Flexible pixel hardware and method

• US 8,552,929 B2
• Filed: 01/02/2013
• Issued: 10/08/2013
• Est. Priority Date: 10/14/2004
• Status: Active Grant

• Current Assignee: Daktronics Incorporated
• Original Assignee: Daktronics Incorporated
• Inventors: Mittan, Thomas R., Gloege, Chad Neal, Wendler, Brett David
• Primary Examiner(s): Amini, Javid A
• Application Number:
  US13/732,510
• Publication Number:
  US 20130120395A1
• Time in Patent Office: 279 Days
• Field of Search: 345/33, 345/46, 345/36, 345/44, 345/441
• US Class Current: 345/33
• CPC Class Codes: G06T 11/00 2D [Two Dimensional] image generation
• CPC Class Codes: G09F 13/0404 the light source being enclosed in a box forming the character of the sign
• CPC Class Codes: G09F 13/22 electroluminescent electroluminescent light sources per se H05B33/00
• CPC Class Codes: G09F 9/301 flexible foldable or roll-able electronic displays, e.g. thin LCD, OLED
• CPC Class Codes: G09F 9/33 being semiconductor devices, e.g. diodes
• CPC Class Codes: G09G 2300/026 Video wall, i.e. juxtaposition of a plurality of screens to create a display screen of bigger dimensions
• CPC Class Codes: G09G 3/06 using controlled light sources
• CPC Class Codes: G09G 3/12 using electroluminescent elements
• CPC Class Codes: G09G 3/14 Semiconductor devices, e.g. diodes
• CPC Class Codes: G09G 3/20 for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
• CPC Class Codes: G09G 3/2085 Special arrangements for addressing the individual elements of the matrix, other than by driving respective rows and columns in combination
• CPC Class Codes: H05K 13/00 Apparatus or processes specially adapted for manufacturing or adjusting assemblages of electric components
• CPC Class Codes: Y10T 29/49002 Electrical device making

Abstract

A graphical display station of arbitrary shape such as channel letters or other shaped structures is populated with pixels which are components of flexible pixel strings which can be arranged to fit the arbitrary shape(s). The flexible pixel strings provide for straightforward and cost effective fabrication of channel letter or other shaped displays. The invention also includes pixel units which comprise lighting elements together with such control circuits as are needed to roperly drive the lighting elements to form a graphical image. Addressing of the particular pixels is provided to accommodate the arbitrary arrangement of pixels of the flexible pixel strings. Methods of fabricating a channel letter display are also disclosed.

Claims

1. A graphical display assembly, comprising:

a plurality of flexible pixel strings, each flexible pixel string including;

a plurality of pixel units each including an array of lighting elements, each lighting element assigned an individual address corresponding to a flexible pixel string and a pixel unit, on which the lighting element is located, and a position of the lighting element on the pixel unit; and

one or more flexible connections connecting the plurality of pixel units, the one or more flexible connections including a data connection configured to pass graphical image data to and from one or more of the pixel units;

a software module configured to map the graphical image data onto the individually addressed lighting elements in order to create a desired graphical image; and

a display controller operable to pass the graphical image data through the flexible pixel strings via the one or more flexible connections such that the lighting elements in the pixel units receive individually addressed graphical image data.

2. The graphical display assembly of claim 1, wherein the plurality of flexible pixel strings is arranged so that the plurality of pixel units defines an arbitrary shaped display.

3. The graphical display assembly of claim 2, wherein the arbitrary shaped display is configured to present multicolor, moving images.

4. The graphical display assembly of claim 2, wherein the arbitrary shaped display is non-rectangular.

5. The graphical display assembly of claim 1, wherein a first one of the flexible pixel strings includes a number of pixel units that is different than a number of pixel units included in a second one of the flexible pixel strings.

6. The graphical display assembly of claim 1, wherein the lighting elements of each pixel unit comprise at least one red LED, at least one green LED, and at least one blue LED.

7. The graphical display assembly of claim 1, wherein each pixel unit includes at least one control circuit.

8. The graphical display assembly of claim 1, wherein each pixel unit includes at least one control circuit electrically connected to the lighting elements of the pixel unit.

9. The graphical display assembly of claim 8, wherein each lighting element is electrically connected to a separate one of a plurality of drive circuits, wherein the plurality of drive circuits are electrically connected to the at least one control circuit.

10. The graphical display assembly of claim 1, wherein the pixel units of each flexible pixel string are serially connected.

11. The graphical display assembly of claim 1, wherein at least one of the flexible pixel strings includes pixel units that are connected in series and in parallel.

12. The graphical display assembly of claim 1, wherein at least one of the flexible pixel strings includes pixel units arranged in a grid pattern.

13. A method of fabricating a graphical display, the method comprising:

providing or receiving a plurality of pixel units each including an array of lighting elements;

connecting the plurality of pixel units with one or more flexible connections to form one or more flexible pixel strings;

providing or receiving a software module for mapping graphical image data onto individually addressed lighting elements, each address associated with a flexible pixel string and a pixel unit on which each lighting element is located and a position of the lighting element on the pixel unit, in order to create a desired graphical image; and

providing or receiving a display controller for passing the graphical image data through the one or more flexible pixel strings via the one or more flexible connections such that the lighting elements in the flexible pixel strings receive individually addressed graphical image data.

14. The method of claim 13, further comprising positioning the pixel units of at least one flexible pixel string into a non-grid-like pattern to define an arbitrary shaped display.

15. The method of claim 13, wherein connecting the plurality of pixel units comprises serially connecting the pixel units in each of the one or more flexible pixel strings.

16. The method of claim 13, wherein connecting the plurality of pixel units includes establishing a data connection configured to pass the graphical image data to and from one or more of the pixel units.

17. The method of claim 13, wherein providing or receiving the plurality of pixel units includes providing or receiving a plurality of pixel units, each pixel unit including at least one control circuit and a plurality of drive circuits.

18. A method of operating a display, the method comprising:

individually addressing a location of each lighting element of a plurality of lighting elements included in each of a plurality of pixel units of one or more flexible pixel strings, including associating each address with a flexible pixel string and a pixel unit, on which each lighting element is located, and a position of the lighting element on the pixel unit;

mapping graphical image data onto the individually addressed lighting elements; and

transmitting the graphical image data through the one or more flexible pixel strings to each of the individually addressed lighting elements such that the lighting elements in the flexible pixel strings receive individually addressed graphical image data to create a desired graphical image.

19. The method of claim 18, wherein transmitting the graphical image data through the one or more flexible pixel strings includes transmitting the graphical image data through one or more flexible connections connecting the pixel units of each flexible pixel string.

20. The method of claim 19, wherein transmitting the graphical image data comprises transmitting the graphical image data, via the one or more flexible connections, to at least one control circuit of each pixel unit and transmitting the graphical image data to a drive circuit coupled to the at least one control circuit.