Machine-mounted beveled angle reinforced liquid crystal display module

Abstract

The invention belongs to the technical field of airborne cockpit display, and particularly relates to an airborne beveled angle reinforced liquid crystal display module. Comprising a liquid crystal screen, anti-reflection shielding glass, ITO heating glass, optical-grade bonding glue and a backlight assembly. The antireflection shielding glass and the ITO heating glass are respectively adhered to the front and the back of the liquid crystal screen through optical-grade adhesion glue; a backlight assembly is arranged behind the ITO heating glass; the anti-reflection shielding glass is bonded in the metal front frame through the conductive foam.

Description

Technical Field

[0001] The invention belongs to the technical field of airborne cockpit display, and in particular relates to an airborne chamfered corner reinforced liquid crystal display module. Background Art

[0002] LCD screens are widely used in industry, vehicles and special equipment due to their high reliability, high maturity and processability. The working environment of special equipment is relatively harsh, and there are high requirements for the strong light readability, high and low temperature resistance, vibration and shock resistance, night vision compatibility and electromagnetic compatibility of LCD screens. Therefore, the original LCD screen needs to be reinforced. In some application scenarios of special equipment, due to the limitation of installation space, it is impossible to directly select shelf-sized LCD screens. If the size is customized by re-opening the mold, there are disadvantages such as high cost, long cycle and poor sustainability. Therefore, it is necessary to consider secondary processing of LCD screens of suitable size, and meet the use requirements of special equipment through special processing processes such as cutting and packaging. Summary of the invention

[0003] The purpose of the present invention is to provide an airborne bevel-cut reinforced liquid crystal display module to solve the problems of strong light readability, high and low temperature resistance, vibration and shock resistance, night vision compatibility and electromagnetic compatibility of bevel-cut liquid crystal display products in an airborne environment.

[0004] Technical Solution

[0005] An airborne bevel-cut corner reinforced liquid crystal display module, comprising: a liquid crystal screen, an anti-reflection shielding glass, an ITO heated glass, an optical-grade bonding adhesive, and a backlight assembly;

[0006] The anti-reflection shielding glass and ITO heating glass are bonded to the front and back of the LCD screen respectively by optical-grade bonding adhesive, which reinforces and protects the LCD screen itself. The shielding glass on the front has a certain protective effect against complex electromagnetic environments.

[0007] A backlight assembly is set behind the ITO heated glass; the backlight assembly mainly includes a backlight and a light guide plate. The backlight consists of a group of white lights and a group of colored lights (red, green, and orange). In day mode, white lights are used to increase display brightness, and in night mode, only colored lights are used to reduce radiance to meet night vision compatibility requirements. The light guide plate is made of optical grade polycarbonate, and concave spherical dots are engraved on its surface to achieve the effect of transforming a point light source into a uniform surface light source.

[0008] The anti-reflection shielding glass is bonded to the metal front frame through conductive foam, and the gap is filled with 703 black silicone rubber to form a closed structure.

[0009] Furthermore, the liquid crystal screen is a pentagonal structure formed by chamfering one corner of a rectangle.

[0010] Furthermore, the LCD screen bevel cutting method is as follows: the LCD screen is fixed by vacuum adsorption, the pixel unit is found through fine adjustment, the pixel unit is aligned with the light-transmitting median area, the cutting line of the LCD screen is determined, the cutting position avoids the pixel unit crystal position, and the excess part is removed along the cutting line using an LCD screen laser cutting machine with an accuracy of not less than ±0.1mm.

[0011] Furthermore, the LCD screen is sealed after being beveled by the following method: the cut is sealed with curing UV glue, the UV glue is infiltrated after the sealing is completed, and the sealing glue is completely cured by UV irradiation lamp after the infiltration.

[0012] Based on the conventional LCD screen, an LCD screen laser cutting machine with an accuracy of not less than ±0.1mm is used to cut out the original screen of suitable size along the cutting line, and the incision is quickly sealed with curing glue. The quality of the original screen is verified through environmental stress screening and testing.

[0013] Furthermore, the time from the completion of cutting to the completion of sealing does not exceed L seconds, where L is the length of the incision in mm.

[0014] Furthermore, the glue penetration time is 30s to 40s.

[0015] Furthermore, the optical-grade bonding adhesive is a heat-curing silicone adhesive with a controlled curing time of 60h to 70h. The performance indicators after curing are as follows: hardness of 30HA to 40HA, bonding strength greater than 1.2N / mm, transmittance greater than 90%, refractive index of 1.52 to 1.58, and operating temperature of -55°C to 125°C.

[0016] Furthermore, the original screen of the selected LCD screen is 5 inches.

[0017] The technical effects of the present invention are:

[0018] The original screen formed by cutting the LCD screen has a much lower cost than the original screen made by directly opening the mold. The anti-reflective shielding glass and ITO heating glass on both sides of the LCD screen make the LCD glass stronger, the coating function effect better, and the overall weight of the product light; the surface heating glass has high reliability; the backlight adopts a double-sided light input design, the display brightness is uniform, and the life requirements can be met on the premise of meeting the brightness requirements. The selection of backlight materials and the fixing and limiting methods of each film material improve the ability of the backlight source to resist mechanical stress. Adding an anti-reflective coating on the shielding glass and selecting a high-brightness LED to improve the overall brightness of the reinforced LCD display module, so that the product can still be clearly visible in the sun. By controlling the heated glass, the display screen can increase the liquid crystal temperature in an environment of -45℃ or even lower, keep the liquid crystal flip state, and ensure normal display of the picture. By overlapping the conductive foam and metal structural parts, the overall environmental adaptability and electromagnetic protection capabilities of the reinforced LCD display module are improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 Schematic diagram of using cutting and packaging technology to process a square screen into a beveled corner screen.

[0020] Figure 2 The figure is a schematic diagram of the structure of an airborne bevel-cut corner reinforced liquid crystal display module.

[0021] Figure 3 for Figure 2 Enlarged schematic diagram at point A in the middle.

[0022] In the figure: 1. Metal front frame; 2. Conductive foam; 3. Anti-reflection shielding glass; 4. Optical grade bonding adhesive; 5. LCD display; 6. ITO heating glass; 7. Backlight; 8. Light guide plate; 9. 703 black silicone rubber. DETAILED DESCRIPTION

[0023] The present invention will be further described below in conjunction with the accompanying drawings and embodiments:

[0024] A conventional 5-inch LCD screen 5 is selected, and a pentagonal beveled LCD screen is formed through secondary processing such as cutting and packaging. First, determine the cutting line of the LCD screen, use a mold to vacuum adsorb and fix the LCD screen, find the pixel unit through fine-tuning, align the pixel light-transmitting median area, determine the cutting line of the LCD screen, and make the cutting position avoid the position of the liquid crystal crystal. Use an LCD screen laser cutting machine with an accuracy of not less than ±0.1mm to cut off the excess part along the cutting line, and control the cutting speed at (20-30)mm / s to form an original screen of suitable size; secondly, use curing glue to quickly seal the incision. According to the length of the incision, the time from cutting completion to sealing completion should not exceed 1s / mm to reduce the Liquid crystal contamination, after UV glue sealing is completed, glue seepage is carried out, and the seepage time is (30~40)s. After the seepage, the sealing glue is completely cured by UV irradiation lamp; finally, the formed beveled LCD screen is subjected to environmental stress screening and testing. The conditions of environmental stress screening comply with GJB1032A-2020, and the temperature conditions are -55℃~70℃. During the environmental stress screening process, the main assessment is whether the sealing glue on the cutting edge of the LCD screen has cracks or falls off, whether the liquid crystal molecules on the cutting edge display abnormalities due to contamination, and whether there is a problem of liquid crystal leakage or air bubbles.

[0025] After the qualified beveled LCD screen is tested, the front and back are bonded with anti-reflection shielding glass 3 and ITO heating glass 6 respectively by optical grade bonding glue 4. The optical grade bonding glue uses heat-curing silicone glue, and the curing time is controlled to be (60-70) hours. The main performance indicators after curing are: hardness is (30-40) HA, bonding strength is greater than 1.2N / mm, transmittance is greater than 90%, refractive index is 1.52-1.58, and working temperature is -55℃~125℃. The main performance indicators of anti-reflection shielding glass are: transmittance is not less than 85%, the sum of mirror reflection factor and diffuse reflection is not more than 1.3%, and the shielding resistance is (14±2)Ω / sq. ITO heating glass generally uses borosilicate glass, with an ITO layer on the surface, and the surface resistance is controlled at (25-30)Ω / sq.

[0026] A backlight assembly is arranged behind the ITO heated glass, mainly including a backlight 7 and a light guide plate 8. The backlight consists of a group of white lights and a group of colored lights (red, green, and orange). In day mode, white lights are used to increase display brightness, and in night mode, only colored lights are used to reduce radiance to meet night vision compatibility requirements. The light guide plate is made of optical grade polycarbonate, and concave spherical dots are engraved on its surface to achieve the effect of converting a point light source into a uniform surface light source.

[0027] The LCD screen module is bonded to the metal front frame 1 through the conductive foam 2. The conductive foam is composed of flame-retardant slow-rebound foam wrapped with conductive copper foil. The main performance indicators are: diameter 2mm, compression rate not less than 50%, and conductivity not greater than 0.07Ω / sq. Then 703 black silicone rubber 9 is used to fill the gap to avoid light leakage, enhance the overall sealing of the LCD display module, and improve environmental adaptability.

Claims

1. A chamfered corner reinforced liquid crystal display module for airborne use, characterized in that: The liquid crystal display module includes: a liquid crystal screen, anti-reflection shielding glass, ITO heating glass, optical grade bonding adhesive, and a backlight assembly; The anti-reflection shielding glass and ITO heating glass are bonded to the front and back of the LCD screen respectively by optical-grade bonding adhesive; A backlight assembly is disposed behind the ITO heated glass; The anti-reflective shielding glass is bonded to the metal front frame through conductive foam.

2. The liquid crystal display module according to claim 1, characterized in that: The LCD screen is a pentagonal structure formed by chamfering one corner of a rectangle.

3. The liquid crystal display module according to claim 2, characterized in that: The LCD screen beveling method is as follows: vacuum fix the LCD screen, find the pixel unit through fine adjustment, align with the middle light-transmitting area of ​​the pixel unit, determine the cutting line of the LCD screen, make the cutting position avoid the pixel unit crystal position, and use an LCD screen laser cutting machine with an accuracy of not less than ±0.1mm to cut off the excess part along the cutting line.

4. The liquid crystal display module according to claim 3, characterized in that: After the LCD screen is beveled, it is sealed in the following way: the cut is sealed with curing UV glue, and after the UV glue is sealed, the glue is infiltrated, and after the infiltration, the sealing glue is completely cured by UV irradiation lamp.

5. The liquid crystal display module according to claim 4, characterized in that: The time from cutting completion to sealing completion shall not exceed L seconds, where L is the incision length in mm.

6. The liquid crystal display module according to claim 4, characterized in that: The glue penetration time is 30s to 40s.

7. The liquid crystal display module according to claim 4, characterized in that: Optical-grade bonding adhesive is a heat-curing silicone adhesive with a controlled curing time of 60h to 70h. The performance indicators after curing are as follows: hardness of 30HA to 40HA, bonding strength greater than 1.2N / mm, transmittance greater than 90%, refractive index of 1.52 to 1.58, and operating temperature of -55℃ to 125℃.

8. The liquid crystal display module according to claim 1, characterized in that: The original screen of the selected LCD screen is 5 inches.

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