TWI411770B - Method for judging a light color of light-emitting diode - Google Patents

Abstract

A method for judging a light color of light-emitting diode includes: setting a sensing area and a sensing time of a sensing element according to an area parameter and a time parameter; receiving a light by the sensing element and then obtaining a first red weight, a first green weight and a first blue weight; comparing the first red weight, the first green weight and the first blue weight to obtain a maximum value; when the maximum value is disposed in a first range or a second range, the maximum value is in a compensation procedure to obtain a second red weight, a second green weight and a second blue weight; the second red weight, the second green weight and the second blue weight are in a format-conversion process to obtain a color value; and judging whether the color value is in a expected range or not and then outputting a result signal. Thus, the above-mentioned method can be used to improve the probability of accurately determining a color of the light.

Description

Light color determination method of light emitting diode

The present invention relates to a method for determining a luminescent color, and more particularly to a method for determining a luminescent color of a light-emitting diode.

With the continuous development of light-emitting diodes, the brightness or lifetime of light-emitting diodes has been greatly improved, and it has gradually replaced traditional lighting components. Replacing the original electroluminescent (EL) backlight and Cold Cathode Fluorescent Lamps (CCFL) backlight of the handheld device with a light-emitting diode backlight, not only the circuit design is simpler and easier, but also has higher external force resistance. Receptive. Replacing the original cold cathode lamp backlight of the liquid crystal display with a light-emitting diode backlight is not only more environmentally friendly but also displays a more vivid and beautiful display. The use of LED illumination instead of white light, halogen lamp and other lighting, not only more bright and energy-saving, the use period is longer, and the lighting speed is faster, can also reduce the rear car collision rate when used in the vehicle lights. In addition to lighting applications, most electronic products also use LEDs as indicators. For example, motherboards, display cards, and network cards also have LED indicators to indicate the operation of the board. status.

The test of light-emitting diodes has always been manual. The disadvantage of manual testing is that it is easy to produce a large discrimination error rate due to visual fatigue and subjective factors, and it is impossible to compare the brightness and the color of the light-emitting diode. Accurate judgment.

In order to solve the above problems, the prior art has proposed to replace the manual test with the light-emitting diode test device, but since the light emitted by the light-emitting diode is nonlinear (ie, composed of light of multiple wavelength bands), the light-emitting diode test device is made. The color of the LED cannot be accurately judged during the test.

In view of the above problems, the present invention provides a method for determining the color of a light-emitting diode to solve the problems of the prior art, and to improve the light-emitting diode test device to accurately determine the color of the light-emitting diode.

According to an embodiment of the method for determining the color of the light-emitting diode of the light-emitting diode according to the present invention, the method for determining the color of the light-emitting diode includes: setting the light-receiving area of the sensing element and the light-receiving area to receive light by using the area parameter and the time parameter. Obtaining a first red component, a first green component, and a first blue component by receiving the light by the sensing component; obtaining a maximum value by comparing a size of the first red component, the first green component, and the first blue component; Determining whether the maximum value is within the first interval range or the second interval range, wherein the first interval range is greater than hexadecimal 0xF2, and the second interval range is greater than or equal to hexadecimal 0x47 and less than or equal to sixteen 0x4c in hexadecimal; when the maximum value is in the range of the first interval or the second interval, the compensation process is performed to output the second red component, the second green component and the second blue component; the second red component, the second component The green component and the second blue component perform a format conversion process to obtain a color value; and determine whether the color value is within an expected range and output a result signal.

The method for determining the illuminating color of the illuminating diode according to the present invention can be used to improve the probability that the illuminating diode test device correctly determines the illuminating color. By adjusting the appropriate area parameters and time parameters, to avoid false positives of the light-emitting diode test device due to the brightness of the light being too large or too small. The color value outputted by the format conversion program can be made closer to the expected range by the compensation program to improve the judgment of the illuminating color.

The description of the present invention and the following description of the embodiments of the present invention are intended to illustrate and explain the spirit and principles of the invention, and to provide further explanation of the scope of the invention.

Please refer to FIG. 1 , which is a schematic structural view of an embodiment of a light-emitting diode test apparatus applying the light-emitting color determining method of the light-emitting diode disclosed in the present invention. In this embodiment, the LED test apparatus 100 includes at least one LED socket 102, at least one sensing component 104, at least one optical fiber 106, and a controller 108. The LED socket 102 is used to connect the LEDs 50 to the LEDs 102 and the sensing components 104 for controlling the LEDs 50 and the sensing components 104. Light (not labeled) emitted by the LEDs 50 is received and sensed by the sensing element 104 through the optical fibers 106.

Please refer to FIG. 1 and FIG. 2, and FIG. 2 is a schematic flow chart of a first embodiment of a method for determining the color of light emitted by a light-emitting diode according to the present invention. The method for determining the illuminating color of the illuminating diode includes: step 202: setting the time of receiving the ray by the photosensitive area and the photosensitive area of the sensing element by using the area parameter and the time parameter; Step 204: obtaining the first red by receiving the light by the sensing element a component, a first green component and a first blue component; step 206: comparing a size of the first red component, the first green component, and the first blue component to obtain a maximum value; and step 208: determining whether the maximum value is in the first interval Within the range or the second interval, wherein the first interval range is greater than hexadecimal 0xF2, and the second interval range is greater than or equal to hexadecimal 0x47 and less than or equal to hexadecimal 0x4c; step 210: When the maximum value is within the first interval range or the second interval range, the compensation process is performed to output the second red component, the second green component, and the second blue component; and step 212: the second red component and the second green component are And performing a format conversion process with the second blue component to obtain a color value; and step 214: determining whether the color value is within an expected range and outputting the result signal.

In the above step 202, the controller 108 sets the photosensitive area of the sensing element 104 by the area parameter, wherein the photosensitive area can be, but not limited to, twenty-five percent, fifty percent, seventy percent of the entire photosensitive area. Five or one hundred percent. The controller 108 time parameter can be used to set the time of the light received by the photosensitive area, wherein the time of receiving the light in the photosensitive area can be, but not limited to, 3rd order, 5th order, 7th order, 9th order, 11th order or 13th order, each The order may be, but not limited to, 0.001 seconds, but this embodiment is not intended to limit the invention. It should be noted that the setting of the area parameter and the time parameter is related to the light emitted by the LED 50. For example, the brightness of the red light is small, the photosensitive area required by the sensing element 104 is large, the time of receiving the light by the photosensitive area is long, the brightness of the green light is large, and the photosensitive area required by the sensing element 104 is larger. Small, the light-receiving area receives light for a short period of time.

In step 204, the sensing component 104 receives the light using the set photosensitive area and time to obtain a first red component, a first green component, and a first blue component. It should be noted that the range of the first red component may be, but not limited to, 0x00 to 0xFF in hexadecimal (ie, 0 to 255 in decimal), and the range of the first green component may be, but not limited to, 0x00 in hexadecimal. Up to 0xFF, the range of the first blue component may be, but not limited to, hexadecimal 0x00 to 0xFF, and the actual first red component, the first green component, and the first blue component are sensed by the actual sensing component 104. The light emitted by the light-emitting diode 50 is related.

Please refer to "1st" and "3rd", and "3rd" is a schematic flow chart of an embodiment of the compensation procedure in step 210 according to "2nd drawing". The compensation procedure includes: Step 302: determining that the maximum value is within the first interval range or the second interval range; Step 304: when the maximum value is within the first interval range, the first red component, the first green component, and the first blue The components respectively decrease the first predetermined value and output the second red component, the second green component and the second blue component, wherein the first predetermined value is less than or equal to eight percent of the maximum value; step 306: when the maximum value is at the second When the interval is within the range, it is determined whether there is a receiving quantity parameter; Step 308: When the maximum value is within the second interval range and the quantity parameter is not received, the maximum value is added to the second predetermined value to output the second red component and the second green component a second blue component, wherein the second predetermined value is less than or equal to eight percent of the maximum value; step 310: determining whether the size of the first red component is equal to the first when the maximum value is within the second interval range and receiving the quantity parameter a size of a green component; step 312: when the maximum value is within the second interval range, the quantity parameter is received and the first red component is not equal to the first green component, the first red component is added a second red component is outputted by a fifth digit, a first green component plus a decimal five to output a second green component, a first blue component equal to a second blue component; and a step 314: when the maximum value is in the second interval In the range, when the quantity parameter is received and the first red component is equal to the first green component, the first red component plus the decimal seven outputs the second red component, and the first green component plus the decimal five outputs the second green component. The first blue component is equal to the second blue component.

The first predetermined value of the above step 304 may be, but not limited to, sixteen in decimal, which may be adjusted according to actual needs. It should be noted that the larger the first predetermined value, the smaller the second red component, the second green component and the second blue component, that is, the brightness of the light becomes smaller. In other words, since the maximum value is within the first interval range (ie, the first red component, the first green component, and the first blue component are larger, representing a greater brightness of the light), the brightness may be caused by the sensing element 104. Misjudgment, so the first red component, the first green component and the first blue component are simultaneously reduced by the first preset value (ie, the grayscale adjustment), on the one hand, the brightness can be reduced to reduce the probability of misjudgment, and On the one hand, it will not affect the measurement results.

The above step 308 is applicable to monochromatic light (i.e., unacceptable quantity parameter) in which the brightness of the light is dark (i.e., the maximum value is within the second interval), such as, but not limited to, red light, green light, or blue light. By adding the second predetermined value to the first red component, the first green component and the first blue component, respectively, the brightness of the light is increased on the one hand to reduce the probability of misjudgment, and the measurement result is not affected on the other hand. The second predetermined value may be, but is not limited to, a decimal five, which may be adjusted according to actual needs.

The above steps 312 and 314 are applicable to the two-color light whose light intensity is dark (ie, the maximum value is in the second interval range) (ie, the acceptance quantity parameter, that is, consists of any two colors of red, green and blue). ), such as but not limited to amber. For example, when the light is amber, it is first determined whether the first red component is the same as the first green component (ie, step 310). Step 312 is performed when the first red component is different from the first green component, and step 314 is performed when the first red component is the same as the first green component, but the embodiment is not intended to limit the present invention.

In step 212, the format conversion program obtains the color value by using the second red component, the second green component, and the second blue component after the HSB formula conversion, and the color value may be zero to three hundred and sixty degrees. Among them, the HSB formula is as follows:

Where H is the color value, r is the second red component, g is the second green component, b is the second blue component, and max is the maximum of the second red component, the second green component, and the second blue component , min is the minimum of the second red component, the second green component, and the second blue component. That is, when the maximum value of the second red component, the second green component, and the second blue component is equal to the minimum value (ie, the second red component, the second green component, and the second blue component are equal, that is, the formula is satisfied ( When 1)), the color value is zero degrees. When the maximum value of the second red component, the second green component, and the second blue component is the second red component and the second green component is greater than and equal to the second blue component, the color value conforms to the above formula (2). When the maximum value of the second red component, the second green component, and the second blue component is the second red component and the second green component is less than the second blue component, the color value conforms to the above formula (3). When the maximum value among the second red component, the second green component, and the second blue component is the second green component, the color value conforms to the above formula (4). When the maximum value among the second red component, the second green component, and the second blue component is the second blue component, the color value conforms to the above formula (5).

The expected range described in the above step 214 is a range of color values of a single color. For example, the red color may be, but not limited to, zero to twelve degrees and three hundred thirty degrees to three hundred and sixty degrees (three hundred and sixty degrees). That is, zero degrees), green can be but not limited to ninety to one hundred and fifty degrees, blue can be but not limited to two hundred and ten degrees to two hundred and sixty degrees, and amber can be but not limited to thirteen degrees To the extent of sixty degrees, this embodiment is not intended to limit the invention. When the color value is within the expected range, the output signal may be a success signal (ie, the light-emitting diode 50 is qualified), and the output signal outputted when the color value is within the expected range may be a failure signal (ie, the light-emitting diode 50 is not qualified). The output signal of the result signal can be, but is not limited to, displayed by an external display unit (not drawn) of the LED test apparatus 100. That is to say, the output mode of the result signal may also be a sound prompt by the external sound unit (not drawn) of the light-emitting diode test device 100. It should be noted that the expected range is the range set before the measurement by the light-emitting diode test apparatus 100.

Please refer to FIG. 1 and FIG. 4, and FIG. 4 is a schematic flow chart of a second embodiment of a method for determining the color of light emitted by a light-emitting diode according to the present invention. In addition to the flow of the first embodiment, the method for determining the illuminating color of the illuminating diode of the present embodiment may further include: step 402: re-receiving the area parameter when the maximum value is not within the first interval range or the second interval range And the time parameter; Step 404: When the area parameter and the time parameter are re-received, increase the size of the counting parameter; Step 406: Determine that the counting parameter is less than or equal to the predetermined number of times; Step 408: When the counting parameter is less than the predetermined number of times, determine whether the maximum value is In the first interval range or the second interval range; step 410: when the counting parameter is less than the predetermined number of times and the maximum value is within the first interval range or the second interval range, the maximum value performs a compensation procedure to output a second red component, a second green component and a second blue component; step 412: determining whether the maximum value is within the first interval range or the second interval range when the counting parameter is equal to the predetermined number of times; and step 414: when the counting parameter is equal to the predetermined number of times and the maximum value When not in the first interval range or the second interval range, the first red component, the first green component, and the first blue Format conversion program component obtained color value.

The initial value of the counting parameter described in the above steps 402 and 404 may be, but not limited to, zero. When the area parameter and the time parameter are re-received, the counting parameter may be increased by one, but the embodiment is not intended to limit the present invention. The predetermined number of times described in the above step 406 may be, but is not limited to, the product of the number of all set area parameters and the number of all set time parameters. In other words, when the maximum value is not within the first interval range or the second interval range, the LED test apparatus 100 will always receive new area parameters and time parameters. When the LED device 100 measures all the available parameters to the light emitted by the LEDs 50, the maximum value obtained by the controller 108 is not within the first interval or the second interval, and the control is performed. The device 108 performs a format conversion process on the first red component, the first green component, and the first blue component to obtain a color value.

Please refer to FIG. 1 and FIG. 5, and FIG. 5 is a schematic flow chart of a third embodiment of a method for determining the color of light emitted by a light-emitting diode according to the present invention. In addition to the flow of the first embodiment, the method for determining the illuminating color of the illuminating diode of the present embodiment, after determining whether the maximum value is within the first interval range or the second interval (ie, step 208), the light emitting diode The illuminating color determining method may further include: step 502: determining that the maximum value is in the third interval range or the fourth range, wherein the third interval range is greater than or equal to 0x00 and less than 0x47, and the fourth interval range is greater than 0x4c and less than or Equal to 0xF2; Step 504: Output a failure signal when the maximum value is within the third interval range; and Step 506: When the maximum value is within the fourth interval range, the first red component, the first green component, and the first blue The component performs a format conversion process to obtain a color value, and judges whether the color value is within an expected range and outputs a result signal.

In step 504, since the maximum value is in the third interval range, the sensing element 104 barely senses the brightness of the light, so that the LED 20 is not qualified to be tested in any further steps to reduce the test time. .

In step 506, since the maximum value is in the fourth interval range, the sensing element 104 can correctly sense the state of the light, so the first red component, the first green component, and the first blue component can be directly formatted. Convert the program and determine if the color value is within the expected range.

In the above embodiment, the LED test apparatus 100 can find appropriate area parameters and time parameters in all area parameters and time parameters to avoid the LEDs 100 being too large or too small. Misjudgement, but this embodiment is not intended to limit the invention. That is to say, before the step 202 is performed, the determination process of the plurality of sets of area parameters and time parameters may be preset, wherein the plurality of sets of area parameters and time parameters are matched to correctly determine the light emitted by most of the light-emitting diodes. Conditions to avoid wasting time for judgment.

The method for determining the illuminating color of the illuminating diode according to the present invention can be used to improve the probability that the illuminating diode test device correctly determines the illuminating color. By adjusting the appropriate area parameters and time parameters to avoid false positives of the light-emitting diode test device due to the too large or too small brightness of the light, multiple sets of area parameters and time parameters can be preset to avoid waste determination. time. When the brightness of the light cannot be adjusted to the better sensing result by using the area parameter and the time parameter (ie, the maximum value is within the first interval range or within the second interval range), the brightness or light of the light may be used by the compensation program. The first red component, the first green component, and the first blue component are adjusted such that the color value outputted by the format conversion process is closer to the expected range, so as to improve the determination of the illuminating color. When the maximum value is within the third interval, the LED test device can output a failure signal, and no further steps are required to reduce the test time.

While the present invention has been described above in terms of the preferred embodiments thereof, it is not intended to limit the invention, and the invention may be modified and modified without departing from the spirit and scope of the invention. The scope of patent protection of the invention is subject to the definition of the scope of the patent application attached to this specification.

50. . . Light-emitting diode

100. . . Light emitting diode test device

102. . . Light-emitting diode socket

104. . . Sensing element

106. . . optical fiber

108. . . Controller

FIG. 1 is a schematic structural view showing an embodiment of a light-emitting diode test apparatus applying the light-emitting color determining method of the light-emitting diode disclosed in the present invention.

FIG. 2 is a schematic flow chart of a first embodiment of a method for determining a color of a light-emitting diode according to the present invention.

Figure 3 is a flow diagram of an embodiment of a compensation procedure in accordance with step 208 of Figure 2;

FIG. 4 is a schematic flow chart of a second embodiment of a method for determining the color of light emitted by a light-emitting diode according to the present invention.

FIG. 5 is a schematic flow chart of a third embodiment of a method for determining a luminescent color of a light-emitting diode according to the present invention.

Claims (4)

A method for determining a color of a light-emitting diode includes: setting an area of a sensing element and a time of receiving a light by the area parameter and a time parameter; and receiving the light by the sensing element Obtaining a first red component, a first green component, and a first blue component; comparing the first red component, the first green component, and the first blue component to obtain a maximum value; determining the maximum Whether the value is within a first interval range or a second interval range, wherein the first interval range is greater than hexadecimal 0xF2, and the second interval range is greater than or equal to hexadecimal 0x47 and less than or equal to Hexadecimal 0x4c; when the maximum value is within the first interval range or the second interval range, performing a compensation procedure to output a second red component, a second green component, and a second blue component And performing a format conversion process on the second red component, the second green component, and the second blue component to obtain a color value; and determining whether the color value is within an expected range and outputting a color value If the signal. The method for determining the illuminating color of the illuminating diode according to claim 1, wherein the illuminating color of the illuminating diode is determined after the step of determining whether the maximum value is within the first interval range or the second interval The method further includes: when the maximum value is not within the first interval range or the second interval range, re-receiving the area parameter and the time parameter; when re-receiving the area parameter and the time parameter, adding a counting parameter Determining that the counting parameter is less than or equal to a predetermined number of times; when the counting parameter is less than the predetermined number of times, determining whether the maximum value is within the first interval range or the second interval; when the counting parameter is less than the predetermined number of times And when the maximum value is within the first interval range or the second interval range, the maximum value performs the compensation procedure to output the second red component, the second green component, and the second blue component; When the parameter is equal to the predetermined number of times, determining whether the maximum value is within the first interval range or the second interval range; and when the counting parameter is equal to the predetermined time When the maximum value is not within the first interval range or the second interval range, the first red component, the first green component, and the first blue component perform the format conversion process to obtain the color value. The method for determining a luminescent color of a light-emitting diode according to claim 1, wherein the compensation program comprises: determining that the maximum value is within the first interval range or the second interval; and when the maximum value is in the first interval When the range is within, the first red component, the first green component, and the first blue component are respectively decreased by a first predetermined value, and the second red component, the second green component, and the second blue component are output. Wherein the first predetermined value is less than or equal to eight percent of the maximum value; when the maximum value is within the second interval, determining whether a quantity parameter is received; when the maximum value is within the second interval and When the quantity parameter is not received, the maximum value is added to a second predetermined value to output the second red component, the second green component and the second blue component, wherein the second predetermined value is less than or equal to the maximum value Eighty percent; when the maximum value is within the second interval, when the quantity parameter is received and the first red component is not equal to the first green component, the first red component plus the decimal five is output Second red a color component, the first green component plus a decimal five to output the second green component, the first blue component being equal to the second blue component; and when the maximum value is within the second interval, receiving the color component And when the first red component is equal to the first green component, the first red component is added to the seventh decimal component to output the second red component, and the first green component is added to the decimal five to output the second green component. a component, the first blue component being equal to the second blue component. The method for determining the illuminating color of the illuminating diode according to claim 1, wherein after determining whether the maximum value is within the first interval range or the second interval, the illuminating color determining method of the illuminating diode is more The method includes: determining that the maximum value is in a third interval range or a fourth interval range, wherein the third interval range is greater than or equal to 0x00 and less than 0x47, and the fourth interval range is greater than 0x4c and less than or equal to 0xF2; When the maximum value is within the third interval range, a failure signal is output; and when the maximum value is within the fourth interval range, the first red component, the first green component, and the first blue component are performed. The format conversion program obtains the color value and determines whether the color value is within the expected range and outputs the result signal.