Calibration matching method of atmosphere lamp user color

Abstract

The application discloses a calibration matching method for atmosphere lamp user color, and belongs to the field of atmosphere lamp production technology.The method comprises the following steps: installing K PCBA boards on a lamp shell;measuring color coordinate values and luminous flux values of the atmosphere lamps;taking the color coordinate values and luminous flux values of any atmosphere lamp as calibration data, and calculating a pwm duty cycle;a controller controls a LED driver to drive the K atmosphere lamps to complete primary calibration;removing the PCBA board in any atmosphere lamp, and measuring the actual luminous flux value;comparing the actual luminous flux value with a target luminous flux value to obtain a ratio r;increasing the target luminous flux value Y_t by r times, combining the calibration data, and calculating a pwm target duty cycle;a controller controls a LED driver to drive the K atmosphere lamps to complete secondary calibration;measuring the color coordinate values and luminous flux values of the atmosphere lamps after calibration, and comparing the values with customer standards.The method realizes assembly user color adjustment of multiple styles of atmosphere lamps, meets the matching degree of the colorimetric value control of the atmosphere lamps and the real environment demand, greatly saves production time cost, and improves production efficiency.

Description

Technical Field

[0001] This invention relates to the field of LED light color calibration technology, and in particular to a method for calibrating and mixing user colors for ambient lights. Background Technology

[0002] Currently, color calibration for automotive ambient lighting fixtures typically involves calibrating the LEDs on the PCBA board to ensure they meet customer standards. However, automotive ambient lighting fixtures come in various styles, primarily IP ambient lighting, door panel ambient lighting, and A-pillar ambient lighting. Due to the different light transmittance of the materials used in these different styles, and the uncertainties surrounding the types and properties of early fixture housing materials, various fixtures, when illuminating the same color under full vehicle conditions, exhibit inconsistent performance.

[0003] The drawback of existing technology is that different styles of ambient lighting fixtures produce inconsistent effects when illuminating the same color. Summary of the Invention

[0004] This invention provides a method for calibrating and matching the user color of ambient lights, enabling the adjustment of the overall user color of multiple styles of ambient light fixtures.

[0005] To achieve the above objectives, a method for calibrating and mixing user colors for ambient lighting is provided, which includes the following key steps:

[0006] Step 1: Install the corresponding lamp housings for the K ambient lights onto the K PCBA boards that have completed LED bare lamp color calibration;

[0007] Step 2: Turn on K ambient lights respectively, and use a spectrometer to measure the actual color coordinates and actual luminous flux of the K ambient lights.

[0008] Step 3: Combine the actual chromaticity coordinates and actual luminous flux values ​​of any ambient light fixture [(cx_r, cy_r), (cx_g, cy_g), (cx_b, cy_b)] and [Y_r, Y_g, Y_b] as color calibration data. Combine this with the target chromaticity coordinates (Cx_t, Cy_t) and target luminous flux value Y_t of the target color to calculate the PWM duty cycle.

[0009] Step 4: The PWM duty cycle is solidified into the ambient light fixture program and the program is burned once. The controller controls the LED driver to drive K ambient light fixtures to complete the initial color calibration.

[0010] Step 5: Take out the PCBA board from any ambient light fixture and use a spectrometer to measure the measured luminous flux value Y' of the PCBA board;

[0011] Step 6: Compare the measured luminous flux value Y' with the target luminous flux value Y_t to obtain their ratio r.

[0012] Step 7: Increase the target luminous flux value Y_t by a factor of r to obtain the color calibration luminous flux value Y_t'. Use the target color coordinate value (Cx_t, Cy_t) and the color calibration luminous flux value Y_t' as the color calibration target data. Combine the color calibration data to calculate the PWM target duty cycle.

[0013] Step 8: The target PWM duty cycle is solidified into the ambient light fixture program, and the PWM duty cycle is replaced. Then the program is burned once. The controller controls the LED driver to drive K ambient light fixtures to complete the secondary color calibration.

[0014] Step 9: Turn on the K ambient lights after the second color calibration, and use a spectrometer to measure the color coordinates and luminous flux of each of the K ambient lights after color calibration. Then compare the color coordinates and luminous flux with the customer's standard color coordinates and luminous flux.

[0015] If the deviations of the x and y coordinates of the calibrated color coordinates from the customer's standard color coordinates are both within ±0.02, and the deviations of the luminous flux values ​​of the calibrated color coordinates from the customer's standard luminous flux values ​​are both within ±10%, then the calibration is successful; otherwise, the calibration fails, and the process returns to step 2.

[0016] If the color calibration fails, return to step 2 and perform user color adjustments again on the K ambient light fixtures that failed the calibration, based on the hardware settings after the previous calibration, until the calibration is successful.

[0017] Through the above design, the same method and steps can be used to adjust the assembly user color of multiple styles of ambient lights, so that the performance of multiple styles of ambient lights is consistent when the same color is lit under the whole vehicle conditions, and the matching degree of color value control and real environment needs is met.

[0018] Furthermore, this invention does not require individual assembly color calibration for each lighting product. Instead, the lighting products that require assembly color calibration are first calibrated as bare lamps, and then the assembly color is adjusted. This design not only enables ambient lighting products to achieve the performance effect of assembly color calibration, but also greatly saves production time and costs and improves production efficiency.

[0019] Preferably, in step 3, the formula for calculating the PWM duty cycle is as follows:

[0020]

[0021] LED_R_Y=Y_r

[0022]

[0023]

[0024] LED_G_Y=Y_g

[0025]

[0026]

[0027] LED_B_Y=Y_b

[0028]

[0029]

[0030] Tar_Y=Y_t

[0031]

[0032]

[0033] Where (Tar_X, Tar_Y, Tar_Z) represent the X, Y, and Z tristimulus values ​​of the target color, [(LED_R_X, LED_R_Y, LED_R_Z), (LED_G_X, LED_G_Y, LED_G_Z), (LED_B_X, LED_B_Y, LED_B_Z)] represent the combination of X, Y, and Z tristimulus values ​​of the red, green, and blue channels of the color calibration data, and (Duty_r, Duty_g, Duty_b) represent the PWM duty cycle.

[0034] Preferably, in step 7, the formula for calculating the target duty cycle of PWM is as follows:

[0035]

[0036] Tar_Y′=Y_t′

[0037]

[0038]

[0039] Where (Tar_X′, Tar_Y′, Tar_Z′) represent the X, Y, and Z tristimulus values ​​of the color calibration target data, and (Duty_r′, Duty_g′, Duty_b′) represent the PWM target duty cycle.

[0040] Preferably, the lamp style is either an IP ambient light lamp style; or a door panel ambient light lamp style; or a roof ambient light lamp style; or an A-pillar ambient light lamp style; or a B-pillar ambient light lamp style.

[0041] Preferably, the spectrometer can be an integrating sphere, an imaging colorimeter, or an illuminometer. The specific choice can be made based on actual usage requirements.

[0042] As a preferred option: the driving circuit of the A-pillar ambient light fixture consists of a controller, an LED driver, three RGB LED beads, a resistor R1, a capacitor C1, a capacitor C2, a capacitor C3, a capacitor C4, a capacitor C5, a capacitor C6, a diode D1, a bidirectional diode D2, and a ferrite bead L1.

[0043] The output terminal of the controller is connected to the input terminal of the LED driver via the magnetic bead L1. The output terminal of the controller is also grounded after being connected in series with a bidirectional diode D2. The input terminal of the LED driver is also grounded after being connected in series with a capacitor C5.

[0044] The input terminal of the controller is connected to the output terminal of the LED driver, and the input terminal of the controller is also grounded after being connected in series with capacitor C6.

[0045] The power supply terminal of the controller is connected in series with diode D1 and then connected to the front end of resistor R1. The power supply terminal of the controller is also connected in series with capacitor C3 and capacitor C4 and then grounded. The rear end of resistor R1 is connected to the power supply. The rear end of resistor R1 is also connected in series with capacitor C2 and then grounded. The grounding terminal of the controller is grounded.

[0046] The three LED control terminals HV0, HV1 and HV2 of the LED driver are respectively connected to the cathodes of the three RGB LED beads; the power supply terminal of the LED driver is connected to the power supply, and the ground terminal of the LED driver is grounded.

[0047] Preferably, the LED driver is an MLX81108 chip.

[0048] The beneficial effects of this invention are: it enables user color adjustment of multiple styles of ambient lighting fixtures, which not only meets the matching degree between the color value control of ambient lighting fixtures and the needs of the real environment, but also greatly saves production time and costs and improves production efficiency. Attached Figure Description

[0049] Figure 1 This is the overall flowchart of the present invention;

[0050] Figure 2 This is a schematic diagram of the driving circuit for the ambient lighting fixture on column A in the embodiment. Detailed Implementation

[0051] The present invention will be further described in detail below with reference to the accompanying drawings and specific examples. The following embodiments or drawings are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0052] In this embodiment, the ambient lighting fixtures on column A are selected for calibration and matching of user colors. An integrating sphere is used as the spectrometer.

[0053] like Figure 1 As shown: A method for calibrating and mixing user colors for ambient lighting, comprising the following steps:

[0054] Step 1: Install the corresponding light fixture housings of K A-pillar ambient lights onto the K PCBA boards that have completed LED bare light color calibration;

[0055] Step 2: Turn on the K A-pillar ambient lights respectively, and use a spectrometer to measure the actual color coordinates and actual luminous flux of the K A-pillar ambient lights.

[0056] Step 3: Combine the actual color coordinates and actual luminous flux values ​​of any A-pillar ambient light fixture [(cx_r, cy_r), (cx_g, cy_g), (cx_b, cy_b)] and [Y_r, Y_g, Y_b] as color calibration data. Combine this with the target color coordinates (Cx_t, Cy_t) and target luminous flux value Y_t of the target color to calculate the PWM duty cycle.

[0057] Step 4: The PWM duty cycle is solidified into the A-pillar ambient light fixture program and the program is burned once. The controller X1 controls the LED driver U1 to drive K A-pillar ambient light fixtures to complete the initial color calibration.

[0058] Step 5: Take out the PCBA board from any of the A-pillar ambient light fixtures and use a spectrometer to measure the measured luminous flux value Y' of the PCBA board;

[0059] Step 6: Compare the measured luminous flux value Y' with the target luminous flux value Y_t to obtain their ratio r.

[0060] Step 7: Increase the target luminous flux value Y_t by a factor of r to obtain the color calibration luminous flux value Y_t'. Use the target color coordinate value (Cx_t, Cy_t) and the color calibration luminous flux value Y_t' as the color calibration target data. Combine the color calibration data to calculate the PWM target duty cycle.

[0061] Step 8: Solidify the target PWM duty cycle into the A-pillar ambient light fixture program, replace the PWM duty cycle, and then burn the program once. The controller X1 controls the LED driver U1 to drive K A-pillar ambient light fixtures to complete the secondary color calibration.

[0062] Step 9: Turn on the K A-pillar ambient lights after the second color calibration, and use a spectrometer to measure the color coordinates and luminous flux of each of the K A-pillar ambient lights after color calibration. Then compare the color coordinates and luminous flux with the customer's standard color coordinates and luminous flux.

[0063] If the deviations of the x and y coordinates of the calibrated color coordinates from the customer's standard color coordinates are both within ±0.02, and the deviations of the luminous flux values ​​of the calibrated color coordinates from the customer's standard luminous flux values ​​are both within ±10%, then the calibration is successful; otherwise, the calibration fails, and the process returns to step 2.

[0064] Specifically, in step 3, the formula for calculating the PWM duty cycle is as follows:

[0065]

[0066] LED_R_Y=Y_r

[0067]

[0068]

[0069] LED_G_Y=Y_g

[0070]

[0071]

[0072] LED_B_Y=Y_b

[0073]

[0074]

[0075] Tar_Y=Y_t

[0076]

[0077]

[0078] Where (Tar_X, Tar_Y, Tar_Z) represent the X, Y, and Z tristimulus values ​​of the target color, [(LED_R_X, LED_R_Y, LED_R_Z), (LED_G_X, LED_G_Y, LED_G_Z), (LED_B_X, LED_B_Y, LED_B_Z)] represent the combination of X, Y, and Z tristimulus values ​​of the red, green, and blue channels of the color calibration data, and (Duty_r, Duty_g, Duty_b) represent the PWM duty cycle.

[0079] In step 7, the formula for calculating the target duty cycle of PWM is as follows:

[0080]

[0081] Tar_Y′=Y_t′

[0082]

[0083]

[0084] Where (Tar_X′, Tar_Y′, Tar_Z′) represent the X, Y, and Z tristimulus values ​​of the color calibration target data, and (Duty_r′, Duty_g′, Duty_b′) represent the PWM target duty cycle.

[0085] like Figure 2 As shown: The driving circuit of the A-pillar ambient light fixture consists of controller X1, LED driver U1, three RGB LED beads, resistor R1, capacitors C1, C2, C3, C4, C5, C6, diode D1, bidirectional diode D2, and ferrite bead L1.

[0086] The output terminal of the controller X1 is connected to the input terminal of the LED driver U1 via the magnetic bead L1. The output terminal of the controller X1 is also grounded after being connected in series with a bidirectional diode D2. The input terminal of the LED driver U1 is also grounded after being connected in series with a capacitor C5.

[0087] The input terminal of the controller X1 is connected to the output terminal of the LED driver U1, and the input terminal of the controller X1 is also grounded after being connected in series with a capacitor C6.

[0088] The power supply terminal of the controller X1 is connected in series with diode D1 and then connected to the front end of resistor R1. The power supply terminal of the controller X1 is also connected in series with capacitor C3 and capacitor C4 and then grounded. The rear end of resistor R1 is connected to the power supply. The rear end of resistor R1 is also connected in series with capacitor C2 and then grounded. The grounding terminal of the controller X1 is grounded.

[0089] The three LED control terminals HV0, HV1 and HV2 of the LED driver U1 are respectively connected to the cathodes of the three RGB LED beads; the power supply terminal of the LED driver U1 is connected to the power supply, and the ground terminal of the LED driver U1 is grounded.

[0090] The LED driver U1 is specifically an MLX81108 chip.

[0091] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A method for calibrating and mixing user colors for ambient lighting, characterized in that, Includes the following steps: Step 1: Install the corresponding lamp housings for the K ambient lights onto the K PCBA boards that have completed LED bare lamp color calibration; Step 2: Turn on K ambient lights respectively, and use a spectrometer to measure the actual color coordinates and actual luminous flux of the K ambient lights. Step 3: Combine the actual chromaticity coordinates and actual luminous flux values ​​of any ambient light fixture [(cx_r, cy_r), (cx_g, cy_g), (cx_b, cy_b)] and [Y_r, Y_g, Y_b] as color calibration data. Combine this with the target chromaticity coordinates (Cx_t, Cy_t) and target luminous flux value Y_t of the target color to calculate the PWM duty cycle. Step 4: The PWM duty cycle is solidified into the ambient light fixture program and the program is burned once. The controller (X1) controls the LED driver (U1) to drive K ambient light fixtures to complete the initial color calibration. Step 5: Take out the PCBA board from any ambient light fixture and use a spectrometer to measure the measured luminous flux value Y' of the PCBA board; Step 6: Compare the measured luminous flux value Y' with the target luminous flux value Y_t to obtain their ratio r, r = ; Step 7: Increase the target luminous flux value Y_t by a factor of r to obtain the color calibration luminous flux value Y_t'. Use the target color coordinate values ​​(Cx_t, Cy_t) and the color calibration luminous flux value Y_t' as the color calibration target data. Combine the color calibration data to calculate the PWM target duty cycle. The calculation formula is as follows: ； ； ； ； in,( , ', The values ​​of the X, Y, and Z tristimulus of the color calibration target data are represented as follows: , , ) indicates the target duty cycle of PWM; Step 8: The target PWM duty cycle is solidified into the ambient light fixture program, and the PWM duty cycle is replaced. Then the program is burned once. The controller (X1) controls the LED driver (U1) to drive K ambient light fixtures to complete the secondary color calibration. Step 9: Turn on the K ambient lights after the second color calibration, and use a spectrometer to measure the color coordinates and luminous flux of each of the K ambient lights after color calibration. Then compare the color coordinates and luminous flux with the customer's standard color coordinates and luminous flux. If the deviations of the x and y coordinates of the calibrated color coordinates from the customer's standard color coordinates are both within ±0.02, and the deviations of the luminous flux values ​​of the calibrated color coordinates from the customer's standard luminous flux values ​​are both within ±10%, then the calibration is successful; otherwise, the calibration fails, and the process returns to step 2.

2. The method for calibrating and mixing user colors for ambient lighting according to claim 1, characterized in that: In step 3, the formula for calculating the PWM duty cycle is as follows: ； ； ； ； ； ； ； ； ； ； ； ； ； in,( , , The X, Y, and Z tristimulus values ​​represent the target color. [(LED_R_X, LED_R_Y, LED_R_Z), (LED_G_X, LED_G_Y, LED_G_Z), (LED_B_X, LED_B_Y, LED_B_Z)] represents the combination of X, Y, and Z tristimulus values ​​from the red, green, and blue channels of the color calibration data. , , ) indicates the PWM duty cycle.

3. The method for calibrating and mixing user colors for ambient lighting according to claim 1, characterized in that: The lighting fixtures mentioned are: IP ambient lighting fixtures; door panel ambient lighting fixtures; roof ambient lighting fixtures; A-pillar ambient lighting fixtures; or B-pillar ambient lighting fixtures.

4. The method for calibrating and mixing user colors for ambient lighting according to claim 1, characterized in that: The spectrometer is an integrating sphere; or an imaging colorimeter; or an illuminometer.

5. The method for calibrating and mixing user colors for ambient lighting according to claim 3, characterized in that: The driving circuit of the A-pillar ambient light fixture consists of a controller (X1), an LED driver (U1), three RGB LED beads, a resistor R1, a capacitor C1, a capacitor C2, a capacitor C3, a capacitor C4, a capacitor C5, a capacitor C6, a diode D1, a bidirectional diode D2, and a ferrite bead L1. The output terminal of the controller (X1) is connected to the input terminal of the LED driver (U1) via the magnetic bead L1. The output terminal of the controller (X1) is also connected to ground via a bidirectional diode D2. The input terminal of the LED driver (U1) is also connected to ground via a capacitor C5. The input terminal of the controller (X1) is connected to the output terminal of the LED driver (U1), and the input terminal of the controller (X1) is also grounded after being connected in series with capacitor C6; The power supply terminal of the controller (X1) is connected in series with diode D1 and then connected to the front end of resistor R1. The power supply terminal of the controller (X1) is also connected in series with capacitor C3 and capacitor C4 and then grounded. The rear end of resistor R1 is connected to the power supply. The rear end of resistor R1 is also connected in series with capacitor C2 and then grounded. The grounding terminal of the controller (X1) is grounded. The three LED control terminals HV0, HV1 and HV2 of the LED driver (U1) are connected to the cathodes of the three RGB LED beads respectively; the power supply terminal of the LED driver (U1) is connected to the power supply, and the ground terminal of the LED driver (U1) is grounded.

6. The method for calibrating and mixing user colors for ambient lighting according to claim 5, characterized in that: The LED driver (U1) is specifically an MLX81108 chip.

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