A lamp strip arrangement method and device of a direct type backlight module and a storage medium
By optimizing the ratio of row spacing, column spacing, and corner LEDs to the LEDs, and adjusting the scaling factor to optimize the LED strip arrangement, the problem of insufficient edge optical quality in direct-lit backlight modules was solved, achieving more efficient LED utilization and cost reduction.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- SHENZHEN KTC TECH CO LTD
- Filing Date
- 2022-12-26
- Publication Date
- 2026-06-05
AI Technical Summary
In existing technologies, the arrangement of LED strips in direct-lit backlight modules involves complex calculations and makes it difficult to guarantee the optical quality of the module edges. Furthermore, the effects of diffuser plates and films are not considered, resulting in unreasonable spacing between LEDs and waste.
By determining the proportional relationship between the row spacing and column spacing of the LEDs and the LEDs at the top corner, the proportional coefficients are adjusted to obtain LED pre-arrangement data that meets the preset conditions. Combined with optical quality testing, the LED arrangement is optimized.
It effectively improves the optical quality of the backlight module's edge area, increases the utilization rate of LED chips, reduces costs, and enhances the overall optical quality of the module.
Smart Images
Figure CN116300194B_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of backlight module technology, and in particular to a method, apparatus and storage medium for arranging LED strips in a direct-lit backlight module. Background Technology
[0002] In a direct-lit backlight module, LED strips are located on a PCB board. Lenses on the LEDs diffuse the light, which travels a certain mixing distance to reach the diffuser plate, and then is diffused again by a diaphragm to achieve uniform light emission. Direct-lit backlight modules typically use white LED strips, which often result in uneven light mixing.
[0003] The arrangement of LED strips in a direct-lit LED LCD backlight module is generally determined by the module's brightness specifications, the transmittance of the glass and diffuser, the gain coefficients of various films, the luminous flux of a single LED, and the height of the internal cavity of the backlight module. Simultaneously, based on the emission angles of the LEDs and lenses, and the intensity distribution of the illuminated surface, the distances between the LEDs and between the LEDs and the backplate frame are continuously adjusted to ensure that the point light sources from the LEDs at the bottom of the backplate form a uniformly distributed surface light source at the top of the mixing cavity. During the development of the backlight module, the arrangement of the LED strips needs to consider many factors, and its rationality directly affects the final quality of the product.
[0004] Current backlight module LED strip arrangement technologies require calculating the illuminance distribution function of the target illumination surface based on the spatial distribution of LED luminous intensity at different emission angles. Then, the critical uniform illumination condition value is calculated using the Sparrow criterion. Finally, simulations or experiments using Lighttools software are used to verify whether a uniform surface light source can be obtained. However, this technology is computationally complex, requiring the establishment of corresponding spatial distribution functions for LEDs at different emission angles. Furthermore, this approach only focuses on the periodic illumination of the central part of the backlight module, neglecting the edge areas, making it difficult to guarantee good optical quality at the module edges. Finally, this technology does not consider the role of various films and diffusers, while actual backlight module designs use diffusers and films to shield or diffuse the light shadows. The LED spacing calculated by this technology is often much smaller than the actual LED spacing, resulting in wasted LEDs. Summary of the Invention
[0005] This application provides a method, apparatus, and storage medium for arranging LED strips in a direct-lit backlight module, which can effectively improve the optical quality of the edge portion of the backlight module.
[0006] This application provides a method for arranging LED strips in a direct-lit backlight module, including:
[0007] Obtain the number of LED strips in the backlight module and the size of the LED strip arrangement area;
[0008] A first proportional relationship is determined between the row spacing of the LEDs in the backlight module and the row margin of the top corner LEDs, and a second proportional relationship is determined between the column spacing of the LEDs in the backlight module and the column margin of the top corner LEDs, wherein the first proportional relationship and the second proportional relationship include the same proportional coefficient.
[0009] Based on the number of light strips and the size, the proportional coefficient is adjusted to obtain the first difference between the row spacing and column spacing of the light beads;
[0010] Based on the first difference, LED bead pre-arrangement data that meets the preset conditions is obtained. The LED bead pre-arrangement data includes: row spacing and column spacing of LED beads, and row margin and column margin of top corner LED beads.
[0011] The pre-arrangement data of the LED beads is tested to obtain the target LED bead arrangement data.
[0012] Furthermore, the number of light strips includes: the number of rows of light strips and the number of columns of light strips;
[0013] The number of LED strips in the backlight module is obtained as follows:
[0014] The total number of LEDs in the backlight module is determined based on the brightness uniformity of the backlight module.
[0015] The total number of LED beads is divided based on the size of the LED strip arrangement area of the backlight module to determine the number of rows and columns of LED strips in the backlight module.
[0016] Furthermore, determining the total number of LEDs in the backlight module based on the brightness uniformity of the backlight module includes:
[0017] According to the preset module brightness formula: Determine the total number of LEDs in the backlight module. ;
[0018] Among them, the The module brightness of the backlight module is expressed in candela per square meter; The luminous flux of a single LED in the backlight module is expressed in lumens; This is an empirical coefficient, with a value ranging from 0.32 to 0.42; The transmittance of the diffuser plate; The gain of each diaphragm; The transmittance of the glass; The effective light-emitting area of the glass is expressed in square meters; The brightness uniformity of the backlight module.
[0019] Furthermore, determining the first proportional relationship between the row spacing of the LEDs in the backlight module and the row margin of the top corner LEDs, and the second proportional relationship between the column spacing of the LEDs in the backlight module and the column margin of the top corner LEDs, includes:
[0020] It is determined that there is a first proportional relationship between the row spacing of the LEDs in the backlight module and the row margin of the top corner LEDs: x=λA1;
[0021] It is determined that there is a second proportional relationship between the column spacing of the LEDs in the backlight module and the column edge distance of the top corner LEDs: y=λA2;
[0022] Wherein, λ is the proportionality coefficient, λ≥1; x is the row spacing of the LED beads, A1 is the row margin of the top corner LED beads, y is the column spacing of the LED beads, and A2 is the column margin of the top corner LED beads.
[0023] Furthermore, adjusting the proportional coefficient based on the number and size of the light strips to obtain the first difference between the row spacing and column spacing of the LED beads includes:
[0024] In the preset function as well as In this process, the proportional coefficient λ is selected according to a preset order to obtain the first difference ∆ between the row spacing x and column spacing y of the LED beads; wherein, the The length of the dimension, the The width of the stated dimension, the The radius of the lens, the The number of rows of light strips in the stated number of light strips, the This refers to the number of columns of the light strips in the stated number of light strips.
[0025] Furthermore, obtaining the pre-arrangement data of the LED beads that meets the preset conditions based on the first difference includes:
[0026] Calculate the second difference between two adjacent sets of first differences ∆ in the preset order;
[0027] Determine whether the second difference is less than a preset threshold;
[0028] If not, return to the step of adjusting the scaling factor to obtain the first difference between the row spacing and column spacing of the LED beads;
[0029] If so, the arrangement data of the two adjacent groups will be used as the pre-arrangement data of the LED beads that meet the preset conditions.
[0030] Furthermore, the method also includes:
[0031] The spacing range of the LEDs in the backlight module is determined according to the preset LED boundary calculation method;
[0032] Determine whether the row spacing and column spacing of the LEDs corresponding to the target LED arrangement data are both within the spacing range of the LEDs;
[0033] If so, the row spacing and column spacing of the corresponding LED beads will be used as the target row spacing and target column spacing of the LED beads.
[0034] This application embodiment also provides a display device, which is equipped with LED beads. The distribution of the LED beads is obtained by the LED strip arrangement method of a direct-lit backlight module as described above, and the number of LED beads conforms to the empirical coefficient C with a value of 0.32-0.42.
[0035] Furthermore, the row spacing of the LED beads and the row margin of the top corner LED beads have a first proportional relationship, and the column spacing of the LED beads in the backlight module and the column margin of the top corner LED beads have a second proportional relationship. The first proportional relationship and the second proportional relationship include the same proportional coefficient; and the LED beads are evenly distributed.
[0036] This application also provides a computer-readable storage medium including instructions that, when executed on a computer, cause the computer to perform the above-described method.
[0037] As can be seen from the above technical solutions, the embodiments of this application have the following advantages:
[0038] In this embodiment, the number of LED strips and the size of the LED strip arrangement area in the backlight module are obtained; the proportional relationship between the row spacing and column spacing of the LEDs in the backlight module and the row margin and column spacing of the top corner LEDs is determined; based on the number and size of the LED strips, the proportional coefficient is adjusted to obtain the first difference between the row spacing and column spacing of the LEDs; based on the first difference, LED pre-arrangement data that meets preset conditions is obtained, including: the row spacing and column spacing of the LEDs, and the row margin and column margin of the top corner LEDs; the LED pre-arrangement data is tested to obtain the target LED arrangement data. This solution effectively improves the optical quality of the edge part of the backlight module by adjusting the proportional coefficient and obtaining the target LED arrangement data based on the first difference between the row spacing and column spacing of the LEDs. Attached Figure Description
[0039] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments recorded in this application. For those skilled in the art, other drawings can be obtained based on these drawings.
[0040] Figure 1 This is a flowchart illustrating the LED strip arrangement of a backlight module disclosed in an embodiment of this application.
[0041] Figure 2 This is a flowchart of the LED strip arrangement for another backlight module disclosed in an embodiment of this application;
[0042] Figure 3 This is a schematic diagram of the LED strip arrangement of a backlight module disclosed in an embodiment of this application;
[0043] Figure 4 This is a schematic diagram showing the spacing of multiple LED beads at a preset ratio, as disclosed in an embodiment of this application.
[0044] Figure 5 This is a schematic diagram illustrating the spacing range of a single LED bead as disclosed in an embodiment of this application.
[0045] Figure 6 This is a diagram of a backlight module light strip arrangement device disclosed in an embodiment of this application;
[0046] Figure 7 This is a diagram of the light strip arrangement device for another backlight module disclosed in an embodiment of this application. Detailed Implementation
[0047] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present application.
[0048] In the description of the embodiments of this application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.
[0049] In the description of the embodiments of this application, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this application based on the specific circumstances.
[0050] Example 1:
[0051] Current backlight module LED strip arrangement techniques calculate the illuminance distribution function of the target illumination surface based on different emission angles, and then use software simulation or experiments to verify whether a uniform surface light source can be obtained. However, this technique is computationally complex, requiring the establishment of corresponding luminous intensity spatial distribution functions for LEDs at different emission angles. Furthermore, this technique only focuses on the periodic illumination of the central part of the backlight module, neglecting the edge areas, making it difficult to guarantee good optical quality at the module edges. Finally, this technique does not consider the effects of various films and diffusers, while actual backlight module designs use diffusers and films to shield or diffuse the light shadows. The calculated LED spacing in this technique is often much smaller than the actual LED spacing, resulting in wasted LEDs. Therefore, this application provides an LED strip arrangement method for a direct-lit backlight module, which can effectively improve the optical quality of the backlight module edges, such as... Figure 1 As shown, the specific steps are as follows:
[0052] 101. Obtain the number of LED strips in the backlight module and the size of the LED strip arrangement area.
[0053] In this embodiment, the LED strip arrangement device can determine the number of LED strips in the backlight module and the size of the LED strip arrangement area. Specifically, it can determine the total number of LEDs required in the backlight module and the size of the LED strip arrangement area in the backlight module. The LED strip arrangement area can include the long side and the short side of the LED strip arrangement area. It can determine the number of rows corresponding to the arrangement of LEDs along the long side of the LED strip arrangement area and the number of columns corresponding to the arrangement of LEDs along the short side of the LED strip arrangement area, and use the number of rows corresponding to the arrangement along the long side and the number of columns corresponding to the arrangement along the short side as the number of LED strips in the backlight module.
[0054] 102. Determine the proportional relationship between the row spacing and column spacing of the LEDs in the backlight module and the row and column margins of the top corner LEDs.
[0055] It is understandable that the distance between the LEDs and the backplate in the LED strip arrangement (i.e., the distance between the corner LEDs and the edge of the backlight module) directly affects the optical quality of the backlight module's frame. An unreasonable distance design can easily lead to uneven transitions such as bright edges or dark frames. In this embodiment, through analysis of extensive LED strip arrangement data in backlight modules, the proportional relationships between the row spacing and column spacing of the LEDs in the backlight module and the row and column margins of the corner LEDs are determined. Specifically, a first proportional relationship between the row spacing and the row margin of the corner LEDs in the backlight module, and a second proportional relationship between the column spacing and the column margin of the corner LEDs in the backlight module are determined. Both the first and second proportional relationships include the same proportional coefficient. It is understood that corner LEDs refer to the LEDs corresponding to the corners of the LED strip arrangement area in the backlight module. For example, when the LED strip arrangement area is rectangular, the LEDs arranged at the four corners of the rectangular area are the corner LEDs. Wherein, the row margin and column margin are the distances of the top corner LED beads from the edge of the backlight module in the vertical and horizontal directions, respectively; that is, the row margin is the distance of the top corner LED beads from the edge of the LED strip arrangement area in the vertical direction, and the column margin is the distance of the top corner LED beads from the edge of the LED strip arrangement area in the horizontal direction. The vertical direction is the direction of the row arrangement of LED beads, and the horizontal direction is the direction of the column arrangement of LED beads.
[0056] 103. Based on the number and size of the LED strips, adjust the proportional coefficient of the proportional relationship to obtain the first difference between the row spacing and column spacing of the LED beads.
[0057] Once the proportional relationship between the row and column spacing of the LEDs in the backlight module and the row and column margins of the top corner LEDs is determined, the proportional coefficient of this relationship can be adjusted according to the number and size of the LED strips to obtain the first difference between the row and column spacing of the LEDs. It is understood that this proportional relationship refers to the aforementioned first and second proportional relationships, both of which include the same proportional coefficient. Based on the number of LED strips and the size of the LED strip arrangement area, a corresponding LED spacing function can be obtained. This spacing function includes the proportional coefficient, and it can determine the row and column margins of the top corner LEDs. Furthermore, the row and column spacing of the LEDs can be obtained based on the proportional relationship. When the proportional coefficient of this relationship is adjusted, the row and column spacing of the LEDs will also be adjusted accordingly, resulting in the first difference between the row and column spacing of the corresponding LEDs.
[0058] 104. Based on the first difference, obtain the pre-arrangement data of the LED beads that meet the preset conditions.
[0059] Once the first difference between the row spacing and column spacing of the LEDs is obtained, the pre-arrangement data of the LEDs that meets the preset conditions can be obtained based on this first difference. It can be understood that after each adjustment of the scaling factor, the row spacing and column spacing of the LEDs are compared to obtain the difference. Generally, to make the row margin of the top corner LED as close as possible to the row spacing of the LEDs, and the column margin of the top corner LED as close as possible to the column spacing of the LEDs, the scaling factor is set to 1. This yields the difference between the row spacing and column spacing of the corresponding LEDs. Then, the scaling factor is gradually increased until the difference between the row spacing and column spacing of the LEDs meets the preset threshold relationship. This results in the pre-arrangement data of the LEDs that meets the preset conditions. This pre-arrangement data includes: the row spacing and column spacing of the LEDs, and the row margin and column margin of the top corner LEDs. It is understandable that the difference between the row spacing and column spacing of the LED beads satisfying the preset threshold relationship means that after adjusting the preset ratio, the difference between the row spacing and column spacing obtained is compared with a difference obtained from the previous adjustment of the preset ratio. If the difference between the two is less than the preset threshold, it can be determined that the preset threshold relationship is satisfied. When the preset threshold relationship is satisfied, the corresponding ratio coefficient and the corresponding row and column margins of the top corner LED beads can be obtained. The row and column margins are selected as the target row margin and target column margin.
[0060] It is understandable that, because there is a first proportional relationship between the row spacing of the LEDs and the row margin of the top corner LEDs in the backlight module, and a second proportional relationship between the column spacing of the LEDs and the column margin of the top corner LEDs, and both the first and second proportional relationships include the same proportional coefficient; when the difference between the row spacing and column spacing of the LEDs meets a preset threshold, the row and column margins of the top corner LEDs are also less than the preset threshold, that is, the row and column margins of the top corner LEDs are relatively close. This preset threshold can be 0.2mm or 0.3mm, and no lower limit is specified here. In order to make the row and column margins as close as possible or the same, this preset threshold should not be too large. That is, the optimal solution is that the row and column margins are equal, at which point the row spacing and column spacing of the LEDs are also equal.
[0061] 105. Test the pre-arrangement data of the LED beads to obtain the target LED bead arrangement data.
[0062] After obtaining the pre-arrangement data of the LEDs that meets the preset conditions, this pre-arrangement data generally includes two sets of data: the row spacing and column spacing of the LEDs, and the row and column margins of the top corner LEDs. At this point, the pre-arrangement data needs to be tested to obtain the target LED arrangement data. Using the row and column spacing of the LEDs, as well as the row and column margins of the top corner LEDs, from the pre-arrangement data, the LEDs are arranged, and then the optical quality is tested. The set of pre-arrangement data with better optical quality is selected as the target LED arrangement data.
[0063] As can be seen, in this embodiment, the number of LED strips and the size of the LED strip arrangement area in the backlight module are obtained; the proportional relationship between the row spacing and column spacing of the LEDs in the backlight module and the row margin and column spacing of the top corner LEDs is determined; based on the number and size of the LED strips, the proportional coefficient is adjusted to obtain the first difference between the row spacing and column spacing of the LEDs; based on the first difference, LED pre-arrangement data that meets preset conditions is obtained, the LED pre-arrangement data including: the row spacing and column spacing of the LEDs, and the row margin and column margin of the top corner LEDs; the LED pre-arrangement data is tested to obtain the target LED arrangement data. This solution effectively improves the optical quality of the edge part of the backlight module by adjusting the proportional coefficient and obtaining the target LED arrangement data based on the first difference between the row spacing and column spacing of the LEDs.
[0064] Example 2:
[0065] The following will provide a detailed explanation of the LED strip arrangement method for the backlight module, such as... Figure 2 As shown, the specific steps are as follows:
[0066] 201. Determine the total number of LEDs in the backlight module based on the brightness uniformity of the backlight module.
[0067] In this embodiment, the total number of LEDs in the backlight module can be determined based on the brightness uniformity of the backlight module. Specifically, it can be determined according to a preset module brightness formula: Determine the total number of LEDs in the backlight module. ;in, The module brightness of the backlight module is expressed in candela per square meter (cd / m2). The luminous flux of a single LED in the backlight module is expressed in lumens (lm). This is an empirical coefficient, with a value ranging from 0.32 to 0.42. The transmittance of the diffuser plate; For the gain of each diaphragm; The transmittance of the glass; The effective light-emitting area of the glass is expressed in square meters. This refers to the brightness uniformity of the backlight module. It is understood that, in the embodiments of this application, the brightness uniformity of the backlight module... Determining the total number of LEDs in the backlight module allows for a more reasonable distribution of LEDs and more uniform brightness.
[0068] Taking an 86-inch TV as an example: The user requires a brightness of 450 nits. The effective light-emitting area of the glass is 2.018 m². The transmittance of the glass and diffuser is 6.15% and 45% respectively. The brightness of a single LED is 160 lm, the gain of the diaphragm is 2.34, and the brightness uniformity of the module is 80%. Substituting these coefficients into the preset module brightness formula, we get: N≈189, meaning the total number of LEDs in the backlight module is 189.
[0069] 202. Divide the total number of LED beads to determine the number of rows and columns of LED strips in the backlight module.
[0070] It's understandable that the number of LED strips includes both the number of rows and columns. After determining the total number of LEDs in the backlight module based on its brightness uniformity, the total number of LEDs can be further divided based on the LED strip arrangement area size to determine the number of horizontal rows and vertical columns of the LED strips. In other words, the required total number of LEDs and LED strips can be determined based on the user's desired backlight module brightness and the corresponding device size (LED strip arrangement area), combined with the transmittance of the selected glass and diffuser, the gain coefficient of each diaphragm, and the luminous flux of a single LED. For example, if the backlight module has an 86-inch backplate and a total of 189 LEDs, the horizontal arrangement of the LED strips can be determined to be 10 rows and the vertical arrangement to be 18 columns, i.e., a 10×18Bar arrangement.
[0071] 203. A preset function is obtained based on the number of rows and columns of the light strips, the size of the light strip layout area, and the preset proportional relationship.
[0072] In this embodiment, a preset function is obtained based on the number of rows and columns of the LED strip, the size of the LED strip arrangement area, and a preset proportional relationship. Specifically, a first proportional relationship is determined between the row spacing of the LEDs in the backlight module and the row margin of the top corner LEDs: x = λA1; a second proportional relationship is determined between the column spacing of the LEDs in the backlight module and the column margin of the top corner LEDs: y = λA2, where λ is a proportionality coefficient, λ ≥ 1; x is the row spacing of the LEDs, A1 is the row margin of the top corner LEDs, y is the column spacing of the LEDs, and A2 is the column margin of the top corner LEDs. When the horizontal direction in the LED strip arrangement area corresponds to the long side L of the LED strip arrangement area (i.e., the horizontal direction is the row direction), and the vertical direction corresponds to the short side M of the LED strip arrangement area (i.e., the vertical direction is the column direction), as shown... Figure 3 As shown, at this point, the column spacing and row spacing of the LED beads are determined to be λ times the distance from the LED beads at the four corners of the LED strip arrangement area to the wide side and long side.
[0073] right Figure 3 Geometric analysis can yield the preset LED spacing functions corresponding to the horizontal spacing (row spacing) and vertical spacing (column spacing) of the LEDs:
[0074] as well as Based on x=λA1, y=λA2, and the preset LED spacing function, the preset function is obtained:
[0075] as well as ;in, This refers to the horizontal length of the LED strip arrangement area in the backlight module, i.e., the long side of the LED strip arrangement area. This refers to the width of the LED strip arrangement area in the backlight module in the vertical direction, i.e., the shorter side of the LED strip arrangement area. Let be the radius of the lens. This represents the number of rows in which the light strips are arranged horizontally. This represents the number of vertical columns of the light strips. In this case, the light strip arrangement area is rectangular. A2 can be understood as the distance from the LEDs at the four corners of the light strip arrangement area to the long side, and A1 can be understood as the distance from the LEDs at the four corners of the light strip arrangement area to the wide side.
[0076] 204. In the preset function, select the proportional coefficient according to the preset order to obtain the first difference between the row spacing and column spacing of the LED beads.
[0077] After constructing the preset function, the scaling factor is selected according to the preset order within the preset function to obtain the first difference between the row spacing and column spacing of the LED beads; in order to... The value should be as small as possible, that is, the difference between the row margin and column margin of the top corner LED should be as small as possible. It can be taken as... At this point, A=A1=A2. Substituting into the preset function, we know that the column spacing x and row spacing y of the LED beads should also be as small as possible. This allows us to obtain an LED strip arrangement where the distances from the LED beads at the four corners of the LED strip arrangement area to the long and wide sides are equal, which can effectively improve the optical quality and uneven brightness around the direct-lit backlight module.
[0078] Specifically, the dimensions of the LED strip arrangement area of the backlight module can be obtained. and ), mixing height h, number of light strips, lens diameter (2r) corresponding to the LED beads, etc., will , , , as well as Substitute the vertical spacing function and the horizontal spacing function; select the same proportional coefficient in the preset function according to the preset order, calculate the row margin A1 and column margin A2 of the top corner LED, and obtain the first difference between the corresponding row spacing x and column spacing y of the LED. .
[0079] 205. Calculate the second difference between the first differences of two adjacent groups in the preset order to obtain the LED bead pre-arrangement data that meets the preset conditions.
[0080] Calculate the first difference between two adjacent groups in a preset order. The second difference is determined; it is then checked whether the second difference is less than a preset threshold; if not, the process returns to the step of adjusting the scaling factor to obtain the first difference between the row spacing and column spacing of the LEDs, i.e., the scaling factor is adjusted again; if so, the arrangement data of the two adjacent groups are used as the LED pre-arrangement data that meets the preset conditions. That is, after each adjustment of the scaling factor, the first difference between the two adjacent groups in the preset order is calculated. The second difference, until two adjacent sets of the first difference in a preset order. When the difference is less than a preset threshold, the pre-arrangement data of the LED beads that meet the preset conditions is obtained.
[0081] When the length (L) and width (M) of the LED strip arrangement area are 1753.4 mm and 926.5 mm respectively, the mixing height (h) is 35 mm, the number of LED strips is 18 columns (a=18) and 10 rows (b=10), and the lens diameter is 19 mm, substituting the above data into the preset function, and assuming λ is a natural number, we can obtain, as follows: Figure 4 The data shown includes: row margin A1, column margin A2, row spacing x and column spacing y of the LED beads; λ is taken as a natural number (pre-selected from 1 to 10), and a scaling factor λ is selected sequentially based on consecutive positive integers from smallest to largest. It can be understood that this can be achieved through the first difference... Less than the preset threshold, or the first difference between two adjacent rows If the difference is less than a preset threshold, such as 0.2, then a new λ value (proportional coefficient) will not be taken. Based on the current λ value, the corresponding row spacing, column spacing, row margin, and column margin of the top corner LEDs are determined.
[0082] 206. Test the pre-arrangement data of the LED beads to obtain the target LED bead arrangement data.
[0083] It should be noted that step 206 is similar to step 105 above, and will not be described in detail here.
[0084] Preferably, until two adjacent groups of first differences in a preset order. When the difference is less than a preset threshold, the LED bead pre-arrangement data meets the preset conditions. As shown in the figure, when the preset threshold is 0.5 or 0.2, rows 9 and 10... The difference in values is 2.347 - 2.232 = 0.115, which is less than 0.5 or 0.2, so no new λ value is taken. If the preset threshold is 0.5, since the difference between rows 4 and 5 is 0.495, which is less than 0.5, the λ value is 5. If the preset threshold is 0.2, then new λ values need to be taken until rows 9 and 10. The difference in values is less than a preset threshold of 0.2. When the difference ∆ between two adjacent groups is less than the preset threshold, the row margin and column margin of the two adjacent groups can be obtained. For example, if the preset threshold is 0.2, the row margin A1 and column margin A2 of the 9th and 10th rows, and the difference δ between row margin A1 and column margin A2, can be obtained. At this time, the row margin A1 and column margin A2 of the two adjacent groups can be used for testing and observation. The row margin A1 and column margin A with better LED quality can be selected as the target row margin and target column margin, and the corresponding row spacing and column spacing of the LEDs can be determined. The LEDs are arranged on the backlight module using the target row margin, target column margin, and the corresponding row spacing and column spacing of the LEDs.
[0085] 207. Determine whether the row spacing and column spacing of the target LED arrangement data are within the spacing range of the LEDs.
[0086] In this embodiment, it can also be determined whether the row spacing and column spacing of the LEDs corresponding to the target LED arrangement data are both within the LED spacing range. Specifically, the spacing range of the LEDs in the backlight module is determined according to a preset LED boundary calculation method. It can be understood that the ideal state of the LED strip arrangement in the backlight module is to achieve uniform illumination with the minimum mixing distance (mixing height) and the maximum LED spacing. The smaller the mixing distance, the thinner and lighter the overall thickness of the backlight module; the larger the LED spacing, the fewer LEDs are used in the backlight module, and the lower the cost. The mixing distance and LED spacing are related to the light emission angle of the light source corresponding to the LED, such as... Figure 5 As shown. Because the light-emitting area of an LED is small, it can be approximated as a point light source. Let the light intensity of the LED be I = I(θ), its emission angle after passing through the lens be θ, x1 be the maximum distance that the LED can illuminate, and h above the LED bead be the top of the mixing cavity (i.e., the mixing distance h). If we want to obtain a plane with uniform illuminance distribution on the diffuser plate, it should satisfy x1 ≤ htan(θ). Therefore, the maximum distance between the two LED beads is 2L = 2htan(θ). ,so .
[0087] The LED beads typically used in backlight modules have a beam angle of 120°, which can be expanded to 150° through a lens; and the light mixing distance is 35mm, the lens diameter is 19mm, so the range of LED bead spacing (LED bead boundary conditions) can be obtained as: 19≤2L≤261mm.
[0088] The process involves determining whether the row and column spacing of the LEDs corresponding to the target LED arrangement data are within the specified spacing range. Specifically, the row spacing range should be defined as 2r ≤ x ≤ 2htan(θ), and the column spacing range as 2r ≤ y ≤ 2htan(θ). If so, these row and column spacings are used as the target row and column spacings for the LEDs. Essentially, by verifying that the row and column spacings of the LEDs corresponding to the target LED arrangement data are within these ranges, the accuracy of the obtained row and column spacings can be checked.
[0089] As can be seen, this embodiment links the spacing between LED beads and the spacing between the LED beads and the four sides of the LED strip arrangement area, establishing a corresponding LED strip arrangement function. This function can directly calculate the reasonable distance between each LED bead and the backlight module frame, effectively solving the LED strip arrangement problem in direct-lit backlight modules in practical applications and effectively improving the uneven transition of light quality, such as bright edges or dark frames and dark corners around the backlight module. This has significant guiding significance for improving LED bead utilization, reducing backlight module costs, and enhancing the overall optical quality of the module, and has certain practical value.
[0090] Example 3:
[0091] This application provides a light strip arrangement device for a direct-lit backlight module, such as... Figure 6 As shown, it includes:
[0092] Determining unit 601 is used to determine the number of light strips in the backlight module;
[0093] The preset unit 602 is used to set a preset proportional relationship between the vertical spacing of the LED beads in the backlight module and the vertical edge distance of the top corner LED beads, and the same preset proportional relationship between the horizontal spacing of the LED beads and the horizontal edge distance of the top corner LED beads; wherein the vertical edge distance and the horizontal edge distance are the distances of the top corner LED beads from the edge of the backlight module in the vertical direction and the horizontal direction, respectively.
[0094] The construction unit 603 is used to construct the vertical spacing function and the horizontal spacing function of the LED beads based on the number of LED strips and the preset proportional relationship;
[0095] The adjustment unit 604 is used to adjust the preset proportional relationship in the vertical spacing function and the horizontal spacing function until the difference between the vertical edge distance and the horizontal edge distance is less than a preset threshold.
[0096] Example 4:
[0097] This application provides a light strip arrangement device 700 for a direct-lit backlight module, such as... Figure 7 As shown, it includes:
[0098] Central processing unit 701, memory 702, and input / output interface 703;
[0099] The memory 702 is a short-term storage memory or a persistent storage memory;
[0100] The central processing unit 701 is configured to communicate with the memory 702 and execute the instructions in the memory 702 to perform the above-described light strip arrangement method.
[0101] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the specific working processes of the systems, devices, and units described above can be referred to the corresponding processes in the foregoing method embodiments, and will not be repeated here.
[0102] In the several embodiments provided in this application, it should be understood that the disclosed systems, apparatuses, and methods can be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative; for instance, the division of units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection between apparatuses or units through some interfaces, and may be electrical, mechanical, or other forms.
[0103] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.
[0104] Furthermore, the functional units in the various embodiments of this application can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit.
[0105] If the integrated unit is implemented as a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, or all or part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of this application. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.
Claims
1. A method for arranging LED strips in a direct-lit backlight module, characterized in that, include: Obtain the number of LED strips in the backlight module and the size of the LED strip arrangement area; A first proportional relationship is determined between the row spacing of the LEDs in the backlight module and the row margin of the top corner LEDs, and a second proportional relationship is determined between the column spacing of the LEDs in the backlight module and the column margin of the top corner LEDs. Both the first and second proportional relationships include the same proportional coefficient, including: It is determined that there is a first proportional relationship between the row spacing of the LEDs in the backlight module and the row margin of the top corner LEDs: x=λA1; It is determined that there is a second proportional relationship between the column spacing of the LEDs in the backlight module and the column edge distance of the top corner LEDs: y=λA2; Wherein, λ is the proportionality coefficient, λ≥1; x is the row spacing of the LED beads, A1 is the row margin of the top corner LED beads, y is the column spacing of the LED beads, and A2 is the column margin of the top corner LED beads. Based on the number of light strips and the size, the proportional coefficient is adjusted to obtain the first difference between the row spacing and column spacing of the light beads; The step of adjusting the proportional coefficient according to the number and size of the light strips to obtain the first difference between the row spacing and column spacing of the LED beads includes: Based on the number of light strips and the dimensions, the spacing function of the light beads corresponding to the row margin and column margin of the top corner light beads is obtained, and the spacing function includes the proportional coefficient; The spacing function includes: Horizontal spacing function: And the vertical spacing function: ; Where L is the horizontal length of the LED strip arrangement area in the backlight module, i.e., the long side of the LED strip arrangement area; M is the vertical width of the LED strip arrangement area in the backlight module, i.e., the short side of the LED strip arrangement area; r is the radius of the lens; a is the number of rows of horizontally arranged LED strips; b is the number of columns of vertically arranged LED strips; A1 is the row margin of the top corner LED; and A2 is the column margin of the top corner LED. Adjust the proportional coefficient, adjust the row and column margins of the top corner LED beads, and adjust the row and column spacing of the LED beads to obtain the first difference between the row and column spacing of the adjusted LED beads. The step of adjusting the proportional coefficient according to the number and size of the light strips to obtain the first difference between the row spacing and column spacing of the LED beads includes: In the preset function as well as In this process, the proportional coefficient λ is selected according to a preset order to obtain the first difference ∆ between the row spacing x and column spacing y of the LED beads; wherein, the The length of the dimension, the The width of the stated dimension, the The radius of the lens, the The number of rows of light strips in the stated number of light strips, the This refers to the number of columns of the light strips in the stated number of light strips; Based on the first difference, LED bead pre-arrangement data that meets the preset conditions is obtained. The LED bead pre-arrangement data includes: row spacing and column spacing of LED beads, and row margin and column margin of top corner LED beads. The step of obtaining the LED bead pre-arrangement data that meets the preset conditions based on the first difference includes: Calculate the second difference between two adjacent sets of first differences ∆ in the preset order; Determine whether the second difference is less than a preset threshold; If not, return to the step of adjusting the scaling factor to obtain the first difference between the row spacing and column spacing of the LED beads; If so, the arrangement data of the two adjacent groups will be used as the pre-arrangement data of the LED beads that meet the preset conditions; The pre-arrangement data of the LED beads is tested to obtain the target LED bead arrangement data.
2. The method for arranging light strips according to claim 1, characterized in that, The number of light strips includes: the number of rows and columns of light strips; The number of LED strips in the backlight module is obtained as follows: The total number of LEDs in the backlight module is determined based on the brightness uniformity of the backlight module. The total number of LED beads is divided based on the size of the LED strip arrangement area of the backlight module to determine the number of rows and columns of LED strips in the backlight module.
3. The method for arranging light strips according to claim 2, characterized in that, Determining the total number of LEDs in the backlight module based on the brightness uniformity of the backlight module includes: According to the preset module brightness formula: Determine the total number of LEDs in the backlight module. ; Among them, the The module brightness of the backlight module is expressed in candela per square meter; The luminous flux of a single LED in the backlight module is expressed in lumens; This is an empirical coefficient, with a value ranging from 0.32 to 0.42; The transmittance of the diffuser plate; The gain of each diaphragm; The transmittance of the glass; The effective light-emitting area of the glass is expressed in square meters; The brightness uniformity of the backlight module.
4. The method for arranging light strips according to claim 1, characterized in that, The method further includes: The spacing range of the LEDs in the backlight module is determined according to the preset LED boundary calculation method; Determine whether the row spacing and column spacing of the LEDs corresponding to the target LED arrangement data are both within the spacing range of the LEDs; If so, the row spacing and column spacing of the corresponding LED beads will be used as the target row spacing and target column spacing of the LED beads.
5. A display device, characterized in that, The display device is equipped with LED beads, and the distribution of the LED beads is obtained by the LED strip arrangement method of a direct-lit backlight module as described in any one of claims 1 to 4. The number of LED beads conforms to the empirical coefficient C, which is 0.32-0.
42.
6. The display device according to claim 5, characterized in that, The row spacing of the LED beads and the row margin of the top corner LED beads have a first proportional relationship, and the column spacing of the LED beads in the backlight module and the column margin of the top corner LED beads have a second proportional relationship. The first proportional relationship and the second proportional relationship include the same proportional coefficient; and the LED beads are evenly distributed.
7. A computer-readable storage medium, characterized in that, The computer-readable storage medium includes instructions that, when executed on a computer, cause the computer to perform the method as described in any one of claims 1 to 4.