Temperature-to-color converter and conversion method

• US 6,956,337 B2
• Filed: 08/01/2003
• Issued: 10/18/2005
• Est. Priority Date: 08/01/2003
• Status: Expired due to Term

• Current Assignee: Directed, LLC (VOXX International Corporation)
• Original Assignee: DEI Holdings Incorporated
• Inventors: Kemper, Jonathan T.
• Primary Examiner(s): Wong, Don
• Assistant Examiner(s): A, MINH D
• Application Number:
  US10/633,472
• Publication Number:
  US 20050023991A1
• Time in Patent Office: 809 Days
• Field of Search: 315/117, 315/118, 315/136, 315/307, 315/309, 362/800, 362/85, 361/139, 361/140
• US Class Current: 315/307
• CPC Class Codes: G01K 1/02 Means for indicating or recording specially adapted for thermometers
• CPC Class Codes: G01K 1/06 Arrangements for facilitating reading, e.g. illumination, magnifying glass
• CPC Class Codes: Y10S 362/80 Light emitting diode

Abstract

A color-to-temperature converter senses temperatures of a device, translates the temperatures into light of different colors, and emits or displays the light. The color-to-temperature converter includes a tri-color light emitting diode (LED) assembly with inputs corresponding to red, green, and blue monochromatic LEDs within the assembly. The processor of the converter separately controls the intensity of each monochromatic LED of the assembly, and the outputs of the monochromatic LEDs converge to appear as one color to an observer. In typical operation, the relationship between the temperature input and the converged color imparts to the observer an intuitive understanding of the consequences of the sensed temperatures to operation of the device whose temperatures the converter monitors.

Claims

1. An instrument for displaying temperature as color, the instrument comprising:

a plurality of color sources, each color source being capable of engendering color of a different wavelength and variable apparent intensity, said each color source comprising an input capable of receiving a signal controlling color intensity of said each color source;

an electronic device comprising;

an input that receives temperature readings indicative of the temperature to be displayed,

circuitry that determines a plurality of color intensity values for each temperature reading, one color intensity value per said each color source, and generates a plurality of color intensity signals to control intensities of the plurality of color sources, one color intensity signal per said each color source, the color intensity signal of said each color source being controlled by the color intensity value of said each color source, and

a plurality of outputs coupling the color intensity signals to the inputs of the color sources, the color intensity signal of said each color source being coupled to the input of said each color source; and

a combiner of the colors engendered by the plurality of color sources;

wherein;

the circuitry of the electronic device comprises a memory and a digital processor executing program code stored in the memory; and

the temperature readings comprise digitized indications of temperature, the instrument further comprising an analog-to-digital converter that receives analog indications of temperature, and digitizes the analog indications of temperature to convert the analog indications of temperature into the digitized indications of temperature.

2. The instrument according to claim 1, further comprising a temperature sensor causing the analog indications of temperature to vary with temperature of the temperature sensor.

3. The instrument according to claim 2, wherein the circuitry of the electronic device causes the color intensity signal of said each color source to be a pulse-width modulated signal with duty cycle dependent on the color intensity value of said each color source.

4. The instrument according to claim 3, wherein the temperature sensor comprises a temperature-dependent current source.

5. The instrument according to claim 4, wherein the temperature-dependent current source provides current substantially proportional to temperature of the current source.

6. The instrument according to claim 3, wherein the temperature sensor comprises a thermistor.

7. The instrument according to claim 3, wherein the temperature sensor comprises a resistance temperature device.

8. The instrument according to claim 3, wherein the temperature sensor comprises a thermocouple.

9. The instrument according to claim 3, wherein the temperature sensor comprises a diode.

10. The instrument according to claim 3, wherein frequency of the pulse-width modulated signal is between about 25 Hz and 50 KHz.

11. The instrument according to claim 3, wherein the plurality of color sources comprises a plurality of substantially monochromatic color sources.

12. The instrument according to claim 11, wherein the plurality of color sources comprises a red color source, a green color source, and a blue color source.

13. The instrument according to claim 2, wherein the temperature sensor is remote from the plurality of the color sources.

14. The instrument according to claim 2, wherein the circuitry of the electronic device causes amplitude of the color intensity signal of said each color source to depend on the color intensity value of said each color source.

15. The instrument of claim 1, further comprising a serial connection between the analog-to-digital converter and the input of the electronic device for transmitting the digitized indications of temperature from the analog-to-digital converter to the input of the electronic device.

16. The instrument of claim 1, further comprising a parallel bus connection between the analog-to-digital converter and the input of the electronic device for transmitting the digitized indications of temperature from the analog-to-digital converter to the input of the electronic device.

17. The instrument of claim 1, further comprising a wireless connection between the analog-to-digital converter and the input of the electronic device for transmitting the digitized indications of temperature from the analog-to-digital converter to the input of the electronic device.

18. An instrument for displaying temperature as color, the instrument comprising:

a plurality of color sources, each color source being capable of engendering color of a different wavelength and variable apparent intensity, said each color source comprising an input capable of receiving a signal controlling color intensity of said each color source;

an electronic device comprising;

an input that receives temperature readings indicative of the temperature to be displayed,

circuitry that determines a plurality of color intensity values for each temperature reading, one color intensity value per said each color source, and generates a plurality of color intensity signals to control intensities of the plurality of color sources, one color intensity signal per said each color source, the color intensity signal of said each color source being controlled by the color intensity value of said each color source, and

a plurality of outputs coupling the color intensity signals to the inputs of the color sources, the color intensity signal of said each color source being coupled to the input of said each color source;

a combiner of the colors engendered by the plurality of color sources; and

a plurality of buffer circuits coupling the outputs of the electronic device to the inputs of the color sources, a buffer circuit per said each color source, the buffer circuit of said each color source being interposed between the input of said each color source and the output of the electronic device corresponding to said each color source.

19. The instrument according to claim 18, further comprising an analog-to-digital converter that receives analog indications of temperature, and digitizes the analog indications of temperature to convert the analog indications of temperature into the temperature readings.

20. The instrument according to claim 19, wherein the electronic device further comprises a memory and a digital processor executing program code stored in the memory.

21. The instrument according to claim 18, further comprising a temperature sensor causing the temperature readings to vary with temperature.

22. The instrument according to claim 21, wherein the temperature sensor comprises a current source with linear current-temperature dependence.

23. The instrument according to claim 18, wherein the circuitry of the electronic device causes the color intensity signal of said each color source to be a pulse-width modulated signal with duty cycle dependent on the color intensity value of said each color source.

24. The instrument according to claim 23, wherein frequency of the pulse-width modulated signal is between about 25 Hz and about 50 KHz.

25. The instrument according to claim 18, wherein the circuitry of the electronic device causes amplitude of the color intensity signal of said each color source to depend on the color intensity value of said each color source.

26. The instrument according to claim 18, wherein:

said plurality of color sources comprises a plurality of substantially monochromatic light emitters capable of emitting light of variable intensity, one light emitter per color source, the color engendered by said each color source comprising the light emitted by the light emitter of said each color source, the color intensity signal of said each color source controlling intensity of the light emitted by the light emitter of said color source; and

said combiner comprises a lens assembly positioned to receive and converge the light of the light emitters.

27. The instrument according to claim 26, wherein the plurality of substantially monochromatic light emitters comprises a red LED, a green LED, and a blue LED.

28. The instrument according to claim 21, wherein the temperature sensor is remote from the plurality of the color sources.

29. An instrument for displaying temperature as emitted light, the instrument comprising:

a multicolor LED device comprising;

a plurality of substantially monochromatic LEDs, each substantially monochromatic LED being capable of emitting light of a different wavelength, said each substantially monochromatic LED comprising an input for receiving a signal controlling the light emitted by said each substantially monochromatic LED, and

a lens assembly positioned to receive and converge the light emitted by the plurality of substantially monochromatic LEDs; and

an electronic device comprising;

an input that receives temperature readings indicative of the temperature to be displayed,

circuitry that determines a plurality of color intensity values for each temperature reading, one color intensity value per said each substantially monochromatic LED, and generates a plurality of color intensity signals to control intensities of the plurality of substantially monochromatic LEDs, one color intensity signal per said each substantially monochromatic LED, the color intensity signal of said each substantially monochromatic LED being controlled by the color intensity value of said each substantially monochromatic LED, and

a plurality of outputs coupling the color intensity signals to the inputs of the substantially monochromatic LEDs, the color intensity signal of said each substantially monochromatic LED being coupled to the input of said each substantially monochromatic LED;

wherein;

the circuitry of the electronic device comprises a memory and a digital processor executing program code stored in the memory; and

the temperature readings comprise digitized indications of temperature, the instrument further comprising an analog-to-digital converter that receives analog indications of temperature, and digitizes the analog indications of temperature to convert the analog indications of temperature into the digitized indications of temperature.

30. The instrument according to claim 29, further comprising a temperature sensor causing the analog indications of temperature to vary with temperature of the temperature sensor.

31. The instrument according to claim 30, wherein the temperature sensor is remote from the plurality of the substantially monochromatic LEDs.

32. The instrument according to claim 31, further comprising a plurality of buffer circuits coupling the outputs of the electronic device to the inputs of the substantially monochromatic LEDs, a buffer circuit per said each substantially monochromatic LED, the buffer circuit of said each substantially monochromatic LED being interposed between the input of said each substantially monochromatic LED and the output of the electronic device corresponding to said each substantially monochromatic LED.

33. The instrument according to claim 30, wherein the circuitry of the electronic device causes the color intensity signal of said each substantially monochromatic LED to be a pulse-width modulated signal with duty cycle dependent on the color intensity value of said each substantially monochromatic LED.

34. The instrument according to claim 33, wherein frequency of the pulse-width modulated signal is between about 25 Hz and 50 KHz.

35. The instrument of claim 29, further comprising a serial connection between the analog-to-digital converter and the input of the electronic device for transmitting the digitized indications of temperature from the analog-to-digital converter to the input of the electronic device.

36. The instrument of claim 29, further comprising a parallel bus connection between the analog-to-digital converter and the input of the electronic device for transmitting the digitized indications of temperature from the analog-to-digital converter to the input of the electronic device.

37. The instrument of claim 29, further comprising a wireless connection between the analog-to-digital converter and the input of the electronic device for transmitting the digitized indications of temperature from the analog-to-digital converter to the input of the electronic device.

38. An instrument for displaying temperature as color, the instrument comprising:

means for engendering colors of different wavelengths and intensities controlled by a plurality of color intensity signals, one color intensity signal per engendered color;

means for receiving temperature readings indicative of the temperature to be displayed and determining a plurality of color intensity values for each temperature reading, one color intensity value per said each engendered color;

means for generating the plurality of color intensity signals controlled by the plurality of color intensity values;

means for converging the engendered colors; and

means for receiving analog temperature indications and digitizing the analog temperature indications to obtain digitized temperature indications, wherein the temperature readings comprise the digitized temperature indications.

39. The instrument of claim 38, further comprising temperature sensing means for sensing temperature and generating the analog temperature indications.

40. A method of displaying temperature as color, the method comprising:

obtaining temperature indications by acquiring analog temperature indications and digitizing the analog temperature indications;

translating each temperature indication into a plurality of basic constituent colors by computing a plurality of color intensity values, one color intensity value per basic constituent color;

generating the colors of the plurality of basic constituent colors, each generated basic constituent color having intensity determined by the color intensity value of said each basic constituent color; and

converging the generated basic constituent colors.

41. The method of claim 40, wherein the step of generating the colors comprises the step of driving a plurality of currents through a plurality of substantially monochromatic LEDs, a current per LED, each LED emitting one of the basic constituent colors.

42. The method of claim 41, wherein the step of converging comprises the step of using a lens assembly to align the basic constituent colors emitted by the LEDs.

43. The method of claim 42, wherein the step of driving a plurality of currents comprises the step of driving a plurality of pulse-width modulated currents, each pulse-width modulated current having a duty cycle determined by the color intensity value of the constituent color corresponding to the LED driven by said each pulse-width modulated color.

44. The method of claim 43, wherein the step of acquiring analog temperature indications comprises the step of producing analog indications with substantially linear dependence on temperature.

45. The method of claim 40, wherein the step of generating colors comprises the step of displaying the colors on a screen.

46. An instrument for displaying temperature as color, the instrument comprising:

a plurality of color sources, each color source being capable of engendering color of a different wavelength and variable apparent intensity, said each color source comprising an input capable of receiving a signal controlling color intensity of said each color source; and

an electronic device comprising;

an input that receives temperature readings indicative of the temperature to be displayed,

circuitry that determines a plurality of color intensity values for each temperature reading, one color intensity value per said each color source, and generates a plurality of color intensity signals to control intensities of the plurality of color sources, one color intensity signal per said each color source, the color intensity signal of said each color source being controlled by the color intensity value of said each color source, and

a plurality of outputs coupling the color intensity signals to the inputs of the color sources, the color intensity signal of said each color source being coupled to the input of said each color source;

wherein;

the temperature readings comprise digitized indications of temperature, the instrument further comprising an analog-to-digital converter that receives analog indications of temperature, and digitizes the analog indications of temperature to convert the analog indications of temperature into the digitized indications of temperature.