in advance in a memory are the same as each other,
• performs biometric authentication of a user when the third biometric information and the fourth biometric information are the same as each other, and
• stores the third biometric information in the memory.