Light source machine light mixing system applied to image sensing chip test

Abstract

The invention provides a light source machine light mixing system applied to image sensing chip testing, which comprises a light source machine, an optical measuring instrument and a computer, the light source machine comprises a microcontroller, a light-emitting diode driver, a light-emitting diode array and a memory unit, the light-emitting diode array comprises a plurality of light-emitting diode lamp beads, and the memory unit is connected with the microcontroller. The light-emitting diode lamp beads comprise a white red light-emitting diode, a white green light-emitting diode and a white blue light-emitting diode; the optical measuring instrument can receive a light source generated by the light emitting diode array and read out spectral data of the light source, the computer is connected with the optical measuring instrument and the microcontroller, and after the spectral data are received and calculated by the microcontroller, the spectral data are sent to the optical measuring instrument through the computer. And the microcontroller controls the light-emitting diode driver, so that the light-emitting diode array generates the required light source brightness.

Description

Technical Field

[0001] The present invention relates to the technical field of a light source machine, and more particularly to a light source machine for image sensor chip testing to perform a light mixing operation system. Background Art

[0002] The light source machine used for image sensing chip testing must be able to provide a uniform light source. The best standard light source is simulated sunlight (or daylight), and the color rendering index (CRI) value is 100, so that the image sensor can generate a correct response signal corresponding to the light source, which is convenient for the detection operation. At present, light source machines using light emitting diodes (LEDs) as light sources generally cannot meet the CRI 100 requirement. Therefore, before the light source machine leaves the factory, it must be calibrated and related parameters adjusted using a computer and specific software to meet the test conditions required by the manufacturer. However, after the light source machine has been used for a period of time, it still needs to be calibrated or fine-tuned to maintain the quality of image sensing chip testing. However, it is known that light source machine manufacturers usually use a set of optical integrating sphere equipment to calibrate the light source, and chip testing manufacturers do not have this equipment. Therefore, the light source machine must be sent back to the original factory for calibration and fine-tuning, which is very troublesome. Therefore, the present invention provides a light source machine mixing system used for image sensing chip testing to solve this problem. Summary of the invention

[0003] The present invention is a light source machine light mixing system used for image sensing chip testing. The light source machine is used to cooperate with the operation of an optical measuring instrument and a computer to calibrate and adjust the light mixing operation of the light source machine. The optical measuring instrument can use a CL-200A color illuminance meter for visible light, and a power meter calibration box (Powermeter Calibrationbox) for invisible light. In this way, whether it is in the light source machine manufacturer or in the chip testing factory area, the light source machine can be calibrated quickly and conveniently, so that the light source machine can maintain a good working condition at any time.

[0004] To achieve the above-mentioned purpose, the present invention adopts the following technical solutions:

[0005] The present invention is a light source machine light mixing system for testing an image sensing chip, comprising: a light source machine, an optical measuring instrument and a computer, wherein the light source machine comprises: a microcontroller, a light emitting diode driver, a light emitting diode array and a memory unit; the microcontroller is connected to the light emitting diode driver, and the light emitting diode driver is controlled by the microcontroller; the light emitting diode array is connected to the light emitting diode driver, and the light emitting diode array comprises a plurality of light emitting diode lamp beads, and the light emitting diode driver is responsible for driving the light emitting diode lamp beads to light up, and the light emitting diode lamp beads comprise white-red light emitting diodes, white-green light emitting diodes and white-blue light emitting diodes; the memory unit is connected to the microcontroller, and stores data of the light emitting diode driver driving the light emitting diode lamp beads; the optical measuring instrument can receive the light source generated by the light emitting diode array and read out the spectrum data of the light source; the computer is respectively connected to the optical measuring instrument and the microcontroller, and the computer can receive the spectrum data of the optical measuring instrument and then transmit the spectrum data back to the microcontroller, and the microcontroller controls the light emitting diode driver after the microcontroller calculates and calibrates according to a program, so that the light emitting diode array generates the required light source brightness.

[0006] As one of the preferred embodiments, the spectral data includes color coordinates and color temperature.

[0007] As one of the better preferred embodiments, the memory unit stores the original setting data. After the microcontroller receives the spectral data from the computer, the microcontroller recalibrates the received spectral data and the setting data according to the program calculation results through the internal processor to provide new mixing parameters, and provides current values ​​of three different colors of the white-red light emitting diode, the white-green light emitting diode and the white-blue light emitting diode.

[0008] As one of the better preferred embodiments, the computer can receive a setting data. After the spectral data and the setting data are transmitted by the computer, the microcontroller will recalibrate and provide new mixing parameters according to the program calculation results through the internal processor, provide the current values ​​of the three different colors of the white-red light emitting diode, the white-green light emitting diode and the white-blue light emitting diode, and store the calculation results in the memory unit.

[0009] Compared with the prior art, the light source mixing system used in the present invention for image sensor chip testing can maintain the spectral color coordinates of the light source within the range of + / -0.0005 (0.5 ten-thousandths), and the working range of the light source brightness can reach 1nW to 1,000mW (0.1 millionths), which meets the current image sensor chip testing requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 This is a schematic diagram of the present invention.

[0011] Explanation of symbols:

[0012] 10: Light source machine

[0013] 11: Microcontroller

[0014] 12: LED driver

[0015] 13: LED array

[0016] 131: LED lamp beads

[0017] 14: Memory Unit

[0018] 20: Optical measuring instruments

[0019] 30: Computer DETAILED DESCRIPTION

[0020] The technical solution of the present invention will be clearly and completely described below in conjunction with specific embodiments and accompanying drawings. It should be noted that when a component is referred to as being "mounted on or fixed to" another component, it means that it can be directly on the other component or there can also be a central component. When a component is considered to be "connected" to another component, it means that it can be directly connected to the other component or there can be a central component at the same time. In the illustrated embodiments, the directions indicating up, down, left, right, front and back are relative, and are used to explain that the structures and movements of different components in this case are relative. These representations are appropriate when the components are in the positions shown in the figures. However, if the description of the component positions changes, it is believed that these representations will also change accordingly.

[0021] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which the present invention pertains. The terms used herein are for the purpose of describing specific embodiments only and are not intended to limit the present invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0022] like Figure 1 The present invention is a light source machine light mixing system used for image sensor chip testing, including a light source machine 10, an optical measurement instrument 20 and a computer 30.

[0023] The light source machine 10 includes a microcontroller 11, an LED driver 12, an LED array 13 and a memory unit 14. The microcontroller (MCU) 11 is responsible for controlling the LED driver 12. The microcontroller 11 has a processor that can perform related operations. The LED driver 12 is responsible for driving the LED array 13 so that the LED array 13 produces the required brightness. The LED array 13 includes a plurality of LED lamp beads 131. The LED lamp beads 131 used in the present invention are relatively special. The LED lamp beads 131 are provided with white-red LEDs, white-green LEDs and white-blue LEDs, which are different from the known single light source color LEDs. The memory unit 14 is connected to the microcontroller 11 and stores the current value of the white-red LEDs, white-green LEDs and white-blue LEDs in the LED lamp beads 131 driven by the LED driver 12; thereby, the microcontroller 11 causes the LED array 13 to produce a predetermined brightness through the LED driver 12.

[0024] The optical measuring instrument 20 can receive the light source generated by the LED array 13 and read out the spectrum data of the light source, which includes color coordinates and color temperature. Since the light source to be detected is divided into two types: visible light and invisible light: if it is visible light, such as white light, red light (R), green light (G), and blue light (B), the optical measuring instrument 20 uses a calibration box of a CL200A color illuminance meter. CL200A is a color illuminance meter produced by KONICA MINOLTA of Japan. If it is invisible light, such as far infrared (IR8, IR9), the optical measuring instrument 20 uses a calibration box of a power meter.

[0025] The computer 30 is electrically connected to the optical measuring instrument 20 and the microcontroller 11 in the light source 10. After receiving the spectrum data from the optical measuring instrument 20, the computer 30 converts the spectrum data into various data after analysis and interpretation and transmits the data back to the microcontroller 11. The microcontroller 11 recalibrates the setting data originally stored in the memory unit 14 or the setting data transmitted by the computer 30 and the data received from the optical measuring instrument 20 by the computer 30 according to the program calculation results to provide new light mixing parameters, provide the current values ​​of the three different colors of white-red light emitting diodes, white-green light emitting diodes and white-blue light emitting diodes, and store the calculation results in the memory unit 14. The calibration is continuously cycled to finally accurately achieve the color coordinates and color temperature required by the customer.

[0026] Next, the actual operation mode of the present invention is described:

[0027] T: is the target light source.

[0028] H: represents white-red light emitting diode.

[0029] M: stands for white green light emitting diode.

[0030] L: represents white-blue light emitting diode.

[0031] The color coordinates measured by the optical measuring instrument 20 are represented by the parameters x value and y value, and the color coordinates refer to the CIE 1931 color space diagram. The optical measuring instrument 20 can also measure the illumination of light, and the illumination unit is Lux, which refers to the luminous flux per unit area of ​​the surface of the illuminated object. After conversion by the internal calculation formula, the optical measuring instrument 20 can also obtain three tristimulus values ​​X, Y and Z.

[0032] When the light source calibration can be performed, the single color calibration is performed first. That is, the microcontroller 11 controls the LED driver 12, and the LED driver 12 is responsible for driving the LED array 13, so that the LED array 13 generates the required brightness, first only white-red light, and the optical measuring instrument 20 receives the brightness of the LED array 13 and generates the following data:

[0033] HLux: Illuminance measured by the white-red LED.

[0034] Hx: The x value measured by the white-red light emitting diode.

[0035] Hy: The y value measured for the white-red light emitting diode.

[0036] Then, according to the above values, the three tri-color stimulus values ​​HY, HX and HZ of the white-red light setting are calculated. The calculation formula is as follows:

[0037] HY=HLux

[0038] HX=Hx / Hy*HLux

[0039] HZ=(1-Hx-Hy) / Hy*HLux

[0040] Next, the microcontroller 11 controls the LED driver 12, which is responsible for driving the LED array 13 to make the LED array 13 produce the required brightness, only white-green light. After the optical measuring instrument 20 receives the brightness of the LED array 13, the following data will be generated:

[0041] MLux: The illuminance measured by the white-green LED.

[0042] Mx: The x value measured for the white-green LED.

[0043] My: The y value measured for the white-green LED.

[0044] Then, according to the above values, the three tri-color stimulus values ​​MY, MX and MZ of the white-green light setting are calculated. The calculation formula is as follows:

[0045] MY=MLux

[0046] MX=Mx / My*MLux

[0047] MZ=(1-Mx-My) / My*MLux

[0048] Next, the microcontroller 11 controls the LED driver 12, which is responsible for driving the LED array 13 to make the LED array 13 generate the required brightness, that is, only white-blue light. After the optical measuring instrument 20 receives the brightness of the LED array 13, the following data will be generated:

[0049] LLux: The illuminance measured by the white blue light emitting diode.

[0050] Lx: The x value measured for the white blue light emitting diode.

[0051] Ly: The y value measured for the white blue light emitting diode.

[0052] Then, the three tri-color stimulus values ​​LY, LX and LZ of the white-blue light setting are calculated based on the above values. The calculation formula is as follows:

[0053] LY=LLux

[0054] LX=Lx / Ly*LLux

[0055] LZ=(1-Lx-Ly) / Ly*LLux

[0056] The color coordinates of the target light source T to be achieved are Tx and Ty, and the three color stimulus values ​​TY, TX, and TZ of the target light source T are calculated using the following formula:

[0057] TY=HY+MY+LY

[0058] TX=Tx / Ty*TY

[0059] TZ=(1-Tx-Ty) / Ty*TY

[0060] To generate the target light source T, the light emission ratio of the three-color LEDs must be calculated according to the following formula.

[0061] HY*Ratio_H+MY*Ratio_M+LY*Ratio_L=TY

[0062] HX*Ratio_H+MX*Ratio_M+LX*Ratio_L=TX

[0063] HZ*Ratio_H+MZ*Ratio_M+LZ*Ratio_L=TZ

[0064] Among them, Ratio_H, Ratio_M and Ratio_L represent unknown numbers, which are also the ratio values ​​that need to be calculated later. Among them, Ratio_H represents the luminous ratio value of white-red light, Ratio_M represents the luminous ratio value of white-green light, and Ratio_L represents the luminous ratio value of white-blue light.

[0065] In the present invention, the tristimulus values ​​of the three-color light source can be obtained through measurement, that is, by measuring a single light source in the above-mentioned manner, such as HLux, Hx and Hy of white-red light, MLux, Mx and My of white-green light, and LLux, Lx and Ly of white-blue light. Finally, TY, TX and TZ are calculated according to paragraphs

[0048] to

[0050] , and these values ​​are then substituted into the three-variable linear simultaneous equations in paragraphs

[0052] to

[0054] , and calculated according to the Cramer formula, and the calculation formula is:

[0066] delta_H=(TX*MY*LZ)+(MX*LY*TZ)+(LX*TY*MZ)-(LX*MY*TZ)-(MX*TY*LZ)-(TX*LY*MZ)

[0067] delta_M=(HX*TY*LZ)+(TX*LY*HZ)+(LX*HY*TZ)-(LX*TY*HZ)-(TX*HY*LZ)-(HX*LY*TZ)

[0068] delta_L=(HX*MY*TZ)+(MX*TY*HZ)+(TX*HY*MZ)-(TX*MY*HZ)-(MX*HY*TZ)-(HX*TY*MZ)

[0069] delta_T=(HX*MY*LZ)+(MX*LY*HZ)+(LX*HY*MZ)-(LX*MY*HZ)-(MX*HY*LZ)-(HX*LY*MZ)

[0070] Where delta_H, delta_M, delta_L, delta_T are the values ​​of the corresponding determinants of ΔH, ΔM, ΔL, and ΔT, so:

[0071] Ratio_H=delta_H / delta_T

[0072] Ratio_M=delta_M / delta_T

[0073] Ratio_L=delta_L / delta_T

[0074] If delta_T is not equal to 0, then the simultaneous equations have a unique solution.

[0075] If delta_T is equal to 0, and at least one of delta_H, delta_M, and delta_L is not 0, there is no solution.

[0076] If delta_T is equal to 0, delta_H=delta_M=delta_L=0, there are infinite solutions.

[0077] Since negative numbers cannot be input into the current-controlled light source, the final results Ratio_H, Ratio_M, and Ratio_L can only be > 0, otherwise the target light source cannot be mixed out.

[0078] After calculating Ratio_H, Ratio_M and Ratio_L, the current value of the corresponding ratio is adjusted to drive the white-red light emitting diode, the white-green light emitting diode and the white-blue light emitting diode to generate the target light source T. During the fine-tuning process, due to the nonlinearity between current and brightness, even if the ratio is calculated and the light is mixed according to the ratio, there will still be a large error, and the color coordinates will change slightly due to the change in brightness, which is also a factor of error. It is necessary to correct the error through the second or even multiple three-color light source characteristic measurements. The characteristics of the three-color light source are measured again based on the results of the first calculation to calculate a new ratio and then multiply it by the first current setting for correction. In this way, the reciprocating convergence will get closer and closer to the target light source value.

[0079] The above is only a preferred embodiment of the present invention and is not intended to limit the scope of the embodiments of the present invention. That is, all equivalent changes and modifications made according to the scope of the patent application of the present invention are covered by the patent scope of the present invention.

Claims

1. A light source machine mixing system using an image sensing chip test, characterized in that: include: A light source machine, comprising: A microcontroller; a light emitting diode driver connected to the microcontroller, and the light emitting diode driver is controlled by the microcontroller; an LED array connected to the LED driver, the LED array including a plurality of LED lamp beads, the LED driver is responsible for driving the LED lamp beads to light up, the LED lamp beads including white-red LEDs, white-green LEDs and white-blue LEDs; A memory unit, connected to the microcontroller, storing data of the light emitting diode driver driving the light emitting diode lamp bead; an optical measuring instrument capable of receiving the light source generated by the light emitting diode array and reading out the spectrum data of the light source; A computer is connected to the optical measuring instrument and the microcontroller respectively. The computer can receive the spectral data of the optical measuring instrument and then transmit the spectral data back to the microcontroller. After the microcontroller calculates and calibrates according to a program, the microcontroller controls the light emitting diode driver to make the light emitting diode array generate the required light source brightness.

2. The light source machine mixing system using image sensing chip testing according to claim 1, characterized in that: The spectral data includes color coordinates and color temperature.

3. The light source machine light mixing system using image sensing chip testing according to claim 1, characterized in that: The memory unit stores the original setting data. After the microcontroller receives the spectrum data transmitted by the computer, the microcontroller recalibrates the received spectrum data and the setting data according to the program calculation results through the internal processor to provide new mixing parameters, and provides current values ​​of the white-red light emitting diode, the white-green light emitting diode and the white-blue light emitting diode of three different colors.

4. The light source machine light mixing system using image sensing chip testing according to claim 1, characterized in that: The computer can receive a setting data. After the spectral data and the setting data are transmitted by the computer, the microcontroller recalibrates and provides new light mixing parameters according to the program calculation results through the internal processor, provides the current values ​​of the white-red light emitting diode, the white-green light emitting diode and the white-blue light emitting diode of three different colors, and stores the calculation results in the memory unit.

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