Modular LED messaging sign panel and display system

• US 5,990,802 A
• Filed: 05/18/1998
• Issued: 11/23/1999
• Est. Priority Date: 05/18/1998
• Status: Expired due to Fees

• Current Assignee: Smartlite Communications, Inc.
• Original Assignee: Smartlite Communications, Inc.
• Inventors: Maskeny, Donald David
• Primary Examiner(s): Lefkowitz, Edward
• Assistant Examiner(s): GOINS, DAVETTA WOODS
• Application Number:
  US09/080,687
• Time in Patent Office: 554 Days
• Field of Search: 340/815.45, 340/815.31, 340/815.42, 345/82, 345/156, 345/39, 345/46, 345/903, 345/83, 345/204, 345/205, 362/244
• US Class Current: 340/815.45
• CPC Class Codes: G09F 9/3026 Video wall, i.e. stackable semiconductor matrix display modules video wall control systems G06F3/1446, G09G2300/026
• 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 3/32 semiconductive, e.g. using light-emitting diodes [LED]
• CPC Class Codes: H05K 1/18 Printed circuits structurally associated with non-printed electric components H05K1/0201, H05K1/023, H05K1/0243, and H05K1/16 take precedence
• CPC Class Codes: Y10S 345/903 Modular display

Abstract

A modular messaging sign panel contains a plurality of LEDs coupled to a plurality of latched drivers. A microcontroller on the panel has a unique serial number permitting the panel to be selectively addressed by a host. The microcontroller receives serial data representing an image frame, selects the data intended for the panel in which it controls and clocks it out to the latched drivers along a single serial data line. Multiple panels can be connected to form a larger display panel system. Each panel has its own uniquely addressed microcontroller. A three wire connection couples the panel or display system to a computer and a power supply. A single jumper wire connects each modular panel together such that the data output from the computer is received by every microcontroller within the system in a parallel configuration. Accordingly, each microcontroller is receiving all the data outputted from the computer but only selects certain data for distribution to the latched drivers coupled to the LEDs on its particular panel based upon an ID match. Power and ground are supplied to a multi-panel system via power and ground rails of a frame structure upon which the panels are mounted.

Claims

1. A modular messaging sign panel capable of emitting light, the panel comprising:

a) an electrical circuit board;

b) a plurality of lights coupled to the circuit board;

c) a plurality of display chips coupled to the electrical circuit for driving the lights;

d) a three wire connection to the panel, a first wire connected between a host and the electrical circuit on the panel, and second and third wire connections between a power supply and the electrical circuit on the panel; and

e) uniquely addressable serial data selection and distribution means for receiving all serial data outputted from the host and distributing selected serial data to the display chips along a single serial data line if the selected serial data contains an address match for the panel, the uniquely addressable serial data selection and distribution means coupled to the electrical circuit.

2. The modular messaging sign panel of claim 1, wherein the plurality of lights are LEDs.

3. The modular messaging sign panel of claim 1, wherein the plurality of display chips are serial-in-parallel-out latched drivers.

4. The modular messaging sign panel of claim 3, wherein the plurality of latched drivers are coupled in series such that a first latched driver receives the serial data from the uniquely addressable serial data selection and distribution means at a serial data input and outputs the serial data to the next latched driver in series, the distribution of serial data terminating upon a condition in which each of the plurality of latched drivers on the panel receives 8-bits of serial data.

5. The modular messaging sign panel of claim 1, wherein the first wire of the three wire connection is made between the host and the panel by an asynchronous serial byte-orientated protocol coneciton and the second and third wire connections made between the power supply and the panel by a positive DC voltage and a common ground, respectively.

6. The modular messaging sign panel of claim 5, wherein the positive DC voltage is regulated upon the panel.

7. The modular messaging sign panel of claim 1, wherein the uniquely addressable serial data selection and distribution means is a microcontroller.

8. The modular messaging sign panel of claim 7, wherein the microcontroller contains a unique non-erasable serial number in memory permitting the microcontroller to distribute the selected serial data to the display chips for display on the panel by the lights.

9. The modular messaging sign panel of claim 7, wherein the selected serial data represents a single image frame which is distributed to registers in the display chips by the microcontroller while previously selected serial data previously distributed by the microcontroller representing a different single image frame is directed to a set of outputs of the display chips and displayed by the lights.

10. The modular messaging sign panel of claim 1, wherein a one color display is employed.

11. The modular messaging sign panel of claim 10, wherein two bytes of display data are distributed to the display chips for every one byte of serial data selected by the uniquely addressable serial data selection and distribution means.

12. The modular messaging sign panel of claim 1, wherein the uniquely addressable serial data selection and distribution means can receive and process a plurality of commands generated by the host, the plurality of commands comprising image load and non-load commands.

13. The modular messaging sign panel of claim 12, wherein a first non-load command sets the brightness value of the lights employed on the panel, the set brightness non-load command comprising of a six byte packet of data, a first portion containing a single byte command to notify the uniquely addressable serial data selection and distribution means that the incoming command is the set brightness command, a second portion containing a single byte length value corresponding to a light illumination value between 0 and 255, and a third portion containing a four byte serial number corresponding to a unique address of the panel, the light illumination value represented by an eight-bit binary number which is continuously rotated through an output enable pin on each of the plurality of display chips on the panel during an image display, the lights pulsating on and off in response to two opposed states contained within the binary number, the light illumination value of 1 being the dimmest setting and the light illumination value of 255 being the brightest setting.

14. A light emitting sign display system comprising:

a) at least two modular panels having electrical circuits traced thereupon;

b) a plurality of lights coupled to the electrical circuits of the modular panels;

c) a plurality of display chips coupled to the electrical circuits of the modular panels, the plurality of lights directly coupled to outputs of the display chips, the display chips capable of outputting data to the lights for the display of an image upon the sign display system;

d) a frame structure having voltage conducting rails and ground rails, the voltage conducting rails electrically coupled to a positive DC voltage of a power supply, the ground rails coupled to a common ground reference, the modular panels attached to the frame structure such that each modular panel is coupled to the DC voltage and the common ground reference; and

e) uniquely addressable serial data and panel selection and distribution means for receiving all serial data outputted from a host and distributing selected serial data to the display chips of a particular panel within the sign display system along a single serial data line if the selected serial data contains an address match for the particular panel, the uniquely addressable serial data and panel selection and distribution means coupled to each electrical circuit on each panel.

15. The light emitting sign display system of claim 14, wherein the plurality of lights are LEDs.

16. The light emitting sign display system of claim 14, wherein the plurality of display chips are serial-in-parallel-out latched drivers.

17. The light emitting sign display system of claim 16, wherein the latched drivers are capable of directing selected serial data to the lights directly coupled to the outputs of the latched drivers while simultaneously receiving and storing different selected serial data within registers of the latched drivers for future directing to the outputs.

18. The light emitting sign display system of claim 14, wherein each modular panel of the system has a power and ground bus, the power bus on each panel having a plate-through hole for receiving a screw and coupling each panel to the voltage conducting rail of the frame structure, the ground bus on each panel having at least one plate-through hole for receiving a screw and coupling each panel to the ground rail of the frame structure.

19. The light emitting sign display system of claim 18, wherein the positive DC voltage on each panel is regulated.

20. The light emitting sign display system of claim 14, wherein the uniquely addressable serial data and panel selection and distribution means is a plurality of microcontrollers, each microcontroller individually associated with one of the plurality of modular panels such that the number of microcontrollers employed is directly proportional to the number of modular panels employed within the system, the plurality of microcontrollers within the sign display system wired in parallel with respect to the serial data output from the host.

21. The light emitting sign display system of claim 20, wherein a single data jumper wire is coupled between each of the plurality of modular panels within the sign display system.

22. The light emitting sign display system of claim 20, wherein each of the plurality of microcontrollers contains a first unique non-erasable serial number in memory permitting each microcontroller to be individually addressed for distributing the selected serial data to the display chips for display by the lights.

23. The light emitting sign display system of claim 22, wherein a second and separate unique serial number is assignable to each microcontroller for use in directing selected serial data to a particular modular panel within a sign display system employing a maximum of 255 modular panels, the second and separate unique serial number assigned to each microcontroller by coupling a WIRED ID lead of a first microcontroller to a first output of a first display chip on a first modular panel, a WIRED ID lead of a second microcontroller to a second output of a first display chip on a second modular panel and a WIRED ID of a n microcontroller to an x output of a y display chip on an n modular panel, wherein n represents the total number of modular panels and microcontrollers, equal to 255 or less, employed within the display system, y represents a display chip on the n modular panel and is determined by dividing the total number of modular panels to be used by the number eight and rounding that number up to the next whole number if that number equals a value that exceeds a whole number, and x represents some number between 1 and 8 and is determined by multiplying a fractional portion of the number calculated in the chip determination by the number eight, and if the fractional number is zero, the eighth output is used.

24. The light emitting sign display system of claim 20, wherein the microcontrollers can receive and process a plurality of commands generated by the host, the plurality of commands comprising image load and non-load commands.

25. The light emitting sign display system of claim 24, wherein a first non-load command sets the brightness value of the lights employed on all of the modular panels, the set brightness non-load command comprising of a six byte packet of data, a first portion containing a single byte command to notify the plurality of microcontrollers that the incoming command is the set brightness command, a second portion containing a single byte length value corresponding to a light illumination value between 0 and 255, and a third portion containing a four byte serial number corresponding to a unique address of the panel, the light illumination value represented by an eight-bit binary number which is continuously rotated through an output enable pin on each of the plurality of display chips on the panel during an image display, the lights pulsating on and off in response to two opposed states contained within the binary number, the light illumination value of 1 being the dimmest setting and the light illumination value of 255 being the brightest setting.

26. The light emitting sign display system of claim 24, wherein a second non-load command assigns a unique logical position to each modular panel of the system with respect to a grid representing the sign display system, the second non-load command associating the unique logical position for each panel with the first unique non-erasable serial number for each microcontroller.

27. The light emitting sign display system of claim 14, wherein a one color display is employed.

28. The light emitting sign display system of claim 27, wherein two bytes of display data are distributed to the display chips for every one byte of serial data selected by the uniquely addressable serial data and panel selection and distribution means.

29. An LED sign display system comprising:

a) at least two modular panels having electrical circuits traced thereupon;

b) a plurality of LEDs coupled to the electrical circuits of the modular panels;

c) a plurality of latched drivers coupled to the electrical circuits of the modular panels, the plurality of LEDs directly coupled to outputs of the latched drivers, the latched drivers capable of outputting data to the LEDs for the display of an image upon the sign display system, the latched drivers on a single panel coupled in series along a single serial data line on each panel;

d) a frame structure having voltage conducting rails and ground rails, the voltage conducting rails electrically coupled to a positive DC voltage of a power supply, the ground rails coupled to a common ground reference, the modular panels attached to the frame structure such that each modular panel is coupled to the DC voltage and the common ground reference; and

e) a plurality of microcontrollers each having a unique non-erasable serial number, the microcontrollers for receiving all serial data outputted from a host and distributing selected serial data to the latched drivers of a particular panel within the sign display system along the single serial data line if the selected serial data contains an address match for the particular panel, each microcontroller coupled to the electrical circuit of each panel.