Mobile phone and narrow-screen frameless liquid crystal display screen thereof

Abstract

The invention relates to the technical field of liquid crystal display screens, in particular to a mobile phone and a narrow-screen frameless liquid crystal display screen thereof. Comprising a frame body and a display panel, the display panel is arranged above the frame body, and the display panel comprises a visual panel and a peripheral frame; a U-shaped circulation groove is formed in the lower surface of the peripheral frame in the circumferential direction, and openings in the two ends of the circulation groove are a flow inlet and a flow outlet respectively. Fixing plates are fixedly mounted at the opening of the outflow port in a staggered manner, and a flow guide gap is formed between every two adjacent fixing plates; a glue groove is formed in the edge of the frame body corresponding to the flow-in opening; an anti-overflow mechanism is arranged on the edge of the frame body opposite to the flow guide gap and is used for carrying and guiding the shading glue for the second time; the glue groove is communicated with the flow inlet to form an overflowing glue flow guide channel, the shading glue is prevented from flowing to the backlight system, the shading glue overflowing during installation is accurately guided to the anti-overflowing mechanism through cooperative flow guide of the glue groove and the U-shaped circulation groove, the path of the shading glue making contact with the backlight system is fundamentally blocked, and the black shadow defect of the edge of the visual panel is eliminated.

Description

Technical Field

[0001] The present invention relates to the technical field of liquid crystal display screens, and in particular to a mobile phone and a narrow-screen, borderless liquid crystal display screen thereof. Background Art

[0002] With the development of intelligent mobile phones and users' pursuit of mobile phone appearance, this requires that the mobile phone backlight should be designed from the source to ensure that the distance from the left and right edges of the LCD (liquid crystal display panel) to the left and right edges of the LCM (liquid crystal display) approaches zero. This makes the mobile phone screen-to-body ratio larger and more visually impactful, meeting market demand.

[0003] The liquid crystal display screen of the existing technology mainly includes an iron frame, a plastic frame, a liquid crystal display panel, a reflective sheet, a light guide plate, a diffuser, a prism sheet, a light-shielding glue, a lamp and an FPC circuit; the liquid crystal display panel, the reflective sheet, the light guide plate, the diffuser, the prism sheet and the lamp are all arranged in a concave cavity formed by the iron frame and the plastic frame. The thicker the plastic frame and the iron frame are, the more guaranteed the structural performance, mechanical strength and antistatic performance of the mobile phone liquid crystal display screen are. However, the requirements of narrow frame and high screen ratio cannot be met. For this reason, a mobile phone and its narrow screen frameless liquid crystal display screen are provided in Chinese patent publication No.: CN105044979A. The invention relates to a liquid crystal display screen, which is realized by arranging a liquid crystal display panel above a frame and covering the concave cavity of the frame, wherein the width of the liquid crystal display panel is greater than the width of the concave cavity, and a light-shielding adhesive is arranged between the liquid crystal display panel and the frame, thereby replacing the traditional practice of arranging the liquid crystal display panel in the concave cavity of the frame. In this way, while ensuring the strength of the liquid crystal display screen, the screen-to-body ratio of the liquid crystal display screen is improved, the black border area is reduced, the user experience is enhanced, and the reliability of the backlight system is improved. Moreover, since the thickness of the frame is reduced, the amount of raw materials used can be reduced, materials can be saved, and production costs can be reduced.

[0004] In the above-mentioned prior art, the edge of the frame and the frame of the LCD screen are fixed by light-shielding glue. The solution mentions that the light-shielding glue can use black light-shielding glue or black and white light-shielding glue, but in the display production and installation scenario, its essence is to apply the light-shielding glue to the upper edge of the frame. When the staff or machine fits the LCD screen together, the mutual squeezing of the edges of the two will cause the volume of the light-shielding glue to expand or overflow, causing the light-shielding glue to overflow into the concave cavity of the frame, easily causing it to contact the backlight system, thereby resulting in obstruction of the backlight system, causing abnormal light transmission, and causing black shadows to appear when the LCD screen displays images, resulting in a poor viewing experience for users. Summary of the Invention

[0005] The present invention provides a narrow-screen, borderless liquid crystal display screen. A glue groove is provided on the edge of a frame body to cooperate with a circulation groove below a display panel. When light-shielding glue overflows, the overflowed light-shielding glue flows in through an inlet and out through an outlet to squeeze a receiving platform. The excess glue squeezes the receiving platform and then flows into a glue storage cavity below a fixed plate on the upper surface of the frame body, thereby solving the problems raised in the above-mentioned background technology, namely:

[0006] The overflow of the light-shielding glue can easily flow into the concave cavity of the frame, blocking the backlight system, resulting in a black shadow on the visual panel, affecting the user's viewing experience.

[0007] To achieve the above-mentioned purpose, the liquid crystal display screen includes a frame and a display panel covering the frame, wherein the display panel has a visible panel and a peripheral frame; a U-shaped circulation groove is provided along the circumference of the lower surface of the peripheral frame, and the two ends of the circulation groove are respectively an inlet and an outlet;

[0008] The outlet is provided with staggered fixed plates, with flow guide gaps formed between adjacent fixed plates;

[0009] A glue groove is provided at a position on the edge of the frame corresponding to the inlet;

[0010] An anti-overflow mechanism is provided at the edge of the frame facing the guide gap;

[0011] The glue groove is connected to the inlet to form an overflow glue diversion channel, and the overflowed light-shielding glue flows to the overflow prevention mechanism through the inlet, the circulation groove, and the outlet in sequence;

[0012] The edge of the frame is provided with a glue storage cavity, and the upper opening of the glue storage cavity is staggeredly installed with a plurality of horizontal plates;

[0013] The anti-overflow mechanism guides the light-shielding glue into the glue storage cavity below the horizontal plate at the edge of the frame, and blocks the light-shielding glue from flowing to the backlight system provided at the center of the frame.

[0014] When the frame and the display panel are fitted and installed, the light-shielding glue is applied along the glue groove at the edge of the frame. During the installation of the display panel, the light-shielding glue is continuously squeezed, and the squeezed glue flows along the inlet of the circulation groove and then flows out from the outlet. The excess glue squeezes the receiving platform of the anti-overflow mechanism, causing it to sink, and the overflowed glue flows into the glue storage cavity below the horizontal plate at the edge of the frame for storage.

[0015] In the above technical solution, the inlet of the circulation trough gradually expands inwardly, which can store more overflowed colloid. In addition, the gaps between the circulation trough at the outlet are connected by staggered fixed plates. At the same time, the fixed plates correspond one-to-one with the horizontal plates on the edge of the frame, so that there is no additional gap between the outlet and the anti-overflow mechanism. The colloid is accurately squeezed against the receiving platform of the anti-overflow mechanism, so that the colloid flows along the inclined surface of the sliding table into the glue storage cavity below the horizontal plate for storage.

[0016] On this basis, the anti-overflow mechanism includes a receiving platform and an isolation box embedded in the inside of the frame. The receiving platform is flush with the upper surface of the fixed plate under normal circumstances, and there is a gap between the two sides of the receiving platform and the adjacent horizontal plates. The cross-section of the receiving platform is an inverted trapezoid, and two inclined side surfaces are opened under the receiving platform. When installing the display panel, the light-shielding glue near the receiving platform will preferentially flow into the glue storage cavity along the gaps on both sides of the receiving platform.

[0017] In another technical solution, the lower surface of the receiving platform is elastically connected to the bottom surface of the isolation box through an elastic member, so that the receiving platform can be vertically displaced. A sliding platform is provided under the receiving platform, and the sliding platform is slidably connected to the slide groove opened above the isolation box through a slider at the bottom, and a limiting member is fixedly installed at the center position of the slide groove; when the receiving platform is squeezed downward by the light-shielding glue, the elastic member contracts downward under the squeezing force to accumulate elastic potential energy, and the vertical displacement of the receiving platform causes the inclined surfaces on both sides to squeeze the inclined surfaces of the sliding platform, causing a biased squeezing force to cause the sliding platform to displace laterally. At this time, the downward displacement of the receiving platform causes a depression, which cooperates with the colloid flow inclined surface formed by the lateral movement of the sliding platform, thereby expanding the glue overflow channel.

[0018] Furthermore, a cavity is provided in the center of the frame, and a reflective sheet, a light guide plate, a diffuser, a lower brightness enhancement sheet and an upper brightness enhancement sheet stacked in sequence from bottom to top in the cavity constitute a backlight system to provide sufficient light source for the display panel.

[0019] In this technical solution, a sealing ring is provided in the gap between the backlight system and the frame cavity. The provision of the sealing ring reduces colloid overflow while ensuring a stable installation of the internal backlight system, making the overall structure of the mobile phone more compact.

[0020] The present invention also provides a mobile phone comprising the narrow-screen borderless liquid crystal display, which achieves a high screen-to-body ratio while preventing the light-shielding glue from overflowing onto the surface of the backlight system.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] Through the coordinated guidance of the glue groove and the U-shaped circular flow groove, the light-shielding glue overflowing during installation is precisely guided to the anti-overflow mechanism; the vertical displacement of the receiving platform in the anti-overflow mechanism is converted into horizontal displacement of the sliding platform through the inclined linkage, dynamically expanding the overflow glue channel, so that the excess glue can efficiently flow into the glue storage cavity under the horizontal plate of the frame for storage; combined with the physical isolation of the outer sealing ring of the backlight system, the path of the light-shielding glue contacting the backlight system is fundamentally blocked, eliminating the black shadow defect on the edge of the visible panel. At the same time, this structure does not require increasing the width of the outer frame or sacrificing mechanical strength, so that the mobile phone can achieve an extremely narrow frame visual effect while ensuring display quality and reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0024] Figure 2 It is a schematic diagram of the local structure of the present invention;

[0025] Figure 3 It is a schematic diagram of the cutaway structure of the present invention;

[0026] Figure 4 For the present invention Figure 3 Enlarged view of point A in the middle;

[0027] Figure 5 is a schematic diagram of a partial structure of a display panel of the present invention;

[0028] Figure 6 For the present invention Figure 5 Enlarged view of point B in the middle;

[0029] Figure 7 This is a schematic diagram of the internal structure of the frame of the present invention;

[0030] Figure 8 For the present invention Figure 7 Enlarged view of point C in the middle;

[0031] Figure 9 It is a partial structural diagram of the overflow prevention mechanism of the present invention.

[0032] The meaning of each mark in the figure is:

[0033] 100, frame; 101, adhesive groove; 102, reflector; 103, light guide plate; 104, diffuser; 105, lower brightness enhancement sheet; 106, upper brightness enhancement sheet; 107, sealing ring;

[0034] 200, display panel; 201, visual panel; 202, inlet; 203, outlet; 204, fixing plate; 205, anti-overflow mechanism; 2051, receiving platform; 2052, elastic member; 2053, sliding platform; 2054, limiting member; 2055, isolation box; 206, light-shielding adhesive layer. DETAILED DESCRIPTION

[0035] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0036] At present, in the prior art, the light-shielding glue overflows and easily flows into the concave cavity of the frame 100, blocking the backlight system, thereby causing a black shadow to appear on the visual panel 201, affecting the user's viewing experience. The present invention provides a narrow-screen borderless LCD display, see Figures 1-4 As shown, it includes a frame 100 and a display panel 200. The display panel 200 is arranged above the frame 100. The display panel 200 includes a visual panel 201 and a peripheral frame. A U-shaped circulation groove is provided on the lower surface of the peripheral frame along the circumferential direction. The openings at both ends of the circulation groove are an inlet 202 and an outlet 203 respectively.

[0037] The annular groove expands inwardly along the inlet 202 to form a colloid-containing cavity with a relatively large inner cavity;

[0038] Figure 5-Figure 6 In the middle, fixed plates 204 are staggered and fixedly installed at the opening of the outflow port 203, and a guide gap is formed between adjacent fixed plates 204. The long side of the guide gap is 0.1-0.15mm longer than that of the fixed plate 204, and the guide gap is consistent with the length of the receiving platform 2051 of the overflow prevention mechanism 205 in the side groove of the frame 100;

[0039] A glue groove 101 is provided at the edge of the frame 100 corresponding to the inlet 202;

[0040] The glue groove 101 is connected to the inlet 202 to form an overflow glue diversion channel, blocking the light-shielding glue from flowing to the backlight system;

[0041] A light shielding adhesive layer 206 is provided between the outer frame of the display panel 200 and the edge of the frame body 100 for fixing.

[0042] During installation, when the display panel 200 and the frame 100 are pressed and installed through the light-shielding glue layer 206, the light-shielding glue is applied along the glue groove 101 on the edge of the frame 100. The glue groove 101 is connected to the inlet 202 of the U-shaped annular flow groove on the lower surface of the outer frame of the display panel 200. The overflowing glue is first captured by the inlet 202 of the annular flow groove to form a primary diversion channel, forcing the overflowing glue to flow along the annular flow groove to the outflow outlet 203; the staggered fixing plates 204 at the outflow outlet 203 control the flow rate of the glue through the adjacent diversion gaps, and accurately guide the glue to the anti-overflow mechanism 205; the anti-overflow mechanism 205 acts as a secondary control barrier, receiving the glue through the receiving platform 2051 and guiding it to flow along the gaps on both sides into the glue storage cavity below the horizontal plate at the edge of the frame 100. The glue storage cavity is not shown in the figure, thereby completely blocking the path of the light-shielding glue to flow to the central area of ​​the concave cavity where the backlight system is located.

[0043] See also Figure 7-Figure 9 As shown, the anti-overflow mechanism 205 includes a receiving platform 2051 and an isolation box 2055 embedded in the frame 100. The receiving platform 2051 is flush with the upper surface of the fixed plate 204 under normal conditions, and there is a gap between the two sides of the receiving platform 2051 and the adjacent horizontal plates. After applying the light-shielding glue, when pressing and installing, the part of the light-shielding glue close to the gap will flow down from the reserved gap first.

[0044] Figure 9 In the embodiment, the receiving platform 2051 is elastically connected to the inner bottom surface of the isolation box 2055 through the elastic member 2052 (when the glue pressure is ≥10kPa, the elastic member 2052 is pressed downward to drive the receiving platform 2051 to contract; when the glue pressure is ≤6kPa, the elastic member 2052 drives the receiving platform 2051 to reset), and the isolation box 2055 is located inside the edge of the frame 100. The elastic connection between the isolation box 2055 and the elastic member 2052 allows the receiving platform 2051 to move vertically. The two sides of the upper surface of the isolation box 2055 are slidably connected to the sliding platform 2053 through sliders and the slide groove. A limit member 2054 is provided in the center of the slide groove for limiting the movement range of the sliding platform 2053. The cross-section of the receiving platform 2051 is an inverted trapezoid, and its inclined surface contacts the inclined surface of the sliding platform 2053. When the receiving platform 2051 is squeezed downward by the light-shielding glue, the vertical displacement is converted into horizontal displacement of the sliding platform 2053 through the cooperation of the inclined surface, thereby expanding the glue overflow channel;

[0045] When the light-shielding glue flows from the outflow port 203 through the guide gap of the fixed plate 204 to the anti-overflow mechanism 205, the colloid accumulation presses the receiving platform 2051 downward; the receiving platform 2051 realizes vertical displacement through the elastic contraction of the elastic member 2052, and at the same time, the inclined surface of its inverted trapezoidal cross-section and the inclined surface of the sliding platform 2053 produce a wedge-shaped extrusion effect, which decomposes the vertical downward mechanical force into a horizontal component force, driving the sliding platform 2053 to slide horizontally outward along the slide groove on the isolation box 2055; the horizontal displacement of the sliding platform 2053 is limited by the limit member 2054 in the center of the slide groove, ensuring that the displacement is within the design threshold.

[0046] Also, see Figure 4 As shown, a concave cavity is provided in the center of the frame 100, and a reflective sheet 102, a light guide plate 103, a diffuser 104, a lower brightness enhancement sheet 105 and an upper brightness enhancement sheet 106 are arranged in sequence from bottom to top in the concave cavity to form a backlight system, and a sealing ring 107 is installed between the backlight system and the concave cavity of the frame 100. The sealing ring 107 blocks the colloid from longitudinally penetrating into the backlight system, and forms a double horizontal and vertical isolation with the anti-overflow mechanism 205.

[0047] Example 1: Installation of the overflow prevention mechanism 205 and the overall structure

[0048] First, a U-shaped annular groove with a depth of 0.20±0.01mm is precisely machined on the outer frame of the display panel 200 through a chemical etching process, and a 2μm thick release agent is sprayed into the glue groove 101 of the frame 100. In this embodiment, the release agent can be a UV-curable silicone resin or solvent-based silicone oil in the prior art. Then, the isolation box 2055 is pressed into a predetermined position on the side wall of the frame 100, and an elastic member 2052 with a pre-compression stroke of 10% is installed. In this embodiment, the elastic member 2052 can be a silicone spring. The inverted trapezoidal receiving platform 2051 is fixed by laser welding so that its initial height is flush with the cross plate. Then, high-temperature grease is applied to the side wall of the slider, and the sliding platform 2053 is assembled into the sliding groove.

[0049] Finally, the robot arm is used to 2 The display panel 200 is pressed together with the frame 100 by pressure, and the pressure is maintained for 10 seconds to solidify the light-shielding adhesive layer 206. At this time, the overflowing adhesive is guided by the annular flow groove and enters the channel through the inlet 202. When the adhesive pressure exceeds 10kPa, the receiving platform 2051 is pushed downward, and the sliding platform 2053 is driven by the inclined surface to move horizontally to widen the guide gap. The excess adhesive is dynamically introduced into the adhesive storage cavity under the horizontal plate.

[0050] Example 2: Verification of diversion response

[0051] After the anti-overflow mechanism 205 is installed according to the installation method of Example 1, a pressure test may be performed. The test method is as follows:

[0052] 1. Inject black and white shading glue or black and black shading glue with a viscosity of 8000 cP into the glue tank 101 at 0.8 N / mm 2 Pressure simulates overpressure conditions;

[0053] 2. Use a high-speed camera to record the test process, where the high-speed camera uses a device with a shooting speed greater than 1000fps for recording;

[0054] 3. The overflowed colloid is introduced into the colloid storage cavity, and the surface of the backlight system is not polluted.

[0055] The high-speed camera test record in Example 2 shows that when the robot arm is used at 0.8N / mm 2 In the simulation experiment of overpressure conditions, the light-shielding colloid filled the glue groove 101 within 3.2 seconds and flowed into the circulation groove along the inlet 202. When the glue pressure at the outlet 203 reached 10.5kPa, the receiving platform 2051 moved down 0.32mm and made the sliding platforms 2053 on both sides move laterally by 0.16mm. The overall guide gap was expanded, and the colloid overflowed due to squeezing was completely introduced into and stored in the glue storage cavity under the horizontal plate of the frame 100. After the outflow part of the colloid was stored, when the glue pressure dropped to 6.5kPa, the receiving platform 2051 was rebounded by the elastic potential energy of the elastic member 2052 and returned to a position flush with the horizontal plate. The gap between its two sides and the horizontal plate was filled with light-shielding colloid.

[0056] Comparative Example 1: A frame 100 without an anti-overflow mechanism 205 in a traditional structure and a display panel 200 without a circulation groove are pressed together for installation. The pressing process parameters are the same as those in Example 1.

[0057] Comparative Example 2: The difference from Example 1 is that only a circulation trough is used to store overflowed colloid, there is no overflow prevention mechanism 205, and the pressing process parameters are the same as Example 1.

[0058] Experimental Example 1: Comparative test of black shadow defect rate (30 laminating devices of Example 1, Comparative Example 1 and Comparative Example 2 were used for testing, and the laminating conditions were selected as a group of 10 devices, using standard laminating, mechanical arm 0.5N / mm 2 Pressure and overpressure conditions, robotic arm 0.8N / mm 2 pressure, and high temperature and high humidity environment, temperature 85°C, humidity 85% RH)

[0059] This experimental example provides a method for testing the black shadow defect rate:

[0060] 1. Test equipment includes: OLED low-light camera (model specification: Hamamatsu C13440-20CU) for identifying 0.01mm 2High-resolution shadows; a standard light box (model GTAT-500A) that provides 2000 lux standard D65 light for the testing process; an environmental simulation chamber (model ESPEC SH-661) for controlling temperature and humidity during the testing process; and Image-Pro Premier 9.3 analysis software for automatic defect recognition and analysis.

[0061] 2. Testing process:

[0062] S1. Place a standard white board (reflectivity 98%) at the test position, use a low-light camera to capture a reference image with a 50 ms exposure, set the software to a brightness threshold of 230, and use the standard white board as a defect-free standard.

[0063] S2. Power on the sample and display a full white screen. Use an OLED low-light camera to shoot at a vertical distance of 10 cm from the screen. Scan the 2 mm ring zone at the edge of the visual panel 201 in sequence. Select three 10 mm*2 mm areas on the upper, lower, left and right edges of each sample.

[0064] S3. Statistics of sample defect rate and screen defect area during the experiment (judgment standard is >0.01mm 2 ).

[0065] Table 1 Black shadow defect rate test results

[0066]

[0067] Conclusion: According to the experimental results in Table 1, the edges of Example 1 of the present invention are free of defects under standard pressing conditions (defect area 0.00mm 2 ), under overpressure conditions, only 0.005mm appears on the right edge 2 Minor defects (less than the judgment threshold of 0.01mm 2 ), while the comparative example 1 of the conventional structure showed significant defects (0.24mm on the upper edge) during standard pressing. 2 , left edge 0.18mm 2 ), the defect area further expanded to 0.32mm under overpressure conditions 2 (lower edge), it still maintains 0.13-0.28mm under high temperature and high humidity conditions 2 Defects; Although there are no defects in the comparative example 2 during standard pressing, there are multiple defects in the overpressure condition (0.12mm on the left edge 2 ), even in high temperature and high humidity environment, it will produce 0.02-0.03mm 2 defects, indicating that the present invention can effectively control the defect area (≤0.008mm) under various working conditions through the synergistic effect of the circulation groove and the overflow prevention mechanism 205. 2 ), which can effectively reduce the defect area while improving the product yield.

[0068] In addition, the present invention also provides a mobile phone, including the narrow-screen borderless liquid crystal display, which achieves a high screen-to-body ratio while preventing the light-shielding glue from overflowing onto the surface of the backlight system.

[0069] Working Principle: During the press-fitting and installation process of the display panel 200 and the frame 100, the colloid that overflows from the light-shielding adhesive layer 206 is first captured by the inlet 202 of the circulation groove. The colloid then flows through the inlet 202 into the U-shaped circulation groove of the outer frame of the display panel 200 for directional guidance. After flowing along the circulation groove to the outlet 203, the colloid is controlled by the guide gap formed by the staggered fixing plates 204 and accurately guided to the overflow prevention mechanism 205.

[0070] When the glue pressure exceeds 10 kPa, the receiving platform 2051 is pressed downward, driving the sliding platform 2053 horizontally via the inverted trapezoidal slope to expand the guide gap while simultaneously storing energy in the elastic member 2052. The excess glue flows along the expanded channel and the gaps on both sides of the receiving platform 2051 into the glue storage cavity below the edge of the frame 100. When the glue pressure reaches 6 kPa or less, the elastic member 2052 returns to close the channel. Combined with the longitudinal isolation of the backlight system's peripheral sealing ring 107, this completely blocks the path of the light-shielding glue from contacting the backlight system, eliminating the edge shadow defect.

[0071] The above shows and describes the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are merely preferred examples of the present invention and are not intended to limit the present invention. Various changes and improvements may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and improvements fall within the scope of the present invention. The scope of protection claimed in the present invention is defined by the appended claims and their equivalents.

Claims

1. A narrow-screen borderless liquid crystal display screen, comprising a frame (100) and a display panel (200) covering the frame (100), wherein the display panel (200) has a visible panel (201) and a peripheral frame; characterized in that: A U-shaped annular flow groove is provided on the lower surface of the outer frame along its circumference, with an inlet (202) and an outlet (203) at both ends of the annular flow groove respectively. The outlet (203) is provided with staggered fixed plates (204), and a flow guide gap is formed between adjacent fixed plates (204); A glue groove (101) is provided at a position on the edge of the frame (100) corresponding to the inlet (202); An anti-overflow mechanism (205) is provided at a position on the edge of the frame (100) facing the guide gap; The glue groove (101) is connected to the inlet (202) to form an overflow glue diversion channel, and the overflowed light-shielding glue flows to the overflow prevention mechanism (205) through the inlet (202), the circulation groove, and the outlet (203) in sequence; The edge of the frame (100) is provided with a glue storage cavity, and a plurality of horizontal plates are staggeredly installed on the opening above the glue storage cavity; The anti-overflow mechanism (205) guides the light-shielding glue into the glue storage cavity below the edge transverse plate of the frame (100), thereby blocking the light-shielding glue from flowing toward the backlight system provided in the center of the frame (100).

2. The narrow-screen borderless liquid crystal display according to claim 1, characterized in that: The overflow prevention mechanism (205) comprises a receiving platform (2051) and an isolation box (2055) embedded in the frame (100); the receiving platform (2051) is flush with the upper surface of the fixed plate (204) under normal conditions, and gaps are left between the two sides of the receiving platform (2051) and the adjacent transverse plates; the cross-section of the receiving platform (2051) is an inverted trapezoid, and two inclined side surfaces are opened below the receiving platform (2051).

3. The narrow-screen borderless liquid crystal display according to claim 2, characterized in that: The lower surface of the receiving platform (2051) is elastically connected to the inner bottom surface of the isolation box (2055) via an elastic member (2052), so that the receiving platform (2051) can be vertically displaced.

4. The narrow-screen borderless liquid crystal display according to claim 2, characterized in that: A sliding platform (2053) is provided below the receiving platform (2051). The sliding platform (2053) is slidably connected to a slide groove provided above the isolation box (2055) via a slider at the bottom. A limiting member (2054) is fixedly installed at the center of the slide groove.

5. The narrow-screen borderless liquid crystal display according to claim 4, characterized in that: The moving range of the sliding platform (2053) is constrained by a limiting member (2054) at the center of the sliding groove on the isolation box (2055).

6. The narrow-screen borderless liquid crystal display according to claim 1, characterized in that: A concave cavity is provided at the center of the frame (100), and a reflective sheet (102), a light guide plate (103), a diffusion sheet (104), a lower brightness enhancement sheet (105), and an upper brightness enhancement sheet (106) stacked sequentially from bottom to top in the concave cavity form a backlight system.

7. The narrow-screen borderless liquid crystal display according to claim 6, characterized in that: A sealing ring (107) is provided between the backlight system and the concave cavity of the frame (100).

8. The narrow-screen borderless liquid crystal display according to claim 1, characterized in that: The outer frame of the display panel (200) and the edge of the frame (100) are fixed via a light-shielding adhesive layer (206).

9. The narrow-screen borderless liquid crystal display according to claim 1, characterized in that: The glue storage cavity is located below the edge transverse plate of the frame (100), and its volume is not less than 150% of the volume of the glue tank (101).

10. A mobile phone, characterized in that: A narrow-screen borderless liquid crystal display according to any one of claims 1 to 9, achieving a high screen-to-body ratio without displaying black shadow defects.

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