An OLED-based ultra-thin light guide system light-emitting module

Abstract

The utility model relates to a kind of super-thin light guide system luminous module based on OLED, including flexible OLED light source array layer, microstructure light guide plate, optical brightening composite film layer, protective packaging layer;Microstructure light guide plate is located above flexible OLED light source array layer, the microstructure light guide plate lower surface is formed by laser dotting and is recessed microstructure array, the microstructure array is trapezoidal prism array or scattering dot array;Optical brightening composite film layer includes two layers of orthogonal prism sheet and a layer of diffuse reflection film from top to bottom sequentially arranged, the lower surface of upper orthogonal prism sheet is equipped with lower microstructure array, space of assembly upper microstructure array is formed between adjacent lower microstructure, the upper surface of lower orthogonal prism sheet is equipped with upper microstructure array, upper orthogonal prism sheet and lower orthogonal prism sheet are assembled to buckle;The module is innovatively combined with OLED self-luminous characteristics and light guide technology, realizes the illumination solution of super-thin, high uniformity, high energy efficiency.

Description

Technical Field

[0001] This utility model relates to the field of display and lighting technology, specifically to an OLED-based ultra-thin light guide system light-emitting module. Background Technology

[0002] In the field of display and lighting technology, OLED (Organic Light Emitting Diode), as a self-emissive display technology, achieves integrated display and light emission without a backlight module. It boasts significant advantages such as ultra-thin design (typically less than millimeters thick), flexibility, high response speed (microseconds), and wide viewing angle (over 170°). Compared to traditional LCD technology, OLED eliminates the need for a backlight module and light guide plate, significantly reducing the overall thickness and solving the structural complexity and thickness issues caused by the presence of a backlight module in LCDs.

[0003] However, existing OLED technology still has significant limitations in specific application scenarios. On the one hand, although each pixel in an OLED can emit light independently and achieve near-infinite contrast (black areas can be completely turned off), in lighting systems requiring large-area uniform light distribution or specific optical characteristics, relying solely on OLED pixel arrays is insufficient to achieve ideal light efficiency uniformity. On the other hand, traditional light guide systems are mainly designed for LCD technology, and their structures are typically thicker (2-3mm or more), which cannot match the ultra-thin characteristics of OLEDs, resulting in technical bottlenecks in applications pursuing extreme thinness.

[0004] Furthermore, the inherent burn-in problem of OLED technology severely impacts its lifespan. When displaying a fixed image for an extended period, some pixels exhibit ghosting due to uneven aging, particularly noticeable in areas with fixed icons such as signal bars and navigation bars. This defect is especially prominent in lighting or display systems that require continuous display of fixed content, limiting the application expansion of OLED in related fields.

[0005] While MiniLED technology, as an improvement on LCD, achieves more precise dynamic backlight control by reducing LED size, it still relies on a backlight module and cannot reach the ultra-thin level of OLED, nor does it fundamentally solve the thickness problem of the light guide system. Currently, there is a lack of a technical solution on the market that can effectively combine the self-emissive characteristics of OLED with an ultra-thin light guide system, especially in achieving a thickness of less than 1mm, high light uniformity, and anti-burn-in performance, where there are significant technical gaps.

[0006] The closest existing technology can be found in Chinese utility model patent CN209417822U, "An OLED Display Panel". This patent discloses the OLED display structure, but does not involve the design and integration of an ultra-thin light guide system, and cannot solve the contradiction between light distribution uniformity and thickness limitation. Summary of the Invention

[0007] Given that existing OLED display technology often faces visual defects due to low surface flatness of the cover glass when applied to large-size curved displays, and that traditional OLED structures are prone to significant step differences and uneven light distribution when achieving ultra-thin designs, this invention specifically optimizes the light guide system structure in OLED display technology. Through an innovative ultra-thin light guide system structure design, it aims to effectively solve the step difference filling problem in the curvature process of large-size OLED displays, significantly improving light uniformity and display quality. Simultaneously, it optimizes the device structure to extend lifespan, achieving thinner, lower power consumption, higher efficiency, and more stable OLED display effects, providing an ideal solution for automotive displays and other high-end display applications.

[0008] To achieve the above objectives, the present invention adopts the following technical solution:

[0009] An ultra-thin light guide system module based on OLED includes a flexible OLED light source array layer, a microstructure light guide plate, an optical brightness enhancement composite film layer, and a protective encapsulation layer. The microstructure light guide plate is located above the flexible OLED light source array layer. The lower surface of the microstructure light guide plate is formed by laser dotting to create a concave microstructure array, which is a trapezoidal prism array, a scattering point array, or a combination of both. The optical brightness enhancement composite film layer includes two orthogonal prism sheets and a diffuse reflection film arranged sequentially from top to bottom. The lower surface of the upper orthogonal prism sheet has a lower microstructure array, which is a square pyramid structure with its tip pointing downwards. Spaces for assembling upper microstructure arrays are formed between adjacent lower microstructures. The upper surface of the lower orthogonal prism sheet has an upper microstructure array, which is a square pyramid structure with its tip pointing upwards. The upper and lower orthogonal prism sheets are assembled by interlocking. The protective encapsulation layer encapsulates the flexible OLED light source array layer, the microstructure light guide plate, and the optical brightness enhancement composite film layer.

[0010] As a preferred embodiment of this invention, the ultra-thin light guide system light-emitting module further includes a driving control circuit, which is used to control the light emission intensity of each OLED pixel in the flexible OLED light source array layer through pulse width modulation.

[0011] As a preferred embodiment of this invention, the thickness of the flexible OLED light source array layer is controlled at 0.1-0.2 mm; the microstructure light guide plate is made of PMMA material with a thickness of 0.2-0.3 mm; the thickness of the optical brightness enhancement composite film layer is 0.08-0.12 mm; and the total thickness of the protective encapsulation layer is 0.05 mm.

[0012] As a preferred embodiment of this invention, the acute angle of the trapezoidal prism is 45°-65°, and the scattering point is hemispherical.

[0013] As a preferred embodiment of this invention, the protective encapsulation layer comprises a flexible PET protective layer and a SiO2 barrier layer arranged sequentially from top to bottom.

[0014] Advantages and beneficial effects of this utility model:

[0015] (1) This utility model addresses the problems of complex structure, large thickness, uneven brightness and low energy efficiency of existing light guide systems by providing an ultra-thin light guide system light-emitting module based on OLED. By innovatively combining the self-emissive characteristics of OLED with light guide technology, an ultra-thin, highly uniform and highly energy-efficient lighting solution is achieved.

[0016] (2) This utility model effectively solves the problem of step filling in the process of large-size OLED display screen curvature, significantly improves light uniformity and display quality, and optimizes the device structure to extend service life, providing an ideal solution for automotive display and other high-end display applications.

[0017] (3) The stacked structure of the flexible OLED array and the ultra-thin light guide plate of this utility model controls the overall thickness to within 0.45mm, which is more than 60% thinner than the traditional light guide system.

[0018] (4) This utility model introduces intelligent drive control technology, realizes high-precision local dimming function, and greatly improves energy efficiency ratio. This module can be widely used in ultra-thin display backlight, intelligent lighting, vehicle display and wearable device fields. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the embodiments will be briefly described below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. In the drawings:

[0020] Figure 1 This is a schematic diagram of the light-emitting module of the ultra-thin light guide system of this utility model;

[0021] Figure 2 This is a schematic diagram of the microstructure light guide plate of this utility model;

[0022] Figure 3 This is a schematic diagram showing the installation of the upper orthogonal prism sheet and the lower orthogonal prism sheet of this utility model. Detailed Implementation

[0023] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0024] like Figures 1 to 3 As shown, this embodiment provides an ultra-thin light guide system module based on OLED, including a flexible OLED light source array layer 1, a microstructure light guide plate 2, an optical brightness enhancement composite film layer 3, and a protective encapsulation layer 4; wherein, the flexible OLED light source array layer includes a transparent conductive substrate, an ITO anode layer, a hole injection layer, a hole transport layer, a multicolor organic light-emitting layer, an electron transport layer, and a metal cathode layer arranged sequentially, and the thickness of the flexible OLED light source array layer is controlled at 0.1-0.2mm; the multicolor organic light-emitting layer adopts a red, green, and blue pixel array arrangement with a pixel pitch of 50-100μm, and uniform light output is achieved by precisely controlling the light emission intensity of each pixel;

[0025] In this embodiment, the flexible OLED light source array layer 1 can adopt an existing structure, and its structure itself is not an improvement point of this application, so it will not be described in detail.

[0026] The microstructure light guide plate 2 is located above the flexible OLED light source array layer, with a thickness of 0.2-0.3 mm, and is made of high-transmittance optical-grade PMMA (polymethyl methacrylate) material. The lower surface of the microstructure light guide plate is formed by laser dotting to form a concave microstructure array. The microstructure array is a trapezoidal prism array or a scattering point array, or a combination of a trapezoidal prism array and a scattering point array. The acute angle of the trapezoidal prism 21 is 45°-65°, and the scattering point 22 is hemispherical, used to convert the OLED point light source into a uniform surface light source.

[0027] The optical brightness enhancement composite film layer 3 includes two orthogonal prism sheets and a diffuse reflection film arranged sequentially from top to bottom, with a thickness of 0.08-0.12mm. The optical brightness enhancement composite film layer is located above the microstructure light guide plate and is used to improve the front brightness and improve the viewing angle characteristics. The lower surface of the upper orthogonal prism sheet 31 is provided with a lower microstructure array. The lower microstructure 311 is a square pyramid structure with the tip pointing downwards and the height is controlled at 25μm. A space for assembling the upper microstructure array is formed between adjacent lower microstructures. The upper surface of the lower orthogonal prism sheet 32 ​​is provided with an upper microstructure array. The upper microstructure 321 is a square pyramid structure with the tip pointing upwards. The upper orthogonal prism sheet and the lower orthogonal prism sheet are assembled together by interlocking.

[0028] The protective encapsulation layer 4 adopts a multi-layer composite structure, including a flexible PET protective layer and a SiO2 barrier layer arranged sequentially from top to bottom, with a total thickness of 0.05mm. It is used to encapsulate the flexible OLED light source array layer, the microstructure light guide plate, and the optical brightness enhancement composite film layer, providing water and oxygen barrier and mechanical protection.

[0029] Furthermore, the ultra-thin light guide system light-emitting module in this embodiment also includes a driving control circuit, which is used to precisely control the light emission intensity of each OLED pixel in the flexible OLED light source array layer through pulse width modulation (PWM).

[0030] The working principle of this invention is as follows: When an external voltage is applied to the flexible OLED light source array layer, holes are injected into the ITO anode layer and electrons are injected into the metal cathode layer. Charge carriers recombine in the multicolor organic light-emitting layer to excite photons. Since OLEDs are self-emissive, no traditional backlight is needed; light directly enters the microstructure light guide plate. The trapezoidal prism and / or scattering points on the lower surface of the microstructure light guide plate are used to redirect lateral light rays to the vertical direction and disperse light from strong light areas to weak light areas, achieving uniform light distribution. After further optimization of the optical brightness enhancement composite film layer, the final output achieves high uniformity (≥90%) and high brightness (≥500 cd / m²). 2 The light source is a surface light source. In this embodiment, the driving control circuit adjusts the luminous intensity of each OLED pixel in real time according to preset parameters to achieve local dimming function, which saves more than 30% energy compared with traditional light guide systems.

[0031] The innovations of this invention lie in: firstly, the organic integration of OLED's self-emissive characteristics with light guide plate technology, solving the uniformity problem of OLED as a surface light source through a precisely designed microstructure light guide plate; secondly, the use of a stacked structure of flexible OLED array and ultra-thin light guide plate, keeping the overall thickness within 0.45mm, more than 60% thinner than traditional light guide systems; and thirdly, the introduction of intelligent drive control technology, achieving high-precision local dimming and significantly improving energy efficiency. This module can be widely used in ultra-thin display backlighting, intelligent lighting, automotive displays, and wearable devices.

[0032] The above describes specific embodiments of this utility model, but the scope of protection of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the scope of protection of this utility model. Therefore, the scope of protection of this utility model should be determined by the scope of the claims.

Claims

1. A light-emitting module for an ultra-thin light guide system based on OLED, characterized in that, The system comprises a flexible OLED light source array layer, a microstructure light guide plate, an optical brightness enhancement composite film layer, and a protective encapsulation layer. The microstructure light guide plate is located above the flexible OLED light source array layer. The lower surface of the microstructure light guide plate is formed by laser dotting to create a concave microstructure array, which may be a trapezoidal prism array, a scattering point array, or a combination of both. The optical brightness enhancement composite film layer includes two orthogonal prism sheets and a diffuse reflection film arranged sequentially from top to bottom. The lower surface of the upper orthogonal prism sheet has a lower microstructure array, which is a square pyramid structure with its tip pointing downwards. Spaces for assembling upper microstructure arrays are formed between adjacent lower microstructures. The upper surface of the lower orthogonal prism sheet has an upper microstructure array, which is also a square pyramid structure with its tip pointing upwards. The upper and lower orthogonal prism sheets are assembled by interlocking. The protective encapsulation layer encapsulates the flexible OLED light source array layer, the microstructure light guide plate, and the optical brightness enhancement composite film layer.

2. The OLED-based ultra-thin light guide system light-emitting module according to claim 1, characterized in that, The ultra-thin light guide system light-emitting module also includes a driving control circuit, which is used to control the light emission intensity of each OLED pixel in the flexible OLED light source array layer through pulse width modulation.

3. A light-emitting module for an ultra-thin light guide system based on OLED according to claim 1 or 2, characterized in that, The thickness of the flexible OLED light source array layer is controlled at 0.1-0.2 mm; the microstructure light guide plate is made of PMMA material with a thickness of 0.2-0.3 mm; the thickness of the optical brightness enhancement composite film layer is 0.08-0.12 mm; and the total thickness of the protective encapsulation layer is 0.05 mm.

4. A light-emitting module for an ultra-thin light guide system based on OLED according to claim 1 or 2, characterized in that, The acute angle of the trapezoidal prism is 45°-65°, and the scattering point is hemispherical.

5. A light-emitting module for an ultra-thin light guide system based on OLED according to claim 1 or 2, characterized in that, The protective encapsulation layer includes a flexible PET protective layer and a SiO2 barrier layer arranged sequentially from top to bottom.

Images