Light Emitting Diode (LED) backlight control for reproduction of High Dynamic Range (HDR) content using Standard Dynamic Range (SDR) Liquid Crystal Display (LCD) panels
Systems and methods for Light Emitting Diode (LED) backlight control for reproduction of High Dynamic Range (HDR) content using Standard Dynamic Range (SDR) Liquid Crystal Display (LCD) panels. In an illustrative, non-limiting embodiment, an LCD display may include: an SDR-LCD panel and a controller coupled to the SDR-LCD panel, the controller configured to: identify video that includes HDR content using a luminance histogram, and to display the HDR content by increasing a luminance of a Light-Emitting Diode (LED) backlight disposed within the LCD display.
1. A display, comprising:
a Standard Dynamic Range (SDR)-Liquid Crystal Display (LCD) panel comprising a Light-Emitting Diode (LED) backlight; and
a controller coupled to the SDR-LCD panel, the controller configured to:
identify video that includes High Dynamic Range (HDR) content using a luminance histogram; and
display the HDR content by increasing a luminance of the LED, wherein the video includes a first portion having luminance content below a threshold and a second portion having luminance content above the threshold, and wherein displaying the HDR content further comprises:
(a) boosting a luminance of the LED backlight to a first value while the first portion is being displayed; and
(b) boosting the luminance of the LED backlight to a second value greater than the first value, for a duration shorter than the displaying of the second portion.
2. The display of claim 1 , wherein boosting the luminance includes applying, to the LED backlight, an amount of electrical current above a normal operating range, wherein the amount of electrical current decreases a lifespan of the LED backlight faster than any other amount of electrical current within the normal operating range.
3. The display of claim 2 , wherein boosting the luminance includes increasing the luminance by a discrete increment.
4. The display of claim 3 , wherein the first portion does not include any HDR content and the second portion includes the HDR content, and wherein the discrete increment is calculated to prevent flashing or blinking of the SDR-LCD panel between the displaying of the first portion and the displaying of the second portion.
5. The display of claim 3 , wherein the discrete increment produces a luminance value derived as: (a) a luminance value of a current frame multiplied by a weighted coefficient; plus (b) one minus the weighted coefficient, multiplied by a luminance value of a previous frame.
6. The display of claim 5 , wherein the weighted coefficient is a combination of: a temperature-based coefficient, a scene-based coefficient, and a time-based coefficient.
7. The display of claim 1 , wherein the controller is further configured to:
determine that a thermal overrun event has occurred; and
decrease the luminance of the LED backlight by another discrete increment using a temperature-based coefficient while the video continues to include the HDR content.
8. The display of claim 1 , wherein the controller is further configured to:
determine that an overdrive timeout event has occurred; and
decrease the luminance of the LED backlight by another discrete increment using a time-based coefficient.
9. The display of claim 1 , wherein the controller is further configured to:
determine that a thermal overrun event has not occurred;
determine that an overdrive timeout event has not occurred; and
increase the luminance of the LED backlight by another discrete increment based on a scene-based coefficient.
10. A hardware memory device having program instructions stored thereon that, upon execution by a controller, cause the controller to:
identify video that includes High Dynamic Range (HDR) content; and
display the HDR content, at least in part, by increasing an electrical current applied to an LED backlight of a Standard Dynamic Range (SDR), Liquid Crystal Display (LCD) panel, wherein the video includes a first portion and a second portion, wherein the first portion does not include any HDR content and the second portion includes the HDR content, and wherein the increase prevents flashing or blinking of the LED backlight between the displaying of the first portion and the displaying of the second portion by the SDR-LCD panel.
11. The hardware memory device of claim 10 , wherein increasing the electrical current includes increasing a luminance by a discrete increment.
12. The hardware memory device of claim 11 , wherein the discrete increment results in a luminance value derived as: (a) a luminance value of a current frame multiplied by a weighted coefficient; plus (b) one minus the weighted coefficient, multiplied by a luminance value of a previous frame.
13. The hardware memory device of claim 11 , wherein the program instructions are further configured to cause the controller to:
determine that a thermal overrun or overdrive timeout event has occurred; and
decrease the luminance by another discrete increment using a temperature-based or time-based coefficient while the video continues to include the HDR content.
14. The hardware memory device of claim 13 , wherein the program instructions are further configured to cause the controller to:
determine that neither a thermal overrun nor an overdrive timeout event has occurred; and
increase the luminance by another discrete increment based on a scene-based coefficient.
15. A method, comprising:
identifying, via a controller, video that includes High Dynamic Range (HDR) content;
displaying the HDR content, at least in part, by increasing a brightness of an LED backlight of a Standard Dynamic Range (SDR), Liquid Crystal Display (LCD) panel; and
at least one of:
(i) determining that a thermal overrun or overdrive timeout event has occurred and decreasing the brightness by another discrete increment using a temperature-based or time-based coefficient while the video continues to include the HDR content or
(ii) determining that neither the thermal overrun nor the overdrive timeout event has occurred and increasing the brightness by another discrete increment based on a scene-based coefficient.
16. The method of claim 15 , wherein increasing the brightness includes increasing a luminance by a discrete increment.
17. The method of claim 16 , wherein the discrete increment results in a luminance value derived as: (a) a luminance value of a current frame multiplied by a weighted coefficient; plus (b) one minus the weighted coefficient, multiplied by a luminance value of a preceding frame.
18. A method, comprising:
identifying, via a controller, video that includes High Dynamic Range (HDR) content; and
displaying the HDR content, at least in part, by increasing a brightness of an LED backlight of a Standard Dynamic Range (SDR), Liquid Crystal Display (LCD) panel by an increment, wherein increment results in a luminance given by: (a) a luminance value of a current frame multiplied by a weighted coefficient; plus (b) one minus the weighted coefficient, multiplied by a luminance value of a preceding frame.