Display device with active red light function and application thereof

Abstract

The invention discloses a display device with an active red light function and application thereof, and belongs to the technical field of display. Comprising a backlight unit; the backlight unit comprises a light guide plate and a light source; the light source comprises a red light source and a blue light source; the light source is located on the lower side of the diffusion plate or located on at least one side of the periphery of the light guide plate. A quantum dot yellow film, a first prism film, a second prism film, a DBEF brightness enhancement film, a diffusion film and a liquid crystal panel are sequentially arranged on the upper side of the diffusion plate or the light guide plate from bottom to top in a stacked mode. When the display device is applied, the white light mode is used for conventional use, the quantum dot yellow film is used for converting blue LED backlight, high-purity green light and eye protection red light with the long wavelength of 650 nm are emitted, the blue light content in the display device can be remarkably reduced, the display color gamut can be improved, and the eye use comfort degree can be improved. In the red light mode, the display device is used for emitting high-intensity long-wavelength 650nm eye protection red light, so that the beneficial effects of preventing and controlling myopia and protecting eye health are achieved.

Description

Technical Field

[0001] The present application relates to a display device with an active red light function and an application thereof, belonging to the field of display technology. Background Art

[0002] With the popularity of portable electronic products and the lack of outdoor activities, excessive use of the eyes has become an increasingly serious problem. On September 12, 2023, according to the latest data released by the National Health Commission, the overall myopia rate among children and adolescents in my country is 52.7%, and it is showing a trend of younger age. In addition to increasing the inconvenience of personal life, myopia will also affect career choices, so preventing myopia or slowing down the deterioration of myopia is urgent. Adolescence is a critical period for the growth and development of the eyes. During this stage, as the eyeball grows, the refractive power of the eye gradually develops from hyperopia to emmetropia. If this process is advanced due to excessive use of electronic screens, it will cause very serious myopia symptoms. Studies have shown that increasing the time spent on outdoor activities has been confirmed as a way to prevent the occurrence of myopia, and to delay the development of myopia after it occurs. The reason for this is that analysis shows that high-intensity light outdoors is an important reason for inhibiting myopia. [1] . On this basis, the researchers specifically compared the effects of strong light environments of different wavelengths on the development of myopia. In animal experiments on rhesus monkeys, the red light environment showed a more obvious effect in delaying vitreous elongation. In clinical medical control experiments, adolescents and preschool children treated with long-wavelength red light with a wavelength of 650nm and an intensity of 1600lux showed more obvious myopia delay compared with the control group. The above medical and animal experiments have demonstrated the value of red light irradiation in treating myopia or delaying the progression of myopia. In recent years, a low-intensity, long-wavelength red light irradiation myopia and amblyopia comprehensive treatment device (commonly known as a light feeding device) has been approved for marketing, which is the best proof of the value of this method. However, this special light therapy device has many inconveniences in use and carrying. If the electronic devices currently widely used on the market can be coupled with the light therapy device, it will undoubtedly greatly increase the popularity and frequency of use of the light therapy device.

[0003] Existing liquid crystal products can emit red light by means of liquid crystal deflection plus red light filter film. The disadvantages of this method are: 1. The backlight cannot reach the intensity of light therapy after being absorbed and reflected by the liquid crystal and the filter film. If high-intensity red light emission is achieved simply by increasing the power of the lamp beads, on the one hand, it will shorten the life of the equipment, and on the other hand, it will increase power consumption and heat and affect the battery life of the equipment; 2. The filtering of the filter film cannot obtain purer red light, which affects the effect of light therapy. Summary of the invention

[0004] In order to solve the problems of insufficient red light emission intensity and purity, shortened equipment life and high energy consumption in the combination of electronic device display and red light therapy in the prior art, the present application provides a display device with active red light function and its application, which adopts a direct-down or side-entry backlight structure combining dual-color backlight beads and quantum dot light conversion film.

[0005] This application adopts the following technical solutions:

[0006] A display device with active red light function, comprising a backlight unit;

[0007] The backlight unit includes an optical plate body and a light source;

[0008] The optical plate body is a light guide plate or a diffusion plate;

[0009] The light source comprises at least one red light source and at least one blue light source;

[0010] The light source is located at the lower side of the optical plate body or at least one side around the light guide plate;

[0011] A reflective film is disposed on the lower side of the optical plate body;

[0012] A quantum dot yellow film, a brightness enhancement film, a diffusion film, and a liquid crystal panel are sequentially stacked on the upper side of the optical plate body from bottom to top.

[0013] Optionally, when the light source is located at the lower side of the optical plate body, the optical plate body is a diffusion plate, and the light source is a direct-type light source;

[0014] A plurality of red light sources and blue light sources are alternately arranged in an array to form a light source array.

[0015] Optionally, the direct-down light source is selected from LED;

[0016] The red light source is selected from a red light LED, and the blue light source is selected from a blue light LED;

[0017] A plurality of red LEDs and blue LEDs are alternately arranged in an array to form an LED array.

[0018] Optionally, the ratio of the number of red LEDs to the number of blue LEDs is 1:0.01-100.

[0019] Optionally, when the light source is located on at least one side around the optical plate body, the optical plate body is a light guide plate, and the light source is an edge-entry light source;

[0020] The red light source and / or the blue light source is arranged along the side of the light guide plate to form a light bar.

[0021] Optionally, one side of the light source located around the light guide plate is a blue light bar, and at least one side of the other three sides is a red light bar.

[0022] Optionally, the light bar is a red-blue mixed light bar formed by alternating red light sources and blue light sources;

[0023] At least one side of the light source located around the light guide plate is a red and blue mixed light bar.

[0024] Optionally, the red light source is selected from red light LEDs, and the blue light source is selected from blue light LEDs.

[0025] Optionally, the ratio of the number of red LEDs to the number of blue LEDs is 1:0.01-100.

[0026] The brightness enhancement film is a DBEF brightness enhancement film and / or at least one layer of prism film.

[0027] In this application, there is no strict limitation on specific devices and materials, and those skilled in the art can select LED, light bar, optical plate body, quantum dot yellow film, diffusion film, prism film, and liquid crystal panel according to the existing technology. Among them, nanocomposites based on quantum dots such as CdSe and CdZnSe can also be composite materials based on perovskite quantum dots, and composite materials based on InP or other fluorescent conversion materials can also be used; the red LED can be selected from red GaAs LED, and the blue LED can be selected from blue GaN LED.

[0028] Optionally, the wavelength of the red light source is 640-660 nm.

[0029] Optionally, the quantum dot yellow film contains a red quantum dot luminescent material, and the luminescent peak of the red quantum dot luminescent material is 640-660 nm.

[0030] According to another aspect of the present application, there is provided an application of the above-mentioned display device with active red light function as a screen display device in a tablet computer, a learning machine, a display, and a notebook computer.

[0031] Optionally, the light emitting mode includes a switchable red light mode and a white light mode;

[0032] In red light mode, the red light source is turned on and the blue light source is turned off;

[0033] In white light mode, the red light source is turned on and the blue light source is turned on.

[0034] In actual application, after using the conventional white light mode for a period of time (for example, 45min / 60min), switch to the red light mode and observe the eyes for 2-3min for red light eye protection to achieve the effect of relieving eye fatigue, inhibiting dry eyes, preventing myopia, and protecting eye health. The red light mode can be used 2-3 times a day.

[0035] The beneficial effects of this application include:

[0036] The display device with active red light function provided by the present application has highly integrated white light and red light backlight modules, which enhances the portability and ease of use of the device. The narrow light emission characteristics of perovskite quantum dots are utilized in the white light mode to convert part of the blue light in the blue backlight source into pure green light and 650nm long-wavelength eye-protecting red light, which is conducive to improving the display color gamut of the screen, improving eye comfort, and alleviating the fatigue effect of long-term eye use. In addition, the use of perovskite yellow film can improve the color quality of the screen and increase eye comfort.

[0037] In the red light mode, 650nm long-wavelength red light is used for phototherapy. The display device with active red light function provided by the present application can emit a large area, which can solve the problem of low intensity and low energy efficiency when the traditional liquid crystal displays red light; high-intensity long-wavelength red light penetrates into the eye cell tissue, promotes the activity of retinal mitochondria, increases eye blood flow, improves iris hypoxia and other conditions, increases the thickness and blood supply of the choroid, enhances the elasticity of the iris, and allows more nutrients and oxygen to be supplied to the eye tissue, thereby promoting the retina to secrete more dopamine, which has the effect of moisturizing the eyes, and at the same time relieves symptoms such as dry eyes and eye fatigue caused by poor blood circulation; in addition, when high-intensity long-wavelength red light is irradiated on the skin, it can increase the activity of skin cells, anti-spot beauty, and can also promote the glucose metabolism of cells, which can effectively secrete melatonin, which is beneficial to the stability of biological rhythms and the enhancement of human vitality. It can also solve the high price and low integration of traditional phototherapy equipment, and improve ease of use, which is conducive to the promotion of equipment. In white light mode, you can turn on the red light bar to increase the red light component in the backlight, which can better protect the health of the eyes and provide an additional means for color temperature adjustment.

[0038] The display device with active red light function provided in this application is expected to be applied to learning flat panel display and the prevention and treatment of myopia. The display device with active red light function is applied to learning machine products in daily use, which can improve students' eye comfort and relieve eye fatigue. At the same time, the light treatment effect of the red light mode can effectively prevent and alleviate the development of myopia. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 This is a schematic structural diagram of a display device with active red light function in which the light source of the present application is an edge-type light source.

[0040] Figure 2 This application discloses a side-entry light source comprising four monochromatic light strips.

[0041] Figure 3 This application is a side-entry light source containing two monochromatic light strips.

[0042] Figure 4 This application is a side-entry light source containing one red and blue mixed light bar.

[0043] Figure 5 This application is a side-entry light source containing two red and blue mixed light strips.

[0044] Figure 6 This application is a side-entry light source containing 4 red and blue mixed light strips.

[0045] Figure 7 This is a schematic diagram of the distribution of reflective points of a light guide plate in a display device with active red light function of an edge-type light source of the present application.

[0046] Figure 8 This is a schematic structural diagram of a display device with active red light function in which the light source of the present application is a direct-type light source.

[0047] Fig. 9 This is a schematic diagram of the LED matrix arrangement in which the light source of this application is a direct-type light source.

[0048] Fig.10 The spectral curve of the edge-type light source of this application is a blue LED light bar.

[0049] Fig.11 The spectral curve of the edge-type light source of this application is a red LED light bar.

[0050] Fig.12 The light spectrum of the display device with active red light function in the white light mode is shown in FIG. 1 when the light source of the present application is an edge-type light source.

[0051] Fig.13 This is the planar NTSC color gamut range of a display device with active red light function when the light source of the present application is an edge-type light source.

[0052] Fig.14 This is the light spectrum of the display device with active red light function in the red light mode when the light source of the present application is an edge-type light source.

[0053] Fig.15 This is a schematic diagram of the LED matrix arrangement of the direct-type light source of this application (four LEDs form one matrix point)

[0054] Fig.16 The spectral curve of the direct-type light source of this application is a blue LED light bar.

[0055] Fig.17The spectral curve of the direct-type light source of this application is a red LED light bar.

[0056] Fig.18 This is the light spectrum of the display device with active red light function in the white light mode when the light source of the present application is a direct-lit light source.

[0057] Fig.19 This is the planar NTSC color gamut range of a display device with active red light function when the light source of the present application is a direct-lit light source.

[0058] Fig. 20 This is the light spectrum of the display device with active red light function in the red light mode when the light source of the present application is a direct-type light source.

[0059] Figure ID

[0060] 1. Reflective film; 2. Optical plate body; 31. First blue light bar; 32. First red light bar; 33. Second red light bar; 34. Third red light bar; 35. First red and blue mixed light bar; 36. Second red and blue mixed light bar; 37. Third red and blue mixed light bar; 38. Fourth red and blue mixed light bar; 39. LED array; 391. Red light LED; 392. Blue light LED; 4. Quantum dot yellow film; 5. First prism film; 6. Second prism film; 7. Diffusion film; 8. Brightness enhancement film; 9. Liquid crystal panel. DETAILED DESCRIPTION

[0061] The present application is described in detail below with reference to embodiments, but the present application is not limited to these embodiments.

[0062] Unless otherwise specified, the raw materials in the examples of this application were purchased through commercial channels.

[0063] Unless otherwise specified, conventional methods were used for testing and instrument settings were those recommended by the manufacturer.

[0064] The quantum dot yellow film used in the embodiments of the present application is derived from the patent with publication number CN114437710A, and the concentrated red light wavelength is 640-660nm.

[0065] Embodiment 1 A display device with an active red light function in which the light source is an edge-type light source

[0066] The structure of the display device with active red light function is as follows Figure 1 As shown, it includes a backlight unit;

[0067] The backlight unit includes an optical plate body and a light source;

[0068] The optical plate body is a light guide plate;

[0069] A reflective film is provided on the lower side of the light guide plate;

[0070] The light source comprises a red light source and a blue light source;

[0071] like Figure 2 As shown, the light source is located on each side of the light guide plate, wherein one side is a red light bar as a red light source, and the other three sides are blue light bars as blue light sources, arranged along the side of the light guide plate;

[0072] GaN is used as the blue light LED chip, GaAs is used as the red light LED chip, the red light source is selected from the red light GaAs LED light bar, and the peak wavelength of the light emission is 650nm; the blue light source is selected from the blue light GaN LED light bar, and the peak wavelength of the light emission is 650nm.

[0073] The upper side of the light guide plate is stacked with a quantum dot yellow film, a first prism film, a second prism film, a brightness enhancement film (DBEF brightness enhancement film), a diffusion film, and a liquid crystal panel in sequence from bottom to top.

[0074] Considering the white light mode and the red light mode, the schematic diagram of the distribution of the reflection points of the light guide plate in the display device with active red light function of the edge-entry light source is as follows: Figure 7 As shown; the spectrum curve of the side-entry light source is a blue LED light bar as shown Fig.10 As shown, the blue light peak is located at 450nm; the spectral curve of the side-entry light source is a red LED light bar as shown Fig.11 As shown in the figure, the red light peak is at 653nm, and the half-peak width is 19nm, which belongs to the long-wavelength eye-protecting red light. The display device with active red light function is in white light mode, and the screen power in white light mode is 13.5W. The luminous spectrum is as follows Fig.12 As shown, the peak position of the red fluorescence peak is also located at 650nm, which belongs to the long-wavelength eye-protecting red light; the average brightness of the white light mode is 312nit, and the nine-point test results of the screen brightness are shown in Table 1. The screen uniformity exceeds 80%, and the flat NTSC color gamut range of the display device with active red light function is as shown in Fig.13 As shown in Table 2, the NTSC color gamut coverage of the screen exceeds 110%; the display device with active red light function is in red light mode, the screen power in red light mode is 28.7W, the average brightness in red light mode is 350nit, the illuminance in front of the screen is 450lux, and the nine-point test results of the screen brightness are shown in Table 2. The screen uniformity exceeds 60%, and the luminous spectrum of the display device with active red light function in red light mode is shown in Table 2. Fig.14 shown.

[0075] Table 1 Nine-point test results of screen brightness in white light mode

[0076] 334nit 348nit 371nit 313nit 339nit 361nit 321nit 348nit 387nit

[0077] Table 2 Nine-point test results of screen brightness in red light mode

[0078] 450nit 376nit 465nit 358nit 290nit 351nit 291nit 281nit 287nit

[0079] Example 2

[0080] The structure of the display device with active red light function is the same as that of embodiment 1, except that the light source is arranged as follows: Figure 3 As shown, the light source is located on a pair of sides around the light guide plate, wherein one side is a red light bar as a red light source, and the other side is a blue light bar as a blue light source.

[0081] Example 3

[0082] The structure of the display device with active red light function is the same as that of embodiment 1, except that the light source is arranged as follows: Figure 4 As shown, the light source is located on one side around the light guide plate, wherein one side is a red and blue mixed light bar arranged along the side of the light guide plate, and the red and blue mixed light bar is formed by alternating red light sources and blue light sources, that is, red light GaAs LED and blue light GaN LED particles are alternately arranged.

[0083] Example 4

[0084] The structure of the display device with active red light function is the same as that of embodiment 3, except that the light source is arranged as follows: Figure 5 As shown, the light source is located on a pair of sides around the light guide plate, wherein the light source is arranged along the side of the light guide plate, and both sides are red and blue mixed light strips.

[0085] Example 5

[0086] The structure of the display device with active red light function is the same as that of embodiment 3, except that the light source is arranged as follows: Figure 6 As shown, the light source is located on each side around the light guide plate, wherein it is arranged along the side of the light guide plate, and each side is a red and blue mixed light strip.

[0087] Embodiment 6 Display device with active red light function in which the light source is a direct-down light source

[0088] The structure of the display device with active red light function is as follows Figure 8 As shown, a backlight unit is included;

[0089] The backlight unit includes an optical plate body and a light source;

[0090] The optical plate body is a diffusion plate;

[0091] The light source comprises a red light source and a blue light source;

[0092] The light source is located at the lower side of the diffusion plate;

[0093] The direct-down light source is selected from LED, GaN is used as a blue LED chip, GaAs is used as a red LED chip, the red light source is selected from a red LED, the blue light source is selected from a blue LED, and a plurality of red LEDs and blue LEDs are alternately arranged in an array to form an LED array, such as Fig. 9 As shown, the ratio of red LED to blue LED chips is 1:1;

[0094] The upper side of the diffusion plate is stacked with a quantum dot yellow film, a first prism film, a second prism film, a brightness enhancement film (DBEF brightness enhancement film), a diffusion film, and a liquid crystal panel in sequence from bottom to top.

[0095] The spectrum curve of the direct-down light source is a blue LED light bar. Fig.16 As shown, the blue light peak is located at 449nm, and the spectrum curve of the direct-down light source is a red LED light bar. Fig.17 As shown in Figure 1, the red light peak is located at 655nm, with a half-peak width of 19nm, which belongs to the long-wavelength eye-protecting red light. The luminous spectrum of the display device with active red light function in white light mode is shown in Figure 1. Fig.18 As shown, the peak position of the red fluorescence peak is also located at 650nm, which belongs to the long-wavelength eye-protecting red light. In the white light mode, the screen power of the white light mode is 20W, the average brightness is 450nit, and the nine-point test results of the screen brightness are shown in Table 3. The screen uniformity exceeds 94%, and the flat NTSC color gamut range of the display device with active red light function is as follows Fig.19 As shown, the screen NTSC color gamut coverage exceeds 111%; in red light mode, the luminous spectrum of the display device with active red light function is as follows Fig. 20 As shown, the screen power in red light mode is 48W, the average brightness in red light mode is 645nit, the illuminance in front of the screen is 830lux, and the nine-point test results of the screen brightness are shown in Table 4. The screen uniformity exceeds 93%.

[0096] Table 3 Nine-point test results of screen brightness in white light mode

[0097] 437nit 450nit 441nit 463nit 454nit 463nit 449nit 448nit 453nit

[0098] Table 4 Nine-point test results of screen brightness in red light mode

[0099] 628nit 633nit 624nit 666nit 663nit 661nit 660nit 645nit 632nit

[0100] Example 7

[0101] The structure of the display device with active red light function is the same as that of Example 6, except that the array arrangement of the LED is different: the direct-type light source is selected from LED, the red light source is selected from red LED, the blue light source is selected from blue LED, 3 blue LEDs and 1 red LED are arranged in a rectangular shape to form a light-emitting unit, and a plurality of light-emitting units are arranged in a rectangular array to form an LED array, and the ratio of the red LED to the blue LED chips is 1:3, such as Fig.15 shown.

[0102] The above are only a few embodiments of the present application and do not constitute any form of limitation to the present application. Although the present application is disclosed as above with preferred embodiments, it is not intended to limit the present application. Any technician familiar with the profession, without departing from the scope of the technical solution of the present application, using the technical content disclosed above to make slight changes or modifications are equivalent to equivalent implementation cases and fall within the scope of the technical solution.

Claims

1. A display device with active red light function, characterized in that: including a backlight unit; The backlight unit includes an optical plate body and a light source; The optical plate body is a light guide plate or a diffusion plate; The light source comprises at least one red light source and at least one blue light source; The light source is located at the lower side of the optical plate body or at least one side around the light guide plate; A reflective film is disposed on the lower side of the optical plate body; A quantum dot yellow film, a brightness enhancement film, a diffusion film, and a liquid crystal panel are sequentially stacked on the upper side of the optical plate body from bottom to top.

2. The display device with active red light function according to claim 1, characterized in that: When the light source is located at the lower side of the optical plate body, the optical plate body is a diffusion plate, and the light source is a direct-type light source; A plurality of red light sources and blue light sources are alternately arranged in an array to form a light source array.

3. The display device with active red light function according to claim 2, characterized in that: The direct-type light source is selected from LED; The red light source is selected from a red light LED, and the blue light source is selected from a blue light LED; A plurality of red LEDs and blue LEDs are alternately arranged in an array to form an LED array.

4. The display device with active red light function according to claim 1, characterized in that: When the light source is located on at least one side of the periphery of the optical plate body, the optical plate body is a light guide plate, and the light source is an edge-entry light source; The red light source and / or the blue light source is arranged along the side of the light guide plate to form a light bar.

5. The display device with active red light function according to claim 4, characterized in that: The light source is located on one side of the light guide plate as a blue light bar, and at least one of the other three sides is a red light bar.

6. The display device with active red light function according to claim 4, characterized in that: The light bar is a red-blue mixed light bar formed by alternating arrangement of red light sources and blue light sources; At least one side of the light source located around the light guide plate is a red and blue mixed light bar.

7. The display device with active red light function according to claim 4, characterized in that: The red light source is selected from red light LED, and the blue light source is selected from blue light LED.

8. The display device with active red light function according to claim 1, characterized in that: The brightness enhancement film is a DBEF brightness enhancement film and / or at least one layer of prism film.

9. Application of the display device with active red light function as claimed in any one of claims 1 to 8 as a screen display device in a tablet computer, a learning machine, a display, and a notebook computer.

10. The use according to claim 8, characterized in that: The light emitting modes include switchable red light mode and white light mode; In red light mode, the red light source is turned on and the blue light source is turned off; In white light mode, the red light source is turned on and the blue light source is turned on.

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