Optoelectronic device
AssigneesSTMicroelectronics (Grenoble 2) SAS, STMicroelectronics S.r.l.
InventorsJonathan STECKEL, Giovanni CONTI, Gaetano L'EPISCOPO, Mario Antonio ALEO
Life of this patent
Estimating the term…
Abstract
An optoelectronic device includes a backlight panel illuminating a display panel. The backlight panel includes an array of light emitting pixels, with each light emitting pixel including at least one subpixel formed by one or more light emitting diodes positioned on a substrate. At least one photodetector is positioned on the substrate and arranged to detect an amount of reflected light emitted by said subpixel and reflected by the display panel.
Claims30
An optoelectronic device, comprising:
- a backlight panel illuminating a display panel, the backlight panel comprising an array of light emitting pixels;
- wherein each light emitting pixel comprises:
- at least one subpixel comprising one or more light emitting diodes positioned on a substrate;
- at least one photodetector positioned on the substrate and arranged to detect an amount of reflected light emitted by said subpixel and reflected by the display panel;
- and
- a control circuit coupled to said at least one subpixel and the at least one photodetector, said control circuit configured to control a level of light emission by said at least one subpixel as a function of the amount of reflected light detected by the at least one photodetector;
- said control circuit further configured to activate the one or more light emitting diodes by applying a first driving signal based on a first offset value corresponding to a first calibration point associated with said at least one subpixel and derived from said amount of reflected light detected by the at least one photodetector, wherein said first calibration point is stored in memory circuit of the control circuit.
A calibration method of a backlight panel of an optoelectronic device, comprising:
- activating, by a control circuit of the backlight panel through application of a first driving signal, one or more light emitting diodes of a subpixel of a light emitting pixel of the backlight panel, each light emitting pixel comprising at least one of said subpixels, the backlight panel comprising an array of light emitting pixels for illuminating a display panel of the optoelectronic device;
- detecting, by a photodetector of the light emitting pixel, an amount of reflected light emitted by said subpixel and reflected by the display panel, said at least one subpixel and the corresponding photodetector being coupled to the control circuit;
- generating by the control circuit one or more first offset values based on the detected amount of reflected light, said one or more first offset values indicating an offset level to be applied to the driving signal;
- and
- storing said one or more first offset values in a memory of the control circuit.
A method of controlling a backlight panel of an optoelectronic device, comprising:
- activating, by a control circuit of the backlight panel, one or more light emitting diodes of a subpixel of a first light emitting pixel of the backlight panel by applying a first driving signal, each first light emitting pixel comprising at least one of said subpixels and at least one photodetector for detecting an amount of reflected light emitted by said subpixel, the backlight panel comprising an array of light emitting pixels for illuminating a display panel of the optoelectronic device;
- wherein activating comprises generating, by the control circuit, the first driving signal based on a first offset value corresponding to a first calibration point associated with said subpixel;
- wherein said first offset value is stored in a memory of the control circuit.
Dependencies are inferred from the claim text.