Optimization design method for backlight circuit of small-size screen

Abstract

The invention discloses an optimal design method for a backlight circuit of a small-size screen, relates to the technical field of liquid crystal display modules, and fundamentally eliminates the problems of physical abutted seams and tolerance accumulation caused by parallel arrangement of independent modules by constructing an integrated bearing frame without a middle partition. According to the design, a single integral shading film is cooperatively covered, an independent backlight assembly is configured, and the problems of visual splitting and optical dark areas at the splicing position are effectively solved. In addition, a central positioning groove, an assembly marking line and other multi-dimensional alignment references are preset on the unified frame, and single and high-precision guidance is provided for assembly of the liquid crystal display glass assembly. Finally, the three core indexes of the actually measured splicing gap deviation value, the assembly alignment conformity and the brightness uniformity of the splicing area are strictly compared with the preset threshold value, it is ensured that the physical structure and the optical effect of a final product are highly unified, and high-reliability precise seamless splicing is achieved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of liquid crystal display module, in particular to a small size screen backlight circuit optimization design method. BACKGROUND

[0002] With the rapid development of electronic display technology, small size screens are widely used in the fields of smart phones, wearable devices and medical instruments. As a key link of the display effect of liquid crystal display (LCD), the performance of the backlight system directly affects the brightness uniformity and energy consumption performance of the screen. The traditional backlight circuit design mostly adopts linear driving mode, which has the problems of high energy consumption and uneven heat dissipation. In recent years, with the increasing demand for energy saving and environmental protection and the increasing integration of chips, the optimization design of the backlight circuit for small size screens has become a research hotspot to realize low power consumption, high brightness and long service life of the display effect, and to meet the needs of diversified application scenarios.

[0003] However, the small size screen backlight circuit optimization design method applied to the vehicle display module often has the following technical defects in the prior art: 1) Independent backlight modules are spliced, which has inherent physical seams and optical dark areas; the existing splicing scheme mostly adopts the physical parallel mode of two independent backlight modules each having a complete four-side frame structure (such as a plastic frame or an iron frame). This design results in a relatively wide physical seam at the splicing part of the two display screens, which is caused by the cumulative frame of each side. This seam not only causes a clear split in the visual effect, which destroys the integrated aesthetic effect pursued by the vehicle display, but also forms a dark area at the joint of the display area that cannot be eliminated, which seriously affects the continuity and integrity of the picture; 2) Lack of unified assembly reference, resulting in low alignment accuracy and accumulated tolerance; further, since the assembly is based on two independent modules, the entire system lacks a unified assembly reference. During assembly, the alignment of the single "FOG (liquid crystal glass) and backlight" needs to be completed, and then the secondary alignment between the two complete modules is performed. This step-by-step, non-integrated assembly method easily introduces cumulative tolerance, making it difficult to ensure stable gap and flushness between the two FOGs, and often causing problems such as high-low step difference or uneven gap. At the same time, the alignment accuracy between the FOG and the respective backlight is also difficult to control, increasing the risk of light leakage or uneven brightness at the splicing part. SUMMARY

[0004] In view of the deficiencies of the prior art, the present application provides a small size screen backlight circuit optimization design method, which solves the technical defects in the background art.

[0005] To achieve the above purpose, the present application is implemented by the following technical scheme: a small size screen backlight circuit optimization design method applied to a vehicle double display module, comprising the following steps: S1, constructing an integrated bearing frame designed as a single structure capable of simultaneously accommodating at least two liquid crystal display glass assemblies, and no physical isolation barrier is provided at the predetermined splicing abutment position of the two liquid crystal display glass assemblies; S2, presetting a multi-dimensional alignment reference on the integrated bearing frame, which is used to accurately guide the relative positions of the two liquid crystal display glass assemblies and their respective relative positions with the frame in subsequent assembly process; S3, performing splicing assembly based on the multi-dimensional alignment reference to assemble the two liquid crystal display glass assemblies into the integrated bearing frame to form a spliced display unit; S4, evaluating the physical precision and optical effect of the splicing assembly to determine whether the spliced display unit meets the preset seamless display standard by quantifying the evaluation parameters.

[0006] Preferably, the specific way of constructing the integrated bearing frame in the S1 step is to integrally integrate the backlight frame and the metal frame to form a common cavity structure for bearing the two liquid crystal display glass assemblies, which has a peripheral barrier but no partition in the middle.

[0007] Preferably, the S1 step further includes a cooperative design step of backlight film material, which includes: An integral light shielding film capable of covering the display areas of the two liquid crystal display glass assemblies at the same time is adopted; and below the integral light shielding film, an independent light guide plate, an optical film set and an LED light source module are configured for each liquid crystal display glass assembly.

[0008] Preferably, the multi-dimensional alignment reference preset in the S2 step includes a center positioning groove with a predetermined depth set along the center line of the predetermined splicing abutment position at the bottom of the integrated bearing frame, which serves as the center line reference when the two liquid crystal display glass assemblies are spliced.

[0009] Preferably, the multi-dimensional alignment reference preset in the S2 step further includes at least one pair of assembly marking lines set on the inner walls of the opposite sides of the integrated bearing frame for limiting the installation positions of the liquid crystal display glass assemblies.

[0010] Preferably, the evaluation of the physical precision in the S4 step includes calculating the splicing gap deviation value, and the specific acquisition method is: The actual physical gap width of the two liquid crystal display glass assemblies after splicing is measured by high-precision image or probe, and the absolute difference between the actual physical gap width and the preset theoretical zero gap value is calculated.

[0011] Preferably, the S4 step of evaluating the physical precision further comprises calculating the assembly alignment compliance, which is obtained by: The actual distance between the edge of the liquid crystal display glass assembly and the assembly marking line is measured, and the actual distance is compared with the design standard alignment distance, and the deviation is used as the evaluation basis for the assembly alignment compliance.

[0012] Preferably, it further comprises judging the physical precision, specifically: The calculated splice gap deviation value is compared with the first preset tolerance threshold, and the deviation of the assembly alignment compliance is compared with the second preset tolerance threshold; when any calculation result exceeds the corresponding tolerance threshold, it is determined that the assembly is unqualified, and an adjustment instruction for the assembly process is triggered.

[0013] Preferably, the S4 step of evaluating the optical effect comprises measuring the brightness uniformity of the splicing area; the measuring method is: In the display module lighting state, the brightness values on the center line of the splicing joint and the reference brightness values of the two display area center points away from the joint are collected, and then the ratio or difference between the brightness value on the center line of the joint and the average of the two reference brightness values is calculated to quantify the brightness uniformity of the splicing area.

[0014] Preferably, the step of finally determining whether the optimization design method achieves the predetermined effect comprises: Comprehensive judgment is made on whether the splice gap deviation value, the assembly alignment compliance and the brightness uniformity of the splicing area are within the respective preset qualified standard range; only when all the aforementioned evaluation parameters meet the standard, it is confirmed that the splicing assembly of the vehicle-mounted double display module is qualified.

[0015] The present application provides a small size screen backlight circuit optimization design method. It has the following beneficial effects: (1) The small size screen backlight circuit optimization design method, by constructing a single common cavity structure integrated by the backlight frame and the metal frame as an integrated bearing frame; the frame does not set a physical isolation barrier at the predetermined splicing abutment position of the two liquid crystal display glass assemblies, which fundamentally eliminates the cumulative physical splicing seam caused by the parallel arrangement of independent modules in the prior art; in combination with the use of an overall light shielding film that can cover the display areas of the two liquid crystal display glass assemblies, and the configuration of independent light guide plates, optical film sets and LED light source modules under each component, the visual fragmentation and optical dark area problems at the splicing position are effectively solved; finally, by measuring the brightness uniformity of the splicing area, i.e. comparing the brightness value on the center line of the joint with the reference brightness value, the continuity and integrity of the display picture are ensured.

[0016] (2) The small-size screen backlight circuit optimization design method uses the integrated bearing frame as a unified assembly reference, fundamentally solves the tolerance accumulation problem caused by independent module secondary positioning, and provides single and high-precision guidance for the assembly of the two liquid crystal display glass components by pre-setting the center positioning groove as the center line reference and the assembly marking line as the position limit on the unified frame, thereby significantly improving the positioning accuracy and consistency. The effectiveness of the method is ensured by quantitative evaluation, specifically by calculating the splicing gap deviation value obtained by measuring the actual physical gap width and the assembly positioning compliance obtained by measuring the actual distance between the edge of the liquid crystal display glass component and the assembly marking line, and strictly comparing these calculation results with the first and second preset tolerance thresholds, thereby ensuring that the final splicing product has no high-low difference and uniform gap, and realizing high-reliability precise positioning. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 The application structure diagram of the small-size screen backlight circuit optimization design method of the present application; Figure 2 The step flow diagram of the small-size screen backlight circuit optimization design method of the present application. DETAILED DESCRIPTION

[0018] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0019] Embodiment 1 Please refer to Figure 1 The present application provides a small-size screen backlight circuit optimization design method, characterized in that it is applied to a vehicle-mounted double display module and includes the following steps: S1, an integrated bearing frame is constructed, which is designed as a single structure capable of accommodating at least two liquid crystal display glass components, and no physical isolation barrier is provided at the predetermined splicing abutment position of the two liquid crystal display glass components; S2, multi-dimensional positioning references are pre-set on the integrated bearing frame, which are used to accurately guide the relative positions of the two liquid crystal display glass components and their respective relative positions with the frame during subsequent assembly; S3, splicing assembly based on the multi-dimensional positioning references is performed, the two liquid crystal display glass components are assembled into the integrated bearing frame, and a splicing display unit is formed; S4, evaluating the physical precision and optical effect of the splicing assembly, judging whether the splicing display unit reaches the preset seamless display standard by quantitatively evaluating parameters.

[0020] In the embodiment, the splicing assembly based on the multi-dimensional alignment reference in the S3 step first includes fixing the integrated carrying frame on a high-precision assembly platform and establishing a digital assembly reference coordinate system, then further includes controlling a six-axis mechanical arm to place the first liquid crystal display glass assembly according to the reference coordinate system, then after the first liquid crystal display glass assembly is placed, further includes controlling the mechanical arm again and taking the splicing edge of the first placed component as a dynamic reference to guide the adaptive seamless fitting placement of the second liquid crystal display glass assembly, and finally, before final fixing, further includes measuring the splicing quality by a non-contact sensor and calculating a splicing quality comprehensive index (hereinafter marked as GQI), and making necessary micron-level position adjustment to the second liquid crystal display glass assembly according to the index; Further, The non-contact laser displacement sensor deployed on the mechanical arm scans from one end to the other end along the splicing joint, and synchronously collects gap width data and high-low difference data of at least 10 sampling points on the splicing joint; The splicing quality comprehensive index GQI is obtained by weighted summation of the gap width and the high-low difference of all sampling points. The specific calculation method is as follows: first, the gap width measurement value of the kth sampling point is multiplied by the first weight coefficient a; then, the absolute value of the high-low difference of the kth sampling point is multiplied by the second weight coefficient; then, the two products are added to obtain the quality sub-index of the kth sampling point; finally, the average value of the quality sub-indexes of all N sampling points is obtained, that is, the final splicing quality comprehensive index GQI; the specific calculation formula of GQI is: In the above formula, N represents the total number of sampling points, which is set to 10 in the embodiment; gk represents the gap width of the kth sampling point, and the increase of gk directly leads to the linear increase of GQI, indicating that the physical gap becomes larger and the quality decreases; hk represents the high-low difference of the kth sampling point, and the increase of |hk| also leads to the linear increase of GQI, indicating that the flatness becomes worse and the quality decreases; a represents the gap width weight coefficient, which is set to 0.6 in the embodiment, and is used to adjust the importance of the gap width in the total evaluation; β represents the high-low difference weight coefficient, which is set to 0.4 in the embodiment, and is used to adjust the importance of the high-low difference in the total evaluation; the sum of a and β is 1, which can be adjusted according to the different emphasis of visual continuity or touch smoothness of the vehicle-mounted display.

[0021] Further, the calculated GQI is compared with a preset quality threshold GQI thr In the embodiment, GQIthr = 0.015) are compared; specifically: If GQI ≤ GQI thr : Determine assembly qualified, enter next process; If GQI > GQI thr : Determine assembly unqualified. The system will activate the piezoelectric ceramic fine adjuster array located below the integrated bearing frame, according to the calculation results of GQI and the data of each sampling point, to perform micron-level translation or jacking adjustment on the position of the second component, and then recalculate GQI, and repeat the process until qualified.

[0022] Embodiment 2 Please refer to Figure 2 The specific way of constructing an integrated bearing frame in the S1 step is to integrate the backlight frame and the metal iron frame to form a common cavity structure for bearing the two liquid crystal display glass components, which has a peripheral retaining wall but no partition in the middle.

[0023] The S1 step also includes a collaborative design step of the backlight film material, including: An integral light shielding film that can cover the display areas of the two liquid crystal display glass components at the same time is used; and below the integral light shielding film, independent light guide plates, optical film groups and LED light source modules are configured for each liquid crystal display glass component.

[0024] The multi-dimensional alignment reference preset in the S2 step includes a center positioning groove with a predetermined depth set along the center line of the predetermined splicing abutment position at the bottom of the integrated bearing frame, which serves as the center line reference when the two liquid crystal display glass components are spliced.

[0025] The multi-dimensional alignment reference preset in the S2 step also includes at least one pair of assembly marking lines set on the inner walls of the opposite sides of the integrated bearing frame, which are used to limit the installation position of the liquid crystal display glass component.

[0026] Further, S1 aims to manufacture a high-precision, high-strength single bearing base that fundamentally eliminates physical seams and realizes the unity of optical performance and visual integrity. Specifically, first, a SECC steel plate is made into a metal iron frame with a double-cavity structure through multi-process progressive stamping, and then the metal iron frame is used as an insert to form a whole with PC+30% GF composite engineering plastic by insert injection molding process, forming a seamless integrated bearing frame with rigidity and precision. Next, independent backlight assemblies composed of LED light source modules, light guide plates and optical films are pre-assembled in the two side cavities of the frame to ensure the optical performance of each display area. Finally, a whole shading film covering the entire double-screen area is laid on the top, and the physical seams below are effectively shielded from the visual top layer through the precise window design, laying a solid structural and optical foundation for seamless display.

[0027] Further, S2 aims to establish a super-precision three-dimensional positioning reference system for subsequent automated assembly process and verify the feasibility of assembly from the design level. Specifically, first, a high-precision ultraviolet laser is used to non-contactly mark a center positioning groove with a depth and width controlled in microns along the geometric center line on the bottom of the integrated bearing frame with backlight film layout, serving as the main reference in X-Y direction during double-screen splicing. Then, during the same clamping, the same laser is used to mark clear assembly marking lines on the inner walls of the frame, serving as auxiliary reference for Z-axis rotation and lateral positioning. Finally, through a quantitative alignment tolerance ΔT calculation formula, the total width of the inner cavity, the standard width of the two liquid crystal display glass assemblies and the theoretical splicing gap are considered to systematically evaluate and verify the design tolerance chain, ensuring that the assembly can proceed smoothly and the precision is controllable even in the case of component size fluctuation.

[0028] The evaluation of the physical precision in the S4 step includes calculating the splicing gap deviation value, specifically: The actual physical gap width of the two liquid crystal display glass assemblies after splicing is measured by high-precision image or probe, and the absolute difference between the actual physical gap width and the preset theoretical zero gap value is calculated.

[0029] The evaluation of the physical precision in the S4 step also includes calculating the assembly alignment compliance; its acquisition method is: The actual distance between the edge of the liquid crystal display glass assembly and the assembly marking line is measured respectively, and the actual distance is compared with the design standard alignment distance, and the deviation amount is used as the judgment basis of the assembly alignment compliance.

[0030] Further including judging the physical precision, specifically: The calculated splicing gap deviation value is compared with a first preset tolerance threshold, and the deviation of the assembly alignment conformity is compared with a second preset tolerance threshold; when any one of the calculation results exceeds the corresponding tolerance threshold, it is determined that the assembly is unqualified, and an adjustment instruction for the assembly process is triggered.

[0031] The optical effect is evaluated in the S4 step, including measuring the brightness uniformity of the splicing area; the measurement method is: In the display module lighting state, the brightness values on the center line of the splicing joint and the reference brightness values of the center points of the two display areas away from the joint are collected respectively, and then the ratio or the difference between the brightness value on the joint center line and the average of the two reference brightness values is calculated to quantify the brightness uniformity of the splicing area.

[0032] The final step of determining whether the optimization design method achieves the predetermined effect includes: The splicing gap deviation value, the assembly alignment conformity and the brightness uniformity of the splicing area are comprehensively determined whether they are within the respective preset qualified standard range; only when all the aforementioned evaluation parameters meet the standard, it is confirmed that the splicing assembly of the vehicle-mounted double display module is qualified.

[0033] In this embodiment, the evaluation and determination step of S4 provides decisive closed-loop quality control guarantee for the entire optimization design method, and its core significance in the system is to objectively and accurately verify whether all the previous design and assembly steps truly achieve the dual seamless goals of physical structure and optical effect through multi-dimensional quantitative data; Among them, the significance of collecting and calculating the splicing gap deviation value is to directly quantify the tightness of splicing from the microscopic physical level, ensuring the complete elimination of traditional physical seams; the significance of evaluating the assembly alignment conformity is to ensure the installation accuracy and stability of the two liquid crystal display glass components in the integrated frame from the macroscopic structure level, preventing stress concentration or long-term reliability problems caused by misalignment; and the significance of measuring the brightness uniformity of the splicing area is to scientifically judge whether there is an optical dark area or bright line in the splicing area from the visual level of the end user's perception, which is a key indicator to achieve the optical effect of "pseudo-integrated screen"; Therefore, the final comprehensive determination of the three core parameters of the splicing gap deviation value, the assembly alignment conformity and the brightness uniformity of the splicing area all need to meet the respective preset qualified standards, thus constructing a three-dimensional, strict and traceable quality acceptance system, thereby ensuring that each vehicle-mounted double display module that is out of line reaches the designed expected high integration in physical form and visual perception.

[0034] While embodiments of the application have been shown and described, it is to be understood that the embodiments described are merely exemplary of the principles and application of the present application. Numerous modifications and adaptions can be effected without departing from the spirit and scope of the present application, which is not limited to the exact construction and arrangement described. It is intended, therefore, to cover all modifications and adaptions that fall within the scope of the claims and their equivalents.

Claims

1. A method for optimizing the backlight circuitry of a small-sized screen, characterized in that: For use in automotive dual-display modules, the following steps are included: S1. Construct an integrated support frame, wherein the integrated support frame is designed as a single structure that can simultaneously accommodate at least two liquid crystal display glass components, and no physical isolation barrier is set at the predetermined splicing and adjacent positions of the two liquid crystal display glass components. S2. A multi-dimensional alignment reference is preset on the integrated support frame. The multi-dimensional alignment reference is used to accurately guide the relative positions of the two liquid crystal display glass components and their respective relative positions with respect to the frame during subsequent assembly. S3. Perform splicing assembly based on the multi-dimensional alignment reference, and install the two liquid crystal display glass components into the integrated support frame to form a splicing display unit; S4. Evaluate the physical precision and optical effect of the splicing assembly, and determine whether the splicing display unit meets the preset seamless display standard by quantifying evaluation parameters.

2. The method for optimizing the backlight circuitry of a small-sized screen according to claim 1, characterized in that: The specific method for constructing the integrated support frame in step S1 is to integrate the backlight frame and the metal frame into a common cavity structure with an outer retaining wall and no partition in the middle, which is used to support the two liquid crystal display glass components.

3. The method for optimizing the backlight circuitry of a small-sized screen according to claim 2, characterized in that: Step S1 also includes a co-design step for the backlight film material, including: An integral light-shielding film capable of simultaneously covering the display areas of the two liquid crystal display glass components is adopted; and under the integral light-shielding film, each liquid crystal display glass component is equipped with an independent light guide plate, optical film group and LED light source module.

4. The method for optimizing the backlight circuitry of a small-sized screen according to claim 3, characterized in that: The multi-dimensional alignment reference preset in step S2 includes a center positioning groove with a predetermined depth set at the bottom of the integrated support frame along the center line of the predetermined splicing adjacent position. This center positioning groove serves as a center line reference when splicing the two liquid crystal display glass components.

5. The method for optimizing the backlight circuitry of a small-sized screen according to claim 4, characterized in that: The multidimensional alignment reference preset in step S2 also includes at least one pair of assembly marking lines on the inner walls of opposite sides of the integrated support frame to define the installation position of the liquid crystal display glass assembly.

6. The method for optimizing the backlight circuitry of a small-sized screen according to claim 5, characterized in that: The physical accuracy assessment in step S4 includes calculating the splicing gap deviation value, which is obtained in the following way: The actual physical gap width between the two liquid crystal display glass components after splicing is measured by high-precision imaging or probes, and the absolute difference between the actual physical gap width and the preset theoretical zero gap value is calculated.

7. The method for optimizing the backlight circuitry of a small-sized screen according to claim 6, characterized in that: The evaluation of physical accuracy in step S4 also includes calculating the assembly alignment accuracy; the method for obtaining this accuracy is as follows: The actual distance between the edge of the liquid crystal display glass assembly and the assembly marking line is measured respectively, and the actual distance is compared with the design standard alignment distance. The deviation is used as the basis for judging the assembly alignment conformity.

8. The method for optimizing the backlight circuitry of a small-sized screen according to claim 7, characterized in that: This further includes determining the physical precision, specifically: The calculated splicing gap deviation value is compared with the first preset tolerance threshold, and the deviation of the assembly alignment conformity is compared with the second preset tolerance threshold. When any calculation result exceeds its corresponding tolerance threshold, the assembly is determined to be unqualified, and an adjustment command for the assembly process is triggered.

9. The method for optimizing the backlight circuitry of a small-sized screen according to claim 8, characterized in that: The evaluation of the optical effect in step S4 includes measuring the brightness uniformity of the splicing area; the measurement method is as follows: When the display module is lit, the brightness value on the center line of the splicing seam and the reference brightness value of the center points of the two display areas far away from the seam are collected respectively. Then, the brightness uniformity of the splicing area is quantified by calculating the ratio or difference between the brightness value on the center line of the seam and the average value of the two reference brightness values.

10. The method for optimizing the backlight circuitry of a small-sized screen according to claim 9, characterized in that: The final steps for determining whether the optimization design method has achieved the intended effect include: The splicing gap deviation, assembly alignment, and brightness uniformity of the splicing area are all determined to be within their respective preset acceptable ranges. Only when all the aforementioned evaluation parameters meet the standards are the splicing and assembly of the vehicle-mounted dual-display module confirmed as qualified.

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