Variable color display system for comparing exhibited value with limit

• US 6,734,837 B1
• Filed: 06/16/1999
• Issued: 05/11/2004
• Est. Priority Date: 01/15/1986
• Status: Expired due to Fees

• Current Assignee: Texas Digital Systems, Inc. (NCR Voyix Corporation)
• Original Assignee: Texas Digital Systems, Inc. (NCR Voyix Corporation)
• Inventors: Havel, Karel
• Primary Examiner(s): Shalwala, Bipin
• Assistant Examiner(s): LEWIS, DAVID LEE
• Application Number:
  US09/334,336
• Time in Patent Office: 1,791 Days
• Field of Search: 345/33, 345/34, 345/39, 345/40, 345/44, 345/46, 345/82, 345/83, 324/771
• US Class Current: 345/83
• CPC Class Codes: G01R 13/02 for displaying measured electric variables in digital form
• CPC Class Codes: G01R 13/26 Circuits for controlling the intensity of the electron beam or the colour of the display
• CPC Class Codes: G01R 13/405 using a plurality of active, i.e. light emitting, e.g. electro-luminescent elements, i.e. bar graphs
• CPC Class Codes: G01R 15/125 for digital multimeters
• 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 2310/0275 Details of drivers for data electrodes, other than drivers for liquid crystal, plasma or OLED displays, not related to handling digital grey scale data or to communication of data to the pixels by means of a current
• CPC Class Codes: G09G 2320/0666 for control of colour parameters, e.g. colour temperature
• CPC Class Codes: G09G 3/14 Semiconductor devices, e.g. diodes

Abstract

A variable color optical device repeatedly develops a start signal and two end signals respectively timed in relation to the start signal in accordance with the values of two sets of data. Two stable signals are developed, each from the start signal to the respective end of signal. Two control signals are applied, in accordance with the two stable signals, for respectively forwardly biasing the light emitting diodes of two primary colors.

Claims

1. A method for continuously controlling color of an optical device which includes a first light emitting diode for emitting, when forwardly biased, light signals of a first primary color, a second light emitting diode for emitting, when forwardly biased, light signals of a second primary color, and means for combining said light signals to obtain a light signal of a composite color, the method comprising:

repeatedly defining a cycle by developing a start signal at the beginning of each said cycle;

receiving n-bit data representing in value the portions of a first primary color, where n is an integer having value at least 2;

developing an end signal timed, in relation to said start signal, in accordance with the value of said data;

developing a stable signal of a first level in response to said start signal and a stable signal of an opposite level in response to said end signal;

applying a first control signal, in accordance with said stable signal of said first level, for forwardly biasing said first light emitting diode; and

applying a second control signal, in accordance with said stable signal of said opposite level, for forwardly biasing said second light emitting diode.

2. A method for continuously controlling color of an optical device which includes a first light emitting diode for emitting, when forwardly biased, light signals of a first primary color, a second light emitting diode for emitting, when forwardly biased, light signals of a second primary color, and means for combining said light signals to obtain a light signal of a composite color, the method comprising:

repeatedly defining a cycle by developing a start signal at the beginning of each said cycle;

receiving n-bit data representing in value the portions of a first primary color, where n is an integer having value at least 2;

developing an end signal timed, in relation to said start signal, in accordance with the value of said data;

developing a true output and a complementary output, said true output being set in response to said start signal and reset in response to said end signal, and said complementary output being in the opposite condition;

coupling said true output for forwardly biasing said first light emitting diode when said true output is in its set condition; and

coupling said complementary output for forwardly biasing said second light emitting diode when said complementary output is in its set condition.

3. A method for continuously controlling color of an optical device which includes a first light emitting diode for emitting, when forwardly biased, light signals of a first primary color, a second light emitting diode for emitting, when forwardly biased, light signals of a second primary color, and means for combining said light signals to obtain a light signal of a composite color, the method comprising:

repeatedly developing a start signal;

receiving first n-bit data representing in value the portions of a first primary color and second n-bit data representing in value the portions of a second primary color, where n is an integer having value at least 2;

developing a first end signal timed, in relation to said start signal, in accordance with the value of said first n-bit data;

developing a second end signal timed, in relation to said start signal, in accordance with the value of said second n-bit data;

developing a first stable signal in response to said start signal and another signal in response to said first end signal;

developing a second stable signal in response to said start signal and another signal in response to said second end signal;

applying a first control signal, in accordance with said first stable signal, for forwardly biasing said first light emitting diode; and

applying a second control signal, in accordance with said second stable signal, for forwardly biasing said second light emitting diode.

4. A method for continuously controlling color of an optical device which includes a first light emitting diode for emitting, when forwardly biased, light signals of a first primary color, a second light emitting diode for emitting, when forwardly biased, light signals of a second primary color, and means for combining said light signals to obtain a light signal of a composite color, the method comprising:

repeatedly developing a first start signal and a second start signal;

receiving first n-bit data representing in value the portions of a first primary color and second n-bit data representing in value the portions of a second primary color, where n is an integer having value at least 2;

developing a first end signal timed, in relation to said first start signal, in accordance with the value of said first n-bit data;

developing a second end signal timed, in relation to said second start signal, in accordance with the value of said second n-bit data;

developing a first stable signal in response to said first start signal and another signal in response to said first end signal;

developing a second stable signal in response to said second start signal and another signal in response to said second end signal;

applying a first control signal, in accordance with said first stable signal, for forwardly biasing said first light emitting diode; and

applying a second control signal, in accordance with said second stable signal, for forwardly biasing said second light emitting diode.

5. A method for continuously controlling color of an optical device which includes a first light emitting diode for emitting, when forwardly biased, light signals of a first primary color, a second light emitting diode for emitting, when forwardly biased, light signals of a second primary color, and means for combining said light signals to obtain a light signal of a composite color, the method comprising:

repeatedly defining a cycle by developing a start signal at the beginning of each said cycle;

receiving n-bit data representing in value the portions of a first primary color, where n is an integer having value at least 2;

developing an end signal timed, in relation to said start signal, in accordance with the value of said data;

developing a first stable color control signal from said start signal to said end signal, for forwardly biasing said first light emitting diode; and

developing a second stable color control signal from said end signal to said start signal, for forwardly biasing said second light emitting diode.

6. A method for continuously controlling color of an optical device which includes a first light emitting diode for emitting, when forwardly biased, light signals of a first primary color, a second light emitting diode for emitting, when forwardly biased, light signals of a second primary color, and means for combining said light signals to obtain a light signal of a composite color, the method comprising:

repeatedly developing a start signal;

receiving first n-bit data representing in value the portions of a first primary color and second n-bit data representing in value the portions of a second primary color, where n is an integer having value at least 2;

developing a first end signal timed, in relation to said start signal, in accordance with the value of said first n-bit data;

developing a second end signal timed, in relation to said start signal, in accordance with the value of said second n-bit data;

developing a first stable color control signal from said start signal to said first end signal, for forwardly biasing said first light emitting diode; and

developing a second stable color control signal from said start signal to said second end signal, for forwardly biasing said second light emitting diode.

7. A method for continuously controlling color of an optical device which includes a first light emitting diode for emitting, when forwardly biased, light signals of a first primary color, a second light emitting diode for emitting, when forwardly biased, light signals of a second primary color, and means for combining said light signals to obtain a light signal of a composite color, the method comprising:

repeatedly developing a first start signal and a second start signal;

receiving first n-bit data representing in value the portions of a first primary color and second n-bit data representing in value the portions of a second primary color, where n is an integer having value at least 2;

developing a first end signal timed, in relation to said first start signal, in accordance with the value of said first n-bit data;

developing a second end signal timed, in relation to said second start signal, in accordance with the value of said second n-bit data;

developing a first stable color control signal from said first start signal to said first end signal, for forwardly biasing said first light emitting diode; and

developing a second stable color control signal from said second start signal to said second end signal, for forwardly biasing said second light emitting diode.

8. A variable color optical device comprising:

means for repeatedly defining a cycle by developing a start signal at the beginning of each said cycle;

means for receiving n-bit data representing in value the portions of a first primary color, where n is an integer having value at least 2;

means for developing an end signal timed, in relation to said start signal, in accordance with the value of said data;

a first light emitting diode for emitting, when forwardly biased, light signals of a first primary color, a second light emitting diode for emitting, when forwardly biased, light signals of a second primary color, and means for combining said light signals to obtain a light signal of a composite color;

means for developing a stable signal of a first level in response to said start signal and a stable signal of an opposite level in response to said end signal;

means for applying a first control signal, in accordance with said stable signal of said first level, for forwardly biasing said first light emitting diode; and

means for applying a second control signal, in accordance with said stable signal of said opposite level, for forwardly biasing said second light emitting diode.

9. A variable color optical device comprising:

means for repeatedly defining a cycle by developing a start signal at the beginning of each said cycle;

means for receiving n-bit data representing in value the portions of a first primary color, where n is an integer having value at least 2;

means for developing an end signal timed, in relation to said start signal, in accordance with the value of said data;

a first light emitting diode for emitting, when forwardly biased, light signals of a first primary color, a second light emitting diode for emitting, when forwardly biased, light signals of a second primary color, and means for combining said light signals to obtain a light signal of a composite color;

means for developing a true output and a complementary output, said true output being set in response to said start signal and reset in response to said end signal, and said complementary output being in the opposite condition;

first means for coupling said true output for forwardly biasing said first light emitting diode when said true output is in its set condition; and

second means for coupling said complementary output for forwardly biasing said second light emitting diode when said complementary output is in its set condition.

10. A variable color optical device comprising:

means for repeatedly developing a start signal;

means for receiving first n-bit data representing in value the portions of a first primary color and second n-bit data representing in value the portions of a second primary color, where n is an integer having value at least 2;

means for developing a first end signal timed, in relation to said start signal, in accordance with the value of said first n-bit data;

means for developing a second end signal timed, in relation to said start signal, in accordance with the value of said second n-bit data;

a first light emitting diode for emitting, when forwardly biased, light signals of a first primary color, a second light emitting diode for emitting, when forwardly biased, light signals of a second primary color, and means for combining said light signals to obtain a light signal of a composite color;

means for developing a first stable signal in response to said start signal and another signal in response to said first end signal;

means for developing a second stable signal in response to said start signal and another signal in response to said second end signal;

means for applying a first control signal, in accordance with said first stable signal, for forwardly biasing said first light emitting diode; and

means for applying a second control signal, in accordance with said second stable signal, for forwardly biasing said second light emitting diode.

11. A variable color optical device comprising:

means for repeatedly developing a first start signal and a second start signal;

means for receiving first n-bit data representing in value the portions of a first primary color and second n-bit data representing in value the portions of a second primary color, where n is an integer having value at least 2;

means for developing a first end signal timed, in relation to said first start signal, in accordance with the value of said first n-bit data;

means for developing a second end signal timed, in relation to said second start signal, in accordance with the value of said second n-bit data;

a first light emitting diode for emitting, when forwardly biased, light signals of a first primary color, a second light emitting diode for emitting, when forwardly biased, light signals of a second primary color, and means for combining said light signals to obtain a light signal of a composite color;

means for developing a first stable signal in response to said first start signal and another signal in response to said first end signal;

means for developing a second stable signal in response to said second start signal and another signal in response to said second end signal;

means for applying a first control signal, in accordance with said first stable signal, for forwardly biasing said first light emitting diode; and

means for applying a second control signal, in accordance with said second stable signal, for forwardly biasing said second light emitting diode.

12. A variable color optical device comprising:

means for repeatedly defining a cycle by developing a start signal at the beginning of each said cycle;

means for receiving n-bit data representing in value the portions of a first primary color, where n is an integer having value at least 2;

means for developing an end signal timed, in relation to said start signal, in accordance with the value of said data;

a first light emitting diode for emitting, when forwardly biased, light signals of a first primary color, a second light emitting diode for emitting, when forwardly biased, light signals of a second primary color, and means for combining said light signals to obtain a light signal of a composite color;

means for developing a first stable color control signal from said start signal to said end signal, for forwardly biasing said first light emitting diode; and

means for developing a second stable color control signal from said end signal to said start signal, for forwardly biasing said second light emitting diode.

13. A variable color optical device comprising:

means for repeatedly developing a start signal;

means for receiving first n-bit data representing in value the portions of a first primary color and second n-bit data representing in value the portions of a second primary color, where n is an integer having value at least 2;

means for developing a first end signal timed, in relation to said start signal, in accordance with the value of said first n-bit data;

means for developing a second end signal timed, in relation to said start signal, in accordance with the value of said second n-bit data;

a first light emitting diode for emitting, when forwardly biased, light signals of a first primary color, a second light emitting diode for emitting, when forwardly biased, light signals of a second primary color, and means for combining said light signals to obtain a light signal of a composite color;

means for developing a first stable color control signal from said start signal to said first end signal, for forwardly biasing said first light emitting diode; and

means for developing a second stable color control signal-from said start signal to said second end signal, for forwardly biasing said second light emitting diode.

14. A variable color optical device comprising:

means for repeatedly developing a first start signal and a second start signal;

means for receiving first n-bit data representing in value the portions of a first primary color and second n-bit data representing in value the portions of a second primary color, where n is an integer having value at least 2;

means for developing a first end signal timed, in relation to said first start signal, in accordance with the value of said first n-bit data;

means for developing a second end signal timed, in relation to said second start signal, in accordance with the value of said second n-bit data;

a first light emitting diode for emitting, when forwardly biased, light signals of a first primary color, a second light emitting diode for emitting, when forwardly biased, light signals of a second primary color, and means for combining said light signals to obtain a light signal of a composite color;

means for developing a first stable color control signal from said first start signal to said first end signal, for forwardly biasing said first light emitting diode; and

means for developing a second stable color control signal from said second start signal to said second end signal, for forwardly biasing said second light emitting diode.

15. In a variable color optical device which includes a first light emitting diode for emitting, when forwardly biased, light signals of a first primary color, a second light emitting diode for emitting, when forwardly biased, light signals of a second primary color, and means for combining said light signals to obtain a light signal of a composite color, the combination comprising:

means for developing a start signal;

means for receiving first n-bit data representing in value the portion of a first primary color and second n-bit data representing in value the portion of a second primary color, where n is an integer having value at least 2;

means for developing a first end signal timed, in relation to said start signal, in accordance with the value of said first n-bit data;

means for developing a second end signal timed, in relation to said start signal, in accordance with the value of said second n-bit data;

means for applying a first control signal, from said start signal to said first end signal, for forwardly biasing said first light emitting diode; and

means for applying a second control signal, from said start signal to said second end signal, for forwardly biasing said second light emitting diode.

16. In a variable color optical device which includes a first light emitting diode for emitting, when forwardly biased, light signals of a first primary color, a second light emitting diode for emitting, when forwardly biased, light signals of a second primary color, and means for combining said light signals to obtain a light signal of a composite color, the combination comprising:

means for developing a start signal;

means for receiving n-bit data representing in value the portion of a primary color, where n is an integer having value at least 2;

means for developing an end signal timed, in relation to said start signal, in accordance with the value of said n-bit data;

means for applying a first control signal, from said start signal to said end signal, for forwardly biasing said first light emitting diode; and

means for applying a second control signal, from said start signal to said end signal, for forwardly biasing said second light emitting diode.

17. In a variable color optical device which includes a first light emitting diode for emitting, when forwardly biased, light signals of a first primary color, a second light emitting diode for emitting, when forwardly biased, light signals of a second primary color, and means for combining said light signals to obtain a light signal of a composite color, the combination comprising:

means for developing a first start signal and a second start signal;

means for receiving first n-bit data representing in value the portion of a first primary color and second n-bit data representing in value the portion of a second primary color, where n is an integer having value at least 2;

means for developing a first end signal timed, in relation to said first start signal, in accordance with the value of said first n-bit data;

means for developing a second end signal timed, in relation to said second start signal, in accordance with the value of said second n-bit data;

means for applying a first control signal, from said first start signal to said first end signal, for forwardly biasing said first light emitting diode; and

means for applying a second control signal, from said second start signal to said second end signal, for forwardly biasing said second light emitting diode.

18. In a variable color optical device which includes a first light emitting diode for emitting, when forwardly biased, light signals of a first primary color, a second light emitting diode for emitting, when forwardly biased, light signals of a second primary color, and means for combining said light signals to obtain a light signal of a composite color, the combination comprising:

means for developing a first start signal and a second start signal;

means for receiving n-bit data representing in value the portion of a primary color, where n is an integer having value at least 2;

means for developing a first end signal timed, in relation to said first start signal, in accordance with the value of said n-bit data;

means for developing a second end signal timed, in relation to said second start signal, in accordance with the value of said n-bit data;

means for applying a first control signal, from said first start signal to said first end signal, for forwardly biasing said first light emitting diode; and

means for applying a second control signal, from said second start signal to said second end signal, for forwardly biasing said second light emitting diode.

19. In a variable color optical device which includes a first light emitting diode for emitting, when forwardly biased, light signals of a first primary color, a second light emitting diode for emitting, when forwardly biased, light signals of a second primary color, and means for combining said light signals to obtain a light signal of a composite color, the combination comprising:

means for developing a first start signal and a second start signal;

means for receiving first n-bit data representing in value the portion of a first primary color and second n-bit data representing in value the portion of a second primary color, where n is an integer having value at least 2;

means for developing a first end signal timed, in relation to said first start signal, in accordance with the value of said first n-bit data;

means for developing a second end signal timed, in relation to said second start signal, in accordance with the value of said second n-bit data;

means for applying a first control signal, from said first start signal to said first end signal, for forwardly biasing said first light emitting diode;

means for applying a second control signal, from said second start signal to said second end signal, for forwardly biasing said second light emitting diode;

said first control signal and said control signal being applied substantially simultaneously.

20. In a variable color optical device which includes a first light emitting diode for emitting, when forwardly biased, light signals of a first primary color, a second light emitting diode for emitting, when forwardly biased, light signals of a second primary color, and means for combining said light signals to obtain a light signal of a composite color, the combination comprising:

means for developing a first start signal and a second start signal;

means for receiving n-bit data representing in value the portion of a primary color, where n is an integer having value at least 2;

means for developing a first end signal timed, in relation to said first start signal, in accordance with the value of said n-bit data;

means for developing a second end signal timed, in relation to said second start signal, in accordance with the value of said n-bit data;

means for applying a first control signal, from said first start signal to said first end signal, for forwardly biasing said first light emitting diode;

means for applying a second control signal, from said second start signal to said second end signal, for forwardly biasing said second light emitting diode;

said first control signal and signal being applied substantially simultaneously.