CN109765713B

CN109765713B - Manufacturing method of reinforced display control terminal

Info

Publication number: CN109765713B
Application number: CN201910212598.3A
Authority: CN
Inventors: 钱毅; 董欣; 王孟超; 李涛
Original assignee: China North Computer Application Technology Research Institute
Current assignee: China North Computer Application Technology Research Institute
Priority date: 2019-03-20
Filing date: 2019-03-20
Publication date: 2021-07-02
Anticipated expiration: 2039-03-20
Also published as: CN109765713A

Abstract

The invention discloses a manufacturing method of a reinforced display and control terminal, which comprises the following steps: step 1, respectively manufacturing a display control component, a backlight component, a box body component, a cover plate component and a key module of a display control terminal; step 2, fixing the elastic damping material of the backlight component in the box body component and connecting the LED backlight source of the backlight component with the inner side wall of the box body component in a sealing way through heat-conducting glue; step 3, mounting the display and control component above the backlight component, and attaching the display and control component to the front end of the box component through a detachable adhesive frame and hermetically connecting the display and control component with the inner side wall of the box component; step 4, mounting the key module in a rectangular groove arranged at the lower end of the box body part; and 5, fixing the cover plate part at the rear end of the box body part and hermetically connecting the cover plate part with the inner side wall of the box body part. The invention has the beneficial effects that: each functional unit can be independently applied to other display and control terminals, and the whole display and control terminal can still normally work and use in severe environments such as extreme temperature, humidity, vibration, impact, electromagnetic interference and the like.

Description

Manufacturing method of reinforced display control terminal

Technical Field

The invention relates to the technical field of vehicle display and control terminals, in particular to a manufacturing method of a reinforced display and control terminal.

Background

With the continuous development of modern information technology, electronic technology and computer control technology, electronic application equipment of various vehicle-mounted mobile platforms comes along. The vehicle-mounted display and control terminal is used as a control center of a whole vehicle, and high resolution and light weight and thinness are development trends and directions of the vehicle-mounted display and control terminal, which put higher requirements on light weight and thinness of the display and control terminal. When the requirement of lightness and thinness is met, the display and control terminal also needs to work and use in severe environments such as extreme temperature, humidity, vibration, impact, electromagnetic interference and the like, and the environments provide requirements for reinforcement of the display and control terminal. In addition, the existing display and control terminals are designed integrally, and all parts cannot be independently applied to other display and control terminals, so that subsequent research and development and production cost are increased.

Disclosure of Invention

In order to solve the above problems, an object of the present invention is to provide a method for manufacturing a reinforced display and control terminal, in which each manufactured functional component can be independently applied to other display and control terminals, and the whole display and control terminal meets the requirement of being light and thin, and can still work and be used normally in severe environments such as extreme temperature, humidity, vibration, impact, electromagnetic interference, etc.

The invention provides a manufacturing method of a reinforced display and control terminal, which comprises the following steps:

step 1, respectively manufacturing five functional components of a display and control terminal, namely a display and control component, a backlight component, a box body component, a cover plate component and a key module;

step 2, fixing the backlight component in the box body component through an elastic damping material, and hermetically connecting an LED backlight source of the backlight component with the inner side wall of the box body component through heat conducting glue;

step 3, mounting the display and control component above the backlight component, attaching the display and control component to the front end of the box component through a detachable adhesive frame and connecting the display and control component with the inner side wall of the box component in a sealing manner;

step 4, mounting the key module in a rectangular groove arranged at the lower end of the box body part;

and 5, fixing the cover plate component at the rear end of the box body component through a stainless steel fastener and connecting the cover plate component with the inner side wall of the box body component in a sealing manner.

As a further improvement of the invention, in the step 1: the manufacturing method comprises the steps that the capacitive touch screen is completely attached to the back surface of the protective glass through optical cement, the EMI electromagnetic shielding film is completely attached to the back surface of the capacitive touch screen through the optical cement, the liquid crystal panel is completely attached to the back surface of the EMI electromagnetic shielding film through the optical cement, the ITO heating glass is completely attached to the back surface of the liquid crystal panel through the optical cement, and the display control component is manufactured.

As a further improvement of the invention, in the step 1: the edge of the composite film is attached to the back of the upper diffusion film through the diaphragm fixing glue, the edge of the light guide plate is attached to the back of the composite film through the diaphragm fixing glue, the reflection film is attached to the back of the light guide plate through the diaphragm fixing glue, and the LED backlight source is arranged on the side edge of the light guide plate to complete the manufacturing of the backlight component.

As a further improvement of the invention, in the step 1: the manufacturing method comprises the steps of manufacturing an integrally formed box frame, a plurality of trusses, thin plates and thin plates, dividing the box frame into a front end containing space and a rear end containing space, arranging a rectangular groove for installing a key module at the lower end of the box frame, and finishing the manufacturing of the box component.

As a further improvement of the invention, in the step 1: the rubber key group, the pressing plate and the key plate are fixed through screws and nuts, the sensor flexible plate and the indicator light flexible plate are connected to the left side and the right side of the key plate respectively, the flexible printed board connected with the signal processing board is connected to the key plate, and the key group is manufactured.

As a further improvement of the invention, installation spaces of the power supply board, the signal processing board, the power supply filter and the backlight driving board are reserved on the front side of the cover plate, a fin heat dissipation structure and an electric connector are arranged on the back side of the cover plate, and the designed power supply board, the signal processing board, the power supply filter and the backlight driving board are installed in the installation spaces on the front side of the cover plate according to requirements, so that the manufacture of the cover plate component is completed.

As a further improvement of the invention, in the step 2: and fixing the backlight component in the box body frame in the front end accommodating space of the box body component through an elastic damping material, and fixing the LED backlight source of the backlight component on the inner side wall of the box body frame in the front end accommodating space through heat conducting glue.

As a further improvement of the invention, in the step 3: show accuse part with reserve certain clearance between the box frame inside wall of box part, will through dismantling the viscose it pastes to show accuse part frame back on the box frame inside wall, use the sealed glue of elasticity to carry out the periphery in the clearance and beat to glue sealedly imbed continuous electrically conductive elastic material in the inboard periphery of box frame sets up elasticity electrically conductive material mounting groove in advance, follows touch-sensitive screen FPC and LCD screen FPC respectively two FPC threading trompils on the box frame cross the cabin extremely in the rear end accommodation space of box frame.

As a further improvement of the invention, in the step 4: will rubber key group installs in the rectangular channel, will the sensor flexible board with the pilot lamp flexible board joint is fixed the inside sheet metal back of box part to install the touch-sensitive screen drive plate the sheet metal back, and with touch-sensitive screen FPC with key board connection and joint are fixed the sheet metal back.

As a further improvement of the invention, in the step 5: installing the power panel, the signal processing panel, the power filter and the backlight driving board in an installation space on the front surface of the cover plate, and completing wiring among the power panel, the signal processing panel, the power filter and the backlight driving board; completing wiring between the ITO heating glass of the display control component and the signal processing board, wiring between the backlight driving board and the LED backlight source of the backlight component, and wiring between the liquid crystal display FPC and the signal processing board; fixing a flexible printed board connected with a key board and a signal processing board of the key module on the back of a thin plate in the box body part and completing wiring between the key board and the signal processing board; and installing a conductive circular sealing strip in a circular sealing strip installation groove which is preset in the inner side of the box body frame of the box body component, and fixing the cover plate on the box body frame through a stainless steel fastener.

The invention has the beneficial effects that:

1. dividing the display control terminal into a plurality of functional components: each component can be independently applied to other terminal products, so that the development and production cost of subsequent equipment is reduced, the popularization and application of the product are facilitated, and the whole assembly process is more convenient and faster due to the modularized installation;

2. the full-lamination process tightly combines touch control and display components such as a capacitive touch screen and a liquid crystal panel, meets the requirement of lightness and thinness, improves the strength of each component, effectively reduces the interference of noise on touch control signals, and improves the smooth feeling of touch control operation;

3. the backlight components which are tightly stacked and installed realize the use requirement of lightness and thinness on one hand, and avoid the physical damage of the light guide plate and the diaphragm caused by the friction and the collision between the optical elements in the vibration environment on the other hand, fully utilize the excellent characteristics of each optical element, provide continuous and uniform light sources for the liquid crystal panel and improve the integral display effect of the liquid crystal panel;

4. the internal structure of the box body part adopts a structural form of combining the side wall of the box body, a thin plate and a truss girder, higher structural rigidity is achieved under the requirement of thinner total thickness, the parts installed in the box body are protected against vibration and impact and the like, the rear end of the box body part is connected with the cover plate to form mechanical closure of the box body structure, and the improvement of the inherent frequency of the whole machine is realized;

5. the cover plate component can realize sealing with the box body component, and meanwhile can provide mounting and supporting spaces for an electric connector, a power filter, a power panel, a backlight driving board, a signal processing board and the like, and provide a mounting surface for a bracket of the display control terminal;

6. the key module convenient to assemble has a good waterproof sealing effect and can realize effective electromagnetic shielding;

7. the box body component and the cover plate component are provided with the conductive rubber sealing strips to improve the sealing effect and the electromagnetic shielding effect, and the fasteners between the box body component and the cover plate component are made of stainless steel materials with good salt spray and mould resistance, so that the capability of resisting severe environment from parts to the whole machine is improved, and the product is prevented from being damaged by humidity, salt spray and mould;

8. after the box body part and the display and control part are attached to each other, the box body part and the display and control part are sealed by elastic sealant, so that the box body part and the display and control part are tightly connected, and the sealing effect and the electromagnetic shielding effect are improved;

7. the three-level conduction heat dissipation structure fully utilizes the good heat conduction performance and the larger heat dissipation area of each level of conduction material, has good heat dissipation effect, and ensures the luminous efficiency of the LED backlight source in the display control terminal and the stability of the high-temperature work of the liquid crystal panel;

9. the liquid crystal display panel is directly and efficiently heated in a low-temperature environment by adopting closed-loop design of temperature acquisition and monitoring, heating starting and heating drive control, so that the low-temperature quick starting of the liquid crystal display panel is realized;

11. the fully-laminated optical binding and laminating reinforced glass improves the rigidity and natural frequency of the display and control component; meanwhile, a non-resonant vibration absorber is adopted as a primary vibration isolation measure of the terminal mounting bracket, so that the natural frequency of the whole terminal is further reduced, the terminal resonance caused by external excitation is avoided, and the received vibration stress is reduced;

12. the box body and the cover plate are made of aluminum alloy, and the terminal is guaranteed to have good shielding performance under a severe electromagnetic environment through conductive oxidation.

Drawings

Fig. 1 is a schematic flow chart of a method for manufacturing a ruggedized display and control terminal according to an embodiment of the present invention;

fig. 2 is a schematic composition diagram of a ruggedized display and control terminal according to an embodiment of the present invention;

fig. 3 is a front end outline view of a ruggedized display and control terminal according to an embodiment of the present invention;

fig. 4 is a back outline view of a ruggedized display and control terminal according to an embodiment of the present invention;

FIG. 5 is a schematic diagram illustrating a display and control unit according to an embodiment of the present invention;

fig. 6 is a schematic diagram of all optical binding of a display and control component according to an embodiment of the present invention;

FIG. 7 is a schematic partial cross-sectional view of a display and control unit according to an embodiment of the present invention;

FIG. 8 is a schematic diagram illustrating a liquid crystal panel of the display and control unit according to an embodiment of the present invention;

FIG. 9 is a schematic diagram illustrating the components of a backlight assembly according to an embodiment of the present invention;

FIG. 10 is a schematic diagram illustrating an arrangement of LED backlights in the backlight assembly according to the embodiment of the present invention; (ii) a

FIG. 11 is a schematic view illustrating a composition of a composite film in a backlight unit according to an embodiment of the present invention;

FIG. 12 is a front view of a housing component according to an embodiment of the present invention;

FIG. 13 is a rear view of a housing component according to an embodiment of the invention;

FIG. 14 is a schematic view of an installation structure of a box member and a display control member according to an embodiment of the present invention;

FIG. 15 is a schematic view of a portion of the area of FIG. 13;

FIG. 16 is a schematic view of an installation structure of the case member and the cover member according to the embodiment of the present invention;

fig. 17 is a schematic diagram illustrating a key module according to an embodiment of the present invention;

fig. 18 is a schematic structural diagram of a rubber key in the key module according to the embodiment of the present invention;

FIG. 19 is a front view of a cover member according to an embodiment of the present invention;

FIG. 20 is a rear view of a cover member according to an embodiment of the present invention;

FIG. 21 is a schematic view of a three-level conductive heat dissipation structure in accordance with the practice of the present invention;

fig. 22 is a schematic diagram of the connection between the key sheet and other flexible sheets according to the embodiment of the present invention.

In the figure, the position of the upper end of the main shaft,

1. a display control component; 2. a backlight section; 3. a case member; 4. a cover member; 5. a rectangular groove; 6. a light-sensitive sensor; 7. a heating/pilot operating light; 8. protective glass; 9. a capacitive touch screen; 10. an EMI electromagnetic shielding film; 11. a liquid crystal panel; 12. heating glass by using ITO; 13. optical cement; 14. sealing glue; 15. a liquid crystal panel driving board; 16. double-sided adhesive tape foam; 17. an FPC flexible printed board; 18. a front polarizer; 19. a front glass substrate; 20. a liquid crystal layer; 21. a rear glass substrate; 22. a rear polarizer; 23. an upper diffusion film; 24. compounding film; 25. a light guide plate; 26. a reflective film; 27. fixing glue for the membrane; 28. an upper prism; 29. a lower prism; 30. a lower diffusion film; 31. a box frame; 32. a truss; 33. a thin plate; 34. perforating the FPC through threading; 35. elastic sealant; 36. an adhesive; 37. an elastic conductive material mounting groove; 38. a circular sealing strip mounting groove; 39. a conductive circular seal strip; 40. a cover plate; 41. a rubber key group; 42. pressing a plate; 43. a key sheet; 44. a screw and a nut; 45. an LED lamp; 46. a microswitch; 47. a rubber key; 48. an indicator light flexible panel; 49. a switch hole; 50. a lamp hole; 51. a double-layer waterproof wall; 52. a power panel; 53. a signal processing board; 54. a power supply filter; 55. a backlight driving board; 56. an electrical connector; 57. a fin heat dissipation structure; 58. a bracket mounting hole; 59. an aluminum substrate PCB board; 60. an array of LED particles; 61. heat conducting glue; 62. a sensor flexible plate.

Detailed Description

The present invention will be described in further detail below with reference to specific embodiments and with reference to the attached drawings.

As shown in fig. 1, a method for manufacturing a ruggedized display and control terminal according to an embodiment of the present invention includes:

step 1, respectively manufacturing five functional components of the display and control terminal, namely a display and control component 1, a backlight component 2, a box body component 3, a cover plate component 4 and a key module.

As shown in fig. 2 to 4, the reinforced display and control terminal to be manufactured by the present invention is divided into a plurality of functional components: the display control component 1, the backlight component 2, the box body component 3, the cover plate component 4 and the key module are arranged on the base, each component can be independently applied to other terminal products, and the whole assembly process is more convenient and faster due to the modularized installation. The front surface is a display and control component 1 which is formed by a touch screen, a liquid crystal panel and the like and is in a full-lamination process form, and operation functions such as display, touch control and the like are completed; the left side and the right side of the display and control component 1 are respectively provided with an external light sensor and a heating/running indicating lamp to complete the functions of automatic dimming and indication of the running state of the whole machine. The middle part is a backlight component 2 and a box body component 3, the backlight component 2 provides uniform and reliable backlight for the liquid crystal panel, the display control terminal is ensured to obtain sufficient brightness and brightness uniformity, the box body component 3 provides reliable structural support for the whole machine, and effective and rapid conduction and heat dissipation are provided for the backlight component 2; the box body is made of a superhard aluminum alloy material, and an integrated integral design is combined with a locally reinforced structural form, so that the box body has higher rigidity and strength and provides the whole machine with vibration and impact resistance; the box body part is provided with a function key below, and the right side of the function key is provided with a manual backlight adjusting key. The rear end is a cover plate part 4, so that the installation of electrical parts is realized, the functions of power supply, signal display, communication information transmission and the like are completed, a reliable heat dissipation way is provided for high-power devices, and the reliable sealing of the whole machine is realized after the cover plate part is assembled with the box body part 3.

The features of each individual functional component and its method of fabrication are described below.

The main functions of the display and control component 1 are: (1) providing information display such as characters, graphs and images for vehicle passengers; (2) providing a display area touch function for the passenger and supporting glove-wearing touch operation; (3) the display control component is matched with a box body structure of the display control terminal to realize waterproof sealing, dust prevention and electromagnetic shielding of a display window area; (4) the ITO heating glass realizes the heating starting of the liquid crystal panel at low temperature.

The display control component is shown in fig. 5-7, when manufacturing, firstly, the protective glass 8, the capacitive touch screen 9, the EMI electromagnetic shielding film 10, the liquid crystal panel 11, the ITO heating glass 12, the touch screen FPC and the liquid crystal screen FPC are manufactured in advance, then, the capacitive touch screen 9 is completely attached to the back surface of the protective glass 8 through the optical adhesive 13, the EMI electromagnetic shielding film 10 is completely attached to the back surface of the capacitive touch screen 9 through the optical adhesive 13, the liquid crystal panel 11 is completely attached to the back surface of the EMI electromagnetic shielding film 10 through the optical adhesive 13, the ITO heating glass 12 is completely attached to the back surface of the liquid crystal panel 11 through the optical adhesive 13, the capacitive touch screen 9 is connected with the touch screen FPC, and the liquid crystal panel 11 is connected with the liquid crystal screen FPC.

In order to meet the use requirement under the severe environment, the protective glass 8 is made of tempered glass, has the characteristics of firmness, thinness and thinness, can play a good role in protecting and reinforcing other functional components in the whole display and control component, and can ensure the sensitivity and accuracy of the response of the capacitive touch screen 9. The protective glass 8 is located at the outermost side, has higher strength, good impact resistance and surface abrasion resistance by chemical strengthening means, and provides structural rigidity and a protective function for the liquid crystal panel 11 and other components. The capacitive touch screen 9 provides a multi-point reliable touch man-machine interaction function for the display control terminal, and has an ultralow electromagnetic radiation characteristic.

In order to solve the electromagnetic compatibility problem, the back surface of the capacitive touch screen 9 is attached with an EMI electromagnetic shielding film 10, the EMI electromagnetic shielding film 10 is formed by plating a metal wire mesh film on a PET base material, and a very thin electromagnetic shielding film of the metal wire mesh film is formed on the surface of the PET base material by a physical (cathode sputtering, vacuum evaporation and the like) method to form a complete conductive layer, so that the electromagnetic shielding effect is achieved. The EMI electromagnetic shielding film 10 can better ensure the light transmittance of the display component, has good conductivity, light transmittance, flexibility and stability, can be well connected with the metal frame, has better visual effect after adopting the full-lamination process, and avoids optical interference phenomena such as parallax error, double image, light reflection, Newton's ring and the like easily occurring in the traditional window shielding scheme.

As shown in fig. 8, the liquid crystal panel 11 includes a front polarizer 18, a front glass substrate 19, a liquid crystal layer 20, a rear glass substrate 21, and a rear polarizer 22, which are stacked in sequence from outside to inside; the joint of the liquid crystal layer 20 and the front glass substrate 19 and the joint of the liquid crystal layer 20 and the rear glass substrate 21 are sealed by sealing glue 14; the length of the rear glass substrate 21 is greater than that of the front glass substrate 19, and the FPC flexible printed board 17 is bonded to the front surface of the rear glass substrate 21 at a portion of the rear glass substrate 21 that is longer than the front glass substrate 19. The liquid crystal layer 20 is arranged between the two glass substrates, the liquid crystal layer is a tiny liquid crystal box formed by photoetching, liquid crystal materials are filled in the tiny liquid crystal box, and the periphery of the panel is sealed by sealing materials. The thicknesses of the front glass substrate 18 and the rear glass substrate 19 are both less than 0.5 mm. As can be seen from the structure of the liquid crystal panel, although the liquid crystal cell supports the liquid crystal panel, the liquid crystal panel having a large area and a small thickness is subjected to vibration, which causes a large displacement of the panel in the normal direction thereof, and the vibration causes stress to be generated in the liquid crystal panel, resulting in a change in the thickness of the liquid crystal cell, and thus a change in the quality of a displayed image. Under severe environmental conditions such as extreme temperature, vibration impact, humidity, salt fog and the like, the liquid crystal glass substrate is easily damaged, and a part of TFT array electrodes etched on the glass substrate is electrically connected with a driving circuit to be open or short, so that flicker can occur, a dark color or black image can be displayed more obviously, for example, white spots or uneven black and white can occur, normal display of a picture is influenced, and a display device can be subjected to unrecoverable permanent damage. Therefore, in order to enable the display device to operate normally in the above-described severe environment, the liquid crystal panel 11 is designed to be reinforced.

And the front end reinforced glass (protective glass 8 and the capacitive touch screen 9) and the rear end reinforced glass (ITO heating glass 12) are packaged and attached with the liquid crystal panel 11 through the optical cement 13 by adopting a full-attaching process to form an integrated reinforced module. The reinforcing mode modularly reinforces the weakest part in the liquid crystal panel 11, greatly improves the rigidity strength of the liquid crystal panel 11 after reinforcement, improves the natural frequency of the liquid crystal panel 11, avoids the natural frequency of the whole display control terminal, avoids damage to the liquid crystal panel 11 caused by resonance damage, and realizes structural reinforcement of a key display device. Meanwhile, the optical cement 13 and the reinforcing glass (the cover glass 8, the ITO heating glass 12) serve as a damping element and an elastic element of the main isolation buffer, and can absorb and dissipate vibration energy. The stiffness coefficient and the damping coefficient of the optical cement 13 determine the natural frequency of the optical cement 13, and the natural frequency of the laminating layer can be changed by changing the optical cement 13, so that the vibration natural frequency of the isolation buffer is influenced. By selecting the optical glue and the glue layer with different types, the vibration isolation buffering effect with different characteristics can be obtained, so that the transmission of vibration energy between the liquid crystal panel and the excitation source is avoided and isolated, the vibration energy is effectively attenuated, and the resonance between the liquid crystal panel and the vibration source is avoided. Besides effectively improving the vibration and impact resistance of the liquid crystal panel 11, the display and control component after being bonded and reinforced by adopting a full-lamination process can avoid the problems of optical interference, optical reflection loss and the like caused by the traditional display window integration mode.

The liquid crystal panel driving board 15 is connected with the EMI electromagnetic shielding film 10 through the double-sided tape foam 16, the liquid crystal panel driving board 15 is electrically connected with the liquid crystal panel 11 through the FPC flexible printed board 17, two ends of the FPC flexible printed board 17 are connected to the liquid crystal panel driving board 15 and the liquid crystal panel 11 through the ACF tape, respectively, and an end portion connected with the liquid crystal panel driving board 15 is connected with the double-sided tape foam 16. The FPC flexible printed board 17 is COF, and is pasted with conductive shielding cloth. Cof (chip On film) is used for picture control and signal transmission between the liquid crystal panel 11 and the liquid crystal panel driver board 15, and is formed by polyimide film built-in conductive circuits, the whole material is soft, and two ends of the cof (chip On film) are connected to the liquid crystal panel driver board 15 and the liquid crystal panel 11 by using ACF (anisotropic conductive adhesive) glue. The amount of deformation of the COF during vibration is large with respect to the liquid crystal panel drive board 15 and the liquid crystal panel 11. The mechanical connection and electrical conduction between the COF and the liquid crystal panel driving board 15 and the liquid crystal panel 11 are important factors for ensuring the display function and reliability of the liquid crystal panel, and the liquid crystal panel 11 may have a failure phenomenon, such as a screen defect, a line defect or a tape defect, due to poor contact or breakage. Protective glass 8, capacitive touch screen 9 and EMI electromagnetic shielding film 10 constitute three laminating subassemblies, and LCD panel 11 adopts optical cement 13 and three laminating subassemblies to laminate, and COF and LCD panel drive plate 8 are all fixed with three laminating subassemblies through double faced adhesive tape bubble cotton 9. In addition, in order to realize high-reliability mechanical connection and electrical conduction between the COF and the liquid crystal panel driving board 15, binding process parameters are optimized, binding precision is improved, and high-strength ACF glue is selected to bind the connecting parts again, so that the vibration resistance of the two connecting parts is enhanced, and meanwhile, the tensile resistance of the connecting parts is improved. The fully-laminated structure ensures that the COF cannot generate large deformation in the vibration process, so that the damage caused by the COF body and the poor contact between the COF and the liquid crystal panel 11 and between the COF and the liquid crystal panel driving board 15 are avoided.

For a display device, temperature mainly affects a liquid crystal panel and a backlight unit. Liquid crystal materials are very sensitive to temperature changes, affecting the response time of the liquid crystal and the threshold voltage of the liquid crystal. The liquid crystal material becomes viscous at low temperature, the response speed becomes slow, and the dynamic image has trailing phenomenon and even can not be displayed; if the temperature is too low, the liquid crystal state disappears and becomes crystalline, and in this case, permanent damage may occur due to the destruction of the alignment layer during the formation of the crystals; when the temperature is too high, the performance of the glue, the adhesive and the packaging material for packaging the liquid crystal screen is reduced and degraded, which may cause the display device to work abnormally. Aiming at the condition that the liquid crystal panel 11 can not work normally in a low-temperature environment, the ITO film-coated glass (ITO heating glass 12) is completely attached to the back surface of the liquid crystal panel 11 and used as a heating sheet to directly perform low-temperature heating compensation on the liquid crystal panel, and the liquid crystal panel is directly and efficiently heated in the low-temperature environment, so that the low-temperature quick start of the liquid crystal panel is realized. When current passes through the ITO coating film, heat generated by the resistance of the ITO coating film is transferred to the liquid crystal panel 11 attached to the ITO coating film, so that the liquid crystal panel meets the temperature requirement required by normal operation.

During manufacturing, the edge of the ITO heating glass 12 exceeds the edge of the liquid crystal panel 11, the edge of the ITO heating glass 12 is bonded with the three-lamination assembly through the sealing compound 14, and the sealing compound 14 seals the periphery of the liquid crystal panel 11. The bonding and sealing mode can ensure that the structure of the display control component is firmer, the structural stress is directly born by the reinforced glass (the protective glass 8 and the ITO heating glass 12) on the inner side and the outer side, the liquid crystal panel 11 does not bear the damage caused by the stress, meanwhile, the sealing treatment on the periphery of the liquid crystal panel 11 is realized, the damage of the sealing glue 14 at the position of the liquid crystal panel 11 by the low-air-pressure environment can be effectively avoided, and the use requirement of the display component in the high-altitude low-air-pressure environment is met. The bonding of the reinforcing glass having the same thickness to the front and rear sides of the liquid crystal panel 11 is most advantageous for reducing the local stress of the liquid crystal layer, and prevents resonance due to the non-uniform displacement of the front and rear glass substrates at the resonance frequency.

The display control component 1 adopts a full-lamination process to completely paste optical glue for optical components such as protective glass 8, a capacitive touch screen 9, an EMI electromagnetic shielding film 10, a liquid crystal panel 11, ITO heating glass 12 and the like together in a seamless mode. Compared with the traditional display area integration mode, the full-lamination process eliminates the air layer between each layer of assembly, also eliminates multiple reflections caused by light passing through the interfaces of each layer of assembly and air, and can greatly improve the problems of glare and insufficient brightness. The common integration mode is easily polluted by dust and water vapor of the environment due to the existence of air layers among all layers of components, and the use of the display control component is influenced. And adopt full laminating technology, filled the space between each layer subassembly with the optical cement, closely laminate between each layer subassembly, isolated dust and steam, can keep the cleanliness factor in display area for a long time. The full-lamination process tightly combines touch control and display components such as a capacitive touch screen and a liquid crystal panel, can improve the strength of each component, can effectively reduce the interference of noise to touch control signals, and improves the smoothness of touch control operation.

In addition, the existing display and control terminal is generally of a panel-pressing frame reinforcement type or a frame pasting type, most touch screens are resistance or infrared touch screens, screen mesh laminated glass or ITO (indium tin oxide) coated glass is generally adopted for window shielding, the thickness of a formed window protection part is large, the whole thickness is large after the window protection part is assembled and combined (not fully laminated) with a liquid crystal screen, and the requirement of light and thin is not met. This scheme adopts the integrated and reinforcement design, with each independent functional unit such as protective glass 1, capacitive touch screen 2, EMI electromagnetic shield membrane 3, liquid crystal display panel 4 and ITO heating glass 5 laminate integratively in an organic whole completely, forms the integral part of complete function, and the whole thickness of the accuse part that shows after the optics laminating is far less than prior art's thickness, has satisfied frivolous demand.

The main functions of the backlight unit 2 are to provide light emission, light guiding, reflection, light uniformization (diffusion), light collection, light recycling, and the like, and to provide a uniform surface light source for the liquid crystal panel 11. As shown in fig. 9, in the backlight unit 2, an upper diffusion film 23, a composite film 24, a light guide plate 25, a reflective film 26, and an LED backlight are prepared in advance, and then the edge of the composite film 24 is attached to the back surface of the upper diffusion film 23 by a film fixing adhesive 27, the edge of the light guide plate 25 is attached to the back surface of the composite film 24 by a film fixing adhesive 27, the reflective film 26 is attached to the back surface of the light guide plate 25 by a film fixing adhesive 27, and the LED backlight is disposed at the side edge of the light guide plate 25.

In order to ensure the quality of the display image, adapt to the external dimension of the display control terminal and meet the requirements of the use environment of the display control terminal, the backlight component 2 has the characteristics of high brightness, uniform light emission, large illumination angle, high lighting effect, low power consumption, long service life, light weight, thinness and the like. Compared with CCFL and EL light sources, the LED backlight source has the advantages of high brightness, high color purity, long service life, strong adaptability, high reliability, low cost and the like. According to the difference of the distribution positions of the LED backlight sources, the side-in type LED backlight is adopted, and the requirement of product lightness and thinness is met. The backlight component 2 uses various optical elements, the optical films and the light guide plate are integrally formed into an integral component in a close stacking installation mode, and the integral component is integrally installed in a box body structure of the display control terminal by using an elastic material in specific application, so that the influence on the display effect of the liquid crystal panel 11 caused by the physical damage of the light guide plate and the films due to the friction and collision between the optical elements in a vibration environment is avoided.

Specifically, as shown in fig. 10, the LED backlight source includes an aluminum-based PCB and an LED array uniformly arranged on the aluminum-based PCB, where the LED array is composed of a plurality of LED particles arranged in parallel, and each LED particle is composed of a plurality of LED particles connected in series. The LED backlight arranges in a series-parallel combination mode, and the mode of arranging is mostly the concentrated range of every group series connection LED granule, is favorable to laying wire and test like this, reduces the wiring space, reduces lamp strip width, is favorable to spatial layout. Under the high temperature environment, can influence the life of LED granule, adopt transparent epoxy resin packaging material, it is better than conventional silica gel material heat resistance, more do benefit to the heat dissipation. When the backlight component is applied to the display and control terminal, the aluminum substrate PCB is bonded on the box body of the display and control terminal through the flexible heat conduction material, and when the uniform requirement of the brightness of the light source is ensured, the heat generated by the light source is dissipated through the box body structure in a heat conduction mode. The use of large light emitting angle LED particles can reduce the dark area location and size of the backlight. Meanwhile, all LED particles of the LED backlight source are designed on a strip-shaped aluminum substrate, and the available space in the display and control terminal is ensured due to the ultrathin design; during assembly, the aluminum substrate is tightly attached to the box structure of the display control terminal, so that good heat dissipation efficiency is realized, and long service life and reliable work of the LED lamp strip are guaranteed.

The LED backlight source is connected with the signal processing board 53 through the backlight driving board 55, and in order to realize the brightness adjustment of the LED backlight source, the backlight driving board 5 provides a constant current power supply for the LED backlight source, and simultaneously receives the PWM dimming signal sent by the signal processing board, and adjusts the magnitude of the output current, so that the reliable work of the LED backlight source and the adjustment of the backlight brightness can be realized.

The reflective film 26 is located below the light guide plate 25, and is made of a white high-reflection metal coating film made of a PET substrate, and is used for reflecting light refracted from the lower side of the light guide plate back to the light guide plate, so that the light use efficiency is improved.

The main functions of the light guide plate 25 are to guide the direction of light transmission to improve display brightness and to control brightness uniformity, and are important elements affecting light energy efficiency, and are also the most important optical elements in the side-type backlight assembly. The light enters from the side edge of the light guide plate 25, the refractive index is larger than that of air, and most of the light advances in the light guide plate in a total reflection mode; the surface of the lower part of the light guide plate 25, which is in contact with the reflective film, is of a point-like convex structure, when light reaches each dot, the reflected light can be scattered at each angle, total reflection conditions are destroyed, diffuse reflection pointing to the light-emitting surface is formed, and local luminous flux is increased. The common shapes of the light guide plate include a rectangular section and a wedge-shaped section. The wedge-shaped light guide plate has the advantages that the wedge-shaped light guide plate is thinner, the saved space is used for fixing an electrical board card on a display screen by a module end, and the wedge-shaped light guide plate has the defects of weak strength, poor shock and vibration resistance, high cost and the like, and a die needs to be opened for processing and forming. The invention adopts a rectangular light guide plate. The arrangement of the mesh points is one of the keys of the light guide plate structure, the common mesh point arrangement mode is a matrix type and a random number type, and the mesh points are round small points with different diameters. The dot arrangement directly influences the light guiding effect of the light guiding plate, and the matrix dot design is adopted in the embodiment, so that the brightness uniformity of the backlight component reaches 85%.

As shown in fig. 11, the composite film 24 is composed of an upper prism 28, a lower prism 29, and a lower diffusion film 30 stacked on an optical film, wherein the peaks of the upper prism 28 are uniformly arranged, the peaks of the lower prism 29 are arranged in a staggered manner, and the high peaks are bonded to the upper prism 28. The composite film 24 combines the functions of a diffusion sheet, a horizontal prism sheet and a vertical prism sheet on a film material, the ridges of the lower prism are processed into high-low staggered ridges, the high ridges are bonded with the upper prism, and the low ridges play the roles of the prism in receiving large-angle light and improving the light efficiency. The composite membrane material has the characteristics of thin thickness and excellent vibration performance. Compared with the structure of independent three-layer film materials, the composite film material has smaller overall thickness and better concealing effect and brightness gain effect.

The upper diffusion film 23 is made of polymer material as a base material and is formed by mixing and coating a plurality of micron-sized diffusion particles, and the difference of the surface microstructures of the product can cause different optical properties. The diffusion particles are dense, the atomization degree is high, the light rays entering the LED particles are scattered at the diffusion position, and the light rays are not easy to gather, so that the light spot phenomenon is not easy to occur at the lamp socket, and the whole display effect is improved.

As shown in fig. 12 to 13, in manufacturing the case member 3, the plurality of girders 32 are fixed to the case frame 31, the thin plate 33 is fixed to the girders 32, the case frame 31, the girders 32, and the thin plate 33 are integrally formed, the thin plate 33 divides the case frame 31 into a front end accommodating space and a rear end accommodating space, and the lower end of the case frame 31 is provided with the rectangular groove 5 for mounting the key module. The structural form that box frame lateral wall-sheet metal-truss combined together is adopted, realizes reaching higher structural rigidity under thinner thickness requirement, and the rear end forms the mechanics of box structure and seals through being connected with apron 40, realizes the reinforced characteristic of whole box part.

In order to reduce the weight and improve the structural strength and rigidity, the design of the superhard aluminum alloy box body is adopted, the box body frame 31, the truss girder 32 and the thin plate 33 are all made of aluminum alloy, the cover plate 40 which is installed in a matching mode is also made of aluminum alloy, and the aluminum alloy has high conductivity and good electromagnetic shielding performance. In addition, due to higher strength and good processability, the superhard aluminum alloy can ensure the processing precision and the surface roughness of structural parts, particularly matching surfaces (mounting matching surfaces of a box body part and a display control part, a backlight part and a cover plate part). After the box body part and the cover plate are processed, the surfaces of the box body part and the cover plate are subjected to conductive oxidation treatment by adopting a chemical conductive oxidation means, and the chemical conductive oxidation film has stronger corrosion resistance and absorption capacity and can achieve the purpose of protection besides improving the reflection loss of the material and keeping the long-term conductive performance. In addition, the outer surface of the display control terminal is coated with a material with strong adhesive force and good three-proofing performance, so that the corrosion resistance of the whole terminal can be improved.

As shown in fig. 17, in manufacturing the key module, the rubber key group 41, the pressing plate 42, and the key sheet 43 are fixed by screws and nuts 44, the sensor flexible sheet 62 and the indicator flexible sheet 48 are connected to the left and right sides of the key sheet 43, respectively, and the key sheet 43 is connected to a flexible printed board connected to the signal processing board 53. The key board 43 includes a PCB circuit board, LED lamps 45 and micro switches 46, the PCB circuit board is provided with a plurality of micro switches 46, two sides of each micro switch 46 are respectively provided with one LED lamp 45, and the rubber key group 41 includes an integrally formed rubber board and a plurality of rubber keys 47 located on the rubber board. The rubber plate and the rubber keys are integrally formed, so that the installation is simplified and the assembly is convenient. As shown in fig. 18, the rubber button 47 protrudes outward and is recessed inward to form a receiving cavity, which is in contact with the micro switch 46. The outward convex outer contour of the rubber key 47 is rectangular. The key material is silicon rubber which has excellent temperature resistance, weather resistance and corrosion resistance, and the PU coating is sprayed on the outer surface of the key to improve the wear resistance of the surface of the key. The double-layer waterproof wall 51 is arranged on the outer side of the rubber key 47, waterproof sealing of the key installation position is guaranteed, good sealing effect is achieved after the rubber key is assembled with the box body frame 31, and waterproof performance is improved. Meanwhile, after assembly, the periphery of the rubber key is tightly lapped with the box body frame 31, and a complete conductive shielding layer is formed on the inner layer, so that electromagnetic leakage at the key window is avoided. For assembly, a switch hole 49 through which the micro switch 46 passes and a lamp hole 50 through which the LED lamp 45 passes are formed at corresponding positions on the pressing plate 42. The pressing plate 42 is a metal plate made of superhard aluminum alloy, can play a role in fixing the rubber keys after being assembled, and can ensure that the double-layer waterproof wall of the rubber keys has certain compression amount, thereby ensuring that the waterproof structure plays a role in sealing. In addition, the pressing plate 42 is assembled to form continuous conductive contact with the case frame 31 made of aluminum alloy, and effective electromagnetic shielding at the opening of the key plate 43 is guaranteed. The number of the rubber keys 47 can be designed according to actual requirements, a plurality of function keys and a plurality of dimming keys are arranged on the key board 43, and each key is provided with independent backlight so as to facilitate observation and operation.

As shown in fig. 19 to 20, when the cover plate member is manufactured, an installation space for the power supply board 52, the signal processing board 53, the power supply filter 54 and the backlight driving board 55 is reserved on the front surface of the cover plate 40, and a fin heat dissipation structure 57 and an electrical connector 56 are provided on the back surface of the cover plate 40, and the designed power supply board 52, the signal processing board 53, the power supply filter 54 and the backlight driving board 55 are installed in the installation space on the front surface of the cover plate 40 according to requirements.

The cover plate 40 is integrally processed in a numerical control mode and assembled with the box body frame 31 of the display and control terminal, small screw holes matched with each other are formed in the positions, corresponding to the box body, of the four edges of the cover plate 40, the small screw holes are fixed through screws and nuts, and the cover plate is sealed for achieving water resistance, dust prevention and electromagnetic shielding after being matched with the box body frame 31. A large-area fin heat dissipation structure 47 is designed on the back surface of the cover plate 40, so that the internal temperature of the terminal is effectively reduced. The power panel 52 completes the power conversion function of the whole display and control terminal, has the function of power polarity reverse connection protection, completes the power overvoltage and overcurrent protection, and can drive the ITO heating glass 12 of the display and control component in the display and control terminal to work. The signal processing board 53 completes the interaction and processing of external and internal information, external display signal transmission, processing and uploading of touch information and key information, control of the light intensity sensor and the status indicator lamp, calculation of internal temperature information and control of the heating circuit. The power filter 54 performs filtering processing to eliminate power interference of an external power system to the display and control terminal, so that the power system of the display and control terminal meets the requirement of electromagnetic compatibility. The backlight driving board 55 provides a plurality of constant current power supplies of maximum 120mA for the LED backlight of the backlight unit in the display control terminal, and receives the PWM dimming signal (manual or automatic adjustment) from the signal processing board 53 to adjust the output current, so as to implement reliable operation of the LED backlight and adjustment of the backlight brightness.

The cover plate 40 is mounted with a plurality of electrical connectors 56 on the back side, the electrical connectors 56 are circular electrical connectors, and the mounting end of each electrical connector 56 is provided with a conductive gasket, so that the leakage of electromagnetic gaps of the equipment at the connectors is reduced, and a good waterproof sealing function is provided. The cover plate 40 is provided with a plurality of bracket mounting holes 58, which is convenient for mounting the display control terminal on a bracket. Preferably, the number of bracket mounting holes 58 is 4. Through installing the no resonance shock absorber that natural frequency is low, response numerical value is little on the support, can reduce the natural frequency of whole apparent accuse terminal to keep apart most in-car vibration stress, make the vibration frequency that can reach the apparent accuse terminal body far less than the natural frequency of apparent accuse terminal body, thereby avoid external excitation to cause the terminal resonance, finally reduce the vibration stress that the apparent accuse part in the apparent accuse terminal received.

And 2, fixing the backlight component 2 in the front end accommodating space of the box body component 3 through an elastic damping material, and fixing the LED backlight source of the backlight component 2 on the inner side wall of the box body frame 31 in the front end accommodating space through a heat conducting glue 61.

Step 3, as shown in fig. 14-15, the display and control component 1 is installed above the backlight component 2, a certain gap of about 1mm is reserved between the display and control component 1 and the inner side wall of the box body frame 31 of the box body component 3, after the display and control component 1 is attached to the inner side wall of the box body frame 31 through a detachable adhesive 36, the gap is sealed by an elastic sealant 35 for peripheral gluing, a continuous conductive elastic material is embedded into an elastic conductive material installation groove 37 which is preset on the inner periphery of the box body frame 31, and the touch screen FPC and the liquid crystal screen FPC are respectively inserted into the rear end accommodation space of the box body frame 31 from two FPC threading open holes 34 on the box body frame 31.

The display and control component and the box body component are attached by frame attaching, so that the bonding reliability of the display and control component 1 and the box body frame 31 is ensured. The frame pastes and provides sufficient bonding strength for showing accuse terminal, still has sealed function. After the display and control component is bonded with the box frame 31, the conductive elastic material is effectively compressed under the combined action of the display and control component and the box frame 31, and fully contacts with the EMI electromagnetic shielding film 10 on the display and control component 1 to form continuous conductive sealing on a display window area. Preferably, the conductive elastic material is conductive foam. In order to reduce the electromagnetic radiation leakage of the rear end electric part of the box body part from the opening to the front end of the box body part and reduce the electromagnetic leakage of a display window in the display control part, the width of the FPC threading open hole is reduced as much as possible on the premise of ensuring the assembly manufacturability and the processing manufacturability.

When the display and control component 1 is installed, firstly, the display and control component 1 is installed at the front end of the box body frame 1 in a bonding mode through a tool fixture, and the fixture is used for ensuring that the peripheral width of a glue applying space reserved between the display and control component 1 and the front side wall of the box body frame 1 is consistent; then, automatic and accurate sizing is realized through automatic sizing equipment; and finally, quickly curing. The removable adhesive 36 has good adhesive properties, forms a tough elastomer after curing, has excellent three-proofing properties, and meets the requirements of the product for appearance. Accurate counterpoint crimping is realized to automatic glueing equipment, guarantees to show and reaches the even unanimity in peripheral clearance after accuse part and the laminating of box frame 1, has solved manual assembly or only leans on crimping equipment to counterpoint when laminating inconsistent, the laminating yields low problem in peripheral clearance. The automatic glue applying device can preset glue outlet amount, glue applying time, glue applying speed and glue applying path according to the requirements of a laminating process, has high glue applying accuracy, good glue amount control, stable glue outlet amount and no glue leakage, can automatically identify the glue applying path without being limited by a complex path and a shape, can be adjusted on line according to actual conditions, realizes the rapidness, high precision and zero error of the glue applying process, and can realize the full automation of the glue applying process.

And 4, installing the rubber key group 41 in the rectangular groove 5, clamping and fixing the sensor flexible plate 62 and the indicator light flexible plate 48 on the back of the thin plate 33 in the box body part 3, installing the touch screen driving plate on the back of the thin plate 33, and connecting the touch screen FPC and the key plate 43 and clamping and fixing the touch screen FPC and the key plate on the back of the thin plate 33.

The left and right sides of the lower end of the display and control component 1 are respectively provided with a light sensation sensor 6, a temperature sensor and a heating/indicating operation lamp 7, as shown in fig. 22, the light sensation sensor 6 and the temperature sensor are installed on a sensor flexible plate 62 at the rear side of the capacitive touch screen 9 and are connected with a key plate 43, the light sensation sensor 6 is overlapped with a transparent area on cover glass of the capacitive touch screen 9 through a light guide column, the illumination intensity of the external environment of the display and control component 1 is monitored, ambient illumination collection information is output to the signal processing plate 53, the temperature sensor monitors the temperature near the liquid crystal panel 11 in the display and control terminal box body, and temperature collection information is input to the signal processing plate 53. Heating pilot lamp (red) and operation pilot lamp (yellow) are installed on the pilot lamp flexbile plate 48 of capacitive touch screen 9 rear side to be connected with keypad 43, and heating/instruct transparent region coincidence on the cover plate glass of operating lamp and capacitive touch screen 9, red heating pilot lamp is lighted when low temperature heating, and yellow operation pilot lamp is lighted when the host computer work. The sensor flex 62 and the indicator flex 48 are securely plugged and easily released using snap-fit surface mount sockets.

Step 5, the power supply board 52, the signal processing board 53, the power supply filter 54 and the backlight driving board 55 are installed in the installation space on the front surface of the cover plate 40, and the wiring among the power supply board 52, the signal processing board 53, the power supply filter 54 and the backlight driving board 55 is completed. Wiring between the ITO heating glass 12 of the display control part 1 and the signal processing board 53, wiring between the backlight driving board 55 and the LED backlight of the backlight part 2, and wiring between the liquid crystal panel FPC and the signal processing board 53 are completed. A flexible printed board connecting the key sheet 43 of the key module and the signal processing board 53 is fixed to the back surface of the thin sheet 33 inside the case member 3, and wiring between the key sheet 43 and the signal processing board 53 is completed. As shown in fig. 16, a conductive circular weather strip 39 is attached to a circular weather strip attachment groove 38 provided in advance inside the casing frame 31 of the casing member 3, and a cover plate 40 is attached to the casing frame 31 in the rear end accommodation space by a stainless steel fastener.

In the above wiring, the signal processing board 53 is connected to the power board 52 through a power line, one end of the power filter 54 is connected to the power board 52 through a power line, one end of the backlight driving board 55 is connected to the signal processing board 53, the other end of the backlight driving board 55 is connected to the LED backlight of the backlight part 2, one end of the electrical connector 56 is connected to the other end of the power filter 54 through a power line, the other end of the electrical connector 56 is connected to the signal processing board 53 through a flexible printed board, and power supply is completed, the liquid crystal display panel in the display and control part is connected with the signal processing board 53 through the flexible printed board, so that the information transmission of the liquid crystal display panel in the display and control terminal is realized, the ITO heating glass 12 in the display and control part 1 is connected with the signal processing board 53 through the power line, and the key board 43 of the key module is connected with the signal processing board 53 through the flexible printed board, so that the transmission of the key information of the display and control terminal is realized.

Preferably, the circular sealing strip is an O-shaped ring with high conductivity, and the material is Ag-Cu. After the cover plate 40 is fastened with the box body frame 31, an installation and compression space of an O-shaped ring is formed between the groove feature and the inner wall of the side wall at the rear end of the box body frame 31, the cross section height of the O-shaped ring installation groove (namely the sealing element installation groove 38) is ensured to be consistent all the time, the O-shaped ring is ensured to obtain the compression amount with the consistent periphery, and the continuous and effective electromagnetic shielding between the cover plate 40 and the box body frame 31 is realized. The fastener between the box body frame 31 and the cover plate 40 adopts stainless steel screws and nuts, and has good salt spray prevention and mould prevention performances.

Because the display control terminal needs to normally work in the environment of 70 ℃, the service life, the reliability and the stability of the whole terminal can be ensured only by adopting heat dissipation design measures. The reinforced display and control terminal manufactured by the invention has a three-stage conduction and heat dissipation structure, and the heat in the display and control terminal is effectively managed. As shown in fig. 21, for the primary conductive heat dissipation structure, the aluminum substrate PCB 59 with excellent heat dissipation performance is used as the substrate of the LED backlight, so that the heat of the LED particles can be quickly conducted to the aluminum substrate PCB 59, and the LED particle array 60 is uniformly distributed in the length direction of the aluminum substrate PCB 59, thereby avoiding the heat accumulation at the center of the light source. For the secondary conduction heat dissipation structure, the aluminum substrate PCB 59 of the LED backlight source and the box body of the display control terminal are bonded by the heat conduction glue 61 with high heat conductivity coefficient at the mounting positions, the aluminum substrate 1 is hermetically attached to the box body frame 31, the infiltration rate of the bonding surface is improved, and a heat conduction glue pad is formed. The box body frame 31 is made of an aluminum alloy material with high thermal conductivity, so that the lowest thermal resistance in the link from primary heat conduction to secondary heat conduction is ensured, heat generated by the LED particles is quickly and effectively conducted to the box body frame 31, and the heat is quickly and effectively conducted to the outside of the display control terminal. For the three-level conduction heat dissipation structure, the heat conducted to the box frame 31 is conducted to the cover plate 40 through the combination surface of the side wall of the box frame 31 and the cover plate 40, the fin heat dissipation structure 57 is designed on the cover plate 40 to increase the heat dissipation area, and part of the heat is dissipated to the external environment through the cover plate 40. The three-level conduction heat dissipation structure fully utilizes the good heat conduction performance and the large heat dissipation area of all levels of conduction materials, has good heat dissipation effect, and ensures the luminous efficiency of the LED backlight source inside the display control terminal and the stability of the high-temperature work of the liquid crystal panel.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A manufacturing method of a reinforced display and control terminal is characterized by comprising the following steps:

step 1, respectively manufacturing five functional components of a display and control terminal, namely a display and control component (1), a backlight component (2), a box body component (3), a cover plate component (4) and a key module,

wherein the manufacturing method of the box body part (3) comprises the following steps: manufacturing an integrally formed box body frame (31), a plurality of trusses (32) and a thin plate (33), dividing the box body frame (31) into a front end accommodating space and a rear end accommodating space by the thin plate (33), and arranging a rectangular groove (5) for installing a key module at the lower end of the box body frame (31);

step 2, fixing the backlight component (2) in the box body component (3) through an elastic damping material, and hermetically connecting the LED backlight source of the backlight component (2) with the inner side wall of the box body component (3) through a heat conducting glue (61);

step 3, installing the display and control component (1) above the backlight component (2), and attaching the display and control component to the front end of the box component (3) through a detachable adhesive (36) frame and connecting the display and control component with the inner side wall of the box component (3) in a sealing manner;

step 4, mounting the key module in a rectangular groove (5) arranged at the lower end of the box body part (3);

and 5, fixing the cover plate component (4) at the rear end of the box body component (3) through a stainless steel fastener and connecting the cover plate component and the inner side wall of the box body component (3) in a sealing manner.

2. The manufacturing method according to claim 1, wherein in step 1: the capacitive touch screen (9) is completely attached to the back face of the protective glass (8) through the optical adhesive (13), the EMI electromagnetic shielding film (10) is completely attached to the back face of the capacitive touch screen (9) through the optical adhesive (13), the liquid crystal panel (11) is completely attached to the back face of the EMI electromagnetic shielding film (10) through the optical adhesive (13), and the ITO heating glass (12) is completely attached to the back face of the liquid crystal panel (11) through the optical adhesive (13), so that the display control component (1) is manufactured.

3. The manufacturing method according to claim 1, wherein in step 1: attach complex film (24) edge at the back of last diffusion barrier (23) through diaphragm fixed glue (27), light guide plate (25) edge is attached through diaphragm fixed glue (27) the back of complex film (24), and reflective film (26) are attached through diaphragm fixed glue (27) light guide plate (25) back to set up the LED backlight light guide plate (25) side edge is accomplished the preparation of backlight unit (2).

4. The manufacturing method according to claim 1, wherein in step 1: the key module is characterized in that a rubber key group (41), a pressing plate (42) and a key plate (43) are fixed through screws and nuts (44), a sensor flexible plate (62) and an indicator light flexible plate (48) are respectively connected to the left side and the right side of the key plate (43), a flexible printed board connected with a signal processing board (53) is connected to the key plate (43), and the key module is manufactured.

5. The manufacturing method of claim 1, wherein installation spaces of the power board (52), the signal processing board (53), the power filter (54) and the backlight driving board (55) are reserved on the front surface of the cover board (40), a fin heat dissipation structure (57) and an electrical connector (56) are arranged on the back surface of the cover board (40), and the designed power board (52), the signal processing board (53), the power filter (54) and the backlight driving board (55) are installed in the installation space on the front surface of the cover board (40) according to requirements, so that the manufacturing of the cover board component is completed.

6. The manufacturing method according to claim 1, wherein in step 2: and fixing the backlight component (2) in a box body frame (31) in a front end accommodating space of the box body component (3) through an elastic damping material, and fixing an LED backlight source of the backlight component (2) on the inner side wall of the box body frame (31) in the front end accommodating space through a heat conducting glue (61).

7. The manufacturing method according to claim 1, wherein in step 3: show accuse part (1) with reserve certain clearance between box frame (31) inside wall of box part (3), will through dismantling adhesive (36) show that accuse part (1) frame is pasted back on box frame (31) inside wall uses sealed glue of elasticity (35) to carry out peripheral gluing in the clearance and seals continuous electrically conductive elastic material of embedding in box frame (31) inboard periphery sets up elasticity electrically conductive material mounting groove (37) in advance, follows touch-sensitive screen FPC and LCD screen FPC respectively two FPC threading trompils (34) on box frame (31) wear the cabin extremely in the rear end accommodation space of box frame (31).

8. The manufacturing method according to claim 4, wherein in step 4: will rubber key group (41) is installed in rectangular channel (5), will sensor flexible sheet (62) with pilot lamp flexible sheet (48) joint is fixed the inside sheet metal (33) back of box part (3), and install the touch-sensitive screen drive plate sheet (33) back, and with touch-sensitive screen FPC with key board (43) are connected and the joint is fixed sheet metal (33) back.

9. The manufacturing method according to claim 5, wherein in step 5: mounting the power supply board (52), the signal processing board (53), the power supply filter (54) and the backlight driving board (55) in a mounting space on the front surface of the cover plate (40), and completing wiring among the power supply board (52), the signal processing board (53), the power supply filter (54) and the backlight driving board (55);

completing wiring between the ITO heating glass (12) of the display and control component (1) and the signal processing board (53), wiring between the backlight driving board (55) and the LED backlight source of the backlight component (2), and wiring between a liquid crystal screen FPC and the signal processing board (53);

fixing a flexible printed board connected with a key board (43) and a signal processing board (53) of the key module on the back of a thin plate (33) in the box body part (3) and completing wiring between the key board (43) and the signal processing board (53);

a conductive circular seal strip (39) is installed in a circular seal strip installation groove (38) which is preset in the inner side of a box body frame (31) of the box body part (3), and then the cover plate (40) is fixed on the box body frame (31) through a stainless steel fastener.