Backlight module, display device and display control method and device

Abstract

The invention provides a backlight module, a display device and a display control method and device.The backlight module comprises a plurality of light-emitting units; wherein each light emitting unit comprises at least two light source groups, and each light source group comprises a plurality of light sources; a plurality of lens units; the plurality of lens units and the plurality of light-emitting units are oppositely arranged; each lens unit corresponds to one light-emitting unit, and light emitted by each light source in the light-emitting unit can penetrate through the corresponding lens unit and is transmitted after being converged by the lens unit; wherein the light sources in each of the at least two light source groups are connected with the same switch control circuit, and the light sources in different light source groups are connected with different switch control circuits. The lens units converge and transmit light emitted by the light source groups in the corresponding light emitting units, and the transmitted light amplifies a picture on the screen through the naked eye 3D screen, so that a picture display area is wider, a larger viewing area is obtained, and meanwhile, a certain resolution ratio and a certain picture fineness degree are kept.

Description

Technical Field

[0001] The present invention relates to the field of 3D display technology, and in particular to a backlight module, a display device, and a display control method and device. Background Art

[0002] The current naked-eye 3D (three-dimensional digital technology) display devices mainly include technologies based on binocular parallax and technologies based on multi-eye parallax. In order to achieve a larger stereoscopic viewing area, some technical solutions use a combination of viewpoint tracking and binocular 3D technology. As the position of the observer's eyes is tracked, the pixel filling result of the stereoscopic image or the phase of the grating device is adjusted in real time to achieve a larger viewing area, but this method can only support a single user at present. Another way is to add more viewpoint images, but as the number of images increases, the resolution will decrease exponentially when the number of pixels on the screen is constant. At the same time, more images require grating devices with larger unit widths, which will also make the picture rougher. The third method is based on multi-eye 3D display technology, but does not add more viewpoint images. Instead, it makes the grating device closer to the pixel plane, such as Figure 1A and Figure 1B As shown, the width of the assumed viewing area is W, the width of the pixel combination corresponding to the grating unit (lens or parallax barrier) is w, the distance between the grating device and the pixel plane is d, and the distance between the grating device and the optimal viewing position is D. It is assumed that the refractive index of the medium between the grating device and the pixel plane is equal to the refractive index of the medium between the grating device and the optimal viewing position. Under this premise, the relationship between the width W of the 3D viewing area and the distance d between the grating device and the pixel plane conforms to the formula: W = (D*w) / d. It is found through the above formula that when D and w are constant, if d is smaller, W will be larger. However, this method is limited by the thickness of the glass, optical film, optical glue layer, etc. attached to the pixel plane of the display screen (LCD (Liquid Crystal Display, Liquid Crystal Display) / OLED (Organic Light-Emitting Diode, Organic Light Emitting Diode) / LED (Light Emitting Diode, Light Emitting Diode) or other display screens with a periodic array structure) and cannot arbitrarily reduce the distance d from the grating device to the pixel plane, so a larger viewing area cannot be obtained. Summary of the invention

[0003] The purpose of the present invention is to provide a backlight module, a display device, a display control method and a device, which are used to solve the problem in the prior art that naked-eye 3D display technology cannot obtain a larger viewing area while ensuring a certain resolution and picture fineness.

[0004] In order to solve the above technical problems, an embodiment of the present invention provides a backlight module, which includes:

[0005] A plurality of light-emitting units; wherein each of the light-emitting units comprises at least two light source groups, and each of the light source groups comprises a plurality of light sources;

[0006] A plurality of lens units; the plurality of lens units are arranged opposite to the plurality of light-emitting units; each of the lens units corresponds to one of the light-emitting units, and the light emitted by each of the light sources in the light-emitting units can pass through the corresponding lens unit and be converged and transmitted after being transmitted by the lens unit;

[0007] The light sources in each of the at least two light source groups are connected to the same switch control circuit, and the light sources in different light source groups are connected to different switch control circuits.

[0008] Optionally, in the backlight module, a vertical distance between the lens unit and the light-emitting unit is equal to a focal length of the lens unit.

[0009] Optionally, in the backlight module, in each of the light source groups, a plurality of the light sources are arranged in sequence along a first direction.

[0010] Optionally, in the backlight module, the lens unit is a cylindrical lens.

[0011] Optionally, in the backlight module, the light source includes at least one of the following:

[0012] Light emitting diode LED;

[0013] Organic light-emitting diode OLED;

[0014] MicroLED;

[0015] Quantum dot light emitting diode QLED.

[0016] In order to achieve the above object, the present invention provides a display device, including a display module, wherein the backlight module as described above is also included;

[0017] The display module and the backlight module are arranged opposite to each other, and the light emitted by the plurality of light sources in the backlight module can be transmitted through the display module.

[0018] Optionally, in the display device, the display module includes a liquid crystal display (LCD) panel and a grating; the grating is located on a side of the LCD panel away from the backlight module.

[0019] In order to achieve the above object, the present invention provides a display control method applied to the display device as described above, wherein the method comprises:

[0020] Sending a first control signal to the backlight module and a second control signal to the display module at a first moment, so that the backlight module controls the light sources in a first light source group in the corresponding light source groups to emit light through a switch control circuit according to the first control signal, and the display module controls a first part of display pixels of the display module to output a first frame image of a 3D picture to be displayed according to the second control signal;

[0021] At the second moment, a third control signal is sent to the backlight module and a fourth control signal is sent to the display module, so that the backlight module controls the light sources in the second light source group in the corresponding light source group to emit light through a switch control circuit according to the third control signal, and the display module controls the second part of the display pixels of the display module to output the second frame image of the 3D picture to be displayed according to the fourth control signal.

[0022] Optionally, in the display control method, when the number of the light source groups is more than two, the method further comprises:

[0023] At a third moment, a fifth control signal is sent to the backlight module and a sixth control signal is sent to the display module, so that the backlight module controls the light sources in the third light source group in the corresponding light source groups to emit light through a switch control circuit according to the fifth control signal, and the display module controls the third part of the display pixels of the display module to output the third frame image of the 3D picture to be displayed according to the sixth control signal.

[0024] In order to achieve the above object, the present invention provides a display control device applied to the above display device, wherein the device comprises:

[0025] a first sending module, configured to send a first control signal to the backlight module and a second control signal to the display module at a first moment, so that the backlight module controls the light sources in a first light source group in the corresponding light source groups to emit light through a switch control circuit according to the first control signal, and the display module controls a first part of display pixels of the display module to output a first frame image of a 3D picture to be displayed according to the second control signal;

[0026] The second sending module is used to send a third control signal to the backlight module and a fourth control signal to the display module at a second moment, so that the backlight module controls the light sources in the second light source group in the corresponding light source group to emit light through a switch control circuit according to the third control signal, and the display module controls the second part of the display pixels of the display module to output the second frame image of the 3D picture to be displayed according to the fourth control signal.

[0027] The beneficial effects of the above technical solution of the present invention are as follows:

[0028] In the above scheme, the lens units correspond to the light-emitting units one by one, each light-emitting unit includes at least two light source groups, the multiple light sources in each light source group are controlled by the same switch, and different light source groups are controlled by different switches. The lens unit converges and transmits the light emitted by the light source group in the corresponding light-emitting unit. The transmitted light passes through the naked-eye 3D screen to enlarge the picture on the screen, making the picture display area wider, thereby obtaining a larger viewing area, while maintaining a certain resolution and picture fineness. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1A This is one of the schematic diagrams of the relationship between the distance from the grating device to the pixel plane and the width of the viewing area in the prior art;

[0030] Figure 1B The second schematic diagram of the relationship between the distance from the grating device to the pixel plane and the width of the viewing area in the prior art;

[0031] Figure 2 This is one of the schematic diagrams of the backlight module according to the embodiment of the present invention;

[0032] Figure 3 This is a second schematic diagram of the backlight module according to an embodiment of the present invention;

[0033] Figure 4A This is one of the schematic diagrams of the lighting effect of the backlight module according to the embodiment of the present invention;

[0034] Figure 4B This is a second schematic diagram of the lighting effect of the backlight module according to an embodiment of the present invention;

[0035] Figure 4C This is a third schematic diagram of the lighting effect of the backlight module according to an embodiment of the present invention;

[0036] Figure 5 is a schematic diagram of a display device according to an embodiment of the present invention;

[0037] Fig. 6A This is one of the schematic diagrams of the light emitting effect of the display device according to the embodiment of the present invention;

[0038] Figure 6B This is a second schematic diagram of the light emitting effect of the display device according to an embodiment of the present invention;

[0039] Figure 6C This is a third schematic diagram of the light emitting effect of the display device according to an embodiment of the present invention;

[0040] Figure 7 A schematic diagram of a display control method for a display device according to an embodiment of the present invention;

[0041] Figure 8 A schematic diagram of a display control device of a display device according to an embodiment of the present invention.

[0042] Explanation of symbols:

[0043] 10-light-emitting unit; 11-light source group; 20-lens unit; 30-LCD panel; 40-grating. DETAILED DESCRIPTION

[0044] 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.

[0045] The present invention aims to solve the problem that the naked-eye 3D display technology in the prior art cannot obtain a larger viewing area while ensuring a certain resolution and picture fineness, and provides a backlight module, a display device, a display control method and a device.

[0046] like Figure 2 As shown, an embodiment of the present invention provides a backlight module, which includes:

[0047] A plurality of light-emitting units 10; wherein each of the light-emitting units 10 comprises at least two light source groups 11, and each of the light source groups 11 comprises a plurality of light sources;

[0048] A plurality of lens units 20; the plurality of lens units 20 are arranged opposite to the plurality of light-emitting units 10; each of the lens units 20 corresponds to one of the light-emitting units 10, and the light emitted by each of the light sources in the light-emitting units 10 can pass through the corresponding lens unit 20, and is converged by the lens unit 20 and then transmitted;

[0049] The light sources in each light source group 11 of the at least two light source groups 11 are connected to the same switch control circuit, and the light sources in different light source groups 11 are connected to different switch control circuits.

[0050] In this embodiment, the lens unit 20 corresponds one-to-one to the light emitting unit 10, and the light emitting unit 10 includes at least two light source groups 11. The multiple light sources in each light source group 11 are controlled by the same switch, and different light source groups 11 are controlled by different switches. The lens unit 20 converges and transmits the light emitted by the light source group 11 in the corresponding light emitting unit 10. The transmitted light passes through the naked-eye 3D screen to enlarge the picture on the screen, making the picture display area wider, thereby obtaining a larger viewing area, while maintaining a certain resolution and picture fineness.

[0051] Optionally, in the backlight module, a vertical distance between the lens unit 20 and the light emitting unit 10 is equal to a focal length of the lens unit 20 .

[0052] In this embodiment, Figure 2 In the example, each of the light-emitting units 10 includes three light source groups 11. When talking about switching a certain Li, unless otherwise specified, it means simultaneously switching a column of light sources in the vertical direction, that is, a light source group 11. The distance d between the lens unit 20 and the light source surface of the light-emitting unit 10 is the focal length f of the lens unit 20. The light sources in the plurality of light-emitting units 10 are evenly divided into several groups in the horizontal direction to form a plurality of light-emitting units 10. Each of the light-emitting units 10 includes the same number of columns of light sources, that is, each of the light-emitting units 10 includes the same number of light source groups 11, and the width of the light-emitting unit 10 in the horizontal direction is s. Assuming that we want the viewer's best viewing position to be at a distance D from the lens unit 20, the calculation formula for the width W of the lens unit 20 is as follows:

[0053]

[0054] like Figure 3 As shown, optionally, in the backlight module, in each of the light source groups 11, a plurality of the light sources are arranged in sequence along a first direction.

[0055] In this embodiment, Figure 3 It can be seen that the light sources in the light source group 11 are arranged in the vertical direction.

[0056] Optionally, in the backlight module, the lens unit 20 is a cylindrical lens.

[0057] In this embodiment, each of the light-emitting units 10 corresponds to a lens unit 20, each lens unit 20 is a cylindrical lens with a cross-section identical to that of a convex lens, the focal line direction of the lens unit 20 is vertically arranged, and the arrangement of the light sources in the light source group 11 is identical to the focal line arrangement direction of the lens unit 20.

[0058] It should be noted that the lens unit 20 and the light emitting unit 10 are glued together by optical glue, and other transparent media may also be used according to actual needs.

[0059] Optionally, in the backlight module, the light source includes at least one of the following:

[0060] Light emitting diode LED;

[0061] Organic light-emitting diode OLED;

[0062] MicroLED;

[0063] Quantum dot light emitting diode QLED.

[0064] In this embodiment, the light source can be realized by using different technologies such as LED, OLED, MicroLED (Micro Light Emitting Diode Display), QLED (Quantum Dot Light Emitting Diode), etc.

[0065] like Figure 5 As shown, in order to achieve the above-mentioned purpose, the present invention provides a display device, including a display module, wherein the backlight module as described above is also included;

[0066] The display module and the backlight module are arranged opposite to each other, and the light emitted by the plurality of light sources in the backlight module can be transmitted through the display module.

[0067] Optionally, in the display device, the display module includes a liquid crystal display (LCD) panel 30 and a grating 40; the grating 40 is located on a side of the LCD panel 30 away from the backlight module.

[0068] In this embodiment, the light of the backlight module is used as the backlight of the LCD panel 30, and combined with the grating 40, a naked-eye 3D display effect with greater visual effect can be formed. The grating 40 here includes a 3D parallax barrier grating 40 and a 3D light guide lens grating 40. Transparent media such as air, glue and glass can be filled between each layer.

[0069] like FIG. 4A to FIG. 4C , FIG. 6A to FIG. 6C and Figure 7 As shown, in order to achieve the above object, the present invention provides a display control method applied to the display device as described above, wherein the method comprises:

[0070] S10, sending a first control signal to the backlight module and a second control signal to the display module at a first moment, so that the backlight module controls the light sources in the first light source group 11 of the corresponding light source groups 11 to emit light through a switch control circuit according to the first control signal, and the display module controls the first part of the display pixels of the display module to output a first frame image of the 3D picture to be displayed according to the second control signal;

[0071] S20, sending a third control signal to the backlight module and a fourth control signal to the display module at the second moment, so that the backlight module controls the light source in the corresponding second light source group 11 in the light source group 11 through a switch control circuit according to the third control signal to emit light, and the display module controls the second part of the display pixels of the display module to output the second frame image of the 3D picture to be displayed according to the fourth control signal.

[0072] Optionally, in the display control method, when the number of the light source groups 11 is more than two, the method further comprises:

[0073] At the third moment, a fifth control signal is sent to the backlight module and a sixth control signal is sent to the display module, so that the backlight module controls the light source in the third light source group 11 in the corresponding light source group 11 to emit light through a switch control circuit according to the fifth control signal, and the display module controls the third part of the display pixels of the display module to output the third frame image of the 3D picture to be displayed according to the sixth control signal.

[0074] In this embodiment, if Figure 4A As shown, at the first moment, the light sources in the first light source group 11 (L1) of each light emitting unit 10 are controlled to emit light, while the second light source group 11 (L2) and the third light source group 11 (L3) are not emitted, and the light emitted by the entire backlight module will be projected onto the first specific area. Figure 4B As shown, at the second moment, the light sources in the second light source group 11 (L2) are controlled to emit light, while the first light source group 11 (L1) and the third light source group 11 (L3) are not emitted, and the light emitted by the backlight module will be projected onto the second specific area. Figure 4C As shown, at the third moment, the light sources in the third light source group 11 (L3) are controlled to emit light, while the first light source group 11 (L1) and the second light source group 11 (L2) are not controlled to emit light, and the light emitted by the backlight module will be projected onto the third specific area.

[0075] Assume we have V0, V1, ..., V n-1For an image with N viewpoints in total, it is assumed that our light emitting unit 10 includes three light source groups 11. At the first moment, the second moment, and the third moment, the light of the light source can be distributed through the lens unit 20 to form three subspaces. Then at the first moment, we fill V0 to V( N / 3) -1 The specific filling method of the viewpoint image content is already a public technology in the industry and will not be repeated here. At the second moment, we fill V( N / 3 ) to V( 2N / 3) -1 At the third moment, we fill V( 2N / 3 ) to V n-1 In this way, a space consisting of V0, V1, ..., V n-1 The 3D viewing range is formed by a total of N viewpoint images, but the pixels on the LCD panel 30 are only used to express N / 3 viewpoint images at each moment, and multiple viewpoint images share pixels with fixed values ​​on the LCD panel 30, so the resolution of each viewpoint image is 3 times higher than the traditional resolution of N viewpoint images at the same time. By analogy, if the number of light source groups 11 included in the light-emitting unit 10 is larger, the more subspaces of directional distribution of light in the space are, and we can display fewer viewpoint images at each moment. This is equivalent to further improving the 3D resolution.

[0076] If it is necessary to achieve the effect of continuously switching images at different times without flickering, assuming that each of the light-emitting units 10 includes M light source groups 11, the frequency of switching the light source groups 11 must at least reach M*60Hz. For example, each of the light-emitting units 10 includes three light source groups 11, which requires at least 180Hz.

[0077] like FIG. 6A to FIG. 6B As shown in the figure, the optical path is simplified, and only a schematic diagram of the viewpoint image distribution area formed in space by the pixels on the LCD panel 30 through the grating 40 is drawn, but this does not affect the description of the principle of this embodiment, because the optical path of the grating 40 to directional project the light emitted by the LCD panel 30 is well known to those skilled in the art and will not be repeated. Fig. 6A As shown, at the first moment, the content of viewpoints 0, 1, and 2 is filled on the pixels of the LCD panel 30, and a projection area of ​​viewpoints 0, 1, and 2 is formed in the space pointing to the backlight projection area. The backlight cannot reach other areas, so these viewpoint images cannot be projected. Figure 6BAs shown, at the second moment, the content of viewpoints 3, 4, and 5 is filled on the pixels of the LCD panel 30, and a projection area of ​​viewpoints 3, 4, and 5 is formed in the space pointing to the backlight projection area. The backlight cannot reach other areas, so these viewpoint images cannot be projected. Figure 6C As shown, at the third moment, the contents of viewpoints 6, 7, and 8 are filled on the pixels of the LCD panel 30, forming a projection area of ​​viewpoints 6, 7, and 8 in space pointing to the backlight projection area, and the backlight cannot reach other areas, so these viewpoint images cannot be projected.

[0078] However, if the first moment, the second moment and the third moment are switched fast enough, we will form a continuous viewing range of 9 viewpoint images of viewpoints 0, 1, 2, 3, 4, 5, 6, 7, and 8, but only 3 viewpoint images are distributed on the LCD at each moment, so the resolution will be higher than when 9 viewpoint images are distributed on the LCD panel 30 at the same time. In addition, the size of the grating 40 is also reduced accordingly, which reduces the pixel granularity caused by optical magnification and improves the delicacy of the picture.

[0079] like Figure 8 As shown, in order to achieve the above object, the present invention provides a display control device applied to the above display device, wherein the device includes:

[0080] A first sending module 01 is used to send a first control signal to the backlight module and a second control signal to the display module at a first moment, so that the backlight module controls the light sources in the first light source group 11 in the corresponding light source groups 11 to emit light through a switch control circuit according to the first control signal, and the display module controls the first part of the display pixels of the display module to output the first frame image of the 3D picture to be displayed according to the second control signal;

[0081] The second sending module 02 is used to send a third control signal to the backlight module and a fourth control signal to the display module at a second moment, so that the backlight module controls the light source in the second light source group 11 in the corresponding light source group 11 through a switch control circuit to emit light according to the third control signal, and the display module controls the second part of the display pixels of the display module to output the second frame image of the 3D picture to be displayed according to the fourth control signal.

[0082] Optionally, in the display control device, when the number of the light source groups 11 is more than two, the device further comprises:

[0083] The third sending module is used to send a fifth control signal to the backlight module and a sixth control signal to the display module at a third moment, so that the backlight module controls the light source in the third light source group 11 in the corresponding light source group 11 through a switch control circuit to emit light according to the fifth control signal, and the display module controls the third part of the display pixels of the display module to output the third frame image of the 3D picture to be displayed according to the sixth control signal.

[0084] It should be noted here that the above-mentioned device provided in the embodiment of the present invention can implement all the method steps implemented in the above-mentioned method embodiment, and can achieve the same technical effect. The parts and beneficial effects that are the same as the method embodiment in this embodiment will not be described in detail here.

[0085] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A backlight module, characterized in that: include: A plurality of light-emitting units; wherein each of the light-emitting units comprises at least two light source groups, and each of the light source groups comprises a plurality of light sources; A plurality of lens units; the plurality of lens units are arranged opposite to the plurality of light-emitting units; each of the lens units corresponds to one of the light-emitting units, and the light emitted by each of the light sources in the light-emitting units can pass through the corresponding lens unit and be converged and transmitted after being transmitted by the lens unit; The light sources in each of the at least two light source groups are connected to the same switch control circuit, and the light sources in different light source groups are connected to different switch control circuits.

2. The backlight module according to claim 1, characterized in that: A vertical distance between the lens unit and the light emitting unit is equal to a focal length of the lens unit.

3. The backlight module according to claim 1, characterized in that: In each of the light source groups, a plurality of the light sources are arranged in sequence along a first direction.

4. The backlight module according to claim 1, characterized in that: The lens unit is a cylindrical lens.

5. The backlight module according to claim 1, characterized in that: The light source comprises at least one of the following: Light emitting diode LED; Organic light-emitting diode OLED; MicroLED; Quantum dot light emitting diode QLED.

6. A display device, comprising a display module, characterized in that: Also includes a backlight module as claimed in any one of claims 1 to 5; The display module and the backlight module are arranged opposite to each other, and the light emitted by the plurality of light sources in the backlight module can be transmitted through the display module.

7. The display device according to claim 6, characterized in that: The display module comprises a liquid crystal display (LCD) panel and a grating; the grating is located on a side of the LCD panel away from the backlight module.

8. A display control method applied to the display device according to claim 7, characterized in that: The method comprises: Sending a first control signal to the backlight module and a second control signal to the display module at a first moment, so that the backlight module controls the light sources in a first light source group in the corresponding light source groups to emit light through a switch control circuit according to the first control signal, and the display module controls a first part of display pixels of the display module to output a first frame image of a 3D picture to be displayed according to the second control signal; At the second moment, a third control signal is sent to the backlight module and a fourth control signal is sent to the display module, so that the backlight module controls the light sources in the second light source group in the corresponding light source group to emit light through a switch control circuit according to the third control signal, and the display module controls the second part of the display pixels of the display module to output the second frame image of the 3D picture to be displayed according to the fourth control signal.

9. The display control method according to claim 8, characterized in that: When the number of the light source groups is more than two, the method further includes: At a third moment, a fifth control signal is sent to the backlight module and a sixth control signal is sent to the display module, so that the backlight module controls the light sources in the third light source group in the corresponding light source groups to emit light through a switch control circuit according to the fifth control signal, and the display module controls the third part of the display pixels of the display module to output the third frame image of the 3D picture to be displayed according to the sixth control signal.

10. A display control device applied to the display device according to claim 7, characterized in that: The device comprises: a first sending module, configured to send a first control signal to the backlight module and a second control signal to the display module at a first moment, so that the backlight module controls the light sources in a first light source group in the corresponding light source groups to emit light through a switch control circuit according to the first control signal, and the display module controls a first part of display pixels of the display module to output a first frame image of a 3D picture to be displayed according to the second control signal; The second sending module is used to send a third control signal to the backlight module and a fourth control signal to the display module at a second moment, so that the backlight module controls the light sources in the second light source group in the corresponding light source group to emit light through a switch control circuit according to the third control signal, and the display module controls the second part of the display pixels of the display module to output the second frame image of the 3D picture to be displayed according to the fourth control signal.

Images