Method, device and equipment for evaluating optical brightness of liquid crystal display and medium

Abstract

The invention provides an optical brightness evaluation method, device and equipment of a liquid crystal display and a medium, and relates to the technical field of optical brightness evaluation.The method comprises the steps that the transmittance of a liquid crystal panel of a to-be-detected display, the effective display area size of the liquid crystal panel and the light emitting parameter of a backlight light emitting unit are obtained; then, a brightness gain coefficient of a diaphragm framework and a laminating process and a conversion coefficient and luminous efficiency of a backlight light-emitting unit are searched from a pre-constructed optical influence factor database, and finally, an optical brightness evaluation index of the display to be tested is determined by combining the parameters. And performing optical brightness evaluation on the to-be-tested display according to the optical brightness evaluation index. According to the method for automatically evaluating the optical brightness, the optical brightness of the to-be-tested display can be automatically simulated, evaluation of the optical brightness of the to-be-tested display is achieved, and compared with optical brightness evaluation based on experience, the method is higher in evaluation precision and shorter in consumed time.

Description

Technical Field

[0001] This application relates to the technical field of optical brightness evaluation, and particularly to an optical brightness evaluation method, device, equipment and medium for a liquid crystal display. Background Art

[0002] In-vehicle liquid crystal displays are widely used in automotive instruments, central control platforms and other product applications, and are important interfaces for human-computer interaction, used for displaying graphics, text and video output. Different environments require products with different brightnesses, and different product brightnesses require completely different material combinations and costs. At present, the development cycle of electronic products is getting faster and faster, and the R & D team needs to quickly, accurately and timely make high-performance product designs to meet market demands.

[0003] The existing brightness evaluation methods mainly estimate the brightness based on the experience of technicians to complete the brightness evaluation. The evaluation results obtained in this way deviate from the actual brightness, with low accuracy and long evaluation time. Summary of the Invention

[0004] Based on this, in view of the technical problems of low evaluation accuracy and long evaluation cycle, it is necessary to provide an optical brightness evaluation method, device, equipment and medium for a liquid crystal display to improve the evaluation accuracy and shorten the evaluation time.

[0005] In a first aspect, an optical brightness evaluation method for a liquid crystal display is proposed. The method includes: determining the film structure of the display to be measured, the lamination process adopted by the display to be measured, and the backlight light-emitting unit of the display to be measured; obtaining the transmittance of the liquid crystal panel of the display to be measured, the effective display area size of the liquid crystal panel, and the light-emitting parameters of the backlight light-emitting unit; the light-emitting parameters include the lumen value corresponding to the light-emitting level of the backlight light-emitting unit; looking up the first brightness gain coefficient of the film structure, the conversion coefficient of the backlight light-emitting unit, the light-emitting efficiency of the backlight light-emitting unit, and the second brightness gain coefficient corresponding to the lamination process from a pre-constructed optical influence factor database; wherein, the conversion coefficient is the conversion coefficient between the lumen value and the luminous intensity; calculating the backlight brightness value of the display to be measured according to the effective display area size of the liquid crystal panel, the light-emitting parameters of the backlight light-emitting unit, the first brightness gain coefficient of the film structure, the conversion coefficient and the light-emitting efficiency; calculating the optical brightness evaluation index of the display to be measured according to the backlight brightness value, the transmittance of the liquid crystal panel and the second brightness gain coefficient, so as to evaluate the optical brightness of the display to be measured according to the optical brightness evaluation index.

[0006] In an embodiment of the present application, the optical brightness evaluation index includes the brightness value of the touch panel module. Calculating the optical brightness evaluation index of the display to be measured according to the backlight brightness value, the transmittance of the liquid crystal panel, and the second brightness gain coefficient includes: calculating the brightness value of the liquid crystal display module of the display to be measured according to the backlight brightness value and the transmittance of the liquid crystal panel; calculating the brightness value of the touch panel module of the display to be measured according to the brightness value of the liquid crystal display module and the second brightness gain coefficient.

[0007] In an embodiment of the present application, the light-emitting parameters include the number of backlight light-emitting units and the current value corresponding to the backlight light-emitting units.

[0008] In an embodiment of the present application, the lumen value includes the typical lumen value, the current value includes the typical current value and the minimum current value. Calculating the backlight brightness value of the display to be measured according to the effective display area size of the liquid crystal panel, the light-emitting parameters of the backlight light-emitting units, the first brightness gain coefficient of the film structure, the conversion coefficient, and the luminous efficiency includes: calculating a first product value among the typical lumen value, the number of backlight light-emitting units, the minimum current value, the conversion coefficient, the luminous efficiency, and the first brightness gain coefficient; calculating a second product value between the luminous area corresponding to the effective display area size and the typical current value; calculating the ratio between the first product value and the second product value to obtain the typical value of the backlight brightness; determining the backlight brightness value according to the typical value of the backlight brightness.

[0009] In an embodiment of the present application, the backlight brightness value is the typical value of the backlight brightness. Calculating the brightness value of the liquid crystal display module of the display to be measured according to the backlight brightness value and the transmittance of the liquid crystal panel includes: calculating the product between the typical value of the backlight brightness and the transmittance of the liquid crystal panel to obtain the typical brightness value of the liquid crystal display module; determining the brightness value of the liquid crystal display module according to the typical brightness value of the liquid crystal display module.

[0010] In an embodiment of the present application, the brightness value of the liquid crystal display module is the typical brightness value of the liquid crystal display module, and the brightness value of the touch panel module includes the minimum brightness value of the touch panel module. Calculating the brightness value of the touch panel module of the display to be measured according to the brightness value of the liquid crystal display module and the second brightness gain coefficient includes: calculating the product between the typical brightness value of the liquid crystal display module and the second brightness gain coefficient to obtain the typical brightness value of the touch panel module; obtaining a third brightness gain coefficient, where the third brightness gain coefficient is the brightness gain coefficient between the typical brightness value and the minimum brightness value of the touch panel module; calculating the minimum brightness value of the touch panel module according to the third brightness gain coefficient and the typical brightness value of the touch panel module.

[0011] In an embodiment of the present application, the optical brightness evaluation index further includes the minimum brightness value of the touch panel module under the white balance specification. The brightness value of the touch panel module includes the typical brightness value. After calculating the brightness value of the touch panel module of the display to be measured according to the brightness value of the liquid crystal display module and the second brightness gain coefficient, the method further includes: obtaining the white balance specification of the display to be measured to determine a fourth brightness gain coefficient corresponding to the white balance specification; calculating the product of the typical brightness value of the touch panel module and the fourth brightness gain coefficient to obtain the typical brightness value of the touch panel module under the white balance specification; obtaining a fifth brightness gain coefficient, where the fifth brightness gain coefficient is the gain coefficient between the typical brightness value and the minimum brightness value of the touch panel module under the white balance specification; calculating the product between the fifth brightness gain coefficient and the typical brightness value of the touch panel module under the white balance specification to obtain the minimum brightness value of the touch panel module under the white balance specification.

[0012] In a second aspect, an optical brightness evaluation device for a liquid crystal display is proposed. The device includes: a determination module for determining the film stack architecture of the display to be measured, the bonding process adopted by the display to be measured, and the backlight light-emitting unit of the display to be measured; an acquisition module for acquiring the transmittance of the liquid crystal panel of the display to be measured, the effective display area size of the liquid crystal panel, and the light-emitting parameters of the backlight light-emitting unit; the light-emitting parameters include the lumen value corresponding to the light-emitting level of the backlight light-emitting unit; a search module for searching in a pre-constructed optical influence factor database for the first brightness gain coefficient of the film stack architecture, the conversion coefficient of the backlight light-emitting unit, the luminous efficiency of the backlight light-emitting unit, and the second brightness gain coefficient corresponding to the bonding process; wherein the conversion coefficient is the conversion coefficient between the lumen value and the luminous intensity; a calculation module for calculating the backlight brightness value of the display to be measured according to the effective display area size of the liquid crystal panel, the light-emitting parameters of the backlight light-emitting unit, the first brightness gain coefficient of the film stack architecture, the conversion coefficient, and the luminous efficiency; an evaluation module for calculating the optical brightness evaluation index of the display to be measured according to the backlight brightness value, the transmittance of the liquid crystal panel, and the second brightness gain coefficient, so as to evaluate the optical brightness of the display to be measured according to the optical brightness evaluation index.

[0013] In an embodiment of the present application, the optical brightness evaluation index includes the brightness value of the touch panel module. The evaluation module is configured to: calculate the brightness value of the liquid crystal display module of the display to be measured according to the backlight brightness value and the transmittance of the liquid crystal panel; calculate the brightness value of the touch panel module of the display to be measured according to the brightness value of the liquid crystal display module and the second brightness gain coefficient.

[0014] In an embodiment of the present application, the light-emitting parameters include the number of backlight light-emitting units and the current value corresponding to the backlight light-emitting unit.

[0015] In an embodiment of the present application, the lumen value includes the typical lumen value, and the current value includes the typical current value and the minimum current value. The calculation module is configured to: calculate a first product value among the typical lumen value, the number of backlight light-emitting units, the minimum current value, the conversion coefficient, the luminous efficiency, and the first brightness gain coefficient; calculate a second product value between the luminous area corresponding to the effective display area size and the typical current value; calculate the ratio between the first product value and the second product value to obtain the typical value of the backlight brightness; determine the backlight brightness value according to the typical value of the backlight brightness.

[0016] In an embodiment of the present application, the backlight brightness value is the typical value of the backlight brightness; the evaluation module is configured to: calculate the product of the typical value of the backlight brightness and the transmittance of the liquid crystal panel to obtain the typical brightness value of the liquid crystal display module; determine the brightness value of the liquid crystal display module according to the typical brightness value of the liquid crystal display module.

[0017] In an embodiment of the present application, the brightness value of the liquid crystal display module is the typical brightness value of the liquid crystal display module, and the brightness value of the touch panel module includes the minimum brightness value of the touch panel module. The evaluation module is configured to: calculate the product of the typical brightness value of the liquid crystal display module and the second brightness gain coefficient to obtain the typical brightness value of the touch panel module; obtain a third brightness gain coefficient, where the third brightness gain coefficient is the brightness gain coefficient between the typical brightness value and the minimum brightness value of the touch panel module; calculate the minimum brightness value of the touch panel module according to the third brightness gain coefficient and the typical brightness value of the touch panel module.

[0018] In an embodiment of the present application, the optical brightness evaluation index further includes the minimum brightness value of the touch panel module under the white balance specification. The brightness value of the touch panel module includes the typical brightness value. The evaluation module is further configured to: obtain the white balance specification of the to-be-tested display to determine a fourth brightness gain coefficient corresponding to the white balance specification; calculate the product of the typical brightness value of the touch panel module and the fourth brightness gain coefficient to obtain the typical brightness value of the touch panel module under the white balance specification; obtain a fifth brightness gain coefficient, where the fifth brightness gain coefficient is the gain coefficient between the typical brightness value and the minimum brightness value of the touch panel module under the white balance specification; calculate the product of the fifth brightness gain coefficient and the typical brightness value of the touch panel module under the white balance specification to obtain the minimum brightness value of the touch panel module under the white balance specification.

[0019] In a third aspect, an electronic device is provided, including a memory, a processor, and a computer program stored on the memory and executable on the processor. When the processor executes the computer program, the steps of the optical brightness evaluation method of the liquid crystal display as proposed in any one of the embodiments of the first aspect are implemented.

[0020] In a fourth aspect, a computer-readable storage medium is provided, on which a computer program is stored. When the program is executed by a processor, the steps of the optical brightness evaluation method of the liquid crystal display as proposed in any one of the embodiments of the first aspect are implemented.

[0021] In summary, the present application proposes an optical brightness evaluation method, apparatus, device and medium for a liquid crystal display. For each display to be measured, the method first determines the film structure, the bonding process used, and the selected backlight light-emitting unit of the display to be measured, and at the same time obtains the transmittance of the liquid crystal panel of the display to be measured, the effective display area size of the liquid crystal panel, and the light-emitting parameters of the backlight light-emitting unit; then, it looks up the first brightness gain coefficient of the above film structure, the conversion coefficient of the backlight light-emitting unit, the light-emitting efficiency of the backlight light-emitting unit, and the second brightness gain coefficient corresponding to the above bonding process from the pre-constructed optical influence factor database. Finally, combining the above parameters, it first calculates the backlight brightness value of the display to be measured, and then determines the optical brightness evaluation index of the display to be measured based on the backlight brightness value, so as to evaluate the optical brightness of the display to be measured according to the optical brightness evaluation index. In this way, a method for automatic optical brightness evaluation is proposed. By storing the gain coefficients, conversion coefficients, light-emitting efficiencies, etc. measured in advance for different types of light-emitting units and different structures of film structures in the database, it can conveniently meet the optical brightness simulation requirements of different displays to be measured. In this way, when evaluating the optical brightness of the display to be measured, the user only needs to provide the personalized parameters of the display to be measured, such as the selected film structure, the bonding process used, the selected light-emitting unit, the transmittance and effective display area set for the liquid crystal panel, and the light-emitting parameters of the backlight light-emitting unit, etc., and the optical brightness of the display to be measured can be automatically simulated, realizing the evaluation of the optical brightness of the display to be measured. Compared with the optical brightness evaluation based on experience, the evaluation accuracy of the present application is higher and the time consumption is shorter. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments of the present invention. Obviously, the drawings in the following description are only some embodiments of the present invention, and those of ordinary skill in the art can also obtain other drawings without creative efforts based on these drawings.

[0023] Figure 1 is a flowchart showing a method for evaluating the optical brightness of a liquid crystal display according to an exemplary embodiment of the present application; Figure 2 is a flowchart showing a method for evaluating the optical brightness of a liquid crystal display according to another exemplary embodiment of the present application; Figure 3 is a flowchart showing a method for evaluating the optical brightness of a liquid crystal display according to another exemplary embodiment of the present application; Figure 4 is a flowchart showing a method for evaluating the optical brightness of a liquid crystal display according to another exemplary embodiment of the present application; Figure 5 It is a schematic flowchart of an optical brightness evaluation method for a liquid crystal display shown according to another exemplary embodiment of the present application; Figure 6 It is a block diagram of an optical brightness evaluation device for a liquid crystal display shown according to an exemplary embodiment of the present application; Figure 7 It is a schematic block diagram of an electronic device shown according to an exemplary embodiment of the present application. Detailed implementation manners

[0024] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are some, but not all, of the embodiments of the present application. The embodiments described by referring to the accompanying drawings are exemplary and are intended to explain the present application, and should not be construed as a limitation to the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

[0025] Figure 1 It is a schematic flowchart of an optical brightness evaluation method for a liquid crystal display shown according to an exemplary embodiment of the present application. As Figure 1 shown, the optical brightness evaluation method may include the following steps: S101, determine the film structure of the display to be measured, the bonding process adopted by the display to be measured, and the backlight light-emitting unit of the display to be measured.

[0026] Exemplarily, the optical brightness evaluation method for the liquid crystal display proposed in the embodiments of the present application can be applied to the optical brightness evaluation of display devices such as in-vehicle liquid crystal displays.

[0027] For the convenience of description, any in-vehicle liquid crystal display that needs to be optically brightness evaluated is expressed as the display to be measured.

[0028] The device information filled in by the user on the interactive page for the display to be measured can be obtained through the interactive platform. For example, the filled device information may include the film structure of the display to be measured, the bonding process adopted by the display to be measured, and the backlight light-emitting unit of the display to be measured.

[0029] Among them, common in-vehicle backlight films for in-vehicle liquid crystal displays include diffusion films, prism sheets, reflective polarizers, and so on. Different film materials are combined to form different film structures. For example, a film structure composed of a diffusion film and a lower prism sheet, a film structure composed of a diffusion film and a reflective polarizer, a film structure composed of a diffusion film, an upper prism sheet, and a lower prism sheet, and so on.

[0030] The lamination process adopted by the display to be tested can be understood as the bonding method between the liquid crystal panel and the touch screen of the display to be tested. For example, the lamination process adopted by the display to be tested may include in-vehicle full lamination, in-vehicle 3A film lamination, and so on.

[0031] The light-emitting unit of the backlight of the display to be tested can be understood as the light-emitting element of the backlight. For example, the light-emitting unit of the backlight may include cold cathode fluorescent lamps, light-emitting diodes, organic light-emitting diodes, and so on.

[0032] S102, obtain the transmittance of the liquid crystal panel of the display to be tested, the size of the effective display area of the liquid crystal panel, and the light-emitting parameters of the light-emitting unit of the backlight; the light-emitting parameters include the lumen value corresponding to the light-emitting level of the light-emitting unit of the backlight.

[0033] Exemplarily, obtain the transmittance of the liquid crystal panel, the size of the effective display area of the liquid crystal panel, and the light-emitting parameters of the light-emitting unit of the backlight submitted by the user for the display to be tested through an interactive page.

[0034] Among them, the light-emitting parameters of the light-emitting unit of the backlight may include but are not limited to the following: the number of light-emitting units of the backlight, the lumen value corresponding to the light-emitting level of the light-emitting unit of the backlight, the current value corresponding to the light-emitting unit of the backlight, and so on.

[0035] In some embodiments, the lumen value corresponding to the light-emitting level may include the minimum lumen value and the typical lumen value. The current value corresponding to the light-emitting unit of the backlight may include the operating current value and the typical current value.

[0036] S103, look up the first brightness gain coefficient of the film structure, the conversion coefficient of the light-emitting unit of the backlight, the luminous efficiency of the light-emitting unit of the backlight, and the second brightness gain coefficient corresponding to the lamination process from the pre-constructed optical influence factor database; among them, the conversion coefficient is the conversion coefficient between the lumen value and the luminous intensity.

[0037] Exemplarily, pre-test the gain coefficient of different film structures for optical brightness. For the convenience of distinction, this embodiment is expressed as the first brightness gain coefficient.

[0038] Pre-test the conversion coefficients of different light-emitting units of the backlight, such as the conversion coefficients of domestic LEDs, imported LEDs, and so on. Among them, the conversion coefficient is the unit conversion coefficient for converting lumens (lm) to millicandelas (mcd), or it can be understood as the conversion coefficient for converting the lumen value to the luminous intensity.

[0039] Pre-test the gain coefficient of different lamination processes for optical brightness. For the convenience of distinction, this embodiment is expressed as the second brightness gain coefficient.

[0040] The measured parameters can be stored in the database in the form of key-value pairs as the optical influence factor database. In the application, the first brightness gain coefficient corresponding to the film structure of the display to be measured, the conversion coefficient of the backlight light-emitting unit, the luminous efficiency of the backlight light-emitting unit, and the second brightness gain coefficient corresponding to the bonding process adopted by the display to be measured can be found from the optical influence factor database.

[0041] S104. Calculate the backlight brightness value of the display to be measured according to the effective display area size of the liquid crystal panel, the light-emitting parameters of the backlight light-emitting unit, the first brightness gain coefficient, the conversion coefficient, and the luminous efficiency of the film structure.

[0042] Exemplarily, if the backlight light-emitting unit is an LED, the light-emitting parameters of the backlight light-emitting unit include the typical lumen value d corresponding to the light-emitting level (LED rank) of the backlight light-emitting unit, the number e of the backlight light-emitting units, the minimum current value I1 of the backlight light-emitting unit, and the typical power value I of the backlight light-emitting unit. Then the backlight brightness value can be calculated by the following formula: ; Among them, the typical value of the BLU brightness can be used as a backlight brightness value, d represents the typical lumen value of the LED, e represents the number of LEDs, b represents the conversion coefficient of the LED, f represents the unit conversion coefficient f for converting millicandela (mcd) to candela (cd); c represents the luminous efficiency of the LED, a1 represents the first brightness gain coefficient of the film structure, I1 represents the minimum current value of the LED, x represents the width of the effective display area of the liquid crystal panel, y represents the length of the effective display area of the liquid crystal panel, and I represents the typical current value of the LED.

[0043] It should be noted that the constant 2 in the above formula is used to represent the outer expansion margin of the effective display area, that is, represents the luminous area corresponding to the effective display area size, and the specific value can be set according to needs, and this application does not make limitations.

[0044] S105. Calculate the optical brightness evaluation index of the display to be measured according to the backlight brightness value, the transmittance of the liquid crystal panel, and the second brightness gain coefficient, so as to evaluate the optical brightness of the display to be measured according to the optical brightness evaluation index.

[0045] Exemplarily, after determining the backlight brightness value, the brightness value of the liquid crystal display module and the brightness value of the touch panel module can be determined according to the backlight brightness value, the transmittance of the liquid crystal panel, and the second brightness gain coefficient.

[0046] The optical brightness evaluation index can include the brightness value of the liquid crystal display module and / or the brightness value of the touch panel module.

[0047] When evaluating the optical brightness of a display to be measured using an optical brightness evaluation index, it can be implemented in the following manner: First, obtain the minimum target brightness Nmin required by the user; Then compare the optical brightness evaluation index with the minimum target brightness Nmin. When Nmin ≥ the optical brightness evaluation index, it is determined that the optical brightness of the display to be measured meets the standard; When Nmin < the optical brightness evaluation index, it is determined that the optical brightness of the display to be measured does not meet the standard.

[0048] In summary, for the optical brightness evaluation method of the liquid crystal display proposed in the embodiments of the present application, for each display to be measured, first determine the film stack architecture, the lamination process used, and the selected backlight light-emitting unit of the display to be measured. At the same time, obtain the transmittance of the liquid crystal panel of the display to be measured, the effective display area size of the liquid crystal panel, and the light-emitting parameters of the backlight light-emitting unit; then look up the first brightness gain coefficient of the above film stack architecture, the conversion coefficient of the backlight light-emitting unit, the luminous efficiency of the backlight light-emitting unit, and the second brightness gain coefficient corresponding to the above lamination process from the pre-constructed optical influence factor database. Finally, combine the above parameters to first calculate the backlight brightness value of the display to be measured, and then determine the optical brightness evaluation index of the display to be measured based on this backlight brightness value, so as to evaluate the optical brightness of the display to be measured according to this optical brightness evaluation index. In this way, a method for automatic optical brightness evaluation is proposed. By storing the gain coefficients, conversion coefficients, luminous efficiencies, etc. measured in advance for different types of light-emitting units and different film stack architectures in the database, it can conveniently meet the optical brightness simulation requirements of different displays to be measured. In this way, when evaluating the optical brightness of a display to be measured, only the user needs to provide the personalized parameters of the display to be measured, such as the selected film stack architecture, the lamination process used, the selected light-emitting unit, the transmittance and effective display area set for the liquid crystal panel, and the light-emitting parameters of the backlight light-emitting unit, etc., to automatically simulate the optical brightness of the display to be measured and achieve the evaluation of the optical brightness of the display to be measured. Compared with the optical brightness evaluation based on experience, the evaluation accuracy of the present application is higher and the time consumption is shorter.

[0049] In some embodiments, as Figure 2 shown, if the optical brightness evaluation index includes the brightness value of the touch panel module, then the step "calculate the optical brightness evaluation index of the display to be measured according to the backlight brightness value, the transmittance of the liquid crystal panel, and the second brightness gain coefficient" in the above step S105 may include the following steps: S201, calculate the brightness value of the liquid crystal display module of the display to be measured according to the backlight brightness value and the transmittance of the liquid crystal panel.

[0050] Exemplarily, multiply the backlight brightness value by the transmittance of the liquid crystal panel to determine the luminous brightness of the backlight source passing through the liquid crystal panel, and obtain the brightness value of the liquid crystal display module of the display to be measured.

[0051] S202. Calculate the brightness value of the touch panel module of the display to be measured according to the brightness value of the liquid crystal display module and the second brightness gain coefficient.

[0052] Exemplarily, multiply the brightness value of the liquid crystal display module by the second brightness gain coefficient of the bonding process to determine the brightness presented by the backlight source on the touch screen after the touch screen is adhered to the liquid crystal panel, that is, obtain the brightness value of the touch panel module of the display to be measured.

[0053] In this embodiment, based on the backlight brightness value of the display to be measured, the influence of the transmittance of the liquid crystal panel and the bonding process on the display brightness of the display is introduced. Combining the backlight brightness value, the transmittance of the liquid crystal panel, and the second brightness gain coefficient corresponding to the bonding process, the brightness value of the touch panel module of the display to be measured is determined, so as to accurately simulate the brightness value presented by the display to be measured on the touch panel, thereby accurately evaluating the luminous brightness of the display to be measured.

[0054] In some embodiments, as Figure 3 shown, if the lumen value included in the light-emitting parameters of the backlight light-emitting unit in the above steps is a typical lumen value, and the current value includes a typical current value and a minimum current value, then in the above step S104, "calculate the backlight brightness value of the display to be measured according to the effective display area size of the liquid crystal panel, the light-emitting parameters of the backlight light-emitting unit, the first brightness gain coefficient of the film stack architecture, the conversion coefficient, and the luminous efficiency" includes: S301. Calculate the typical lumen value, the number of backlight light-emitting units, the minimum current value, the conversion coefficient, the luminous efficiency, and the first brightness gain coefficient.

[0055] S302. Calculate the second product value between the luminous area corresponding to the effective display area size and the typical current value; S303. Calculate the ratio between the first product value and the second product value to obtain the typical value of the backlight brightness.

[0056] Exemplarily, the typical value of the backlight brightness = (typical lumen value number of backlight light-emitting units minimum current value conversion coefficient luminous efficiency first brightness gain coefficient) / (luminous area corresponding to the effective display area size Typical current value). It should be noted that when calculating the typical value of the backlight brightness, a unit conversion coefficient, such as f in the above embodiments, can be introduced during the calculation as needed to ensure that the calculation units of all parameters match.

[0057] S304. Determine the backlight brightness value according to the typical value of the backlight brightness.

[0058] Exemplarily, the backlight brightness value can be the typical value of the backlight brightness or the minimum value of the backlight brightness; If the backlight brightness value is the minimum value of the backlight brightness, the minimum value of the backlight brightness can be determined according to the typical value of the backlight brightness and the gain coefficient between the typical value and the minimum value. Among them, the gain coefficient between the typical value and the minimum value can be obtained through pre-measurement, and its specific value is not limited in this application.

[0059] In some embodiments, such as Figure 4 shown, if the backlight brightness value is the typical value of the backlight brightness, then in the above step S201, "calculate the brightness value of the liquid crystal display module of the display to be measured according to the backlight brightness value and the transmittance of the liquid crystal panel" includes: S401. Calculate the product of the typical value of the backlight brightness and the transmittance of the liquid crystal panel to obtain the typical brightness value of the liquid crystal display module.

[0060] S402. Determine the brightness value of the liquid crystal display module according to the typical brightness value of the liquid crystal display module.

[0061] Exemplarily, the brightness value of the liquid crystal display module can include the minimum brightness value and / or the typical brightness value of the liquid crystal display module. The minimum brightness value of the liquid crystal display module can be calculated in the following way: Obtain the gain coefficient between the typical brightness value and the minimum brightness value of the liquid crystal display module, and calculate the product of the typical brightness value of the liquid crystal display module and the above gain coefficient to obtain the minimum brightness value of the liquid crystal display module.

[0062] In some embodiments, such as Figure 5 shown, if the brightness value of the liquid crystal display module is the typical brightness value of the liquid crystal display module, then in the above S202, "calculate the brightness value of the touch panel module of the display to be measured according to the brightness value of the liquid crystal display module and the second brightness gain coefficient" includes: S501. Calculate the product of the typical brightness value of the liquid crystal display module and the second brightness gain coefficient to obtain the typical brightness value of the touch panel module; S502. Obtain the third brightness gain coefficient, where the third brightness gain coefficient is the brightness gain coefficient between the typical brightness value of the touch panel module and the minimum brightness value; S503. Calculate the minimum brightness of the touch panel module according to the third brightness gain coefficient and the typical brightness value of the touch panel module.

[0063] Exemplarily, take the product between the typical brightness value of the liquid crystal display module and the second brightness gain coefficient corresponding to the lamination process as the typical brightness value of the touch panel module.

[0064] Then, use the gain coefficient between the typical brightness value and the minimum brightness value of the touch panel module, that is, the above-mentioned third brightness gain coefficient, to determine the minimum brightness value of the touch panel module based on the typical brightness value of the touch panel module.

[0065] This application first calculates the typical brightness value of the touch panel module, and then determines the minimum brightness value based on the typical brightness value. Take the minimum brightness value of the touch panel module as an optical brightness evaluation index to judge whether the minimum brightness value of the touch panel module meets the standard, so as to complete the optical brightness evaluation of the display to be tested, thereby enhancing the brightness evaluation effect of the display to be tested.

[0066] Based on some embodiments, if the optical brightness evaluation index further includes the minimum brightness value of the touch panel module under the white balance specification, and the brightness value of the touch panel module includes the typical brightness value, then after "calculating the brightness value of the touch panel module of the display to be tested according to the brightness value of the liquid crystal display module and the second brightness gain coefficient" in the above step S202, the method further includes: Obtain the white balance specification of the display to be tested to determine the fourth brightness gain coefficient corresponding to the white balance specification; calculate the product of the typical brightness value of the touch panel module and the fourth brightness gain coefficient to obtain the typical brightness value of the touch panel module under the white balance specification; obtain the fifth brightness gain coefficient, where the fifth brightness gain coefficient is the gain coefficient between the typical brightness value and the minimum brightness value of the touch panel module under the white balance specification; calculate the product between the fifth brightness gain coefficient and the typical brightness value of the touch panel module under the white balance specification to obtain the minimum brightness value of the touch panel module under the white balance specification.

[0067] Exemplarily, some display products need to burn in the white balance, and there are various white balance specifications.

[0068] For example, A: white balance white point ±0.01, and its measured brightness gain coefficient is k; the gain coefficient between the typical brightness value and the minimum brightness value of the touch panel module under this white balance specification is h1; B: white balance white point ±0.005, and its measured brightness gain coefficient is m, and the gain coefficient between the typical brightness value and the minimum brightness value of the touch panel module under this white balance specification is h2; Then the typical brightness value of the touch panel module under the white balance specification A: A brightness (typ) = TPM brightness (typ) k. Among them, the TPM brightness (typ) represents the typical value of the brightness of the touch panel module.

[0069] The minimum brightness of the touch panel module under white balance specification A: A brightness (min) = A brightness (typ) h1.

[0070] The typical brightness of the touch panel module under white balance specification B: B brightness (typ) = TPM brightness (typ) m.

[0071] The minimum brightness of the touch panel module under white balance specification B: B brightness (min) = B brightness (typ) h2.

[0072] In some embodiments, the minimum brightness of the liquid crystal display module, the minimum brightness of the touch panel module, the minimum brightness of the touch panel module under white balance specifications, and the customer target brightness minimum value Nmin can be automatically compared respectively to complete the optical brightness evaluation.

[0073] For example, if Nmin > A brightness (min), it is determined that the optical brightness evaluation passes; If Nmin < A brightness (min), it is determined that the optical brightness evaluation fails.

[0074] In one embodiment, based on the optical brightness evaluation method proposed in the embodiments of the present application, an XML table can be constructed, and the above optical evaluation method can be encapsulated into the calculation formula and callable API of the table. After the user fills in parameters such as the transmittance of the liquid crystal panel, the number of LED beads, and the current value of the LED of the display to be tested in the table, the XML table can obtain the parameters of the pre-measured optical influence factors from the database based on the API, and then call the calculation formula based on the above data to automatically calculate the optical brightness evaluation indicators such as the backlight brightness value, the brightness value of the liquid crystal display module, the brightness value of the touch panel module, and the brightness value of the touch panel module after burning white balance. Finally, based on these optical brightness evaluation indicators, it is determined whether the display to be tested meets the customer specification requirements. If it meets, it is highlighted with green overlay, and if it does not meet, it is highlighted with red overlay, so as to shorten the evaluation time and improve the evaluation accuracy. It should be understood that the order of the numbers of the steps in the above embodiments does not mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation to the implementation process of the embodiments of the present application.

[0075] Figure 6 is a block diagram of an optical brightness evaluation device of a liquid crystal display shown according to an exemplary embodiment of the present application, as Figure 6 shown, the device 600 includes: A determination module 601, configured to determine the film structure of the display to be measured, the bonding process adopted by the display to be measured, and the backlight light-emitting unit of the display to be measured; An acquisition module 602, configured to acquire the transmittance of the liquid crystal panel of the display to be measured, the effective display area size of the liquid crystal panel, and the light-emitting parameters of the backlight light-emitting unit; the light-emitting parameters include the lumen value corresponding to the light-emitting level of the backlight light-emitting unit; A search module 603, configured to search for the first brightness gain coefficient of the film structure, the conversion coefficient of the backlight light-emitting unit, the light-emitting efficiency of the backlight light-emitting unit, and the second brightness gain coefficient corresponding to the bonding process from a pre-constructed optical influence factor database; wherein, the conversion coefficient is the conversion coefficient between the lumen value and the luminous intensity; A calculation module 604, configured to calculate the backlight brightness value of the display to be measured according to the effective display area size of the liquid crystal panel, the light-emitting parameters of the backlight light-emitting unit, the first brightness gain coefficient of the film structure, the conversion coefficient, and the light-emitting efficiency; An evaluation module 605, configured to calculate an optical brightness evaluation index of the display to be measured according to the backlight brightness value, the transmittance of the liquid crystal panel, and the second brightness gain coefficient, so as to evaluate the optical brightness of the display to be measured according to the optical brightness evaluation index.

[0076] In an embodiment of the present application, the optical brightness evaluation index includes the brightness value of the touch panel module. The evaluation module is configured to: calculate the brightness value of the liquid crystal display module of the display to be measured according to the backlight brightness value and the transmittance of the liquid crystal panel; calculate the brightness value of the touch panel module of the display to be measured according to the brightness value of the liquid crystal display module and the second brightness gain coefficient.

[0077] In an embodiment of the present application, the light-emitting parameters include the number of backlight light-emitting units and the current value corresponding to the backlight light-emitting unit.

[0078] In an embodiment of the present application, the lumen value includes a typical lumen value, and the current value includes a typical current value and a minimum current value. The calculation module is configured to: calculate a first product value among the typical lumen value, the number of backlight light-emitting units, the minimum current value, the conversion coefficient, the light-emitting efficiency, and the first brightness gain coefficient; calculate a second product value between the luminous area corresponding to the effective display area size and the typical current value; calculate the ratio between the first product value and the second product value to obtain the typical value of the backlight brightness; determine the backlight brightness value according to the typical value of the backlight brightness.

[0079] In an embodiment of the present application, the backlight brightness value is the typical value of the backlight brightness. The evaluation module is configured to: calculate the product between the typical value of the backlight brightness and the transmittance of the liquid crystal panel to obtain the typical brightness value of the liquid crystal display module; determine the brightness value of the liquid crystal display module according to the typical brightness value of the liquid crystal display module.

[0080] In the embodiment of the present application, the brightness value of the liquid crystal display module is the typical brightness value of the liquid crystal display module, and the brightness value of the touch panel module includes the minimum brightness value of the touch panel module. The evaluation module is configured to: calculate the product of the typical brightness value of the liquid crystal display module and the second brightness gain coefficient to obtain the typical brightness value of the touch panel module; obtain the third brightness gain coefficient, where the third brightness gain coefficient is the brightness gain coefficient between the typical brightness value and the minimum brightness value of the touch panel module; calculate the minimum brightness value of the touch panel module according to the third brightness gain coefficient and the typical brightness value of the touch panel module.

[0081] In the embodiment of the present application, the optical brightness evaluation index further includes the minimum brightness value of the touch panel module under the white balance specification. The brightness value of the touch panel module includes the typical brightness value. The evaluation module is further configured to: obtain the white balance specification of the display to be measured to determine the fourth brightness gain coefficient corresponding to the white balance specification; calculate the product of the typical brightness value of the touch panel module and the fourth brightness gain coefficient to obtain the typical brightness value of the touch panel module under the white balance specification; obtain the fifth brightness gain coefficient, where the fifth brightness gain coefficient is the gain coefficient between the typical brightness value and the minimum brightness value of the touch panel module under the white balance specification; calculate the product of the fifth brightness gain coefficient and the typical brightness value of the touch panel module under the white balance specification to obtain the minimum brightness value of the touch panel module under the white balance specification.

[0082] In summary, for the optical brightness evaluation device of the liquid crystal display proposed in the embodiments of the present application, for each display to be tested, first determine the film stack structure, the adopted bonding process, and the selected backlight light-emitting unit of the display to be tested. At the same time, obtain the transmittance of the liquid crystal panel of the display to be tested, the effective display area size of the liquid crystal panel, and the light-emitting parameters of the backlight light-emitting unit. Then, look up the first brightness gain coefficient of the above film stack structure, the conversion coefficient of the backlight light-emitting unit, the light-emitting efficiency of the backlight light-emitting unit, and the second brightness gain coefficient corresponding to the above bonding process from the pre-constructed optical influence factor database. Finally, combine the above parameters to first calculate the backlight brightness value of the display to be tested, and then determine the optical brightness evaluation index of the display to be tested based on the backlight brightness value, so as to evaluate the optical brightness of the display to be tested according to the optical brightness evaluation index. In this way, a method for automatic optical brightness evaluation is proposed. By storing the gain coefficients, conversion coefficients, light-emitting efficiencies, etc. measured in advance for different types of light-emitting units and different film stack structures in the database, it is convenient to meet the optical brightness simulation requirements of different displays to be tested. Thus, when evaluating the optical brightness of the display to be tested, only the user needs to provide the personalized parameters of the display to be tested, such as the selected film stack structure, the adopted bonding process, the selected light-emitting unit, the transmittance and effective display area set for the liquid crystal panel, and the light-emitting parameters of the backlight light-emitting unit, etc., to automatically simulate the optical brightness of the display to be tested and achieve the evaluation of the optical brightness of the display to be tested. Compared with the optical brightness evaluation based on experience, the evaluation accuracy of the present application is higher and the time consumption is shorter.

[0083] To implement the above embodiments, the embodiments of the present application also propose an electronic device 700, including a memory 701, a processor 702, and a computer program stored on the memory and executable on the processor. When the processor executes the computer program, the steps of the optical brightness evaluation method of the liquid crystal display in the above embodiments are implemented.

[0084] To implement the above embodiments, the embodiments of the present application also propose a computer-readable storage medium, on which a computer program is stored, and when the program is executed by the processor, the steps of the optical brightness evaluation method of the liquid crystal display are implemented.

[0085] Those of ordinary skill in the art can understand that all or part of the processes in the methods of the above embodiments can be completed by instructing relevant hardware through a computer program. The computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above methods. Among them, any reference to a memory, storage, database, or other medium used in the embodiments provided in the present application can include non-volatile and / or volatile memories. Non-volatile memories can include read-only memory (ROM), programmable ROM (PROM), electrically programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM), or flash memory. Volatile memories can include random access memory (RAM) or external cache memory. By way of illustration and not limitation, RAM is available in many forms, such as static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double data rate SDRAM (DDR SDRAM), enhanced SDRAM (ESDRAM), synchronous link DRAM (SLDRAM), Rambus direct RAM (RDRAM), direct memory bus dynamic RAM (DRDRAM), and Rambus dynamic RAM (RDRAM), etc.

[0086] Those skilled in the art can clearly understand that, for the convenience and simplicity of description, only the above-mentioned division of each functional unit and module is used as an example. In actual applications, the above functions can be allocated to different functional units and modules according to needs, that is, the internal structure of the device can be divided into different functional units or modules to complete all or part of the functions described above.

[0087] The above embodiments are only used to illustrate the technical solutions of the present application, not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application, and should all be included in the protection scope of the present application.

Claims

1. A method for evaluating the optical brightness of a liquid crystal display, characterized in that: The method comprises: Determine the film structure of the display to be tested, the bonding process used by the display to be tested, and the backlight unit of the display to be tested; Obtaining the transmittance of the liquid crystal panel of the display to be tested, the size of the effective display area of ​​the liquid crystal panel, and the luminous parameters of the backlight source light-emitting unit; the luminous parameters include the lumen value corresponding to the luminous level of the backlight source light-emitting unit; Searching the first brightness gain coefficient of the film structure, the conversion coefficient of the backlight source light-emitting unit, the luminous efficiency of the backlight source light-emitting unit, and the second brightness gain coefficient corresponding to the bonding process from a pre-constructed optical impact factor database; wherein the conversion coefficient is a conversion coefficient of lumen value and luminous intensity; Calculating the backlight brightness value of the display to be tested according to the effective display area size of the liquid crystal panel, the luminous parameters of the backlight source light-emitting unit, the first brightness gain coefficient of the film structure, the conversion coefficient and the luminous efficiency; The optical brightness evaluation index of the display to be tested is calculated according to the backlight brightness value, the transmittance of the liquid crystal panel and the second brightness gain coefficient, so as to evaluate the optical brightness of the display to be tested according to the optical brightness evaluation index.

2. The method according to claim 1, characterized in that The optical brightness evaluation index includes a brightness value of a touch panel module, and the optical brightness evaluation index of the display to be tested is calculated according to the backlight brightness value, the transmittance of the liquid crystal panel and the second brightness gain coefficient, including: Calculating the brightness value of the liquid crystal display module of the display to be tested according to the backlight brightness value and the transmittance of the liquid crystal panel; The brightness value of the touch panel module of the display to be tested is calculated according to the brightness value of the liquid crystal display module and the second brightness gain coefficient.

3. The method according to claim 1, characterized in that The light-emitting parameters include the number of the backlight source light-emitting units and the current values ​​corresponding to the backlight source light-emitting units.

4. The method according to claim 3, characterized in that The lumen value includes a typical lumen value, the current value includes a typical current value and a minimum current value, and the backlight brightness value of the display to be tested is calculated according to the effective display area size of the liquid crystal panel, the luminous parameters of the backlight source light-emitting unit, the first brightness gain coefficient of the diaphragm structure, the conversion coefficient and the luminous efficiency, including: Calculating a first product value among the typical lumen value, the number of the backlight source light-emitting units, the minimum current value, the conversion coefficient, the luminous efficiency and the first brightness gain coefficient; Calculating a second product value between the light emitting area corresponding to the size of the effective display area and the typical current value; Calculating a ratio between the first product value and the second product value to obtain a typical value of the backlight brightness; The backlight brightness value is determined according to the typical value of the backlight brightness.

5. The method according to claim 2, characterized in that: The backlight brightness value is a typical value of the backlight brightness; and calculating the brightness value of the liquid crystal display module of the display to be tested according to the backlight brightness value and the transmittance of the liquid crystal panel includes: Calculating the product of the typical value of the backlight brightness and the transmittance of the liquid crystal panel to obtain the typical value of the brightness of the liquid crystal display module; The brightness value of the liquid crystal display module is determined according to the typical brightness value of the liquid crystal display module.

6. The method according to claim 2, characterized in that The brightness value of the liquid crystal display module is a typical brightness value of the liquid crystal display module, the brightness value of the touch panel module includes a minimum brightness value of the touch panel module, and the brightness value of the touch panel module of the display to be tested is calculated according to the brightness value of the liquid crystal display module and the second brightness gain coefficient, including: Calculating the product of the typical brightness value of the liquid crystal display module and the second brightness gain coefficient to obtain the typical brightness value of the touch panel module; Acquire a third brightness gain coefficient, where the third brightness gain coefficient is a brightness gain coefficient between a typical brightness value and a minimum brightness value of the touch panel module; The minimum brightness value of the touch panel module is calculated according to the third brightness gain coefficient and the typical brightness value of the touch panel module.

7. The method according to claim 2, characterized in that The optical brightness evaluation index also includes a minimum brightness value of the touch panel module under the white balance specification, and the brightness value of the touch panel module includes a typical brightness value of the touch panel module. After calculating the brightness value of the touch panel module of the display to be tested according to the brightness value of the liquid crystal display module and the second brightness gain coefficient, the method further includes: Acquire the white balance specification of the display to be tested to determine a fourth brightness gain coefficient corresponding to the white balance specification; Calculating the product of the typical brightness value of the touch panel module and the fourth brightness gain coefficient to obtain the typical brightness value of the touch panel module under the white balance specification; Acquire a fifth brightness gain coefficient, where the fifth brightness gain coefficient is a gain coefficient between a typical brightness value and a minimum brightness value of the touch panel module under the white balance specification; The product of the fifth brightness gain coefficient and the typical brightness value of the touch panel module under the white balance specification is calculated to obtain the minimum brightness value of the touch panel module under the white balance specification.

8. An optical brightness evaluation device for a liquid crystal display, characterized in that: The device comprises: A determination module, used to determine the film structure of the display to be tested, the bonding process used by the display to be tested, and the backlight source light-emitting unit of the display to be tested; An acquisition module, used to acquire the transmittance of the liquid crystal panel of the display to be tested, the size of the effective display area of ​​the liquid crystal panel, and the luminous parameters of the backlight luminous unit; the luminous parameters include the lumen value corresponding to the luminous level of the backlight luminous unit; A search module, used to search the first brightness gain coefficient of the film structure, the conversion coefficient of the backlight source light-emitting unit, the luminous efficiency of the backlight source light-emitting unit and the second brightness gain coefficient corresponding to the bonding process from a pre-constructed optical impact factor database; wherein the conversion coefficient is a conversion coefficient of lumen value and luminous intensity; A calculation module, used for calculating the backlight brightness value of the display to be tested according to the effective display area size of the liquid crystal panel, the luminous parameters of the backlight source light-emitting unit, the first brightness gain coefficient of the diaphragm structure, the conversion coefficient and the luminous efficiency; An evaluation module is used to calculate an optical brightness evaluation index of the display to be tested according to the backlight brightness value, the transmittance of the liquid crystal panel and the second brightness gain coefficient, so as to evaluate the optical brightness of the display to be tested according to the optical brightness evaluation index.

9. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein: When the processor executes the computer program, the steps of the method for evaluating the optical brightness of a liquid crystal display according to any one of claims 1 to 7 are implemented.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the program is executed by a processor, the steps of the method for evaluating the optical brightness of a liquid crystal display according to any one of claims 1 to 7 are implemented.

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