Backlight mechanism based on transmission-type OLED

Abstract

The invention discloses a transmission-type OLED-based backlight mechanism, which comprises an OLED screen and a backlight assembly, and is characterized in that the OLED screen further comprises a plurality of first light detection modules, and the backlight assembly is arranged on the surface of one side of the OLED screen; the backlight assembly comprises a plurality of dimming mechanisms, each dimming mechanism is composed of a shading film, a winding roller and a driving mechanism, and the moving directions of the adjacent shading films are opposite. Each shading film is composed of a shading layer and a smooth layer, the shading layer is composed of a plurality of shading particles, and the distribution density of the shading particles is increased in a stepped mode; the second light detection modules and the third light detection modules are arranged on the surfaces of the two sides of the backlight assembly respectively. The background light transmittance can be adjusted according to the light intensity of the two sides of the OLED screen, the image display effect is enhanced, and the method has the advantages of being smaller in power consumption, lower in input cost and capable of being suitable for the curved OLED screen.

Description

Technical Field

[0001] The present invention relates to the technical field of OLED screens, and in particular to a backlight mechanism based on a transmission-type OLED. Background Art

[0002] The transmissive OLED screen is a screen that combines OLED technology with transparent display features. Its transmittance can reach more than 45%. When displaying information, it can minimize the occlusion of the background environment by the screen components. Therefore, the transmissive OLED screen has obvious advantages in transparency and display quality, and is widely used in commercial displays, cultural exhibitions, rail transit and other fields.

[0003] Existing OLED screens use self-luminous technology, which enables each pixel of the OLED screen to emit light independently without the support of a backlight. This feature also provides the technical basis for transmissive OLED screens to provide high-transparency display effects and high display quality.

[0004] Although the transmissive OLED screen itself can display information without a backlight component, this characteristic can easily cause the light intensity on both sides of the screen to affect the contrast between the displayed pattern and the background behind the OLED screen when the transmissive OLED screen displays an image. If the light in the background area behind the OLED screen is strong, it will cause people to see the information displayed on the screen with dim colors and blurred edges, thereby weakening the advantage of the OLED screen in display quality. Therefore, when the transmissive OLED screen is used in areas where the light intensity changes greatly or the light intensity changes frequently, a backlight mechanism is still needed to adjust the background light of the transmissive OLED screen to ensure the display effect of the transmissive OLED screen.

[0005] In the prior art, the utility model patent with publication number: CN205845419U discloses an OLED display with a backlight adjustment function, including a transparent OLED display screen, an electronic diffusion dimming sheet connected to the back of the transparent OLED display screen through an air isolation layer or adhesive, the electronic diffusion dimming sheet is a smectic phase liquid crystal electronic diffusion dimming sheet or a PDLC polymer dispersed liquid crystal dimming sheet, the transparent OLED display screen is connected to an OLED display screen drive control device, and the electronic diffusion dimming sheet is connected to a dimming controller. The utility model adds an electronic diffusion dimming sheet to the back of a traditional transparent OLED display screen, and realizes the function of adjusting the backlight of the transparent OLED display screen. In situations where the resolution and clarity of the displayed image are required to be high, the display contrast can be enhanced by selecting a variable uniform light diffusion backlight mode, greatly improving the image display effect and display quality, and in the fully transparent backlight mode, a high light transmittance effect can be achieved, which ensures both the display effect and the transmittance effect.

[0006] Based on the above disclosed prior art content, the prior art uses an electronic diffusion dimming sheet to adjust the backlight of the OLED display screen, thereby meeting the display effect of the transparent OLED display screen. In addition to the above dimming method, the prior art also uses a liquid crystal dimming glass to adjust the backlight of the transmissive OLED screen.

[0007] However, the use of electronic diffusion dimming sheets for backlight adjustment in the above-mentioned prior art is prone to cause visual blur and color perception changes, affecting the display effect; and liquid crystal dimming glass cannot achieve the expected dimming effect under extreme weather conditions. Secondly, the control system of liquid crystal dimming glass consumes a lot of power and there are certain electrical safety risks.

[0008] If the transparent OLED display is used for large outdoor displays, both the electronic diffuser and the liquid crystal dimming glass need to be powered on to realize the backlight adjustment function. After powering on, a certain amount of heat will be generated. If the application area is large, the heat generated will also be large, which can easily lead to heat accumulation in the OLED display, causing the OLED display to overheat, which is not conducive to the temperature control of the transparent OLED display and will affect the stability of the OLED display. Secondly, the price of liquid crystal dimming glass is relatively expensive. When it is used for backlight adjustment of large-size outdoor transmissive OLED screens, it is not conducive to cost control. In addition, the bending technology of liquid crystal dimming glass is difficult, and the custom processing cost is high, which is not conducive to its application on curved transmissive OLED screens. Summary of the invention

[0009] The object of the present invention is to provide a backlight mechanism based on a transmissive OLED to solve the problems raised in the above background technology.

[0010] To achieve the above-mentioned object, the present invention provides the following technical solution: a backlight mechanism based on a transmissive OLED, comprising an OLED screen and a backlight assembly, wherein the backlight assembly is arranged on a side surface of the OLED screen;

[0011] The OLED screen also includes a plurality of first light detection modules;

[0012] The backlight assembly includes a plurality of dimming mechanisms, each of which is composed of a shading film, a plurality of winding rollers and a plurality of driving mechanisms, the two ends of the shading film are respectively connected to the surface of the winding roller, the plurality of driving mechanisms drive the winding roller to rotate, and the shading films in adjacent dimming mechanisms move in opposite directions;

[0013] Each of the light-shielding films is composed of a light-shielding layer and a smooth layer, the light-shielding layer is composed of a plurality of light-shielding particles, and the distribution density of the light-shielding particles on the light-shielding layer increases stepwise along the length of the light-shielding film, and the directions in which the density of the light-shielding particles on the surfaces of adjacent light-shielding films increases are opposite;

[0014] A plurality of second light detection modules and a plurality of third light detection modules are respectively arranged on both sides of the interior of the backlight assembly.

[0015] Preferably, the light-shielding layer is arranged on the surface of the smooth layer.

[0016] Preferably, the light-shielding layer is arranged inside the smooth layer.

[0017] Preferably, a plurality of the first light detection modules are installed on the surface of the OLED screen, and the plurality of the first light detection modules are located between the OLED screen and the dimming mechanism.

[0018] Preferably, each of the dimming mechanisms further comprises a light-transmitting plate, and a surface of each of the light-transmitting plates is distributed parallel to a surface of the OLED screen.

[0019] Preferably, the surface of the light-transmitting plate is slidably fitted to the surface of the smooth layer.

[0020] Preferably, both ends of the winding roller are respectively engaged with the output ends of the driving mechanism.

[0021] Preferably, a power supply module is provided inside the backlight assembly, and the power supply module is electrically connected to the OLED screen and a plurality of driving mechanisms respectively.

[0022] Preferably, the backlight assembly further includes a control unit;

[0023] The control unit is electrically connected to the OLED screen, a plurality of first light detection modules, a plurality of second light detection modules, a plurality of third light detection modules and a plurality of driving mechanisms respectively.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] 1. The present invention achieves the effect of reducing the use of electric energy and improving the flexibility of practical application by setting a dimming mechanism. The dimming mechanism drives the shading film to move through the driving mechanism, and achieves the effect of uniformly adjusting the intensity of background light by overlapping multiple shading films. The mechanical drive method does not require continuous power supply to maintain the current light adjustment state, which not only reduces the use of electric energy, but also avoids the problem of heat accumulation, and can effectively ensure the long-term normal operation of the OLED screen; secondly, the dimming mechanism uses the shading film as the main light adjustment component. The shading film can not only flexibly fit the curvature of the OLED screen, but also can move normally while maintaining the curvature, so as to achieve the effect of uniformly adjusting the backlight of the OLED screen. The adaptive customization cost is low, which is not only conducive to the control of investment costs, but also effectively expands the scope of practical application.

[0026] 2. The present invention achieves the effect of automatically adjusting the backlight according to the light intensity on both sides of the OLED screen by setting the first light detection module, the second light detection module and the third light detection module. The second light detection module and the third light detection module can respectively measure the light intensity of the space on both sides of the OLED screen in real time, and operate the dimming mechanism according to the difference in light intensity on both sides of the OLED screen. The first light detection module can detect the transmittance of the dimming mechanism, thereby forming a backlight adjustment system with a higher degree of automation, reducing manual intervention and ensuring the display effect of the OLED screen. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is a schematic diagram of the appearance structure of the OLED screen and backlight assembly in the first embodiment of the present invention;

[0028] Figure 2 It is a partial rear view structural diagram of the backlight assembly in the first embodiment of the present invention;

[0029] Figure 3 This is a schematic diagram of the exploded front view of the dimming mechanism components in the first embodiment of the present invention;

[0030] Figure 4 This is a schematic diagram of an exploded rear view of the dimming mechanism components in Embodiment 1 of the present invention;

[0031] Figure 5 It is a schematic diagram of a partial top-sectional structure of a dimming mechanism in Embodiment 1 of the present invention;

[0032] Figure 6 is a schematic diagram of a partial top-sectional structure of a backlight assembly in Embodiment 1 of the present invention;

[0033] Figure 7 It is a schematic diagram of the main structure of the shading layer in the first embodiment of the present invention.

[0034] Figure 8 Schematic diagram of the position distribution of the shading film in the second embodiment of the present invention.

[0035] Fig. 9 Schematic diagram of the position distribution of the light shielding film in the third embodiment of the present invention;

[0036] Fig.10 Schematic diagram of the position distribution of the shading film in the fourth embodiment of the present invention.

[0037] In the figure:

[0038] 100. OLED screen; 110. first light detection module;

[0039] 200, backlight assembly; 210, second light detection module; 220, power supply module; 230, third light detection module; 240, dimming mechanism; 241, light-transmitting plate; 242, shading film; 2421, shading layer; 2422, smooth layer; 243, winding roller; 244, driving mechanism; 250, control unit. DETAILED DESCRIPTION

[0040] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. 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 creative work are within the scope of protection of the present invention.

[0041] See also Figures 1 to 10 , the present invention provides the following four embodiments:

[0042] Embodiment 1:

[0043] See also Figures 1 to 7 A backlight mechanism based on a transmissive OLED includes an OLED screen 100 and a backlight assembly 200 , wherein the backlight assembly 200 is disposed on a side surface of the OLED screen 100 .

[0044] The backlight assembly 200 is used to adjust the light intensity of the background area of ​​the OLED screen 100 , thereby improving the display effect of the OLED screen 100 .

[0045] See also Figure 3 and Figure 4 The backlight assembly 200 includes a plurality of dimming mechanisms 240, each of which is composed of a shading film 242, a plurality of winding rollers 243 and a plurality of driving mechanisms 244. The two ends of the shading film 242 are respectively connected to the surface of the winding roller 243, and a gear wheel is provided at both ends of the winding roller 243. The output end of the driving mechanism 244 is meshed with the two ends of the winding roller 243. The plurality of driving mechanisms 244 drive the winding roller 243 to rotate, and the moving directions of the shading films 242 in adjacent dimming mechanisms 240 are opposite.

[0046] See also Figure 3 and Figure 4 Each light shielding film 242 includes a light shielding layer 2421 and a smooth layer 2422 .

[0047] See also Figure 7Each shading film 242 is composed of a shading layer 2421 and a smooth layer 2422. The shading layer 2421 is composed of a plurality of shading particles, and the distribution density of the shading particles on the shading layer 2421 increases stepwise along the length of the shading film 242. The directions in which the density of the shading particles on the surfaces of adjacent shading films 242 increases are opposite. The adjacent shading films 242 are driven to move in opposite directions by the driving mechanism 244. The shading layers 2421 on the surfaces of the two shading films 242 overlap with each other, forming a uniform backlight adjustment effect, reducing the abruptness during backlight adjustment, making the backlight adjustment process of the OLED screen 100 smoother and more natural, while also maintaining the uniformity of the backlight adjustment.

[0048] The dimming mechanism 240 drives the shading film 242 to move through the driving mechanism 244, and the shading particles on the surface of the shading layer 2421 block the light due to the overlap between the multiple shading films 242, and the shading particles are evenly distributed in the same density gradient range, and the light blocking is also uniform. The multiple shading layers 2421 overlap with each other, which can eliminate the uneven shading problem and the abrupt backlight adjustment process caused by the change in the density of the shading particles when the multiple shading layers 2421 move. Not only does it achieve the effect of uniformly adjusting the background light intensity, but it also adopts a mechanically driven movement of the shading film 242 to maintain the current light adjustment state without continuous power supply, thereby reducing the use of electricity and avoiding the problem of heat accumulation, which can effectively ensure the long-term normal operation of the OLED screen 100.

[0049] Secondly, the dimming mechanism 240 uses the shading film 242 as the main light adjusting component. The shading film 242 can not only flexibly fit the curvature of the OLED screen 100, but also move normally while maintaining the curvature, thereby achieving the effect of uniformly adjusting the backlight of the OLED screen 100. The adaptive customization cost is low, which is not only conducive to the control of investment costs, but also effectively expands the scope of practical applications.

[0050] See also Figures 3 to 5 Each dimming mechanism 240 also includes a light-transmitting plate 241 . The surface of each light-transmitting plate 241 is parallel to the surface of the OLED screen 100 . The smooth layer 2422 of each light-shielding film 242 is slidably fitted to the surface of the light-transmitting plate 241 .

[0051] The light-transmitting plate 241 is a transparent glass plate, which can be adaptively customized according to the shape of the OLED screen 100, so that the light-transmitting plate 241 and the OLED screen 100 are maintained in a parallel state. The light-transmitting plate 241 is not only used to limit the moving space of the light-shielding film 242, but also used to keep the light-shielding film 242 flat to prevent the light-shielding film 242 from wrinkling during movement.

[0052] See also Figure 1The OLED screen 100 further includes a plurality of first light detection modules 110 , which are mounted on the surface of the OLED screen 100 and are located between the OLED screen 100 and the dimming mechanism 240 .

[0053] See also Figure 6 The backlight assembly 200 further includes a plurality of second light detection modules 210 and a plurality of third light detection modules 230 , and the plurality of second light detection modules 210 and the plurality of third light detection modules 230 are respectively disposed on both side surfaces of the backlight assembly 200 .

[0054] The backlight assembly 200 further includes a control unit 250 , which is electrically connected to the OLED screen 100 , a plurality of first light detection modules 110 , a plurality of second light detection modules 210 , a plurality of third light detection modules 230 , and a plurality of driving mechanisms 244 , respectively.

[0055] The first light detection module 110, the second light detection module 210 and the third light detection module 230 all use light intensity sensors. The second light detection module 210 and the third light detection module 230 can respectively measure the light intensity of the space on both sides of the OLED screen 100 in real time, and the light intensity values ​​detected by the first light detection module 110, the second light detection module 210 and the third light detection module 230 are fed back to the control unit 250 in real time. After detecting the light intensity value, the control unit 250 operates the dimming mechanism 240 according to the difference in light intensity on both sides of the OLED screen 100.

[0056] The first light detection module 110 can detect the transmittance of the dimming mechanism 240 to provide feedback on whether the current shading state of the shading film 242 meets the expected effect, and cooperate with the control unit 250 to automatically judge and control the driving mechanism 244 to operate the dimming mechanism 240, thereby forming a more automated backlight adjustment system, reducing manual intervention and ensuring the display effect of the OLED screen 100.

[0057] See also Figure 6 A power supply module 220 is provided inside the backlight assembly 200. The power supply module 220 is electrically connected to the OLED screen 100 and multiple driving mechanisms 244 respectively. The power supply module 220 is used to provide power supply to the OLED screen 100 and the driving mechanisms 244 respectively. The power supply lines of the first light detection module 110, the second light detection module 210, the third light detection module 230 and the control unit 250 are connected to the power supply lines of the driving mechanisms 244.

[0058] In practical applications, the OLED screen 100 is a flat surface.

[0059] The light shielding film 242 is located between the OLED screen 100 and the light-transmitting plate 241 . The light shielding layer 2421 is disposed on the surface of the smooth layer 2422 . The light shielding layer 2421 is located on the side of the light shielding film 242 facing the OLED screen 100 .

[0060] The driving mechanism 244 drives the shading film 242 to move along the surface of the light-transmitting plate 241. During this process, the smooth layer 2422 of the shading film 242 slides along the surface of the light-transmitting plate 241. The light-transmitting plate 241 flattens the shading film 242 and reduces the wear of the shading layer 2421 when it moves through the smooth layer 2422. The backlight of the OLED screen 100 can be flexibly adjusted through the movement of the shading film 242 to meet the needs of practical applications.

[0061] Embodiment 2:

[0062] Based on the surface characteristics of the OLED screen 100 and the distribution position of the light shielding film 242 proposed by the present invention, another embodiment is proposed:

[0063] See also Figure 8 , when the OLED screen 100 is convex.

[0064] The light shielding film 242 is located between the OLED screen 100 and the light-transmitting plate 241 . The light shielding layer 2421 is disposed on the surface of the smooth layer 2422 . The light shielding layer 2421 is located on the side of the light shielding film 242 facing the OLED screen 100 .

[0065] The driving mechanism 244 drives the shading film 242 to move along the surface of the light-transmitting plate 241. During this process, the smooth layer 2422 of the shading film 242 slides along the surface of the light-transmitting plate 241. The light-transmitting plate 241 flattens the shading film 242 and reduces the wear of the shading layer 2421 when it moves through the smooth layer 2422. The backlight of the OLED screen 100 can be flexibly adjusted through the movement of the shading film 242 to meet the needs of practical applications.

[0066] Embodiment three:

[0067] Based on the surface characteristics of the OLED screen 100 and the distribution position of the light shielding film 242 proposed by the present invention, another embodiment is proposed:

[0068] See also Fig. 9 , when the OLED screen 100 is concave.

[0069] The light-transmitting plate 241 is located between the OLED screen 100 and the light-shielding film 242 . The light-shielding layer 2421 is disposed on the surface of the smooth layer 2422 . The light-shielding layer 2421 is located on the side of the light-shielding film 242 away from the OLED screen 100 .

[0070] The driving mechanism 244 drives the shading film 242 to move along the surface of the light-transmitting plate 241. During this process, the smooth layer 2422 of the shading film 242 slides along the surface of the light-transmitting plate 241. The light-transmitting plate 241 flattens the shading film 242 and reduces the wear of the shading layer 2421 when it moves through the smooth layer 2422. The backlight of the OLED screen 100 can be flexibly adjusted through the movement of the shading film 242 to meet the needs of practical applications.

[0071] Embodiment 4:

[0072] Based on the surface characteristics of the OLED screen 100 and the distribution position of the light shielding film 242 proposed by the present invention, another embodiment is proposed:

[0073] See also Fig.10 , when the OLED screen 100 is wavy.

[0074] The light shielding film 242 is located between the OLED screen 100 and the light-transmitting plate 241 , and the light shielding layer 2421 is disposed inside the smooth layer 2422 .

[0075] The driving mechanism 244 drives the shading film 242 to move along the surface of the light-transmitting plate 241. During this process, the smooth layer 2422 of the shading film 242 slides along the surface of the light-transmitting plate 241. The light-transmitting plate 241 flattens the shading film 242, and reduces the wear of the shading layer 2421 during movement through the smooth layer 2422. At the same time, the smooth layers 2422 distributed on both sides of the shading film 242 can effectively prevent the shading layer 2421 from being scratched during movement, thereby preventing the shading particles from falling off, thereby ensuring the integrity of the shading film 242. The backlight of the OLED screen 100 can be flexibly adjusted through the movement of the shading film 242 to meet the needs of practical applications.

[0076] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

Claims

1. A backlight mechanism based on a transmissive OLED, characterized in that: It comprises an OLED screen (100) and a backlight assembly (200), wherein the backlight assembly (200) is arranged on a side surface of the OLED screen (100); The OLED screen (100) further comprises a plurality of first light detection modules (110); The backlight assembly (200) comprises a plurality of dimming mechanisms (240), each of the dimming mechanisms (240) being composed of a light shielding film (242), a plurality of winding rollers (243) and a plurality of driving mechanisms (244), the two ends of the light shielding film (242) being respectively connected to the surface of the winding roller (243), the plurality of driving mechanisms (244) driving the winding roller (243) to rotate, and the moving directions of the light shielding films (242) in adjacent dimming mechanisms (240) being opposite; Each of the light-shielding films (242) is composed of a light-shielding layer (2421) and a smooth layer (2422); the light-shielding layer (2421) is composed of a plurality of light-shielding particles, and the distribution density of the light-shielding particles on the light-shielding layer (2421) increases in a step-like manner along the length of the light-shielding film (242); the directions in which the density of the light-shielding particles on the surfaces of adjacent light-shielding films (242) increases are opposite; A plurality of second light detection modules (210) and a plurality of third light detection modules (230) are respectively arranged on both sides of the interior of the backlight assembly (200).

2. The backlight mechanism based on a transmissive OLED according to claim 1, characterized in that: The light shielding layer (2421) is disposed on the surface of the smooth layer (2422).

3. The backlight mechanism based on a transmissive OLED according to claim 1, characterized in that: The light shielding layer (2421) is arranged inside the smooth layer (2422).

4. The backlight mechanism based on a transmissive OLED according to claim 1, characterized in that: A plurality of the first light detection modules (110) are installed on the surface of the OLED screen (100), and the plurality of the first light detection modules (110) are located between the OLED screen (100) and the dimming mechanism (240).

5. The backlight mechanism based on a transmissive OLED according to claim 1, characterized in that: Each of the dimming mechanisms (240) further comprises a light-transmitting plate (241), and a surface of each of the light-transmitting plates (241) is distributed in parallel with a surface of the OLED screen (100).

6. The backlight mechanism based on a transmissive OLED according to claim 5, characterized in that: The surface of the light-transmitting plate (241) is slidably fitted to the surface of the smooth layer (2422).

7. The backlight mechanism based on a transmissive OLED according to claim 1, characterized in that: Both ends of the winding roller (243) are respectively engaged with the output ends of the driving mechanism (244).

8. The backlight mechanism based on a transmissive OLED according to claim 1, characterized in that: A power supply module (220) is disposed inside the backlight assembly (200), and the power supply module (220) is electrically connected to the OLED screen (100) and a plurality of driving mechanisms (244) respectively.

9. The backlight mechanism based on a transmissive OLED according to claim 1, characterized in that: The backlight assembly (200) further includes a control unit (250); The control unit (250) is electrically connected to the OLED screen (100), a plurality of first light detection modules (110), a plurality of second light detection modules (210), a plurality of third light detection modules (230), and a plurality of driving mechanisms (244), respectively.

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