Frequency compensation for a display
Techniques and apparatuses are described that perform frequency compensation for a display. In aspects, a first uniformity of multiple regions of the display can be measured at a reference frequency. The display can then be driven at a second frequency and a second uniformity of the multiple regions of the display can be measured. The differences between the first and second uniformity can then be used to generate a compensation mask. XYZ domain data from the first and second uniformity measurements can be used to generate a color model characterization. The color model characterization can be used to convert the XYZ domain data into RGB data when the display is driven at the second frequency to compensate for the differences in uniformity across the multiple regions of the display.
1. A method comprising:
driving a display at a first frequency with a control signal via a device controller, the first frequency being a reference frequency;
measuring a first uniformity, at the first frequency, of multiple regions of the display in an XYZ domain at the reference frequency;
driving the display at a second frequency with the control signal via the device controller;
measuring a second uniformity, at the second frequency, of the multiple regions of the display in the XYZ domain;
generating a compensation mask to compensate for a difference between the second uniformity and the first uniformity;
generating a color model characterization based on the difference between the second uniformity and the first uniformity to generate a conversion formula;
converting data associated with the XYZ domain to Red Green Blue (RGB) data using the conversion formula; and
applying the RGB data and the compensation mask to the display with the display being driven at the second frequency to compensate for the difference between the first uniformity and the second uniformity.
2. The method of claim 1 , wherein the multiple regions of the display do not have a difference in uniformity when driven at the first frequency, and
wherein a first region of the multiple regions of the display has a 3-10% difference in uniformity compared to a second region of the multiple regions when the display is driven at the second frequency.
3. The method of claim 1 , wherein the first frequency is a high speed frequency, the display is manufactured to provide uniformity across the multiple regions of the display, and the second frequency is a normal or low speed frequency.
4. The method of claim 1 , wherein the first frequency is 120 hertz (Hz) and the second frequency is 60 Hz or 90 Hz.
5. The method of claim 1 , further comprising:
driving the display at a third frequency; and
measuring a third uniformity, at the third frequency, of the multiple regions of the display in the XYZ domain, wherein the compensation mask compensates for differences between the third uniformity and the first uniformity.
6. The method of claim 1 , wherein the measuring of the first uniformity and the second uniformity is accomplished via a two dimensional camera associated with the device controller.
7. The method of claim 1 , wherein the display is employed as a part of a smartphone and is driven at the first frequency for a period of time and at the second frequency for a different period of time.
8. The method of claim 1 , wherein the RGB data and the compensation mask are applied to multiple displays being driven at the second frequency.