Backlight system

Abstract

The backlight system comprises a back shell, a reflector plate, a light guide plate, an FPC (Flexible Printed Circuit) light bar, a diffusion sheet, a lower brightness enhancement sheet, an upper brightness enhancement sheet and shading glue which are integrated by glue and iron, a groove is formed in the back shell, the reflector plate is positioned at the bottom of the groove, and the light guide plate, the diffusion sheet, the lower brightness enhancement sheet, the upper brightness enhancement sheet and the shading glue are sequentially arranged on the surface of the reflector plate in the direction from the bottom of the groove to a groove opening of the groove. According to the utility model, the working environment temperature of the whole FPC light bar can be identified through the plurality of thermistors uniformly arranged on the FPC light bar, and when the working temperature of the backlight FPC light bar is increased, the resistance value of the NTC thermistor is reduced, the voltage of the NTO port of the NTO bonding pad is reduced, the duty ratio of the PWM signal output by the microprocessor is reduced, and the working environment temperature of the whole FPC light bar can be identified. And the current output by the power supply chip is reduced, the working current of the backlight FPC light bar is finally reduced, the working temperature is gradually reduced, and vice versa.

Description

TECHNICAL FIELD

[0001] The utility model relates to display screen field especially involves a kind of backlight system. BACKGROUND

[0002] In the modern display technology field, backlight system is the key component to realize high-quality image display. Backlight technology is widely used in liquid crystal display (LCD), and the display effect is improved by providing uniform light source. With the progress of science and technology and market demand, backlight system not only needs to provide high brightness and uniform light distribution, but also needs to have high energy consumption control and long life characteristics.

[0003] Typically, as disclosed in the patent document with the application number CN201110366561.X, a backlight system is formed by splicing to make the structure of back frame simple, reduce the production cost of backlight system, and further by setting the heat dissipation elements more densely on the main splicing piece carrying light source along the length direction thereof closer to the central part, the density of heat dissipation elements is higher in the middle area of main splicing piece where heat is relatively concentrated. On the contrary, in the edge area of main splicing piece away from the middle area, the density of heat dissipation elements is relatively sparse. In this way, the distribution density of heat dissipation elements is optimized according to the strength of heat distribution, the heat dissipation area of middle area is expanded by increasing the distribution density of heat dissipation elements, and the heat dissipation effect of main splicing piece in the middle area where heat is relatively concentrated is enhanced, so as to improve the heat dissipation efficiency and effect of backlight system.

[0004] The above patent document discloses that the backlight system has the problem of high heat during use, but there are still limitations in specific use. Specifically,

[0005] 1. The heat generated by the traditional backlight system during long-term work affects the stability and service life of the equipment.

[0006] 2. Performance optimization requirement: when the backlight bar generates heat, there is a temperature difference between each area. The backlight bar at the edge is easy to dissipate heat, so the service life is relatively long, but the backlight bar in the middle area is difficult to dissipate heat. When the current is large, the temperature may further accumulate, so an intelligent control mechanism is needed to dynamically adjust the backlight current according to the real-time working temperature to optimize the performance, prolong the service life and reduce the energy consumption. UTILITY MODEL CONTENT

[0007] Therefore, it is necessary to provide a backlight system to solve the above technical problems.

[0008] In order to solve the above technical problems, the utility model adopts the following technical solutions:

[0009] A backlight system, the backlight system comprising a backshell integrated with glue, a reflecting sheet, a light guide plate, an FPC light bar, a diffusion sheet, a lower light enhancement sheet, an upper light enhancement sheet and a light shielding glue; the backshell is provided with a groove, the reflecting sheet is positioned at the groove bottom, the light guide plate, the diffusion sheet, the lower light enhancement sheet, the upper light enhancement sheet and the light shielding glue are sequentially arranged on the reflecting sheet surface from the groove bottom to the groove opening;

[0010] The side surface of the light guide plate away from the groove bottom is positioned and connected with a flexible circuit board, from the longitudinal section angle, the flexible circuit board is directly below the diffusion sheet, the flexible circuit board is positioned and connected with the FPC light bar towards the side surface of the groove bottom;

[0011] The FPC light bar is uniformly provided with a plurality of thermistors for evenly identifying the working environment temperature of the entire FPC light bar.

[0012] Further, the thermistor is provided with three, and the three thermistors are connected in parallel to form a resistance identification structure.

[0013] Further, the flexible circuit board is provided with a solder pad connection point and a GND zero potential point;

[0014] The resistance identification structure has a first end and a second end, the first end is connected with the solder pad connection point, and the second end is connected with the GND zero potential point.

[0015] Further, the backlight system further comprises a mainboard microprocessor, the mainboard microprocessor is electrically connected with the FPC light bar through the flexible circuit board, and the mainboard microprocessor is configured to receive a temperature signal and output a control signal.

[0016] Further, the solder pad connection point is connected with the input end of the mainboard microprocessor.

[0017] Further, the backlight system further comprises a mainboard power supply chip, the mainboard power supply chip is electrically connected with the FPC light bar through the flexible circuit board, the mainboard power supply chip has a control signal input end, and the control signal input end is connected with the output end of the microprocessor.

[0018] Further, the inner side wall of the groove is provided with a protection part, and the protection part is used for limiting the FPC light bar.

[0019] Further, the protection part is an elastic member, the elastic member is arranged between the FPC light bar side edge and the groove inner side wall, and the elastic member is positioned and connected on the groove inner side wall.

[0020] Further, the width of the elastic member is at least half of the thickness of the FPC light bar.

[0021] Further, the protection part is a support arranged between the surface of the flexible circuit board and the groove bottom.

[0022] Compared with the prior art, the utility model has the following beneficial effects:

[0023] The FPC light bar can be recognized by the multiple thermistors arranged on the FPC light bar, so that the situation that a large amount of heat cannot be dissipated in a certain area is avoided, and the multiple thermistors can fully play a warning role.

[0024] Secondly, when the working temperature of the backlight FPC light bar increases, the resistance value of the NTC negative temperature coefficient thermistor decreases, the voltage of the NTO port of the NTO pad decreases, the duty cycle of the PWM signal output by the microprocessor decreases, the current output by the power supply chip decreases, and finally the working current of the backlight FPC light bar decreases, and the working temperature gradually decreases, and vice versa. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 A front view of the back shell is provided for the utility model;

[0026] Figure 2 A side view of the back shell is provided for the utility model;

[0027] Figure 3 A front view of the back shell is provided for the utility model; Figure 2 A front view of the back shell is provided for the utility model;

[0028] Figure 4 A front view of the back shell is provided for the utility model;

[0029] Figure 5 A front view of the back shell is provided for the utility model;

[0030] Figure 6 A front view of the back shell is provided for the utility model;

[0031] Figure 7 A front view of the back shell is provided for the utility model;

[0032] Figure 8 A front view of the back shell is provided for the utility model;

[0033] Figure 9 A front view of the back shell is provided for the utility model;

[0034] The mark in the figure is explained as follows:

[0035] 1, back shell; 2, reflector; 3, light guide plate; 4, FPC light bar; 5, diffusion sheet; 6, lower light enhancement sheet; 7, upper light enhancement sheet; 8, light shielding glue; 9, groove; 10, flexible circuit board; 11, thermistor; 12, pad connection point; 13, GND zero potential point; 14, mainboard microprocessor; 15, mainboard power supply chip; 16, elastic member; 17, support member. DETAILED DESCRIPTION

[0036] In order to make the person skilled in the art better understand the technical scheme of the present application, the technical scheme in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor should belong to the scope of protection of the present application.

[0037] The conventional backlight system as described in the background art generates heat in long-term work, which affects the stability and service life of the device; performance optimization demand: due to the temperature difference between each area when the backlight bar generates heat, the backlight bar at the edge is easy to dissipate heat, so the service life is relatively long, but the backlight bar in the middle area is difficult to dissipate heat, and when the current is large, the temperature is further aggregated, so an intelligent control mechanism is needed to dynamically adjust the backlight current according to the real-time working temperature to optimize the performance, prolong the service life and reduce the energy consumption.

[0038] In order to solve this technical problem, the present application provides a backlight system.

[0039] Specifically, please refer to Figures 1-9 A backlight system, the backlight system comprises a back shell 1 integrated with glue and iron, a reflector 2, a light guide plate 3, an FPC light bar 4, a diffusion sheet 5, a lower light enhancement sheet 6, an upper light enhancement sheet 7 and light shielding glue 8; the back shell 1 is provided with a groove 9, the reflector 2 is positioned at the groove bottom of the groove 9, and the light guide plate 3, the diffusion sheet 5, the lower light enhancement sheet 6, the upper light enhancement sheet 7 and the light shielding glue 8 are arranged in sequence on the surface of the reflector 2 from the groove bottom to the groove opening of the groove 9;

[0040] The side surface of the light guide plate 3 away from the groove bottom of the groove 9 is positioned and connected with a flexible circuit board 10, and from the longitudinal cross-sectional angle, the flexible circuit board 10 is directly below the diffusion sheet 5, and the flexible circuit board 10 is positioned and connected with the FPC light bar 4 towards the side surface of the groove bottom of the groove 9;

[0041] The FPC lamp strip 4 is uniformly provided with a plurality of thermistors 11 to evenly identify the working environment temperature of the whole FPC lamp strip 4.

[0042] The plurality of thermistors 11 evenly arranged on the FPC lamp strip 4 can identify the working environment temperature of the whole FPC lamp strip 4, so that the situation that a certain area has a large amount of heat that cannot be dissipated is avoided, and the plurality of thermistors 11 can fully play a warning role.

[0043] In order for those skilled in the art to better understand the scheme of the utility model, the technical scheme in the utility model embodiment will be clearly and completely described below in combination with the drawings.

[0044] It should be noted that, in the case of no conflict, the embodiments in the utility model and the features and technical solutions in the embodiments can be combined with each other.

[0045] It should be noted that: similar labels and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings.

[0046] First embodiment

[0047] A backlight system, the backlight system includes a back shell of iron and glue integration 1, a reflection sheet 2, a light guide plate 3, an FPC lamp strip 4, a diffusion sheet 5, a lower light enhancement sheet 6, an upper light enhancement sheet 7 and a light shielding glue 8;The back shell 1 is provided with a groove 9, the reflection sheet 2 is positioned at the groove bottom of the groove 9, and the light guide plate 3, the diffusion sheet 5, the lower light enhancement sheet 6, the upper light enhancement sheet 7 and the light shielding glue 8 are arranged in sequence from the groove bottom to the groove opening of the groove 9 on the surface of the reflection sheet 2;

[0048] The side surface of the light guide plate 3 away from the groove bottom of the groove 9 is positioned and connected with a flexible circuit board 10, and from the longitudinal section angle, the flexible circuit board 10 is directly below the diffusion sheet 5, and the flexible circuit board 10 is positioned and connected with the FPC lamp strip 4 towards the side surface of the groove bottom of the groove 9;

[0049] The FPC lamp strip 4 is uniformly provided with a plurality of thermistors 11 to evenly identify the working environment temperature of the whole FPC lamp strip 4.

[0050] The plurality of thermistors 11 evenly arranged on the FPC lamp strip 4 can identify the working environment temperature of the whole FPC lamp strip 4, so that the situation that a certain area has a large amount of heat that cannot be dissipated is avoided, and the plurality of thermistors 11 can fully play a warning role.

[0051] Second embodiment

[0052] The backlight system provided by the embodiment 1 is further optimized, the three thermistors 11 are provided, and the three thermistors 11 are connected in parallel to form a resistance identification structure.

[0053] The three thermistors 11 cooperate to make the information obtained by each area detection be generated in the same time period, and the information of a certain area is not independent, so that the subsequent early warning processing has limitations.

[0054] The flexible circuit board 10 is provided with a pad connection point 12 and a GND zero potential point 13;

[0055] The resistance identification structure has a first end and a second end, the first end is connected with the pad connection point 12, and the second end is connected with the GND zero potential point 13.

[0056] The backlight system further comprises a mainboard microprocessor 14, the mainboard microprocessor 14 is electrically connected with the FPC light bar 4 through the flexible circuit board 10, and the mainboard microprocessor 14 is configured to receive a temperature signal and output a control signal.

[0057] The pad connection point 12 is connected with the input end of the mainboard microprocessor 14.

[0058] The backlight system further comprises a mainboard power supply chip 15, the mainboard power supply chip 15 is electrically connected with the FPC light bar 4 through the flexible circuit board 10, the mainboard power supply chip 15 has a control signal input end, and the control signal input end is connected with the output end of the microprocessor.

[0059] Through the above design, temperature regulation is quickly realized, specifically, when the working temperature of the backlight FPC light bar 4 increases, the resistance value of the NTC negative temperature coefficient thermistor 11 decreases, the voltage of the NTO port of the NTO pad decreases, the duty cycle of the PWM signal output by the microprocessor decreases, the current output by the power supply chip decreases, and finally the working current of the backlight FPC light bar 4 decreases, and the working temperature gradually decreases, and vice versa.

[0060] Third embodiment

[0061] The backlight system provided by the embodiment 1 or 2 is further optimized, the inner side wall of the groove 9 is provided with a protection part, and the protection part is used for limiting the FPC light bar 4.

[0062] Preferably, the protection part is an elastic piece 16, the elastic piece 16 is arranged between the side edge of the FPC light bar 4 and the inner side wall of the groove 9, and the elastic piece 16 is positioned and connected to the inner side wall of the groove 9.

[0063] Preferably, the width of the elastic member 16 is at least half the thickness of the FPC light bar 4.

[0064] Since the FPC light bar 4 is arranged on the flexible circuit board 10, in order to prevent the FPC light bar 4 from colliding with the inner wall of the groove 9 when the flexible circuit board 10 slightly shakes, the elastic member 16 (which can be a rubber block or a sponge block) is arranged to support the FPC light bar 4.

[0065] Fourth embodiment

[0066] In the further optimized backlight system provided in the above embodiments, the inner wall of the groove 9 is provided with a protective part for limiting the FPC light bar 4.

[0067] The protective part is a support member 17 arranged between the surface of the flexible circuit board 10 and the bottom of the groove 9.

[0068] In the third embodiment, since the FPC light bar 4 is arranged on the flexible circuit board 10, in order to prevent the FPC light bar 4 from colliding with the inner wall of the groove 9 when the flexible circuit board 10 slightly shakes, the support member 17 is arranged to stabilize the flexible circuit board 10 and the FPC light bar 4 at the same time, so that the stability of the FPC light bar 4 is higher.

[0069] It should be noted that three NTC negative temperature coefficient thermistors 11 are arranged at the left, middle and right positions of the FPC light bar 4 (the resistance value of the NTC negative temperature coefficient thermistor 11 decreases with the increase of the ambient temperature), and the specific resistance value is selected according to the actual design application. The three thermistors 11 are connected in parallel, one side is connected to the NTO pad, and the other side is connected to the GND zero potential point 13. The purpose of arranging the thermistors 11 at the left, middle and right positions is to more evenly identify the working environment temperature of the entire FPC light bar 4, so as to more accurately adjust the working current of the backlight;

[0070] The NTO pad is connected to the input end of the microprocessor (i.e., the mainboard microprocessor 14) on the HOST mainboard. When the working temperature of the backlight FPC light bar 4 changes, the microprocessor can detect the voltage change of the NTO port of the NTO pad, and calculate and change the duty cycle of the output PWM control signal according to the threshold value set during debugging;

[0071] The control signal input end of the mainboard power supply chip 15 (i.e., the power supply chip on the HOST mainboard) is connected to the output end of the microprocessor on the HOST mainboard. When the PWM control signal changes, the output end of the power supply chip will make corresponding adjustment to change the output current according to the change of the input signal, so as to adjust the working current of the backlight LED.

[0072] When the working temperature of the backlight FPC light bar 4 increases, the resistance value of the NTC negative temperature coefficient thermistor 11 decreases, the voltage of the NTO port of the NTO pad decreases, the duty cycle of the PWM signal output by the microprocessor decreases, the current output by the power supply chip decreases, and finally the working current of the backlight FPC light bar 4 decreases, the working temperature gradually decreases, and vice versa.

[0073] In the utility model, unless another definite provision and limitation, the terms "mount", "link", "connect", "fix" and so on should do broad sense understanding, for example, can be fixed connection, also can be detachable connection, or be integrated;Can be mechanical connection, also can be electric connection or each other can communicate;Can be direct connection, also can indirectly connect through intermediate medium, can be two element internal communication or two element interaction, unless another definite limitation.For ordinary skilled person in the art, can understand the concrete meaning of above-mentioned terms in the utility model according to specific circumstances.

[0074] Obviously, the above-described embodiments are only a part of the embodiments of the utility model, and are not all the embodiments, and the preferred embodiments of the utility model are given in the drawings, but do not limit the patent range of the utility model.The utility model can be realized in many different forms, and conversely, the purpose of providing these embodiments is to make the understanding of the disclosure of the utility model more thorough and comprehensive.Although the utility model is described in detail with reference to the foregoing embodiments, for those skilled in the art, the technical solutions recorded in the foregoing specific embodiments can be modified, or some technical features can be replaced equivalently.It is same reason that equivalent structure made by using the contents of the utility model specification and drawings, direct or indirect use in other related technical fields, are also within the patent protection range of the utility model.

Claims

1. A backlight system, characterized by, The backlight system comprises a back shell (1) integrated with glue and iron, a reflecting sheet (2), a light guide plate (3), an FPC light bar (4), a diffusion sheet (5), a lower light enhancement sheet (6), an upper light enhancement sheet (7) and light shielding glue (8); the back shell (1) is provided with a groove (9), the reflecting sheet (2) is positioned at the groove bottom of the groove (9), and the light guide plate (3), the diffusion sheet (5), the lower light enhancement sheet (6), the upper light enhancement sheet (7) and the light shielding glue (8) are sequentially arranged on the surface of the reflecting sheet (2) from the groove bottom to the groove opening of the groove (9); the surface of the side of the light guide plate (3) away from the groove bottom of the groove (9) is positioned and connected with a flexible circuit board (10), and the flexible circuit board (10) is directly below the diffusion sheet (5) when viewed from the longitudinal cross-sectional angle, and the surface of the side of the flexible circuit board (10) toward the groove bottom of the groove (9) is positioned and connected with the FPC light bar (4); a plurality of thermistors (11) are uniformly arranged on the FPC light bar (4) to evenly identify the working environment temperature of the entire FPC light bar (4).

2. The backlight system of claim 1, wherein, The three thermistors (11) are connected in parallel to form a resistance identification structure.

3. The backlight system of claim 1, wherein, The flexible circuit board (10) is provided with a pad connection point (12) and a GND zero potential point (13); the resistance identification structure has a first end and a second end, the first end is connected with the pad connection point (12), and the second end is connected with the GND zero potential point (13).

4. The backlight system according to claim 1 or 2 or 3, characterized in that, The backlight system further comprises a mainboard microprocessor (14), the mainboard microprocessor (14) is electrically connected with the FPC light bar (4) through the flexible circuit board (10), and the mainboard microprocessor (14) is configured to receive a temperature signal and output a control signal.

5. The backlight system of claim 3, wherein, The pad connection point (12) is connected with the input end of the mainboard microprocessor (14).

6. The backlight system of claim 5, wherein, The backlight system further comprises a mainboard power supply chip (15), the mainboard power supply chip (15) is electrically connected with the FPC light bar (4) through the flexible circuit board (10), the mainboard power supply chip (15) has a control signal input end, and the control signal input end is connected with the output end of the microprocessor.

7. The backlight system of claim 1, wherein, The inner side wall of the groove (9) is provided with a protection part for limiting the FPC light bar (4).

8. The backlight system of claim 7, wherein, The protection part is an elastic member (16) arranged between the side edge of the FPC light bar (4) and the inner side wall of the groove (9), and the elastic member (16) is positioned and connected to the inner side wall of the groove (9).

9. The backlight system of claim 8, wherein, The width of the elastic member (16) is at least half of the thickness of the FPC light bar (4).

10. The backlight system of claim 7, wherein, The protection part is a support member (17) arranged between the surface of the flexible circuit board (10) and the groove bottom of the groove (9).

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