Method and device for monitoring luminous intensity of display pixel

A method for monitoring luminous intensity of display pixel, wherein the method is used in a device for monitoring luminous intensity of display pixel, the device comprises a self-luminous LED display, an optical glue, a photo-detecting array film and a processing chip, the optical glue attached to a lower surface of the self-luminous LED display, the photo-detecting array film disposed under the optical glue, the self-luminous LED display comprises a plurality of display pixels, each display pixel comprises a luminescent layer, a cover glass disposed above the display pixel, the refractive index of the optical glue is smaller than the refractive index of the cover glass, and the method comprises:

• emitting an optical signal, by the luminescent layer of the display pixel, after receiving a display driving signal transmitted from the processing chip, a part of the optical signal whose incident angle is greater than a second critical angle is reflected on the upper surface of the cover glass and formed as a reflected optical signal, and the second critical angle is a critical angle at which the optical signal is totally reflected on the upper surface of the cover glass;
• filtering, by the optical glue, a part of the reflected optical signal whose incident angle toward the optical glue is greater than a first critical angle, so that the other part of the reflected optical signal not filtered is formed as a first reflected optical signal, and the first critical angle is the critical angle at which the reflected optical signal totally reflected on the surface of the optical glue;
• and
• detecting the first reflected optical signal by the photo-detecting array film;
• and
• calculating a luminous intensity of the display pixel according to the first reflected optical signal and transmitting a feedback signal by the processing chip when it is determined that the luminous intensity of the display pixel is not changed in the preset period.