A PMOLED display screen

Abstract

The application discloses a PMOLED display screen, which comprises a display screen body, a reinforcing film arranged below the display screen body and an FPC extending outward from the display screen body, wherein the FPC comprises a front binding end, one end or both ends of the front binding end sequentially extend outward from front to back in order and are provided with a wave-shaped expansion and contraction section, an elastic locking arm and a rear binding end, a lower surface of the reinforcing film is provided with positioning grooves, the number of the positioning grooves corresponds to the number of the elastic locking arms, the width of the elastic locking arms sequentially decreases from front to back in order, the end of the elastic locking arm is provided with a wedge-shaped barb, and the positioning grooves are provided with retreat-preventing inclined surfaces matched with the wedge-shaped barbs. The FPC is fixed through the wave-shaped expansion and contraction section, the wedge-shaped barb of the elastic locking arm, the retreat-preventing inclined surface on the positioning groove, and the wave-shaped expansion and contraction section can freely expand and contract, the flexible connection can adapt to the tolerance, and the glass slotting is not easy to be damaged.

Description

Technical Field

[0001] This invention relates to the field of display technology, and more specifically, to a PMOLED display screen. Background Technology

[0002] In the actual assembly process, the FPC of the PMOLED display needs to be bent 180° from the front of the screen to the back of the screen before being connected to the main circuit board of the device. The existing connection structure adopts the "ACF hot-press bonding + auxiliary fixing" mode, which has many prominent pain points and is seriously homogenized with the published patent technology, lacking practicality and innovation, as follows: 1. Bending and springback lead to poor contact and low reliability: FPC itself has a certain degree of elasticity. After being bent 180°, a continuous elastic restoring torque is generated inside, attempting to return to a straight state. The existing structure relies solely on the adhesive force of the ACF curing resin for fixation. During long-term use, affected by temperature changes and mechanical vibrations, the ACF adhesive force will gradually weaken. The elastic restoring torque will cause the FPC to slowly spring back, which will cause the conductive particles in the bonding area to detach from the pads, resulting in display flickering, black lines, black screens, and other faults, seriously affecting the product's lifespan.

[0003] 2. Reliance on auxiliary tapes, cumbersome assembly, and high costs: To solve the springback problem, manual steps are usually added to the production line. After the FPC is bent, high-temperature tape or foam adhesive is manually applied to fix the FPC to the back of the screen. This method not only increases the cost of tape materials and labor time, but also results in poor consistency in the position of manual application. After long-term use, the tape will age, fall off, and lose its fixing effect, making subsequent maintenance difficult.

[0004] 3. Rigid connections cannot accommodate tolerances and are prone to damage to FPC: Traditional FPCs are straight strip structures, which are approximately rigid connections. There is an unavoidable assembly tolerance of ±0.2mm-±0.5mm between the fixing points of the PMOLED screen and the frame of the whole machine. When forced to install, the tolerance will be converted into tensile or compressive stress at the bending root of the FPC. Under such stress for a long time, the PI substrate of the FPC will experience fatigue aging, and may even lead to internal circuit breakage and failure.

[0005] 4. Glass slotting is prone to breakage and has low safety: In some published patents, positioning slots are made on the glass substrate of the PMOLED screen to achieve mechanical fixation. However, the PMOLED glass substrate is thin and brittle, and cracks are easily generated during the slotting process. When the locking structure comes into contact with the glass slot wall during assembly, it is also easy to cause glass breakage and reduce product yield. Summary of the Invention

[0006] The technical problem to be solved by this invention is to avoid bending and springback, not to rely on tape for fixing, to achieve flexible connection to adapt to tolerances, and to avoid easy breakage of glass grooves.

[0007] The technical problem to be solved by the present invention is achieved through the following technical solution: To address the aforementioned technical problems, this invention provides a PMOLED display screen, comprising a display screen body, a reinforcing film disposed below the display screen body, and an FPC extending outward from the display screen body. The FPC includes a front bonding end, and one or both ends of the front bonding end extend outward from front to back in sequence as a wave-shaped telescopic section, an elastic locking arm, and a rear bonding end. The lower surface of the reinforcing film is provided with positioning grooves, the number of which corresponds to the number of elastic locking arms. The width of the elastic locking arms decreases sequentially from front to back, and the end of each elastic locking arm is provided with a wedge-shaped barb. The positioning groove is provided with a backstop slope that matches the wedge-shaped barb.

[0008] In a preferred embodiment of the PMOLED display provided by the present invention, the reinforcing film is made of polyimide.

[0009] In a preferred embodiment of the PMOLED display provided by the present invention, the positioning groove is a blind groove, and the depth of the positioning groove is half the thickness of the reinforcing film.

[0010] In a preferred embodiment of the PMOLED display provided by the present invention, the depth of the positioning groove is 0.05mm-0.1mm.

[0011] In a preferred embodiment of the PMOLED display provided by the present invention, the tilt angle of the wedge-shaped barb is 30°-45°, the tilt angle of the anti-reverse slope is the same as the tilt angle of the wedge-shaped barb, the radius of the arc at the front end of the wedge-shaped barb is 0.1mm-0.3mm, and the material of the wedge-shaped barb is the same as that of the substrate layer of the FPC.

[0012] In a preferred embodiment of the PMOLED display provided by the present invention, the width of the root of the wedge-shaped barb is 0.8mm-1.2mm, the width of the end of the wedge-shaped barb is 0.3mm-0.5mm, and the thickness of the wedge-shaped barb is 0.06mm-0.12mm.

[0013] In a preferred embodiment of the PMOLED display provided by the present invention, the bottom of the positioning groove is provided with a micro-bump array, the diameter of the micro-bump is 0.05mm-0.1mm, and the spacing between adjacent micro-bumps is 0.1mm-0.2mm.

[0014] As a preferred embodiment of the PMOLED display provided by the present invention, the wave-shaped telescopic segment includes multiple curved telescopic segments connected in sequence. The shape of the curved telescopic segment is semi-circular, U-shaped or S-shaped. The amplitude of the curved telescopic segment is 0.3mm-0.8mm. There are 3-5 curved telescopic segments.

[0015] In a preferred embodiment of the PMOLED display provided by the present invention, the curved extension segment is semi-circular in shape, the radius of the semi-circular arc is 0.5mm-1mm, the amplitude of the semi-circular arc is 0.3mm-0.8mm, and the length of the wavy extension segment is 5mm-8mm.

[0016] In a preferred embodiment of the PMOLED display provided by the present invention, the FPC is a flexible substrate with a thickness of 0.1mm-0.15mm.

[0017] The present invention has the following beneficial effects: The FPC is bent through a wavy telescopic section and then fixed by the anti-backflow slope on the wedge-shaped barb positioning groove of the elastic locking arm. Because of the wavy telescopic section bending, it can avoid bending rebound. The elastic locking arm fixation does not rely on tape fixation. The wavy telescopic section can extend and retract freely. It is a flexible connection that can adapt to tolerances. The positioning groove under the reinforcing film can avoid the glass being easily broken when grooved. Detailed Implementation

[0018] To enable those skilled in the art to better understand the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0019] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the embodiments. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0020] Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first," "second," or "third" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0021] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application are clearly and completely described. The present invention will now be described in detail with reference to the embodiments, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout.

[0022] This invention provides a PMOLED display screen, comprising a display body, a reinforcing film disposed below the display body, and an FPC extending outward from the display body. The FPC includes a front bonding end, and one or both ends of the front bonding end extend outward from front to back in sequence as a wavy telescopic section, an elastic locking arm, and a rear bonding end. Positioning grooves are formed on the lower surface of the reinforcing film, the number of which corresponds to the number of elastic locking arms. The width of the elastic locking arms decreases sequentially from front to back, and a wedge-shaped barb is provided at the end of each elastic locking arm. An anti-reverse slope matching the wedge-shaped barb is provided on the positioning groove. The FPC is bent by the wavy telescopic section and then fixed by the anti-reverse slope on the positioning groove of the wedge-shaped barb of the elastic locking arm. Because of the wavy telescopic section bending, bending rebound is avoided. The elastic locking arm is fixed without relying on tape. The wavy telescopic section can freely extend and retract, providing a flexible connection that can adapt to tolerances. The positioning groove under the reinforcing film avoids easy breakage of the glass.

[0023] The front end of the FPC has connection terminals that correspond one-to-one with the solder pads of the PMOLED screen, which are used to achieve electrical connection through ACF hot pressing; the FPC substrate is long and strip-shaped to accommodate the connection distance between the PMOLED screen and the motherboard.

[0024] The elastic locking arms are either in pairs or single, extending integrally from both sides of the front binding end of the FPC near the binding area, located between the rear binding end and the wavy telescopic section. The distance between the root of the elastic locking arm and the starting point of the wavy telescopic section does not exceed 5mm to ensure uniform force transmission.

[0025] Furthermore, the reinforcing membrane is made of polyimide.

[0026] Furthermore, the positioning groove is a blind groove, and its depth is half the thickness of the reinforcing film. That is, in this embodiment, the depth of the positioning groove is 0.05mm-0.1mm. This ensures that the reinforcing film will not penetrate and damage the screen, while also providing sufficient locking space for the elastic locking arm.

[0027] Furthermore, the inclination angle of the wedge-shaped barb is 30°-45°, the inclination angle of the anti-reverse slope is the same as the inclination angle of the wedge-shaped barb, the radius of the arc at the front end of the wedge-shaped barb is 0.1mm-0.3mm, and the material of the wedge-shaped barb is the same as that of the substrate layer of the FPC, so that it has good elastic recovery ability.

[0028] Furthermore, the width of the root of the wedge-shaped barb is 0.8mm-1.2mm, the width of the end of the wedge-shaped barb is 0.3mm-0.5mm, and the thickness of the wedge-shaped barb is 0.06mm-0.12mm.

[0029] Furthermore, the bottom of the positioning groove is provided with an array of micro-protrusions, the diameter of which is 0.05mm-0.1mm and the spacing between adjacent micro-protrusions is 0.1mm-0.2mm, in order to increase the coefficient of friction.

[0030] Furthermore, the wavy expansion segment includes multiple sequentially connected curved expansion segments. The curved expansion segments are semi-circular, U-shaped, or S-shaped, with an amplitude of 0.3mm-0.8mm, and there are 3-5 curved expansion segments. In this embodiment, the curved expansion segment is semi-circular, with a radius of 0.5mm-1mm, an amplitude of 0.3mm-0.8mm, and a length of 5mm-8mm. It can achieve an elastic expansion amount of 0.2mm-0.8mm along the length of the FPC, adapting to assembly tolerances of ±0.5mm or more.

[0031] Furthermore, the FPC is a flexible substrate material, and the thickness of the FPC is 0.1mm-0.15mm.

[0032] Assembly process: The first step, ACF hot-press bonding: Align the connection terminals at the front end of the FPC with the pad area of ​​the PMOLED screen, and use the ACF hot-press bonding process (temperature 180℃-200℃, pressure 0.3MPa-0.5MPa, time 10s-15s) to deform the ACF conductive particles under pressure, thereby achieving electrical connection and initial fixation between the FPC and the screen.

[0033] The second step is bending and locking: By hand, bend the FPC 180° towards the back along the edge of the PMOLED screen. During the bending process, the elastic locking arm is squeezed by the edge of the screen and undergoes slight elastic deformation. The arc-shaped guide surface at the end guides the elastic locking arm to slide into the corresponding positioning groove. When the FPC is bent into place and fits against the back of the screen, the elastic locking arm elastically resets, and the wedge-shaped barb at the end precisely engages with the anti-reverse slope of the positioning groove, forming an irreversible mechanical self-locking, completely offsetting the elastic restoring torque of the FPC and achieving anti-warping.

[0034] The third step is tolerance self-adaptation: Connect the end of the FPC away from the bonding area to the main circuit board of the whole machine. During the connection process, the wave-shaped expansion segment will automatically stretch or compress according to the actual installation position of the screen and the motherboard to absorb assembly tolerances. In subsequent use, when the whole machine is subjected to vibration and temperature changes, the wave-shaped expansion segment will undergo elastic deformation simultaneously to buffer stress and prevent stress from being transmitted to the bonding area and locking structure.

[0035] Key design requirements: The elastic coefficient k_wave of the wave-shaped telescopic section ≤ 0.3·k_arm (k_arm is the axial stiffness of the locking arm). This ensures that during assembly, the wave-shaped telescopic section first undergoes deformation to absorb the tolerance. Only after the telescopic amount reaches 70% of the maximum elastic deformation will the locking arm begin to bear the clamping force, thus avoiding unnecessary fatigue loads on the locking arm and extending its service life.

[0036] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0037] Obviously, the embodiments described above are merely some embodiments of this application, not all embodiments, and do not limit the patent scope of this application. This application can be implemented in many different forms; on the contrary, the purpose of providing these embodiments is to make the disclosure of this application more thorough and comprehensive. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing specific embodiments, or make equivalent substitutions for some of the technical features. Any equivalent structures made using the specification of this application, directly or indirectly applied to other related technical fields, are similarly within the patent protection scope of this application.

Claims

1. A PMOLED display screen, characterized in that, It includes a display screen body, a reinforcing film disposed below the display screen body, and an FPC extending outward from the display screen body. The FPC includes a front binding end, and one or both ends of the front binding end extend outward from front to back in sequence as a wave-shaped telescopic section, an elastic locking arm, and a rear binding end. The lower surface of the reinforcing film is provided with positioning grooves, the number of positioning grooves corresponding to the number of elastic locking arms. The width of the elastic locking arms decreases sequentially from front to back, and the end of the elastic locking arm is provided with a wedge-shaped barb. The positioning groove is provided with a backstop slope that matches the wedge-shaped barb.

2. The PMOLED display screen according to claim 1, characterized in that, The reinforcing membrane is made of polyimide.

3. The PMOLED display screen according to claim 1, characterized in that, The positioning groove is a blind groove, and the depth of the positioning groove is half the thickness of the reinforcing membrane.

4. The PMOLED display screen according to claim 3, characterized in that, The depth of the positioning groove is 0.05mm-0.1mm.

5. The PMOLED display screen according to claim 1, characterized in that, The inclination angle of the wedge-shaped barb is 30°-45°, the inclination angle of the anti-reverse slope is the same as the inclination angle of the wedge-shaped barb, the radius of the arc at the front end of the wedge-shaped barb is 0.1mm-0.3mm, and the material of the wedge-shaped barb is the same as that of the substrate layer of the FPC.

6. The PMOLED display screen according to claim 1, characterized in that, The width of the root of the wedge-shaped barb is 0.8mm-1.2mm, the width of the end of the wedge-shaped barb is 0.3mm-0.5mm, and the thickness of the wedge-shaped barb is 0.06mm-0.12mm.

7. The PMOLED display screen according to claim 1, characterized in that, The bottom of the positioning groove is provided with an array of micro-protrusions, the diameter of which is 0.05mm-0.1mm and the spacing between adjacent micro-protrusions is 0.1mm-0.2mm.

8. The PMOLED display screen according to claim 1, characterized in that, The wave-shaped expansion segment includes multiple curved expansion segments connected in sequence. The curved expansion segment is semi-circular, U-shaped, or S-shaped. The amplitude of the curved expansion segment is 0.3mm-0.8mm. There are 3-5 curved expansion segments.

9. The PMOLED display screen according to claim 8, characterized in that, The curved telescopic section is semi-circular in shape, with a radius of 0.5mm-1mm and an amplitude of 0.3mm-0.8mm. The length of the wavy telescopic section is 5mm-8mm.

10. The PMOLED display screen according to claim 1, characterized in that, The FPC is a flexible substrate with a thickness of 0.1mm-0.15mm.