Selective dimming to reduce power of a light emitting display device
View Patent ↗Selective dimming in a light emitting display device to reduce power consumption. The display device includes a display panel that includes a plurality of light emitting pixels. An image processor is configured to divide an image frame into a plurality of regions and to reduce pixel intensity levels in at least one region of the plurality of regions to generate an adjusted image frame. The at least one region corresponds to a background of the image frame. A display driver converts data for the adjusted image frame into control signals for controlling brightness of the light emitting pixels. The display device may be, for example, an organic light emitting diode (OLED) display device or other type of display device that includes light emitting pixels.
1. A display device with selective dimming, comprising:
a display panel including a plurality of light emitting pixels that emit light;
an image processor to divide an image frame into a plurality of regions and to generate an adjusted image frame by determining a maximum intensity difference between a lowest pixel intensity level and a highest pixel intensity level in a region of the plurality of regions and reducing pixel intensity levels in the region responsive to the maximum intensity difference in the region being less than a threshold difference in intensity; and
a display driver to convert data for the adjusted image frame into control signals for controlling brightness of the light emitting pixels.
2. The display device of claim 1 , wherein the image processor reduces the pixel intensity levels in the region by a current amount of intensity reduction that is determined based on a previous amount of intensity reduction of the region in a previous image frame.
3. The display device of claim 2 , wherein the current amount of intensity reduction is higher than the previous amount of intensity reduction.
4. The display device of claim 1 , wherein the image processor further determines an indication of differences in pixel intensity levels in the image frame relative to previous image frames and reduces the pixel intensity levels in the region responsive to the differences indicating a lack of change.
5. The display device of claim 1 , wherein the light emitting pixels of the display panel are organic light emitting diode (OLED) pixels.
6. A method of operation in a display device that includes a display panel having a plurality of light emitting pixels, the method comprising:
dividing an image frame into a plurality of regions;
generating an adjusted image frame by determining a maximum intensity difference between a lowest pixel intensity level and a highest pixel intensity level in a region of the plurality of regions and reducing pixel intensity levels in the region responsive to the maximum intensity difference in the region being less than a threshold difference in intensity.
7. The method of claim 6 , wherein reducing the pixel intensity levels comprises:
reducing the pixel intensity levels in the region by a current amount of intensity reduction that is determined based on a previous amount of intensity reduction of the region in a previous image frame.
8. The method of claim 7 , wherein the current amount of intensity reduction is higher than the previous amount of intensity reduction.
9. The method of claim 6 , wherein generating the adjusted image frame further comprises determining an indication of differences in pixel intensity levels in the image frame relative to previous image frames and reducing the pixel intensity levels in the region responsive to the differences indicating a lack of change.
10. The method of claim 6 , wherein the light emitting pixels of the display panel are organic light emitting diode (OLED) pixels.