A high-brightness, wide-temperature COG liquid crystal display screen

Abstract

This utility model relates to the field of LCD screens, specifically disclosing a high-brightness, wide-temperature COG LCD display screen, including a mounting frame, a COG LCD screen, a PCB board, and a backlight assembly. The mounting frame is snapped into the PCB board, and the COG LCD screen is disposed within the mounting frame. A light guide plate is provided at the bottom of the COG LCD screen, and an optical film layer is provided between the light guide plate and the COG LCD screen. A COG driver chip is provided on the COG LCD screen and is fixed by hot pressing with ACF adhesive. The COG driver chip is electrically connected to the liquid crystal electrodes of the COG LCD screen, and the backlight assembly is electrically connected to the COG driver chip. This utility model reduces the length of flexible leads and lowers signal delay and interference by directly mounting the COG driver chip onto the COG LCD screen. The hot pressing fixation with ACF adhesive improves the packaging reliability, enhances the electrical connection stability between the driver circuit and the liquid crystal pixels, and results in a more compact overall structure that is easy to integrate. It features wide-temperature operation, high brightness, uniform backlight, improved visibility, low power consumption, extended device battery life, and high reliability.

Description

Technical Field

[0001] This utility model relates to the field of LCD screens, specifically a high-brightness, wide-temperature COG LCD screen. Background Technology

[0002] Existing LCD displays suffer from significantly reduced response speeds in low-temperature environments, leading to display delays and image retention. In high-temperature environments, the liquid crystal materials are prone to light leakage, blackening, and other failures. Furthermore, backlight brightness is generally insufficient and uniform, resulting in poor visibility in bright light or outdoor environments. Traditional structures are also complex, space-consuming, and difficult to achieve in thin and lightweight designs, while consuming relatively high power, making them unsuitable for portable or battery-powered devices. Therefore, there is an urgent need for an LCD display solution that combines high brightness, wide operating temperature range, compact structure, and low power consumption. Utility Model Content

[0003] To address the existing problems, this utility model provides a high-brightness, wide-temperature COG liquid crystal display screen, which can effectively solve the problems mentioned in the background art.

[0004] To solve the above problems, the present invention adopts the following technical solution:

[0005] A high-brightness, wide-temperature COG liquid crystal display includes a mounting frame, a COG liquid crystal screen, a PCB board, and a backlight assembly. The mounting frame is snapped into the PCB board, the COG liquid crystal screen is disposed within the mounting frame, a light guide plate is provided at the bottom of the COG liquid crystal screen, an optical film layer is provided between the light guide plate and the COG liquid crystal screen, a COG driving chip is provided on the COG liquid crystal screen and is fixed by hot pressing with ACF adhesive, the COG driving chip is electrically connected to the liquid crystal electrodes of the COG liquid crystal screen, and the backlight assembly is mounted on the mounting frame and electrically connected to the COG driving chip.

[0006] As a further improvement of this utility model, the COG LCD screen adopts a VA type LCD screen.

[0007] As a further embodiment of this utility model: the COG LCD screen includes an upper polarizer, a liquid crystal display glass and a lower polarizer arranged sequentially from top to bottom. The upper polarizer and the lower polarizer are both attached to the surface of the liquid crystal display glass using a reverse bonding process. The COG driving chip is located in the non-display area of ​​the liquid crystal display glass.

[0008] As a further embodiment of this utility model: the backlight assembly includes a backlight mounting plate, which is electrically connected to the PCB board through the mounting frame. A plurality of LED lamp beads arrays are welded on the backlight mounting plate, and the LED lamp beads are located on the light-incident side of the light guide plate.

[0009] As a further embodiment of this utility model: the side wall of the liquid crystal display glass is provided with conductive pins, the conductive pins are electrically contacted with the pads on the COG driver chip, and the conductive pins are plugged into the connector on the PCB board.

[0010] As a further improvement of this utility model, the side of the mounting frame is provided with a slot that matches the conductive pin.

[0011] As a further improvement of this utility model: the mounting frame is provided with buckles at the four bottom corners, and the PCB board is provided with slots that match the buckles.

[0012] As a further improvement of this utility model, the bottom surface of the light guide plate is provided with a reflective sheet.

[0013] As a further improvement of this utility model: the light guide plate is made of PC material, and the surface of the light guide plate is provided with a light guide pattern formed by microstructure etching.

[0014] As a further improvement of this utility model: the PCB board is provided with switch buttons on both sides, and foam blocks are provided on the sides of the switch buttons, the height of the foam blocks being greater than the height of the switch buttons.

[0015] Compared with the prior art, the beneficial effects of this utility model are as follows: By directly mounting the COG driver chip onto the COG LCD screen, this utility model reduces the length of flexible leads, lowers signal delay and interference, and improves packaging reliability through ACF glue hot pressing fixation. This enhances the electrical connection stability between the driver circuit and the LCD pixels, resulting in a more compact overall structure that is easy to integrate. It operates over a wide temperature range, adapts to harsh environments, provides high brightness and uniform backlighting for improved visibility, has low power consumption to extend device battery life, and helps improve the overall machine's vibration resistance and environmental adaptability. It is highly reliable and suitable for industrial, automotive, and outdoor equipment. Attached Figure Description

[0016] Figure 1 A three-dimensional schematic diagram of the overall structure of a high-brightness, wide-temperature COG liquid crystal display screen;

[0017] Figure 2 This is a schematic plan view of the overall structure of a high-brightness, wide-temperature COG liquid crystal display screen;

[0018] Figure 3 for Figure 2 Schematic diagram of the AA section;

[0019] Figure 4 An exploded view of the overall structure of a high-brightness, wide-temperature COG liquid crystal display screen;

[0020] Figure 5This is a schematic diagram of the backlight assembly structure in a high-brightness, wide-temperature COG liquid crystal display screen.

[0021] In the diagram: 1. Mounting frame; 2. COG LCD screen; 21. Upper polarizer; 22. LCD display glass; 23. Lower polarizer; 24. Conductive pin; 3. Backlight assembly; 31. Backlight mounting plate; 32. LED beads; 33. Connector; 4. PCB board; 5. Clip; 6. Slot; 7. Switch button; 8. Foam block; 9. Light guide plate; 10. Optical film layer; 11. Reflector; 12. COG driver chip; 13. Slot. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0023] Combination Figures 1 to 5This embodiment provides a high-brightness, wide-temperature COG LCD display screen, which includes a mounting frame 1, a COG LCD screen 2, a backlight assembly 3, and a PCB board 4. The PCB board measures 107.0mm × 41.0mm × 1.6mm. The COG LCD screen 2 is a VA-type LCD screen, which is embedded in the mounting frame 1. The mounting frame 1 is a slot that engages with the PCB board 4. Specifically, the mounting frame 1 has four buckles 5 at its bottom corners, and the PCB board 4 has slots 6 that match the buckles 5. The clip 5 is pressed and fastened into the corresponding slot 6 on the PCB board 4, thereby securing the mounting frame 1 to the PCB board 4. Switch buttons 7 are located on both sides of the PCB board 4, and foam blocks 8 are located on the sides of the switch buttons 7. The height of the foam blocks 8 is greater than the height of the switch buttons 7, and the foam blocks 8 are used to protect the switch buttons 7. A light guide plate 9 is located at the bottom of the COG LCD screen 2, and an optical film layer 10 is located between the light guide plate 9 and the COG LCD screen 2. The optical film layer 10 includes a brightness enhancement film and / or a diffusion film. The brightness enhancement film refracts oblique light into forward light through a microprism structure, significantly improving the screen's viewing angle. To improve brightness and reduce backlight power consumption, a diffuser film is located above the brightness enhancement film. This diffuser film disperses light hotspots, resulting in more uniform screen brightness distribution, reducing bright spots or dark areas, and improving display uniformity. A reflective sheet 11 is located on the bottom surface of the light guide plate 9 to improve upward light emission efficiency. The light guide plate 9 is made of PC material and measures 68.8mm × 30.0mm × 1.5mm. The surface of the light guide plate 9 features a light-guiding pattern formed by microstructure etching, enhancing light utilization. The COG LCD screen 2 is equipped with a COG driver chip 12, which is fixed by hot pressing with ACF adhesive. The COG driver chip 12 is model U. C1671C, ACF adhesive can alleviate thermal stress caused by temperature changes, prevent solder joint cracking or detachment, and improve structural reliability under high and low temperature cycling. COG driver chip 12 is electrically connected to the liquid crystal electrode of COG LCD screen 2. Backlight assembly 3 is installed in the mounting frame 1 and located on the side of light guide plate 9. Backlight assembly 3 is electrically connected to PCB board 4. The entire LCD screen can work stably in an environment of -20℃ to 70℃, supports wide temperature drive, has fast response speed, drive voltage of 3.3V, and the overall structural thickness is no more than 4.6mm, making it suitable for embedded devices.

[0024] Specifically, the COG LCD screen 2 includes an upper polarizer 21, a liquid crystal display glass 22, and a lower polarizer 23 arranged sequentially from top to bottom. The upper polarizer 21 and the lower polarizer 23 are both attached to the surface of the liquid crystal display glass 22 using a reverse bonding process. Both the upper polarizer 21 and the lower polarizer 23 are transmissive and the bonding angle is -45°. The COG driver chip 12 is located in the non-display area of ​​the liquid crystal display glass 22.

[0025] Specifically, the backlight assembly 3 includes a backlight mounting plate 31, on which multiple LED beads 32 arrays are soldered. The backlight mounting plate 31 is provided with a connector 33, which passes through the mounting frame 1 and is electrically connected to the PCB board 4. The operating current of the LED is 20mA×5, and the operating voltage is 3.0V. The LED beads 32 are located on the light-incident side of the light guide plate 9 and enter the light guide plate 9 in a side-incident manner. Specifically, the LED bead 32 array is located on the long side of the light guide plate 9 to improve the light entry effect.

[0026] The sidewall of the liquid crystal display glass 22 is provided with conductive pins 24. The conductive pins 24 make electrical contact with the pads on the COG driver chip 12 and are plugged into the connector on the PCB board 4. The side of the mounting frame 1 is provided with a slot 13 that matches the conductive pins 24. After the COG liquid crystal screen 2 is assembled with the mounting frame 1, the conductive pins 24 extend from the slot 13 and are electrically plugged into the PCB board 4. The conductive pins 24 can limit the installation of the COG liquid crystal screen 2 and realize the electrical connection between the COG liquid crystal screen 2 and the PCB board 4. After the overall structure is packaged, the driving voltage of the conductive pins 24 is 3.3V. The display effect and power consumption are tested.

[0027] The working principle of this utility model is as follows: by directly mounting the COG driver chip 12 onto the COG LCD screen 2, the length of the flexible lead wire is reduced, signal delay and interference are reduced, and the hot pressing of ACF glue improves the packaging reliability, enhances the electrical connection stability between the driver circuit and the LCD pixel, makes the overall structure more compact and easier to integrate, allows for wide temperature operation and adaptability to harsh environments, provides high brightness and uniform backlight to improve visibility, has low power consumption to extend the device's battery life, helps improve the overall machine's vibration resistance and environmental adaptability, has high reliability, and is suitable for industrial, automotive, and outdoor equipment.

[0028] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0029] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A high-brightness, wide-temperature COG liquid crystal display screen, characterized in that, The device includes a mounting frame, a COG LCD screen, a PCB board, and a backlight assembly. The mounting frame is snapped into the PCB board. The COG LCD screen is disposed within the mounting frame. A light guide plate is provided at the bottom of the COG LCD screen. An optical film layer is provided between the light guide plate and the COG LCD screen. A COG driver chip is provided on the COG LCD screen and is fixed by hot pressing with ACF adhesive. The COG driver chip is electrically connected to the liquid crystal electrodes of the COG LCD screen. The backlight assembly is mounted on the mounting frame and is electrically connected to the COG driver chip.

2. The high-brightness, wide-temperature COG liquid crystal display screen according to claim 1, characterized in that, The COG LCD screen includes an upper polarizer, a liquid crystal display glass, and a lower polarizer arranged sequentially from top to bottom. Both the upper polarizer and the lower polarizer are attached to the surface of the liquid crystal display glass using a reverse bonding process. The COG driving chip is located in the non-display area of ​​the liquid crystal display glass.

3. A high-brightness, wide-temperature COG liquid crystal display screen according to claim 2, characterized in that, The sidewall of the liquid crystal display glass is provided with conductive pins, which are electrically contacted with the pads on the COG driver chip and are plugged into the connector on the PCB board.

4. A high-brightness, wide-temperature COG liquid crystal display screen according to claim 3, characterized in that, The mounting frame has slots on its sides that match the conductive pins.

5. A high-brightness, wide-temperature COG liquid crystal display screen according to claim 1, characterized in that, The backlight assembly includes a backlight mounting plate, which is electrically connected to the PCB board through the mounting frame. Multiple LED lamp beads arrays are soldered on the backlight mounting plate, and the LED lamp beads are located on the light-incident side of the light guide plate.

6. A high-brightness, wide-temperature COG liquid crystal display screen according to claim 1, characterized in that, The mounting frame has buckles at the four bottom corners, and the PCB board has slots that match the buckles.

7. A high-brightness, wide-temperature COG liquid crystal display screen according to claim 1, characterized in that, The bottom surface of the light guide plate is provided with a reflective sheet.

8. A high-brightness, wide-temperature COG liquid crystal display screen according to claim 1, characterized in that, The light guide plate is made of PC material, and the surface of the light guide plate has a light guide pattern formed by microstructure etching.

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