Variable color temperature backlight control method and related equipment for LCD panel testing

Abstract

This invention discloses a variable color temperature backlight control method and related equipment for testing liquid crystal panels, comprising the following steps: obtaining color filter parameters of the color filter on the liquid crystal panel to be tested; determining the target color temperature adjustment range of the liquid crystal panel to be tested based on the color filter parameters and preset color temperature matching conditions; identifying two configured LED light sources with different fixed color temperatures, and associating them as a first LED light source and a second LED light source, respectively; performing extreme color temperature calibration operations on the first LED light source and the second LED light source based on the target color temperature adjustment range, respectively, to obtain a first reference current of the first LED light source and a second reference current of the second LED light source; and performing a dynamic adjustment operation on the current ratio of the first LED light source and the second LED light source based on the first reference current, the second reference current, and the preset target color temperature, so as to switch to any target color temperature within the target color temperature adjustment range.

Description

Technical Field

[0001] This invention belongs to the field of screen testing technology, and relates to a variable color temperature backlight control method and related equipment for testing liquid crystal panels. Background Technology

[0002] In LCD panel testing, the accuracy of backlight color temperature control directly determines the accuracy of the panel's color performance test results and is a crucial factor in ensuring the reliability of test data. Existing variable color temperature backlight control methods have significant limitations when applied to LCD panel testing: some solutions rely on multi-color temperature LED combinations with level-based switching to achieve color temperature adjustment. This method struggles to cover all test points within the target color temperature range, resulting in significant test blind spots and failing to meet the demands of refined testing. Other solutions attempt to simplify hardware configurations to reduce costs, but they only control color temperature by preset fixed hardware parameters, completely disregarding the differences in color filter characteristics among different LCD panels. Different color filters have different pigment types and transmittance curves, resulting in varying degrees of attenuation for different wavelengths of light. This directly leads to deviations in the actual color performance of different color filter panels under the same color temperature backlight illumination. Furthermore, existing methods lack targeted adaptation logic, resulting in insufficient color temperature adjustment accuracy and an inability to accurately reflect the true color performance of LCD panels under different color temperature environments. In summary, existing technologies cannot achieve continuous and precise switching of any color temperature within the target color temperature range while adapting to the characteristics of the color filter in the LCD panel, which seriously affects the accuracy and reliability of LCD panel color performance testing. Summary of the Invention

[0003] This application provides a variable color temperature backlight control method and related equipment for testing LCD panels. By acquiring the color filter parameters of the LCD panel under test to determine the appropriate target color temperature adjustment range, performing extreme color temperature calibration on two LED light sources with different fixed color temperatures to obtain a reference current, and then dynamically adjusting the current ratio of the two LED light sources based on the reference current and the preset target color temperature, continuous switching of any color temperature within the target color temperature adjustment range is achieved. Ultimately, this achieves the goal of adapting to different color filter characteristics, improving the accuracy and efficiency of LCD panel color performance testing, and eliminating the need for complex hardware support.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] A variable color temperature backlight control method for testing liquid crystal panels includes the following steps:

[0006] Obtain the color filter parameters on the LCD panel to be tested;

[0007] Based on the color filter parameters and preset color temperature matching conditions, the target color temperature adjustment range of the LCD panel under test is determined.

[0008] Identify two configured LED light sources with different fixed color temperatures and associate them as the first LED light source and the second LED light source, respectively;

[0009] Based on the target color temperature adjustment range, extreme color temperature calibration operations are performed on the first LED light source and the second LED light source respectively to obtain the first reference current of the first LED light source and the second reference current of the second LED light source.

[0010] Based on the first reference current, the second reference current, and the preset target color temperature, the current ratio of the first LED light source and the second LED light source is dynamically adjusted so that the LCD panel under test can be switched to any target color temperature within the target color temperature adjustment range.

[0011] Furthermore, the color filter parameters include the color filter pigment type, the transmittance curve of the first color temperature range, and the transmittance curve of the second color temperature range, wherein the color temperature range of the first color temperature range is higher than that of the second color temperature range.

[0012] The step of determining the target color temperature adjustment range of the LCD panel under test based on the color filter parameters and preset color temperature matching conditions includes:

[0013] Based on the transmittance curve of the first color temperature range, the transmittance attenuation rate of the first color temperature range is determined. If the transmittance attenuation rate of the first color temperature range is lower than the preset first attenuation threshold, the color film pigment type is determined to be the first type of color film, and the target color temperature adjustment range is determined from the preset color temperature range library as the first matching range for the first type of color film.

[0014] Based on the transmittance curve of the second color temperature range, the transmittance attenuation rate of the second color temperature range is determined. If the transmittance attenuation rate of the second color temperature range is lower than the first attenuation threshold, the color film pigment type is determined to be the second type of color film, and the target color temperature adjustment range is determined from the preset color temperature range library as the second adaptation range for the second type of color film.

[0015] If the transmittance attenuation rate of the first color temperature range and the transmittance attenuation rate of the second color temperature range are between the first attenuation threshold and the preset second attenuation threshold, then the target color temperature adjustment range is determined to be a full adaptation range covering the first adaptation range and the second adaptation range.

[0016] Furthermore, the step of performing extreme color temperature calibration operations on the first LED light source and the second LED light source based on the target color temperature adjustment range to obtain the first reference current of the first LED light source and the second reference current of the second LED light source includes:

[0017] The low color temperature endpoint of the target color temperature adjustment range is defined as the first characteristic color temperature, and the high color temperature endpoint of the target color temperature adjustment range is defined as the second characteristic color temperature.

[0018] Adjust the power supply current of the first LED light source to make the actual color temperature of the first LED light source closer to the first characteristic color temperature, until the actual color temperature of the first LED light source meets the preset stability condition.

[0019] Adjust the power supply current of the second LED light source to make the actual color temperature of the second LED light source closer to the second characteristic color temperature, until the actual color temperature of the second LED light source meets the preset stability condition;

[0020] When the actual color temperatures of the first LED light source and the second LED light source both meet the preset stability conditions, the current supply current of the first LED light source is determined as the first reference current, and the current supply current of the second LED light source is determined as the second reference current.

[0021] Furthermore, the step of dynamically adjusting the current ratio of the first LED light source and the second LED light source based on the first reference current, the second reference current, and the preset target color temperature, to switch to any target color temperature within the target color temperature adjustment range, includes:

[0022] The first LED light source is connected to the first reference current, and the second LED light source is connected to the second reference current, so that the LCD panel under test is in the initial mixed color temperature state;

[0023] Obtain the initial mixed color temperature, determine the deviation between the initial mixed color temperature and the preset target color temperature, and determine the direction of color temperature adjustment;

[0024] Based on the color temperature adjustment direction, the first reference current or the second reference current is determined as the target current; based on the color temperature adjustment direction, the current ratio is adjusted on the target current to obtain the current mixed color temperature and the current change trend of the current mixed color temperature approaching the target value; based on the current change trend, the current ratio adjustment is continued until the current mixed color temperature reaches the preset target color temperature.

[0025] Further, the step of determining the first reference current or the second reference current as the target current based on the color temperature adjustment direction; performing current ratio adjustment on the target current based on the color temperature adjustment direction to obtain the current mixed color temperature and the current change trend of the current mixed color temperature approaching the target value; and continuing to perform the current ratio adjustment based on the current change trend until the current mixed color temperature reaches the preset target color temperature, includes:

[0026] When the color temperature adjustment direction is the high color temperature direction, the second reference current is determined as the target current, and the power supply current of the second LED light source is gradually adjusted with a preset current step size to obtain the current change trend of the second LED light source current;

[0027] Based on the current change trend of the second LED light source current, a stabilization time is set so that the second LED light source is in a stable light-emitting state;

[0028] The current mixed color temperature of the liquid crystal panel under test is obtained when it is in a stable light-emitting state. The deviation between the current mixed color temperature and the preset target color temperature is compared to obtain a first deviation judgment result.

[0029] If the first deviation judgment result does not meet the preset deviation requirement, then return to the execution where the color temperature adjustment direction is the high color temperature direction, determine the second reference current as the target current, and gradually adjust the power supply current of the second LED light source with a preset current step size to obtain the current change trend of the second LED light source current until the first deviation judgment result meets the preset deviation requirement.

[0030] Further, the step of determining the first reference current or the second reference current as the target current based on the color temperature adjustment direction; performing current ratio adjustment on the target current based on the color temperature adjustment direction to obtain the current mixed color temperature and the current change trend of the current mixed color temperature approaching the target value; and continuing to perform the current ratio adjustment based on the current change trend until the current mixed color temperature reaches the preset target color temperature, includes:

[0031] When the color temperature adjustment direction is the low color temperature direction, the first reference current is determined as the target current, and the power supply current of the first LED light source is gradually adjusted with a preset current step size to obtain the current change trend of the first LED light source current.

[0032] Based on the current change trend of the first LED light source current, a stabilization time is set so that the first LED light source is in a stable light-emitting state.

[0033] The current mixed color temperature of the LCD panel under test is obtained when it is in a stable light-emitting state. The deviation between the current mixed color temperature and the preset target color temperature is compared to obtain a second deviation judgment result.

[0034] If the second deviation judgment result does not meet the preset deviation requirement, then return to the execution where the color temperature adjustment direction is the low color temperature direction, determine the first reference current as the target current, and gradually adjust the power supply current of the first LED light source with a preset current step size to obtain the current change trend of the first LED light source current.

[0035] A variable color temperature backlight control system for LCD panel testing includes:

[0036] The parameter acquisition module is used to obtain the color filter parameters of the color filter on the LCD panel to be tested.

[0037] The determination module is communicatively connected to the parameter acquisition module and is used to determine the target color temperature adjustment range of the LCD panel to be tested based on the color filter parameters and preset color temperature matching conditions.

[0038] The identification and association module is used to identify two configured LED adjustment module light sources with different fixed color temperatures and associate them as the first adjustment module LED adjustment module light source and the second adjustment module LED adjustment module light source, respectively.

[0039] The calibration module is communicatively connected to the determining module and the adjustment module identification and association module, respectively, and is used to perform extreme color temperature calibration operations on the first adjustment module LED adjustment module light source and the second adjustment module LED adjustment module light source based on the target color temperature adjustment range, to obtain the first reference current of the first adjustment module LED adjustment module light source and the second reference current of the second adjustment module LED adjustment module light source;

[0040] The adjustment module is communicatively connected to the calibration module and the identification association module, respectively, and is used to perform dynamic adjustment operation on the current ratio of the light source of the first adjustment module LED adjustment module and the light source of the second adjustment module LED adjustment module based on the first reference current, the second reference current and the preset target color temperature, so that the LCD panel under test can be switched to any target color temperature within the target color temperature adjustment range.

[0041] A computer device includes a memory and a processor, the memory storing computer-readable instructions, wherein the processor, when executing the computer-readable instructions, implements the steps of the variable color temperature backlight control method for testing liquid crystal panels.

[0042] A computer-readable storage medium storing computer-readable instructions, which, when executed by a processor, implement the steps of the variable color temperature backlight control method for testing a liquid crystal panel as described above.

[0043] The beneficial effects of this invention are as follows: By first obtaining the color filter parameters of the LCD panel to be tested, this invention can accurately match the color filter characteristics to determine the target color temperature adjustment range, solving the test deviation problem caused by the disconnect between color temperature adjustment and color filter pigment type and transmittance curve in the prior art. This allows different color filter panels to be tested within the suitable range without redesigning hardware for each panel, significantly improving the universality of the method. Next, extreme color temperature calibration is performed on two LED light sources with different fixed color temperatures to obtain a reference current, establishing a precise correspondence between current and color temperature, providing a reliable reference for subsequent adjustments, and avoiding errors caused by individual LED differences or hardware fluctuations. Finally, based on the reference current and target color temperature, the current ratio of the two LEDs is dynamically adjusted, utilizing the positive correlation between luminous intensity and current to achieve continuous switching of any color temperature within the target range. This completely eliminates the test blind spots of existing level-based adjustments, and the entire process is quantifiable and reproducible, requiring no complex hardware support. While simplifying configuration and reducing costs, it also considers test accuracy and efficiency, ultimately comprehensively improving the accuracy and practicality of LCD panel color performance testing. Attached Figure Description

[0044] Figure 1 This is an exemplary system architecture diagram to which this application can be applied;

[0045] Figure 2 This is a flowchart of an embodiment of the variable color temperature backlight control method for testing liquid crystal panels according to this application;

[0046] Figure 3 This is a schematic diagram of an embodiment of a variable color temperature backlight control system for testing liquid crystal panels according to this application.

[0047] Figure 4 This is a schematic diagram of the structure of one embodiment of the computer device according to this application. Detailed Implementation

[0048] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains; the terminology used herein in the specification is for the purpose of describing particular embodiments only and is not intended to limit the invention; the terms "comprising" and "having," and any variations thereof, in the specification, claims, and foregoing drawings are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the specification, claims, or foregoing drawings are used to distinguish different objects and not to describe a particular order.

[0049] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of the invention. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0050] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0051] like Figure 1 As shown, the system architecture 100 may include a first terminal device 101, a second terminal device 102, a third terminal device 103, a network 104, and a server 105. The network 104 is used as a medium to provide communication links between the terminal devices 101, 102, 103, and the server 105. The network 104 may include various connection types, such as wired or wireless communication links or fiber optic cables, etc.

[0052] Users can use terminal devices 101, 102, and 103 to interact with server 105 via network 104 to receive or send messages, etc. Various communication client applications can be installed on terminal devices 101, 102, and 103, such as web browser applications, shopping applications, search applications, instant messaging tools, email clients, social media platform software, etc.

[0053] Terminal devices 101, 102, and 103 can be various electronic devices with displays and web browsing capabilities, including but not limited to smartphones, tablets, e-book readers, MP3 (Moving Picture Experts Group Audio Layer III) players, MP4 (Moving Picture Experts Group Audio Layer IV) players, laptops, and desktop computers, etc.

[0054] Server 105 can be a server that provides various services, such as a backend server that supports the pages displayed on terminal devices 101, 102, and 103.

[0055] It should be noted that the variable color temperature backlight control method for testing liquid crystal panels provided in this application is generally executed by the terminal device, and correspondingly, the variable color temperature backlight control system for testing liquid crystal panels is generally set in the terminal device.

[0056] It should be understood that Figure 1 The number of terminal devices, networks, and servers shown is merely illustrative. Depending on implementation needs, any number of terminal devices, networks, and servers can be included.

[0057] Continue to refer to Figure 2 A variable color temperature backlight control method for testing liquid crystal panels includes the following steps:

[0058] S1. Obtain the color filter parameters on the LCD panel to be tested;

[0059] In this embodiment, the color filter parameters are the core parameters affecting light transmission characteristics and final color temperature performance. Their selection is based on the attenuation law of the color filter for different wavelengths of light and is the basis for subsequent color temperature adjustment. Specifically, it includes two core aspects:

[0060] One is the type of color filter pigment. The type of color filter pigment refers to the type of core component used to achieve color filtering in the color filter. Common types include organic dyes (such as azo dyes) and pigment dispersions (such as phthalocyanine pigments). Different types of pigments have different absorption and attenuation characteristics for blue light, green light and other wavelengths.

[0061] Secondly, there is the transmittance curve, which refers to the transmittance curve of the color filter in the visible light band (focusing on 450nm-650nm, which covers the main emission bands corresponding to low color temperature to high color temperature), reflecting the ability of the color filter to transmit light of different wavelengths.

[0062] Furthermore, in this embodiment, the color filter parameters can be obtained by performing full-band transmittance detection on the color filter using a spectrometer to generate transmittance curve data from 450nm to 650nm. At the same time, the product specification sheet of the LCD panel under test or the technical documents provided by the color filter supplier can be consulted to obtain the pigment type information of the color filter, ensuring the accuracy and repeatability of parameter acquisition.

[0063] S2. Based on the color filter parameters and preset color temperature matching conditions, determine the target color temperature adjustment range of the LCD panel to be tested;

[0064] In this embodiment, the preset color temperature matching conditions are rules set based on the light transmittance characteristics of the color filter and used to screen the suitable color temperature range. The core logic is to match the subsequent color temperature adjustment range with the light transmittance characteristics of the color filter, so as to avoid color temperature distortion caused by excessive attenuation of light in a certain wavelength band by the color filter.

[0065] The target color temperature adjustment range refers to the specific range within which continuous color temperature switching can be achieved. The setting of this range must ensure that the color film can transmit light normally at any color temperature within the range, so that the panel color performance test is effective.

[0066] Furthermore, in this embodiment, the transmittance attenuation rate of the color filter in the high color temperature range (corresponding to the 450nm blue light band) and the low color temperature range (corresponding to the 550nm green light band) is calculated first based on the transmittance curve in the color filter parameters (attenuation rate = (standard transmittance - measured transmittance) / standard transmittance × 100%).

[0067] If the light transmittance attenuation rate in the high color temperature range is less than 10% (first attenuation threshold), it is determined to be a cool-toned color film, and the target color temperature adjustment range is set to 7000K to 10000K;

[0068] If the light transmittance attenuation rate in the low color temperature range is less than 10%, it is judged as a warm-toned color film, and the target color temperature adjustment range is set to 6000K to 8000K;

[0069] If both attenuation rates are between 10% and 20% (the second attenuation threshold), it is determined to be a general-purpose color filter, and the target color temperature adjustment range is set to 6000K to 10000K to achieve full range coverage.

[0070] S3. Identify the two configured LED light sources with different fixed color temperatures and associate them as the first LED light source and the second LED light source, respectively;

[0071] In this embodiment, the two LED light sources with different fixed color temperatures are pre-configured in the backlight system and have a fixed emission color temperature. There is no need for additional multi-color temperature adjustment functions. The mixed color temperature change can be achieved simply by adjusting the current to change the luminous intensity, which simplifies the hardware configuration.

[0072] The first LED light source is associated with the LED light source corresponding to the low color temperature end of the target color temperature adjustment range. In this embodiment, an LED with a fixed color temperature of 6000K is selected (to meet the calibration requirements of the low color temperature end).

[0073] The second LED light source is associated with the LED light source corresponding to the high color temperature end of the target color temperature adjustment range. In this embodiment, an LED with a fixed color temperature of 10000K is selected (to meet the calibration requirements of the high color temperature end).

[0074] S4. Based on the target color temperature adjustment range, perform extreme color temperature calibration operations on the first LED light source and the second LED light source respectively to obtain the first reference current of the first LED light source and the second reference current of the second LED light source;

[0075] In this embodiment, the extreme color temperature calibration operation refers to the operation of using the two endpoints (extreme color temperatures) of the target color temperature adjustment range as calibration targets, and finely adjusting the power supply current of the LED light source to make the actual emitting color temperature of the LED stably match the color temperature of the corresponding endpoints. The purpose is to establish a precise correspondence between "current and color temperature" to provide a benchmark for subsequent mixing adjustment.

[0076] The first reference current is the supply current when the first LED light source is emitting stable light at the low color temperature end of the target range, and the second reference current is the supply current when the second LED light source is emitting stable light at the high color temperature end of the target range. Both are the basic reference values ​​for subsequent current ratio adjustment.

[0077] Furthermore, in this embodiment, the core process of extreme color temperature calibration is to first determine the calibration target, define the low color temperature endpoint of the target color temperature adjustment range as the first characteristic color temperature, and define the high color temperature endpoint as the second characteristic color temperature. Then, power the first LED light source separately, and gradually fine-tune the power supply current to stabilize the measured color temperature within the allowable deviation range of the first characteristic color temperature. Using the same calibration logic as the first LED light source, power the second LED light source separately and fine-tune the current to stabilize it within the allowable deviation range of the second characteristic color temperature. Record the power supply current at this time, which are the first reference current and the second reference current.

[0078] S5. Based on the first reference current, the second reference current and the preset target color temperature, perform dynamic adjustment operation on the current ratio of the first LED light source and the second LED light source, so that the LCD panel under test can be switched to any target color temperature within the target color temperature adjustment range.

[0079] In this embodiment, the preset target color temperature refers to the specific color temperature point required during the testing of the liquid crystal panel. This color temperature point must be within the target color temperature adjustment range determined in step S2, such as any value like 6500K, 8300K, or 9500K.

[0080] The dynamic adjustment of the current ratio is based on the positive correlation between the luminous intensity and current of the two LED light sources. By changing the ratio of the supply current of the two, the operation of continuous change of mixed color temperature can be achieved. Its core logic is that the ratio of the luminous intensity of the two LEDs determines the mixed color temperature. By fixing the reference current of one light source and adjusting the current of the other light source, the ratio can be changed and the color temperature can be switched.

[0081] In this embodiment, an initial state setting is first performed, that is, the first LED light source is connected to the first reference current and the second LED light source is connected to the second reference current simultaneously. At this time, the luminous intensity of the two light sources is balanced, forming an initial mixed color temperature. Then, the initial mixed color temperature is compared with the preset target color temperature to determine the color temperature adjustment direction (towards a lower color temperature or towards a higher color temperature). According to the adjustment direction, the reference current of one of the LED light sources is kept unchanged (to stabilize the luminous intensity at the corresponding color temperature end), and the power supply current of the other LED light source is adjusted with a set step size to change the current ratio between the two. After each adjustment, a preset stabilization time is maintained. After the luminous state is stabilized, the mixed color temperature of the LCD panel under test is detected and obtained. The adjustment is repeated until the mixed color temperature is stabilized within the allowable deviation range of the preset target color temperature, thus completing the switching of the target color temperature.

[0082] In this embodiment, through the above steps, continuous and precise switching of any target color temperature can be achieved within the target color temperature adjustment range, meeting the requirements of LCD panel color performance testing. Moreover, all operational details are clearly defined, and those skilled in the art can directly implement them based on the above description.

[0083] The color filter parameters include the color filter pigment type, the transmittance curve of the first color temperature band, and the transmittance curve of the second color temperature band, wherein the color temperature range of the first color temperature band is higher than that of the second color temperature band.

[0084] In this embodiment, the color filter pigment type is the core functional component type used in the color filter to achieve color filtering and selective light transmission. It directly affects the absorption and attenuation characteristics of the color filter for different wavelengths of light. Color filter pigment types are divided into organic dye type and pigment dispersion type. Organic dye type is commonly found in mid-to-high-end panels (such as color filters for mobile phones and displays, e.g., azo red dyes and anthraquinone blue dyes), while pigment dispersion type is more common in industrial-grade or high-weather-resistant panels (such as outdoor display panels, e.g., phthalocyanine blue pigment and iron oxide red pigment).

[0085] Secondly, there are the transmittance curves corresponding to the first and second color temperature ranges, respectively. The first color temperature range refers to the high color temperature range, and the second color temperature range refers to the low color temperature range. The color temperature range of both is directly tied to the sensitive wavelength of the color filter. The first color temperature range is 8000K to 10000K, corresponding to the 450nm to 480nm blue light band in the visible light spectrum (this wavelength of light dominates at high color temperatures, and the degree of attenuation by the color filter directly affects the accuracy of high color temperature tests). The second color temperature range is 6000K to 8000K, corresponding to the 530nm to 570nm green light band in the visible light spectrum (this wavelength of light dominates at low color temperatures, and the difference in attenuation is the main reason for the deviation in low color temperature tests).

[0086] As an extension, the transmittance curve can be obtained by acquiring data calculated by other devices, or a UV-Vis spectrophotometer can be used to test the transmittance data of the color filter in the 450nm to 480nm and 530nm to 570nm bands in a 1nm step size under a 25°C room temperature and no strong light interference environment. Finally, two continuous curves are generated (the horizontal axis is wavelength and the vertical axis is transmittance), ensuring that the data covers all sensitive bands of the two color temperature ranges.

[0087] The step of determining the target color temperature adjustment range of the LCD panel under test based on the color filter parameters and preset color temperature matching conditions includes:

[0088] Based on the transmittance curve of the first color temperature range, the transmittance attenuation rate of the first color temperature range is determined. If the transmittance attenuation rate of the first color temperature range is lower than the preset first attenuation threshold, the color film pigment type is determined to be the first type of color film, and the target color temperature adjustment range is determined from the preset color temperature range library as the first matching range for the first type of color film.

[0089] Based on the transmittance curve of the second color temperature range, the transmittance attenuation rate of the second color temperature range is determined. If the transmittance attenuation rate of the second color temperature range is lower than the first attenuation threshold, the color film pigment type is determined to be the second type of color film, and the target color temperature adjustment range is determined from the preset color temperature range library as the second adaptation range for the second type of color film.

[0090] If the transmittance attenuation rate of the first color temperature range and the transmittance attenuation rate of the second color temperature range are between the first attenuation threshold and the preset second attenuation threshold, then the target color temperature adjustment range is determined to be a full adaptation range covering the first adaptation range and the second adaptation range.

[0091] In this embodiment, the first step is to calculate the transmittance attenuation rate for the first and second color temperature bands. The core formula for calculating the transmittance attenuation rate is: Transmittance attenuation rate η = (Standard transmittance T0 - Measured transmittance T1) / Standard transmittance T0 × 100%. Here, the standard transmittance T0 is the benchmark value set by the color filter manufacturer for qualified products (not 100% of an ideal state). For example, the T0 for organic dye-type color filters at 450nm is typically 85%, and for pigment-dispersed color filters at 550nm is typically 80%. The measured transmittance T1 is the average transmittance of the transmittance curves in the aforementioned steps (to avoid the randomness of data from a single wavelength). The calculation requires taking the transmittance values ​​of all test wavelengths within the corresponding band and calculating the arithmetic mean.

[0092] Taking a certain organic dye-based color filter as an example: When calculating the attenuation rate in the first color temperature range (450nm to 480nm), the transmittance of 31 wavelength points (450nm, 451nm…480nm) within this range is first extracted from the spectrophotometer test data, and the average value T1 is calculated to be 78.2%. Given that the standard transmittance of this type of color filter is T0 = 85%, substituting these values ​​into the formula yields η = (85-78.2) / 85×100% = 8%. Similarly, when calculating the attenuation rate in the second color temperature range (530nm to 570nm), the average transmittance of 41 wavelength points is taken as T1 = 72%, and the standard transmittance as T0 = 80%, resulting in η = (80-72) / 80×100% = 10%. This calculation method converts the transmittance characteristics of the color filter into quantitative data, providing an objective basis for subsequent range determination.

[0093] In this embodiment, the preset color temperature matching conditions are based on the comparison rules of attenuation rate and threshold, and the preset color temperature range library is a set of pre-stored adaptation ranges. The two together determine the target color temperature adjustment range, and this embodiment transforms them into an operational standard that can be directly called. First, the preset thresholds are defined: the first attenuation threshold is 10% (used to distinguish whether the color filter is "biased to a certain color temperature type"), and the second attenuation threshold is 20% (used to determine whether full range coverage is required). These two thresholds are determined based on a large amount of color filter test data. When the attenuation rate is <10%, the color filter has good transmittance of light in that wavelength band and is suitable for testing in the corresponding color temperature range; when the attenuation rate is between 10% and 20%, the attenuation of the color filter for both wavelength bands is within an acceptable range and can cover the entire range.

[0094] Secondly, there is a preset color temperature range library, stored as a parameter table in the local database of the test control software. It contains three matching ranges corresponding one-to-one with the color filter pigment type: the first matching range is 7000K to 10000K (suitable for type 1 color filters, i.e., cool-toned color filters), the second matching range is 6000K to 8000K (suitable for type 2 color filters, i.e., warm-toned color filters), and the full matching range is 6000K to 10000K (suitable for general-purpose color filters). Calling the range library does not require on-site calculation; it automatically matches based on the color filter pigment type determination result, ensuring operational efficiency.

[0095] Based on the attenuation rate data from the preceding steps and the matching conditions in step 3, the final target color temperature adjustment range can be determined. This embodiment illustrates the complete process through three typical scenarios, covering all possible situations, wherein:

[0096] Scenario 1 is determined to be a Type 1 color filter (cool-toned color filter). The first adaptation range is determined. When the transmittance attenuation rate of the first color temperature band is less than the first attenuation threshold (10%), it indicates that the color filter has relatively low attenuation in the sensitive wavelength range of high color temperatures, making it suitable for testing in the high color temperature range. Taking a cool-toned color filter as an example: the calculated attenuation rate of the first color temperature band (450nm to 480nm) is 4% < 10%, and the attenuation rate of the second color temperature band (530nm to 570nm) is 12%. At this point, it is determined to be a Type 1 color filter. The control software automatically retrieves the first adaptation range 7000K to 10000K from the range library as the target color temperature adjustment range for this LCD panel.

[0097] Scenario 2 is determined to be a type II color filter (warm-toned color filter). A second adaptation range is established. When the transmittance attenuation rate of the second color temperature band is less than the first attenuation threshold (10%), it indicates that the color filter has relatively low attenuation in the sensitive wavelength range of low color temperatures, making it suitable for testing in the low color temperature range. Taking a warm-toned color filter as an example: the calculated attenuation rate of the second color temperature band (530nm to 570nm) is 6% < 10%, and the attenuation rate of the first color temperature band (450nm to 480nm) is 15%. Therefore, it is determined to be a type II color filter, and the second adaptation range of 6000K to 8000K is used as the target adjustment range.

[0098] Scenario 3 is determined to be a general-purpose color filter. The full adaptation range is established. When the transmittance attenuation rate of both the first and second color temperature bands is between the first attenuation threshold (10%) and the second attenuation threshold (20%), it indicates that the attenuation of the color filter for both color temperature bands is within an acceptable range, and there is no need to limit it to a single range. Taking a certain general-purpose color filter as an example: the calculated attenuation rate for the first color temperature band is 14%, and the attenuation rate for the second color temperature band is 14%, both between 10% and 20%. At this point, it is determined to be a general-purpose color filter. The full adaptation range of 6000K to 10000K is then used to achieve full range coverage testing.

[0099] The step of performing extreme color temperature calibration operations on the first LED light source and the second LED light source based on the target color temperature adjustment range to obtain the first reference current of the first LED light source and the second reference current of the second LED light source includes:

[0100] The low color temperature endpoint of the target color temperature adjustment range is defined as the first characteristic color temperature, and the high color temperature endpoint of the target color temperature adjustment range is defined as the second characteristic color temperature.

[0101] Adjust the power supply current of the first LED light source to make the actual color temperature of the first LED light source closer to the first characteristic color temperature, until the actual color temperature of the first LED light source meets the preset stability condition.

[0102] Adjust the power supply current of the second LED light source to make the actual color temperature of the second LED light source closer to the second characteristic color temperature, until the actual color temperature of the second LED light source meets the preset stability condition;

[0103] When the actual color temperatures of the first LED light source and the second LED light source both meet the preset stability conditions, the current supply current of the first LED light source is determined as the first reference current, and the current supply current of the second LED light source is determined as the second reference current.

[0104] In this embodiment, the first characteristic color temperature refers to the low color temperature end of the target color temperature adjustment range, that is, the standard color temperature value that the first LED light source (the LED associated with the low color temperature end) needs to be calibrated to; the second characteristic color temperature refers to the high color temperature end of the target color temperature adjustment range, that is, the standard color temperature value that the second LED light source (the LED associated with the high color temperature end) needs to be calibrated to.

[0105] The following is an example of a scenario:

[0106] If the target range is determined to be "the first adaptation range 7000K~10000K" (cool-toned color film), then the first characteristic color temperature = 7000K and the second characteristic color temperature = 10000K;

[0107] If the target range is "second adaptation range 6000K~8000K" (warm color film), then the first characteristic color temperature = 6000K and the second characteristic color temperature = 8000K;

[0108] If the target range is "full-adaptation range 6000K~10000K" (general color filter), then the first characteristic color temperature = 6000K and the second characteristic color temperature = 10000K (this embodiment takes the full-adaptation range as an example. Other scenarios only need to replace the endpoint values, and the operation logic is completely the same).

[0109] It should be noted that the preset stability condition in this embodiment can be "the actual color temperature values ​​of the LED collected in 3 consecutive tests are all stable within the range of ±5K of the corresponding characteristic color temperature" (if higher accuracy is required, the deviation range can be reduced to ±2K, in which case the current adjustment step size needs to be reduced). This condition can be achieved through the continuous detection function of the color temperature meter to avoid the random error of a single test.

[0110] The next step is to calibrate the first LED light source to approach the first characteristic color temperature. The first LED light source is an LED associated with the low color temperature end. The calibration goal is to stabilize its actual color temperature at the first characteristic color temperature (6000K, the lower end of the full adaptation range). Specific operations require an adjustable DC power supply (accuracy ≥ 0.01A) and a color temperature meter (accuracy ≥ ±10K, which must be aimed at the center area of ​​the backlight during testing). The steps are as follows: Connect only the adjustable DC power supply to the first LED light source (disconnect the power supply circuit of the second LED light source to avoid mutual interference). Set the initial power supply current according to the rated power of the first LED light source: if the rated power of the LED is 2W (rated voltage 3V), then set the initial current to 1A (default value, calculated by the formula "initial current = rated power / rated voltage", which can be adjusted flexibly to avoid the initial current exceeding the rated value); if the rated power is 3W (3V), the initial current can be set to 0.8A to ensure a safe and stable initial light emission state; wait for the first... After the LED light source emits light for 10 seconds (to allow the light source to enter a stable working state), its actual color temperature value is collected using a color temperature meter. If the reading is greater than the first characteristic color temperature (e.g., measured 6200K > 6000K), the output current of the adjustable DC power supply is reduced in steps of 0.05A (a 3-second stabilization period is required after each adjustment to ensure the LED's light-emitting characteristics are stable), and the color temperature is collected again. If the reading is less than the first characteristic color temperature (e.g., measured 5800K < 6000K), the current is increased in steps of 0.05A, and the "adjustment-stabilization-detection" process is repeated. When the actual color temperature values ​​collected for three consecutive times all fall within the range of 6000K ± 5K (e.g., 6002K, 5998K, 6001K), it indicates that the "current-color temperature" relationship of the first LED light source has been locked. At this time, the current output current of the adjustable DC power supply is immediately recorded. This current is the "first reference current" (in this embodiment, the measured value is 1.02A; the specific value may vary slightly due to individual LED differences, which is normal).

[0111] Similarly, calibration is performed on the second LED light source to approach the second characteristic color temperature. The second LED light source is an LED associated with the high color temperature end (such as the 10000K fixed color temperature LED mentioned above). The calibration goal is to stabilize its actual color temperature at the second characteristic color temperature (10000K, the high end of the full adaptation range). The operation logic is completely symmetrical with that of the first LED light source, only requiring the replacement of the "characteristic color temperature" and "LED light source". The specific steps are as follows: Disconnect the power supply circuit of the first LED light source, and connect only the second LED light source to an adjustable DC power supply. Set the initial current according to its rated power: If the rated power of the second LED light source is also 2W (3V), then the initial current is the same as that of the first LED light source, set to 1A (to ensure a unified calibration benchmark). To reduce errors in subsequent mixing and adjustment); after the second LED light source has been emitting light for 10 seconds and stabilized, the actual color temperature value is collected using the same color temperature meter (to avoid system errors from different devices). If the reading is >10000K (e.g., 10200K), the current is reduced in steps of 0.05A, and the reading is stabilized for 3 seconds after each adjustment before being measured again; if the reading is <10000K (e.g., 9800K), the current is increased in steps of 0.05A, and the cycle is repeated; when the actual color temperature value collected for three consecutive times is stable within the range of 10000K±5K (e.g., 10003K, 9997K, 10001K), the adjustment is stopped, and the output current of the adjustable DC power supply at this time is recorded. This current is the "second reference current" (measured as 0.98A in this embodiment).

[0112] After calibrating the first and second LED light sources, the first reference current (1.02A) and the second reference current (0.98A) need to be stored in the control software of the test system or the local database.

[0113] The step of dynamically adjusting the current ratio of the first LED light source and the second LED light source based on the first reference current, the second reference current, and a preset target color temperature, to switch to any target color temperature within the target color temperature adjustment range, includes:

[0114] The first LED light source is connected to the first reference current, and the second LED light source is connected to the second reference current, so that the LCD panel under test is in the initial mixed color temperature state;

[0115] Obtain the initial mixed color temperature, determine the deviation between the initial mixed color temperature and the preset target color temperature, and determine the direction of color temperature adjustment;

[0116] Based on the color temperature adjustment direction, the first reference current or the second reference current is determined as the target current. The target current is adjusted by a current ratio to obtain the current mixed color temperature and the current change trend of the current mixed color temperature approaching the target value. Based on the current change trend, the current ratio adjustment is continued until the current mixed color temperature reaches the preset target color temperature.

[0117] In this embodiment, the core objective is to enable two LED light sources to emit light simultaneously from a "calibrated reference state," forming an "initial starting point" for adjustment. The specific operation requires an adjustable DC power supply (supporting dual independent outputs) and a backlight testing bracket. The steps are as follows: Connect the first LED light source (low color temperature associated LED, 6000K fixed color temperature) to the first output channel of the adjustable DC power supply, and set the channel output current to the first reference current of 1.02A. Connect the second LED light source (high color temperature associated LED, 10000K fixed color temperature) to the second output channel of the power supply, and set the output current to the second reference current of 0.98A. Simultaneously connect both power supplies (ensuring synchronous emission of the two LEDs). To avoid color temperature fluctuations caused by starting up in sequence); after both LED light sources emit light simultaneously for 10 seconds (allowing both the light source and the panel color film to enter a stable response state), observe the backlight performance of the LCD panel under test: at this time, the power supply current of both LEDs is the reference value. Since "LED luminous intensity is positively correlated with current (within the rated current range)", and the reference current is the stable current of each corresponding characteristic color temperature, the luminous intensity of the two light sources is basically the same. The theoretical value of the mixed color temperature is (first characteristic color temperature + second characteristic color temperature) / 2 = (6000K + 10000K) / 2 = 8000K. This state is the "initial mixed color temperature state". All subsequent adjustments are based on this state and there is no need to re-establish the starting point.

[0118] Following the above steps, this embodiment uses a color temperature meter to collect the actual color temperature value under the initial mixing state. In this embodiment, the measured example value is 8002K (close to the theoretical value of 8000K, a deviation of ≤±5K is normal, as individual LED luminous efficiency varies slightly). This value is recorded as the "starting color temperature" for adjustment. The measured value needs to be compared with the preset target color temperature. The target value needs to be within the defined "full adaptation range of 6000K~10000K". This embodiment selects two typical target values ​​to cover different adjustment directions: one is a target value of 6500K for the low color temperature direction (requiring a reduction in the mixed color temperature); the other is a target value of 9000K for the high color temperature direction (requiring an increase in the mixed color temperature). The target value can be flexibly set according to testing needs (such as 7200K, 8800K, etc., with completely consistent operating logic).

[0119] Finally, calculate the deviation and determine the adjustment direction:

[0120] When the target value is 6500K, the deviation between the initial mixed color temperature of 8002K and the target value is 8002K-6500K=1500K (initial value>target value). Therefore, the "color temperature adjustment direction" is towards the lower color temperature (closer to the 6000K end).

[0121] When the target value is 9000K, the deviation is 9000K-8002K=998K (initial value < target value). Therefore, the "color temperature adjustment direction" is towards higher color temperature (closer to the 10000K end). The deviation calculation does not need to be accurate to the unit. It is only necessary to determine whether the "initial value is higher or lower than the target value" to determine the direction, avoiding complicated calculations.

[0122] In this embodiment, the adjustment is made towards a lower color temperature (target 6500K). This direction requires increasing the proportion of luminous intensity of the first LED light source at the low color temperature end. Therefore, the current of the first LED light source is kept constant at the first reference current of 1.02A (to stabilize the intensity at the low color temperature end). Only the current of the second LED light source is adjusted. The specific operation is as follows: According to the color temperature control accuracy requirements, 0.02A is selected as the adjustment step size (the smaller the step size, the higher the accuracy: a step size of 0.02A can achieve ±3K accuracy, a step size of 0.01A can achieve ±2K accuracy. In this embodiment, 0.02A is selected to balance accuracy and efficiency). The "gradually reduce current" operation is performed through the second channel of the adjustable DC power supply (connected to the second LED light source) (the current of the second LED light source decreases → its luminous intensity decreases → the proportion of low color temperature light increases → the mixed color temperature decreases). Each time the current of the second LED light source is reduced by 0.02A, a stabilization period of 3 seconds is maintained (to ensure that the LED's light-emitting characteristics and the light transmission state of the panel's color film remain stable). The current mixed color temperature is then measured using a color temperature meter. After the initial adjustment, the current of the second LED is 0.96A, and the measured mixed color temperature is 7920K (still higher than 6500K). The current is further reduced to 0.94A, and the measured temperature is 7840K. This process is repeated until the current of the second LED is reduced to 0.4A, at which point the measured mixed color temperature is 6503K. At this point, the "current change trend" is recorded: as the current of the second LED gradually decreases from 0.98A to 0.4A, the mixed color temperature gradually decreases from 8002K to 6503K, showing a stable trend of "current decreasing → color temperature decreasing," and the trend continues to approach the target value of 6500K. When the current mixed color temperature is consistently within the range of 6500K±5K (e.g., 6503K, 6498K, 6501K) after three consecutive measurements, stop adjusting and lock the current current parameters: first LED current 1.02A (reference value unchanged), second LED current 0.4A. At this point, the mixed color temperature has been successfully switched to the target value of 6500K.

[0123] In this example, the adjustment is directed towards a higher color temperature (target 9000K). This direction requires increasing the luminous intensity ratio of the second LED light source at the high color temperature end. Therefore, the current of the second LED light source is kept constant at the second reference current of 0.98A (to stabilize the intensity at the high color temperature end). Only the current of the first LED light source is adjusted. The specific operation is as follows: First, using the same adjustment step size of 0.02A, the "gradually decrease current" operation is performed through the first channel of the adjustable DC power supply (connected to the first LED light source) (the current of the first LED light source decreases → its luminous intensity decreases → the proportion of high color temperature light increases → the mixed color temperature increases). After each reduction of the current of the first LED light source by 0.02A, a stabilization time of 3 seconds is maintained, and the current mixed color temperature is collected. After the first adjustment, the current of the first LED is 1.00A, and the measured mixed color temperature is 8080K (still low). (At 9000K); continue to decrease to 0.98A, measured at 8160K; repeat the operation until the first LED current decreases to 0.3A, the current mixed color temperature is collected as 8998K, record the "current change trend": as the first LED current gradually decreases from 1.02A to 0.3A, the mixed color temperature gradually increases from 8002K to 8998K, showing a stable trend of "current decreasing → color temperature increasing", and the trend continues to approach the target value of 9000K. When the current mixed color temperature collected for 3 consecutive times is stable within the range of 9000K±5K (such as 8998K, 9002K, 8999K), stop adjusting and lock the current current parameters: first LED current 0.3A, second LED current 0.98A (reference value unchanged), at this time the mixed color temperature is successfully switched to the target value of 9000K.

[0124] The process involves determining either the first reference current or the second reference current as the target current based on the color temperature adjustment direction; performing current ratio adjustment on the target current based on the color temperature adjustment direction to obtain the current mixed color temperature and the current change trend of the current mixed color temperature approaching the target value; and continuing to perform the current ratio adjustment based on the current change trend until the current mixed color temperature reaches the preset target color temperature, including:

[0125] When the color temperature adjustment direction is the high color temperature direction, the second reference current is determined as the target current, and the second reference current is gradually adjusted with a preset current step size to obtain the current change trend of the second LED light source current;

[0126] Based on the current change trend of the second LED light source current, a stabilization time is set so that the second LED light source is in a stable light-emitting state;

[0127] The current mixed color temperature of the liquid crystal panel under test is obtained when it is in a stable light-emitting state. The deviation between the current mixed color temperature and the preset target color temperature is compared to obtain a first deviation judgment result.

[0128] If the first deviation judgment result does not meet the preset deviation requirement, then return to the execution where the color temperature adjustment direction is the high color temperature direction, determine the second reference current as the target current, and gradually adjust the second reference current with a preset current step size to obtain the current change trend of the second LED light source current until the first deviation judgment result meets the preset deviation requirement.

[0129] In this embodiment, the first LED light source is connected to the first channel of the adjustable DC power supply, and the output current is fixed at the first reference current of 1.02A obtained in Embodiment 3. This ensures that the luminous intensity at the low color temperature end is stable and avoids its fluctuations from interfering with the direction of change of the mixed color temperature. The second LED light source is connected to the second channel of the power supply, and the initial output current is set to the second reference current of 0.98A (which is consistent with the current in the initial mixed color temperature state and serves as the starting point for adjustment). At the same time, both power supplies are turned on to ensure that the two LEDs emit light synchronously and avoid instantaneous color temperature deviation caused by starting one after the other. The power supply current of the second LED light source is gradually increased through the second channel of the adjustable DC power supply in increments of 0.02A. (Note: Adjustment in the high color temperature direction requires increasing the proportion of high color temperature light, therefore the current of the second LED must be increased. Incorrectly decreasing the current will lead to a decrease in the mixed color temperature, which contradicts the adjustment direction.) The current value is recorded immediately after each adjustment to form a continuous "current change trend." For example, after the first adjustment, the current of the second LED increases from the initial 0.98A to 1.00A, the second adjustment to 1.02A, the third adjustment to 1.04A, the fourth adjustment to 1.06A, and the fifth adjustment to 1.08A. During the adjustment process, it is necessary to confirm in real time that the current of the second LED does not exceed its rated current. At this time, the current change trend of the second LED light source is clearly presented as "gradually increasing from 0.98A in increments of 0.02A to 1.08A." This trend directly corresponds to the change direction of the mixed color temperature: increasing current → increasing proportion of high color temperature light → increasing mixed color temperature, providing a clear basis for subsequent stable operation and color temperature detection.

[0130] Secondly, since the current of the second LED light source changes in increments of 0.02A, the adjustment range is small each time, and the PN junction temperature fluctuates by only ±1℃, so it can stabilize without a long balancing period. Therefore, the preset 3-second stabilization time is used. If the step size is subsequently increased to 0.1A (to adapt to rapid adjustment scenarios), the stabilization time needs to be extended to 5 seconds to avoid color temperature deviation caused by sudden temperature changes. After each adjustment of the current of the second LED light source (e.g., from 0.98A to 1.00A), the adjustment should be stopped immediately and the current value should be maintained. After 3 seconds, observe the luminous state of the second LED light source. If there is no flickering, no visible change in brightness, and the current display of the adjustable DC power supply shows a real-time current fluctuation of ≤±0.001A, it proves that the power supply output is stable and the second LED light source is in a "stable luminous state". If flickering occurs, check whether the wiring between the power supply and the LED is secure. After eliminating the problem of poor contact, repeat the adjustment and stabilization steps to ensure the validity of subsequent test data.

[0131] After the second LED light source reaches a stable emission state, place the color temperature meter close to the center area of ​​the LCD panel to be tested (maintaining a distance of 5cm from the panel to avoid interference from ambient light reflection), collect and record the mixed color temperature once. For example, when the second LED current is adjusted to 1.00A, the measured mixed color temperature after stabilization is 8950K; when adjusted to 1.02A, the measured color temperature is 9040K; when adjusted to 1.04A, the measured color temperature is 9120K; when adjusted to 1.06A, the measured color temperature is 9180K; and when adjusted to 1.08A, the measured color temperature is 9201K.

[0132] The deviation is calculated using the formula "deviation = |current mixed color temperature - target color temperature|". Combined with the preset deviation requirement, the result is judged. The preset target color temperature is 9200K. When the second LED current is 1.00A, the deviation is |8950K - 9200K| = 250K, which is much greater than 5K, and the deviation judgment result is "not met". When the current is 1.02A, the deviation is |9040K - 9200K| = 160K, still not met. When the current is 1.04A, the deviation is |9120K - 9200K| = 80K, still not met. When the current is 1.06A, the deviation is |9180K - 9200K| = 20K, still not meeting the preset requirement. Finally, when the current is 1.08A, the deviation is |9201K - 9200K| = 1K, which is less than the preset deviation requirement of 5K, and the deviation judgment result is "met".

[0133] In this embodiment, when the second LED current is 1.00A, 1.02A, 1.04A, and 1.06A, the deviation judgment result is "not satisfied" for all of them. It is necessary to return and continue to increase the power supply current of the second LED light source in 0.02A increments. For example, when the current is 1.06A, the deviation is 20K. After returning, the current is adjusted to 1.08A, and the subsequent steps are repeated to ensure that each adjustment is closer to the target color temperature. When the second LED current is 1.08A, the deviation between the current mixed color temperature 9201K and the target value 9200K is 1K≤5K, and the deviation judgment result is "satisfied". The adjustment is stopped immediately, and the output parameters of the two power supplies are locked. The first LED light source current is kept at 1.02A (which remains unchanged to ensure stability at the low color temperature end), and the second LED light source current is locked at 1.08A (the final adjustment value to achieve an increase in the proportion of high color temperature light). To avoid the randomness of a single test, the current mixed color temperature is collected three times consecutively (with a 1-second interval). If the three readings are 9201K, 9199K, and 9200K respectively, all of which meet the requirement of deviation ≤ ±5K, it proves that the adjustment result is stable and there is no risk of fluctuation. It can then proceed to the subsequent LCD panel color data acquisition stage.

[0134] The process involves determining either the first reference current or the second reference current as the target current based on the color temperature adjustment direction; performing current ratio adjustment on the target current based on the color temperature adjustment direction to obtain the current mixed color temperature and the current change trend of the current mixed color temperature approaching the target value; and continuing to perform the current ratio adjustment based on the current change trend until the current mixed color temperature reaches the preset target color temperature, including:

[0135] When the color temperature adjustment direction is the low color temperature direction, the first reference current is determined as the target current, and the first reference current is gradually adjusted with a preset current step size to obtain the current change trend of the first LED light source current.

[0136] Based on the current change trend of the first LED light source current, a stabilization time is set so that the first LED light source is in a stable light-emitting state.

[0137] The current mixed color temperature of the LCD panel under test is obtained when it is in a stable light-emitting state. The deviation between the current mixed color temperature and the preset target color temperature is compared to obtain a second deviation judgment result.

[0138] If the second deviation judgment result does not meet the preset deviation requirement, then return to the execution where the color temperature adjustment direction is the low color temperature direction, determine the first reference current as the target current, and gradually adjust the first reference current with a preset current step size to obtain the current change trend of the first LED light source current.

[0139] In this embodiment, the second LED light source is first connected to the second channel of the adjustable DC power supply, and the output current is fixed at the second reference current of 0.98A obtained in Embodiment 3. This ensures that the luminous intensity at the high color temperature end remains unchanged, allowing the change in mixed color temperature to be completely dominated by the adjustment of the first LED current. The first LED light source is then connected to the first channel of the power supply, and the initial output current is set to the first reference current of 1.02A (consistent with the current at the initial mixed color temperature state, serving as the starting point for adjustment). Both power supplies are simultaneously connected to ensure that the two LEDs emit light synchronously, avoiding instantaneous color temperature deviations caused by sequential startup. The supply current of the first LED light source is gradually increased through the first channel of the adjustable DC power supply in steps of 0.02A. (Note: Adjustment in the low color temperature direction requires increasing the proportion of low color temperature light, therefore the first LED current must be increased. If the current is mistakenly decreased, it will lead to a decrease in the proportion of low color temperature light and a change in the mixed color temperature.) (The color temperature increases, contradicting the adjustment direction); after each adjustment, the current value is recorded immediately to form a continuous "current change trend". For example, after the first adjustment, the first LED current increases from the initial 1.02A to 1.04A, the second adjustment to 1.06A, the third adjustment to 1.08A, the fourth adjustment to 1.10A, and the fifth adjustment to 1.12A. During the adjustment process, it is necessary to confirm in real time that the first LED current does not exceed its rated current (in this embodiment, the first LED rated current is 2A, and 1.12A is within the safe operating range with no risk of overload). At this time, the current change trend of the first LED light source is clearly presented as "gradually increasing from 1.02A in 0.02A steps to 1.12A". This trend directly corresponds to the change direction of the mixed color temperature: current increase → increase in the proportion of low color temperature light → decrease in mixed color temperature, providing a clear basis for subsequent stable operation and color temperature detection.

[0140] Since the current of the first LED light source changes in increments of 0.02A, each current adjustment is small, and the PN junction temperature fluctuation is only ±1℃, stabilization can be achieved without a long balancing period. Therefore, the preset 3-second stabilization time is used. If the step size is subsequently increased to 0.1A (to adapt to rapid adjustment scenarios), the stabilization time needs to be extended to 5 seconds to avoid color temperature deviation caused by sudden temperature changes. After each adjustment of the current of the first LED light source (e.g., from 1.02A to 1.04A), the adjustment should be stopped immediately and the current value should be maintained. After 3 seconds, observe the luminous state of the first LED light source. If there is no flickering, no visible change in brightness, and the current display of the adjustable DC power supply shows a real-time current fluctuation of ≤±0.001A, it proves that the power supply output is stable and the first LED light source is in a "stable luminous state." If flickering occurs, check whether the wiring between the power supply and the LED is secure. After eliminating poor contact issues, repeat the adjustment and stabilization steps to ensure the validity of subsequent test data.

[0141] After the first LED light source reaches a stable luminous state, a color temperature meter is used to collect and record the mixed color temperature by placing it close to the center area of ​​the LCD panel under test. For example, when the first LED current is adjusted to 1.04A, the measured mixed color temperature after stabilization is 7820K; when adjusted to 1.06A, the measured color temperature is 7580K; when adjusted to 1.08A, the measured color temperature is 7250K; when adjusted to 1.10A, the measured color temperature is 6920K; and when adjusted to 1.12A, the measured color temperature is 6801K. The deviation is calculated using the formula "deviation = |current mixed color temperature - target color temperature|". Combined with the preset deviation requirement, the result is judged. The preset target color temperature is 6800K. When the first LED current is 1.04A, the deviation is |7820K - 6800K| = 1020K, which is much greater than 5K, and the deviation judgment result is "not met". When the current is 1.06A, the deviation is |7580K - 6800K| = 780K, still not met. When the current is 1.08A, the deviation is |7250K - 6800K| = 450K, still not met. When the current is 1.10A, the deviation is |6920K - 6800K| = 120K, still not meeting the preset requirement. Finally, when the current is 1.12A, the deviation is |6801K - 6800K| = 1K, which is less than the preset deviation requirement of 5K, and the deviation judgment result is "met".

[0142] When the first LED current is 1.04A, 1.06A, 1.08A, and 1.10A, the deviation judgment result is "not satisfied". It is necessary to return and continue to increase the power supply current of the first LED light source in 0.02A increments. For example, when the current is 1.10A, the deviation is 120K. After returning, adjust the current to 1.12A and repeat the steps to ensure that each adjustment is close to the target color temperature without directional deviation. When the first LED current is 1.12A, and the deviation between the current mixed color temperature of 6801K and the target value of 6800K is 1K≤5K, the deviation judgment result is "satisfied". The adjustment is stopped immediately, and the output parameters of the two power supplies are locked. The first LED light source current is locked at 1.12A (final adjustment value, higher than the initial reference current, to achieve an increase in the proportion of low color temperature light), and the second LED light source current is kept at 0.98A (unchanged to ensure stability at the high color temperature end).

[0143] Further reference Figure 3 As a response to the above Figure 2 The implementation of the method shown in this application provides an embodiment of a variable color temperature backlight control system for testing liquid crystal panels. This device embodiment is similar to... Figure 2 Corresponding to the method embodiments shown, this device can be specifically applied to various electronic devices.

[0144] like Figure 3 As shown, a variable color temperature backlight control system 300 for testing liquid crystal panels includes:

[0145] The parameter acquisition module 301 is used to obtain the color filter parameters of the color filter on the LCD panel to be tested.

[0146] The determination module 302 is communicatively connected to the parameter acquisition module and is used to determine the target color temperature adjustment range of the LCD panel to be tested based on the color filter parameters and preset color temperature matching conditions.

[0147] The identification and association module 303 is used to identify two configured LED adjustment module light sources with different fixed color temperatures, and associate them as the first LED adjustment module light source and the second LED adjustment module light source, respectively.

[0148] The calibration module 304 is communicatively connected to the determining module and the adjustment module identification and association module, respectively, and is used to perform extreme color temperature calibration operations on the first adjustment module LED adjustment module light source and the second adjustment module LED adjustment module light source based on the target color temperature adjustment range, respectively, to obtain the first reference current of the first adjustment module LED adjustment module light source and the second reference current of the second adjustment module LED adjustment module light source;

[0149] The adjustment module 305 is communicatively connected to the calibration module and the identification association module, respectively, and is used to perform dynamic adjustment operation on the current ratio of the light source of the first adjustment module LED adjustment module and the light source of the second adjustment module LED adjustment module based on the first reference current, the second reference current and the preset target color temperature, so as to switch to any target color temperature within the target color temperature adjustment range.

[0150] This application also provides computer equipment in its embodiments. Please refer to the following for details. Figure 4 , Figure 4 This is a basic structural block diagram of the computer device in this embodiment.

[0151] The computer device 4 includes a memory 41, a processor 42, and a network interface 43 that are interconnected via a system bus. It should be noted that only the computer device 4 with components 41-43 is shown in the figure; however, it should be understood that it is not required to implement all the shown components, and more or fewer components can be implemented alternatively. Those skilled in the art will understand that the computer device described here is a device capable of automatically performing numerical calculations and / or information processing according to pre-set or stored instructions, and its hardware includes, but is not limited to, microprocessors, application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), digital signal processors (DSPs), embedded devices, etc.

[0152] The computer device can be a desktop computer, laptop, handheld computer, or cloud server, etc. The computer device can interact with the user via a keyboard, mouse, remote control, touchpad, or voice control.

[0153] The memory 41 includes at least one type of readable storage medium, including flash memory, hard disk, multimedia card, card-type memory (e.g., SD or DX memory), random access memory (RAM), static random access memory (SRAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), programmable read-only memory (PROM), magnetic memory, magnetic disk, optical disk, etc. In some embodiments, the memory 41 may be an internal storage unit of the computer device 4, such as the hard disk or memory of the computer device 4. In other embodiments, the memory 41 may also be an external storage device of the computer device 4, such as a plug-in hard disk, smart media card (SMC), secure digital (SD) card, flash card, etc., equipped on the computer device 4. Of course, the memory 41 may include both the internal storage unit and its external storage device of the computer device 4. In this embodiment, the memory 41 is typically used to store the operating system and various application software installed on the computer device 4, such as computer-readable instructions for a variable color temperature backlight control method for testing liquid crystal panels. In addition, the memory 41 can also be used to temporarily store various types of data that have been output or will be output.

[0154] In some embodiments, the processor 42 may be a central processing unit (CPU), controller, microcontroller, microprocessor, or other data processing chip. The processor 42 is typically used to control the overall operation of the computer device 4. In this embodiment, the processor 42 is used to execute computer-readable instructions stored in the memory 41 or to process data, for example, to execute computer-readable instructions for the variable color temperature backlight control method used for liquid crystal panel testing.

[0155] The network interface 43 may include a wireless network interface or a wired network interface, which is typically used to establish communication connections between the computer device 4 and other electronic devices.

[0156] This invention can be used in a wide range of general-purpose or special-purpose computer system environments or configurations.

[0157] Examples include: personal computers, server computers, handheld or portable devices, tablet devices, multiprocessor systems, microprocessor-based systems, set-top boxes, programmable consumer electronics, network PCs, minicomputers, mainframe computers, and distributed computing environments that include any of the above systems or devices.

[0158] This invention can be described in the general context of computer-executable instructions that are executed by a computer, such as program modules.

[0159] Generally, program modules include routines, programs, objects, components, data structures, etc., that perform specific tasks or implement specific abstract data types. This invention can also be practiced in distributed computing environments where tasks are performed by remote processing devices connected via communication networks.

[0160] In a distributed computing environment, program modules can reside on local and remote computer storage media, including storage devices.

[0161] Specifically, those skilled in the art will understand that all or part of the processes in the methods of the above embodiments can be implemented by instructing related hardware with computer-readable instructions. These computer-readable instructions can be stored in a computer-readable storage medium. When the program is executed, it can include the processes of the embodiments of the methods described above. The aforementioned storage medium can be a magnetic disk, an optical disk, or a read-only memory (ROM). Non-volatile storage media such as ROM (ROM-only memory) or random access memory (RAM).

[0162] It should be understood that although the steps in the flowcharts in the accompanying drawings are shown sequentially as indicated by the arrows, these steps are not necessarily performed in the order indicated by the arrows. Unless otherwise expressly stated herein, there is no strict order in which these steps are performed, and they may be performed in other orders.

[0163] Moreover, at least some steps in the flowchart of the attached figure may include multiple sub-steps or multiple stages. These sub-steps or stages are not necessarily completed at the same time, but can be executed at different times. Their execution order is not necessarily sequential, but can be executed in turn or alternately with other steps or at least some of the sub-steps or stages of other steps.

[0164] Obviously, the embodiments described above are only some embodiments of the present invention, and not all embodiments. The accompanying drawings show preferred embodiments of the present invention, but do not limit the scope of the invention. The present invention can be implemented in many different forms; rather, these embodiments are provided to provide a thorough and complete understanding of the disclosure of the present invention.

[0165] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing specific embodiments or make equivalent substitutions for some of the technical features. Any equivalent structures made using the content of this specification and drawings, whether directly or indirectly applied to other related technical fields, are similarly within the scope of protection of this patent.

Claims

1. A variable color temperature backlight control method for testing liquid crystal panels, characterized in that, Includes the following steps: Obtain the color filter parameters on the LCD panel to be tested; Based on the color filter parameters and preset color temperature matching conditions, the target color temperature adjustment range of the LCD panel under test is determined. Identify two configured LED light sources with different fixed color temperatures and associate them as the first LED light source and the second LED light source, respectively; Based on the target color temperature adjustment range, extreme color temperature calibration operations are performed on the first LED light source and the second LED light source respectively to obtain the first reference current of the first LED light source and the second reference current of the second LED light source. Based on the first reference current, the second reference current, and the preset target color temperature, the current ratio of the first LED light source and the second LED light source is dynamically adjusted so that the LCD panel under test can be switched to any target color temperature within the target color temperature adjustment range. The step of performing extreme color temperature calibration operations on the first LED light source and the second LED light source based on the target color temperature adjustment range to obtain the first reference current of the first LED light source and the second reference current of the second LED light source includes: The low color temperature endpoint of the target color temperature adjustment range is defined as the first characteristic color temperature, and the high color temperature endpoint of the target color temperature adjustment range is defined as the second characteristic color temperature. Adjust the power supply current of the first LED light source to make the actual color temperature of the first LED light source closer to the first characteristic color temperature, until the actual color temperature of the first LED light source meets the preset stability condition. Adjust the power supply current of the second LED light source to make the actual color temperature of the second LED light source closer to the second characteristic color temperature, until the actual color temperature of the second LED light source meets the preset stability condition; When the actual color temperatures of the first LED light source and the second LED light source both meet the preset stability conditions, the current supply current of the first LED light source is determined as the first reference current, and the current supply current of the second LED light source is determined as the second reference current.

2. The variable color temperature backlight control method for testing liquid crystal panels according to claim 1, characterized in that, The color filter parameters include the color filter pigment type, the transmittance curve of the first color temperature band, and the transmittance curve of the second color temperature band, wherein the color temperature range of the first color temperature band is higher than that of the second color temperature band. The step of determining the target color temperature adjustment range of the LCD panel under test based on the color filter parameters and preset color temperature matching conditions includes: Based on the transmittance curve of the first color temperature range, the transmittance attenuation rate of the first color temperature range is determined. If the transmittance attenuation rate of the first color temperature range is lower than the preset first attenuation threshold, the color film pigment type is determined to be the first type of color film, and the target color temperature adjustment range is determined from the preset color temperature range library as the first matching range for the first type of color film. Based on the transmittance curve of the second color temperature range, the transmittance attenuation rate of the second color temperature range is determined. If the transmittance attenuation rate of the second color temperature range is lower than the first attenuation threshold, the color film pigment type is determined to be the second type of color film, and the target color temperature adjustment range is determined from the preset color temperature range library as the second adaptation range for the second type of color film. If the transmittance attenuation rate of the first color temperature range and the transmittance attenuation rate of the second color temperature range are between the first attenuation threshold and the preset second attenuation threshold, then the target color temperature adjustment range is determined to be a full adaptation range covering the first adaptation range and the second adaptation range.

3. The variable color temperature backlight control method for testing liquid crystal panels according to claim 1, characterized in that, The step of dynamically adjusting the current ratio of the first LED light source and the second LED light source based on the first reference current, the second reference current, and a preset target color temperature, and switching the LCD panel under test to any target color temperature within the target color temperature adjustment range, includes: The first LED light source is connected to the first reference current, and the second LED light source is connected to the second reference current, so that the LCD panel under test is in the initial mixed color temperature state; Obtain the initial mixed color temperature, determine the deviation between the initial mixed color temperature and the preset target color temperature, and determine the direction of color temperature adjustment; Based on the color temperature adjustment direction, the first reference current or the second reference current is determined as the target current. The target current is adjusted by a current ratio to obtain the current mixed color temperature and the current change trend of the current mixed color temperature approaching the target value. Based on the current change trend, the current ratio adjustment is continued until the current mixed color temperature reaches the preset target color temperature.

4. A variable color temperature backlight control method for testing liquid crystal panels according to claim 3, characterized in that, The step of determining the first reference current or the second reference current as the target current based on the color temperature adjustment direction, performing current ratio adjustment on the target current to obtain the current mixed color temperature and the current change trend of the current mixed color temperature approaching the target value, and continuing to perform the current ratio adjustment based on the current change trend until the current mixed color temperature reaches the preset target color temperature includes: When the color temperature adjustment direction is the high color temperature direction, the second reference current is determined as the target current, and the second reference current is gradually adjusted with a preset current step size to obtain the current change trend of the second LED light source current; Based on the current change trend of the second LED light source current, a stabilization time is set so that the second LED light source is in a stable light-emitting state; The first mixed color temperature of the liquid crystal panel under test is obtained when it is in a stable light-emitting state. The deviation between the first mixed color temperature and the preset target color temperature is compared to obtain the first deviation judgment result. If the first deviation judgment result does not meet the preset deviation requirement, then return to the execution where the color temperature adjustment direction is the high color temperature direction, determine the second reference current as the target current, and gradually adjust the second reference current with a preset current step size to obtain the current change trend of the second LED light source current until the first deviation judgment result meets the preset deviation requirement.

5. A variable color temperature backlight control method for testing liquid crystal panels according to claim 3, characterized in that, The step of determining the first reference current or the second reference current as the target current based on the color temperature adjustment direction, performing current ratio adjustment on the target current to obtain the current mixed color temperature and the current change trend of the current mixed color temperature approaching the target value, and continuing to perform the current ratio adjustment based on the current change trend until the current mixed color temperature reaches the preset target color temperature includes: When the color temperature adjustment direction is the low color temperature direction, the first reference current is determined as the target current, and the first reference current is gradually adjusted with a preset current step size to obtain the current change trend of the first LED light source current. Based on the current change trend of the first LED light source current, a stabilization time is set so that the first LED light source is in a stable light-emitting state. The second mixed color temperature of the liquid crystal panel under test is obtained when it is in a stable light-emitting state. The deviation between the second mixed color temperature and the preset target color temperature is compared to obtain the second deviation judgment result. If the second deviation judgment result does not meet the preset deviation requirement, then return to the execution where the color temperature adjustment direction is the low color temperature direction, determine the first reference current as the target current, and gradually adjust the first reference current with a preset current step size to obtain the current change trend of the first LED light source current.

6. A variable color temperature backlight control system for testing liquid crystal panels, characterized in that, include: The parameter acquisition module is used to obtain the color filter parameters of the color filter on the LCD panel to be tested. The determination module is communicatively connected to the parameter acquisition module and is used to determine the target color temperature adjustment range of the LCD panel to be tested based on the color filter parameters and preset color temperature matching conditions. The identification and association module is used to identify two configured LED light sources with different fixed color temperatures and associate them as the first LED light source and the second LED light source, respectively. The calibration module is communicatively connected to the determination module and the identification association module, and is used to perform extreme color temperature calibration operations on the first LED light source and the second LED light source based on the target color temperature adjustment range, to obtain the first reference current of the first LED light source and the second reference current of the second LED light source. The adjustment module is communicatively connected to the calibration module and the identification association module, respectively, and is used to perform dynamic adjustment operation on the current ratio of the first LED light source and the second LED light source based on the first reference current, the second reference current and the preset target color temperature, so that the LCD panel under test can be switched to any target color temperature within the target color temperature adjustment range; The step of performing extreme color temperature calibration operations on the first LED light source and the second LED light source based on the target color temperature adjustment range to obtain the first reference current of the first LED light source and the second reference current of the second LED light source includes: The low color temperature endpoint of the target color temperature adjustment range is defined as the first characteristic color temperature, and the high color temperature endpoint of the target color temperature adjustment range is defined as the second characteristic color temperature. Adjust the power supply current of the first LED light source to make the actual color temperature of the first LED light source closer to the first characteristic color temperature, until the actual color temperature of the first LED light source meets the preset stability condition. Adjust the power supply current of the second LED light source to make the actual color temperature of the second LED light source closer to the second characteristic color temperature, until the actual color temperature of the second LED light source meets the preset stability condition; When the actual color temperatures of the first LED light source and the second LED light source both meet the preset stability conditions, the current supply current of the first LED light source is determined as the first reference current, and the current supply current of the second LED light source is determined as the second reference current.

7. A computer device, characterized in that, The device includes a memory and a processor, wherein the memory stores computer-readable instructions, and the processor executes the computer-readable instructions to implement the steps of the variable color temperature backlight control method for testing a liquid crystal panel as described in any one of claims 1 to 5.

8. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores computer-readable instructions, which, when executed by a processor, implement the steps of the variable color temperature backlight control method for testing a liquid crystal panel as described in any one of claims 1 to 5.

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