Systems and methods of multiple color driving

• US 10,102,808 B2
• Filed: 10/14/2016
• Issued: 10/16/2018
• Est. Priority Date: 10/14/2015
• Status: Active Grant

• Current Assignee: IGNIS Innovation Incorporated
• Original Assignee: IGNIS Innovation Incorporated
• Inventors: Chaji, Gholamreza
• Primary Examiner(s): Chang, Kent
• Assistant Examiner(s): MORALES FERNANDEZ, BENJAMIN
• Application Number:
  US15/293,526
• Publication Number:
  US 20170110061A1
• Time in Patent Office: 732 Days
• Field of Search: None
• CPC Class Codes: G09G 2300/0443 with several sub-pixels for the same colour in a pixel, not specifically used to display gradations G09G3/364 takes precedence
• CPC Class Codes: G09G 2300/0452 Details of colour pixel setup, e.g. pixel composed of a red, a blue and two green components
• CPC Class Codes: G09G 2310/027 Details of drivers for data electrodes, the drivers handling digital grey scale data, e.g. use of D/A converters
• CPC Class Codes: G09G 2310/0286 Details of a shift registers arranged for use in a driving circuit
• CPC Class Codes: G09G 2310/0291 Details of output amplifiers or buffers arranged for use in a driving circuit
• CPC Class Codes: G09G 2310/08 Details of timing specific for flat panels, other than clock recovery
• CPC Class Codes: G09G 2330/021 Power management, e.g. power saving
• CPC Class Codes: G09G 3/2003 Display of colours specific for liquid crystal displays G09G3/3607
• CPC Class Codes: G09G 3/3291 in which the data driver supplies a variable data voltage for setting the current through, or the voltage across, the light-emitting elements

Abstract

Systems and methods of color data driving for light emissive visual display technology, and particularly to systems and methods for driving pixels with more than three primary color subpixels. Only a subset of the total number of subpixels per pixel are driven at any one time reducing the number of decoders/DACs. The decoders/DACs are coupled by a color decoder only to the active subpixels using a switching fabric.

Claims

1. A color data driver for an emissive display system having pixels, each pixel having a number of primary color subpixels, each primary color subpixel having a light emitting device, the color data driver comprising:

data storage for receiving color data for a number of active primary color subpixels of a pixel, the number of active primary color subpixels less than a number of primary color subpixels of the pixel;

decoders for performing digital to analog conversion of the color data to generate analog color data, the number of decoders corresponding to a preset maximum number of active primary color subpixels of a pixel which is less than the number of primary color subpixels of the pixel; and

a color decoder for receiving the analog color data for the number of active primary color subpixels and for providing the color data for the active primary color subpixels to the pixel, the color decoder comprising;

a switch fabric controllable to select a switching state being a combination of switching from color data inputs of the color decoder to color data outputs of the color decoder with use of color bits provided to the color decoder, the switch fabric for, according to the switching state, switching to each color data output one of at least one color data input, and for switching to at least one color data output, one of at least two color data inputs.

2. The color data driver of claim 1, wherein the switch fabric comprises a set of switches for connecting to at least one bias voltage, color data outputs which are not being used for providing to the pixel the color data for the active primary color subpixels.

3. The color data driver of claim 2 wherein the at least one bias voltage comprises a different bias voltage for each color data output.

4. The color data driver of claim 1, wherein the color bits uniquely identifies the switching state from a number of preset possible states, the bit length of the color bits corresponding to a shortest bit length required to select any of the switching states from the number of preset possible states.

5. The color data driver of claim 4 wherein the number of present possible states is two and the bit length of the color bits is one.

6. The color data driver of claim 1 wherein the number of active primary color subpixels is three, the preset maximum number of active primary color subpixels of a pixel is three, and the number of primary color subpixels of the pixel is four.

7. The color data driver of claim 6 wherein the primary color subpixels of the pixel consist of a red subpixel, a green subpixel, a blue subpixel, and a white subpixel.

8. The color data driver of claim 7, wherein the color bits uniquely identifies the switching state from four preset possible states and the bit length of the color bits is two, and wherein the switch fabric comprises a set of switches for connecting to at least one bias voltage, color data outputs which are not being used for providing to the pixel the color data for the active primary color subpixels.

9. The color data driver of claim 1, wherein the color decoder receives the analog color data from the decoders via buffers, the number of buffers corresponding to the number of decoders.

10. The color data driver of claim 1, wherein the data storage comprises a switch register for storing the color data and the color bits, and for providing the color bits to the color decoder.

11. A method of data driving for an emissive display system having pixels, each pixel having a number of primary color subpixels, each primary color subpixel having a light emitting device, the method comprising:

receiving color data for a number of active primary color subpixels of a pixel, the number of active primary color subpixels less than a number of primary color subpixels of the pixel;

performing digital to analog conversion of the color data to generate analog color data using decoders, the number of decoders corresponding to a preset maximum number of active primary color subpixels of a pixel which is less than the number of primary color subpixels of the pixel;

receiving by a color decoder the analog color data for the number of active primary color subpixels; and

providing by the color decoder the color data for the active primary color subpixels to the pixel with use of a switch fabric, the providing comprising;

selecting a switching state being a combination of switching from color data inputs of the color decoder to color data outputs of the color decoder with use of color bits provided to the color decoder;

according to the switching state, switching to each color data output one of at least one color data input; and

according to the switching state, switching to at least one color data output, one of at least two color data inputs.

12. The method of claim 11, wherein the step of providing further comprises:

according to the switching state, connecting to at least one bias voltage, color data outputs which are not being used for providing to the pixel the color data for the active primary color subpixels.

13. The method of claim 12 wherein the at least one bias voltage comprises a different bias voltage for each color data output.

14. The method of claim 11, wherein the color bits uniquely identifies the switching state from a number of preset possible states, the bit length of the color bits corresponding to a shortest bit length required to select any of the switching states from the number of preset possible states.

15. The method of claim 14 wherein the number of present possible states is two and the bit length of the color bits is one.

16. The method of claim 11 wherein the number of active primary color subpixels is three, the preset maximum number of active primary color subpixels of a pixel is three, and the number of primary color subpixels of the pixel is four.

17. The method of claim 16 wherein the primary color subpixels of the pixel consist of a red subpixel, a green subpixel, a blue subpixel, and a white subpixel.

18. The method of claim 17, wherein the color bits uniquely identifies the switching state from four preset possible states and the bit length of the color bits is two, and wherein the step of providing further comprises:

connecting to at least one bias voltage, color data outputs which are not being used for providing to the pixel the color data for the active primary color subpixels.

19. The method of claim 11, wherein the receiving by the color decoder of the analog color data from the decoders is via buffers, the method further comprising:

receiving by buffers the analog color data from the decoders, the number of buffers corresponding to the number of decoders.

20. The method of claim 11, further comprising:

storing the color data and the color bits in a switch register; and

providing the color bits from the switch register to the color decoder.