CN108828837B - Wide-narrow viewing angle switching display device - Google Patents
Wide-narrow viewing angle switching display device Download PDFInfo
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- CN108828837B CN108828837B CN201810549511.7A CN201810549511A CN108828837B CN 108828837 B CN108828837 B CN 108828837B CN 201810549511 A CN201810549511 A CN 201810549511A CN 108828837 B CN108828837 B CN 108828837B
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/1336—Illuminating devices
- G02F1/133602—Direct backlight
- G02F1/133603—Direct backlight with LEDs
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/1323—Arrangements for providing a switchable viewing angle
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/1336—Illuminating devices
- G02F1/133602—Direct backlight
- G02F1/133608—Direct backlight including particular frames or supporting means
Abstract
The application discloses display device is switched to wide and narrow visual angle includes: display panel and the backlight unit who is located the display panel back, backlight unit includes the backplate, a plurality of lamp strips that are located on the backplate, the diffuser plate that is located display panel below and the frame of gluing around display panel, a plurality of lamp strip evenly distributed are on the bottom surface of backplate, and the LED lamp in every lamp strip becomes predetermined angle setting each other, under first display mode, all LED lamps in every lamp strip are all opened, make the light that each lamp strip sent disperse to different directions, under second display mode, part LED lamp in every lamp strip is opened, make the light that each lamp strip sent assemble to the display panel center, the electric current that flows through every lamp strip under first display mode and the second display mode sets to make the luminous luminance of every lamp strip equal. The display mode is switched by controlling the number of the LED lamps to be turned on and off, the display brightness is controlled by controlling the current flowing through the LED lamps, and a good film watching effect is kept.
Description
Technical Field
The invention relates to the field of liquid crystal display, in particular to a direct type backlight wide and narrow viewing angle switching display device.
Background
In recent years, Liquid Crystal Displays (LCDs) have been widely used in consumer products for various information and communication devices because of their advantages such as small size, high image quality, no radiation, and low driving voltage.
Since the LCD panel itself in the LCD does not emit light, a backlight module is required to be disposed on the back side of the LCD panel as a backlight source to normally display images. With the rapid development of light source technology in backlight modules, Light Emitting Diodes (LEDs) are widely used due to their characteristics of low energy consumption, small size, long service life, low temperature rise, etc., and most of the currently used liquid crystal displays are in the form of LED backlight modules as the backlight sources of liquid crystal display devices. At present, two common backlight modes are provided, one mode is a direct type, LED lamp strips are distributed below the whole liquid crystal display panel, the luminance is high, the color gamut is wider, and the image effect is more natural; the other type is a side-in type, the LED lamp strips are only distributed on one side of the panel, the structure is simple, the machine body is thin, and the heat dissipation is fast.
No matter which backlight light emitting mode is adopted, the brightness, the contrast, the viewing field and other aspects of the liquid crystal display panel are improved, people hope to effectively protect business confidentiality and personal privacy while enjoying good visual experience brought by technical progress, and loss or embarrassment caused by screen information leakage is avoided. Many liquid crystal display panels in the market can realize wide and narrow visual angle switching, and in order to achieve the peep-proof effect in the NVA mode, the liquid crystal display panels are designed to leak light from the left side and the right side, so that the contrast in the left direction and the right direction is reduced, namely the whole picture of the liquid crystal display panel is seen from the side to be whitish, and the narrow visual angle peep-proof is realized. However, the left and right sides of the liquid crystal display panel leak light, which gives a feeling of glaring, and the liquid crystal display panel usually causes a phenomenon of flickering of a screen when the viewing angle is switched, and is inconvenient for good viewing.
Disclosure of Invention
In view of this, an object of the present invention is to provide a wide and narrow viewing angle switching display device with uniform brightness, which adjusts a backlight light-emitting angle by switching on and off of LED light bars at different angles, and controls the magnitude of current flowing through the LED light bars to make the brightness of the wide and narrow viewing angles consistent, thereby achieving a smooth switching effect of the wide and narrow viewing angles.
According to the present invention, there is provided a wide and narrow viewing angle switching display device including: the backlight module comprises a back plate, a plurality of light bars positioned on the back plate, a diffusion plate positioned below the display panel and a rubber frame surrounding the display panel, wherein the plurality of light bars are uniformly distributed on the bottom surface of the back plate, and the LED lamps in each light bar are arranged at a preset angle with each other, in the first display mode, all the LED lamps in each lamp strip are turned on, so that the light emitted by each lamp strip is diffused in different directions, in the second display mode, part of the LED lamps in each lamp strip are turned on, so that the light emitted by each lamp strip is converged towards the center of the display panel, the current flowing through each light bar in the first display mode and the second display mode is set to enable the light emitting brightness of each light bar to be equal.
Preferably, the plurality of light bars are arranged in parallel on the back plate at the same interval.
Preferably, the back panel includes a first area and a second area which are symmetrical to each other, each of the light bars includes a plurality of LED lamps inclined in a first direction and a plurality of LED lamps inclined in a second direction, the first direction and the second direction form the preset angle, in the second display mode, the plurality of LED lamps inclined in the first direction in each of the light bars in the first area are turned on, and the plurality of LED lamps inclined in the second direction in each of the light bars in the second area are turned on.
Preferably, the plurality of LED lamps inclined in the first direction in each light bar are turned on when receiving a first control current, and the plurality of LED lamps inclined in the second direction are turned on when receiving a second control current, where the first control current and the second control current are half of rated current in the first display mode, and the first control current and the second control current are rated current in the second display mode.
Preferably, each of the light bars includes: the bottom plate is arranged into a strip shape; and a plurality of mounting plates vertically mounted on the base plate and arranged in parallel with each other, each of the mounting plates having two surfaces inclined in the first direction and the second direction, respectively, each of the surfaces being provided with one LED lamp.
Preferably, each of the light bars includes: the bottom plate is arranged in a strip shape, and clamping grooves are formed in two sides of the bottom plate; the mounting plates are vertically arranged on the bottom plate and are arranged in parallel with each other, each mounting plate is V-shaped, the bottom of each mounting plate is arranged to be matched with the clamping groove, the mounting plates are mounted on the bottom plate through the clamping grooves, and one LED lamp is mounted on each of two inclined surfaces of the V-shape.
Preferably, the bottom surface of the back plate is wave-shaped, the section of the wave is trapezoid, and two inclined surfaces of the trapezoid form the preset angle with each other; each light bar comprises two sub light bars, and the two sub light bars are respectively arranged on the two corresponding trapezoidal inclined surfaces.
Preferably, each of the sub light bars includes: the bottom plate is arranged into a strip shape; a plurality of LED lamps mounted on the base plate and arranged in parallel with each other.
Preferably, the wavy structure of the back plate is formed by sheet metal stamping.
Preferably, the preset angle is in the range of 30 ° to 60 °.
Preferably, the first display mode is a wide viewing angle display mode, and the second display mode is a narrow viewing angle display mode.
The wide and narrow visual angle switching display device provided by the invention adopts direct type backlight, has higher brightness and bright and clear patterns, and adjusts the backlight light-emitting angle by switching the on and off of the LED lamp bars in different directions, thereby achieving the effect of wide and narrow visual angle switching. When the display visual angle is switched, the display brightness is controlled by controlling the intensity of current flowing through the lamp strip, the consistency of the screen brightness is kept when the visual angle is switched, the picture flicker is avoided, and the film watching effect is enhanced.
Drawings
The above and other objects, features and advantages of the present invention will become more apparent from the following description of the embodiments of the present invention with reference to the accompanying drawings.
Fig. 1 is a schematic view showing an external configuration of a wide and narrow viewing angle switching display device according to an embodiment of the present invention.
Fig. 2a shows a cross-sectional view of a wide-narrow viewing angle switching display device according to a first embodiment of the present invention along the line a-a' in fig. 1.
Fig. 2b is a perspective view illustrating a structure of a back panel and a light bar inside a wide and narrow viewing angle switching display device according to a first embodiment of the invention.
Fig. 3 is a schematic structural diagram illustrating a light bar of a wide-and-narrow-viewing-angle switching display device according to a first embodiment of the invention.
Fig. 4 is a schematic structural diagram illustrating a light bar of a wide-and-narrow-viewing-angle switching display device according to a second embodiment of the invention.
Fig. 5a and 5b are schematic diagrams illustrating an operation principle of the wide and narrow viewing angle switching display device according to the first embodiment of the present invention.
Fig. 6a is a perspective view illustrating a structure of a back panel and a light bar inside a wide and narrow viewing angle switching display device according to a third embodiment of the invention.
Fig. 6b shows a cross-sectional view of a wide-narrow viewing angle switching display device according to a third embodiment of the present invention along the line a-a' in fig. 1.
Fig. 7a and 7b are schematic diagrams illustrating an operation principle of a wide and narrow viewing angle switching display device according to a third embodiment of the present invention.
Detailed Description
The present invention will be described below based on examples, but the present invention is not limited to only these examples. In the following detailed description of the present invention, certain specific details are set forth. It will be apparent to one skilled in the art that the present invention may be practiced without these specific details. Well-known methods, procedures, components and circuits have not been described in detail so as not to obscure the present invention.
It is to be understood that the terms "first," "second," and the like in the description of the present invention are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. In addition, in the description of the present invention, "a plurality" means two or more unless otherwise specified. Unless the context clearly requires otherwise, throughout the description and the claims, the words "comprise", "comprising", and the like are to be construed in an inclusive sense as opposed to an exclusive or exhaustive sense; that is, what is meant is "including, but not limited to".
Fig. 1 is a schematic view showing an external configuration of a wide and narrow viewing angle switching display device according to an embodiment of the present invention.
As shown in fig. 1, the wide and narrow viewing angle switching display device of the present invention includes a display panel 110 and a backlight module 120 located at the back of the display panel 110. The backlight module 120 includes a back plate 130, and the back plate 130 is fixedly connected to the display panel 110 through a rubber frame 160. The light emitted from the backlight assembly 120 is emitted through the display panel 110, thereby presenting an image to a viewer.
Fig. 2a is a perspective view illustrating a structure of a back panel and a light bar inside a wide and narrow viewing angle switching display device according to a first embodiment of the invention; fig. 2b shows a cross-sectional view of the wide-and-narrow viewing angle switching display device according to the first embodiment of the present invention along the line a-a' in fig. 1.
As shown in fig. 2a, the backlight light-emitting manner of the wide-and-narrow-viewing angle switching display device of the present embodiment is a direct-type light-emitting manner, the back plate 130 is in a groove shape, a plurality of light bars 140 are disposed in the groove, the diffusion plate 150 is located below the display panel 110, and the plastic frame 160 is located between the diffusion plate 150 and the back plate 130 and surrounds the display panel 110. The plurality of light bars 140 are uniformly distributed on the bottom surface of the back plate 130 corresponding to the display area of the display panel 110, the LED lamps 141 in each light bar 140 are arranged at a preset angle, and the plurality of light bars 140 are arranged in parallel on the back plate 130 at the same interval.
The back panel 130 comprises a first area 131 and a second area 132 which are symmetrical, and the light bars 140 are uniformly distributed in the first area 131 and the second area 132 on the bottom surface of the back panel 130, that is, the number of the light bars 140 in the two areas is the same. As shown in fig. 2b, the longitudinal axis of the display panel 110 is taken as a central line, the left area includes a first area 131, the right area includes a second area 132, and the plurality of light bars 140 are arranged in parallel and in parallel at the same interval along the longitudinal direction of the display panel 110, and cover the bottom surface of the back plate 130.
Each light bar 140 includes a plurality of LED lamps 142 inclined in a first direction and a plurality of LED lamps 143 inclined in a second direction, and the first direction and the second direction form a predetermined angle. Referring to fig. 2b, in this embodiment, the light emitting directions of the LED lamps 142 inclined along the first direction are emitted obliquely to the right and upward direction, and the light emitting directions of the LED lamps 143 inclined along the second direction are emitted obliquely to the left and upward direction. The plurality of LED lamps 142 inclined in the first direction and the plurality of LED lamps 143 inclined in the second direction may be individually turned on and off.
The wide-narrow viewing angle switching display device of the present embodiment achieves the effect of switching the display modes by controlling the plurality of LED lamps 142 inclined in the first direction and the plurality of LED lamps 143 inclined in the second direction to be turned on and off under different conditions by the driving circuit. For example, the wide and narrow viewing angle switching display device of the present embodiment includes two display modes that are switchable. In the first display mode, all the LED lamps 141 in each light bar 140 are turned on, so that the light emitted by each light bar 140 is diffused in different directions; in the second display mode, a portion of the LED lamps 141 in each light bar 140 are turned on, so that light emitted from each light bar 140 is focused toward the center of the display panel 110. The currents flowing through each light bar 140 in the first display mode and the second display mode are set such that the light emitting brightness of each light bar 140 is equal. Preferably, the first display mode is a wide viewing angle display mode, and the second display mode is a narrow viewing angle display mode.
For example, in the wide viewing angle display mode, all the LED lamps 141 of all the light bars 140 in the first area 131 and the second area 132 may be turned on, so that the light emitted from each light bar 140 is dispersed, and in the narrow viewing angle display mode, all the LED lamps 141 of the light bars 140 in the first area 131 and the second area 132 may be turned on by half, for example, the LED lamps 142 inclined in the first direction in the first area 131 and the LED lamps 143 inclined in the second direction in the second area 132 are turned on, and the other LED lamps are turned off, so that the light emitted from each light bar 140 is converged toward the center of the display panel 110.
The plurality of LED lamps 142 inclined in the first direction and the plurality of LED lamps 143 inclined in the second direction may be individually turned on and off. That is, the plurality of LED lamps 142 inclined in the first direction and the plurality of LED lamps 143 inclined in the second direction are respectively driven and controlled by two different LEDs. Specifically, the plurality of LED lamps 142 inclined in the first direction in each light bar 140 are turned on when receiving the first control current I1, and the plurality of LED lamps 143 inclined in the second direction are turned on when receiving the second control current I2. The first control current I1 and the second control current I2 are set to be one-half of rated current in the first display mode, and the first control current I1 and the second control current I2 are set to be rated current in the second display mode.
Then, in the wide viewing angle mode, the LED lamps on both sides of each light bar 140 are turned on, and the LED lamps 142 inclined in the first direction and the LED lamps 143 inclined in the second direction respectively receive half of the rated current, while in the narrow viewing angle mode, only one LED lamp of each light bar 140 is turned on, and the LED lamps 142 inclined in the first direction and the LED lamps 143 inclined in the second direction respectively receive the rated current, so as to ensure that the total light emitting brightness of the backlight module 120 in the wide viewing angle mode and the narrow viewing angle mode remains unchanged.
The LED lamp in each light bar in this embodiment is tilted in two directions and divides the back plate 130 into left and right two regions, respectively. However, it should be apparent to those skilled in the art that the embodiments of the present disclosure are not limited thereto, and the tilting direction of the LED lamp in each light bar may be set as desired, for example, to be tilted toward three or more directions, and the back panel is divided into regions accordingly, thereby achieving the purpose of wide viewing angle display and narrow viewing angle display. Correspondingly, the magnitude of the control current can also be set according to the proportion of the number of the LED lamps which are turned on and off in the two modes, so that the aim of keeping the display brightness consistent in the different modes is fulfilled.
The wide and narrow visual angle switching display device provided by the invention adopts the direct type backlight, the brightness is higher, the pattern is bright and clear, the backlight light-emitting angle is adjusted by switching the on and off of the LED lamps in different directions, and the wide and narrow visual angle switching effect is achieved. When the display visual angle is switched, the display brightness is controlled by controlling the current flowing through the lamp strip and the number of the turned-on LED lamps, the consistency of the screen brightness is kept when the visual angle is switched, the picture flicker is avoided, the dazzling is avoided, and a good film watching effect can be brought to a user.
Several embodiments of light bar configurations are given below with reference to fig. 3 and 4.
Fig. 3 is a schematic structural diagram illustrating a light bar of a wide-and-narrow-viewing-angle switching display device according to a first embodiment of the invention. As shown, taking an optional light bar 140 structure as an example, each light bar 140 includes: a bottom plate 144 disposed in a strip shape and placed on the bottom surface of the back plate 130; and a plurality of mounting plates 145 vertically mounted on the base plate 144 and arranged parallel to each other, each mounting plate 145 having two surfaces inclined in the first and second directions, respectively, on the top thereof, one LED lamp being provided on each surface.
As shown in fig. 3, the bottom plate 144 and the mounting plate 145 are light bar fixing devices, and the cross section of the mounting plate 145 is polygonal, such as pentagonal or triangular. Preferably, the mounting board 145 has a pentagonal cross-section, and the top thereof includes two surfaces inclined in the first and second directions, respectively, which match the LED lamps described in fig. 2a and 2b, which are inclined in the two directions. The plurality of LED lamps 142 inclined in the first direction are respectively disposed on the surfaces inclined in the first direction on the tops of the plurality of mounting boards 145, and the plurality of LED lamps 143 inclined in the second direction are respectively disposed on the surfaces inclined in the second direction on the tops of the plurality of mounting boards 145.
Fig. 4 is a schematic structural diagram illustrating an LED light bar of a wide-and-narrow-viewing-angle switching display device according to a second embodiment of the invention. Each light bar 240 of the present embodiment includes: the bottom plate 244 is arranged in a strip shape, and clamping grooves 246 are formed in two sides of the bottom plate 244; and a plurality of mounting plates 245 vertically mounted on the base plate 244 and arranged in parallel with each other, each mounting plate 245 having an inverted V shape and having a bottom configured to match the card slot 246 to be mounted on the base plate 244 through the card slot 246, one LED lamp being mounted on each of two inclined surfaces of the inverted V shape. In the drawing, an LED lamp 242 inclined in a first direction and an LED lamp 243 inclined in a second direction are mounted on the inclined surfaces in two directions, respectively. The use of the light bar 240 in this embodiment is the same as that described in fig. 3, and is not described herein again.
Fig. 3 and 4 are structural schematic diagrams of a part of LED lamps and a mounting plate on one light bar, and the number of the LED lamps on each light bar in actual production is set according to requirements. Only two schematic structures of the light bar are shown here, but the structure of the light bar is not limited thereto. The lamp strips with different structures can be selected in different embodiments, or several lamp strips can be mixed for use.
Fig. 5a and 5b are schematic diagrams illustrating an operation principle of the wide and narrow viewing angle switching display device according to the first embodiment of the present invention.
As shown in fig. 5a, all the LED lamps in all the light bars 140 in the first area 131 and the second area 132 are turned on, and at this time, in the first display mode, the currents received by the LED lamps 142 inclined in the first direction and the LED lamps 143 inclined in the second direction in all the light bars 140 are both half of the rated current, the light rays are spread to both sides, the display area of the whole display panel 110 has uniform light rays, and the display mode with a wide viewing angle can be realized.
As shown in fig. 5b, the plurality of LED lamps 142 inclined in the first direction in each light bar 140 in the first region 131 are turned on, and the plurality of LED lamps 143 inclined in the second direction in each light bar 140 in the second region 132 are turned on. At this time, the second display mode is realized, and the currents received by the plurality of LED lamps 142 inclined along the first direction in each light bar 140 in the first region 131 and the plurality of LED lamps 143 inclined along the second direction in each light bar 140 in the second region 132 are rated currents, so that the light is converged toward the center of the display panel 110, and the display mode with a narrow viewing angle is achieved. The difference of the starting numbers of the LEDs and the like and the difference of the control currents in the two modes enable the lamp strip brightness in the two modes to be the same, so that the consistency of the screen brightness is guaranteed, the flicker of pictures is avoided, and the film watching effect is kept.
The present embodiment ensures the uniformity of the screen brightness when switching the mode by controlling the magnitude of the current intensity, and preferably, the brightness of the LED lamp can also be adjusted by setting the duty ratio through PWM (pulse width modulation), so as to keep the display brightness of the screen unchanged.
The wide and narrow visual angle switching display device can realize the switching of two different display modes, can also ensure the consistency of screen brightness during switching, maintain good viewing effect, and can realize the peep-proof function and timely switch the display modes according to the requirements because the brightness of the central part of the screen is higher during the narrow visual angle display mode.
Fig. 6a is a perspective view illustrating a structure of a back panel and a light bar inside a wide and narrow viewing angle switching display device according to a third embodiment of the invention. Fig. 6b shows a cross-sectional view of a wide-narrow viewing angle switching display device according to a third embodiment of the present invention along the line a-a' in fig. 1.
The overall structure of the wide-narrow viewing angle switching display device of this embodiment is the same as that of the first embodiment, and is not repeated herein, but the difference is the structure of the back panel and the light bar, which is described in detail below with reference to fig. 6a and 6 b.
Referring to fig. 6a and 6b, in the present embodiment, the bottom surface of the back plate 330 is formed in a wave shape, the wave shape has a trapezoidal section, preferably, an isosceles trapezoid, and two inclined surfaces of the trapezoid form a predetermined angle with each other. LED lamps are mounted on both inclined surfaces. In this embodiment, each light bar 340 includes two sub light bars 470, and the two sub light bars 470 are respectively disposed on two inclined surfaces of the corresponding trapezoid. Each sub light bar 470 may include a bottom plate 471 arranged in a bar shape and a plurality of LED lights 472. A plurality of LED lamps 472 are installed on the bottom plate 471 and arranged in parallel with each other such that the LED lamps 472 on both sides of each trapezoid are at an angle to each other, and in this embodiment, the LED lamps 472 include an LED lamp 473 inclined in a first direction and an LED lamp 474 inclined in a second direction. .
The wavy structure of the back plate 330 is formed by sheet metal stamping. For example, the bottom surface of the back plate 330 is stamped by a metal plate to form an uneven surface including a plurality of trapezoid structures, and the light bar 340 having a plurality of LED lamps is attached to two inclined surfaces of the trapezoid structures by a double-sided tape or the like. Similar to the above embodiments, the wide-narrow viewing angle switching display device of the present embodiment can also realize the switching of the display modes by controlling the on/off of each LED lamp in the light bars on the two inclined surfaces, and the details are not repeated herein.
In any embodiment of the invention, the same LED lamps can be selected for all the lamp strips, or different types of LED lamps can be selected for different inclined directions as long as the brightness of the two different LED lamps is the same in the two display modes. The plurality of LED lamps 142 inclined in the first direction in the first region 131 of the first embodiment are the same as the plurality of LED lamps 143 inclined in the second direction in the second region 132; the plurality of LED lamps 143 inclined in the second direction in the first region 131 are the same as the plurality of LED lamps 142 inclined in the first direction in the second region 132. In the embodiment, all the LED lamps inclined in the first direction are the same, and all the LED lamps inclined in the second direction are the same.
During the design, can change the light-emitting effect through the size that changes preset angle, adjust different angles according to the light efficiency, select the most suitable angle range to reach the best spotlight effect of narrow visual angle. Preferably, the preset angle may be set in the range of 30 ° to 60 °.
Fig. 7a and 7b are schematic diagrams illustrating an operation principle of a wide and narrow viewing angle switching display device according to a third embodiment of the present invention. The display mode and the on/off of the light bar of the wide-narrow viewing angle switching display device of this embodiment are the same as those of the first embodiment, the back panel 330 also includes two symmetrical regions, and the LED lights in different directions in different regions are turned on in different display modes.
In a first display mode, namely a wide viewing angle display mode, the LED lamps 472 on all the lamp strips in the first area 331 and the second area 332 are all turned on, the currents received by the sub-lamp strips 470 inclined in the first direction and the sub-lamp strips 470 inclined in the second direction are both half of the rated current, and light rays are scattered to both sides; in the second display mode, i.e., the narrow viewing angle display mode, all of the LED lamps 473 in the sub-strip 470 of each light bar in the first direction in the first region 331 are turned on, and all of the LED lamps 474 in the sub-strip 470 of each light bar in the second direction in the second region 332 are turned on. All the LED lamps 473 in each sub-strip 470 inclined in the first direction in the first region 331 and all the LED lamps 474 in each sub-strip 470 inclined in the second direction in the second region 332 receive rated current, and light converges toward the center of the display panel, and the brightness of the light bars in the two modes is the same.
Preferably, all of the first display modes described above are wide viewing angle display modes, and the second display mode is a narrow viewing angle display mode.
The LED lamp strips are arranged in a ridge type manner, compared with a liquid crystal display panel with the LED lamp strips arranged on one side, the arrangement density of the LED lamps of the liquid crystal display panel is increased, and meanwhile, the LED lamps are lightened, so that the overall display brightness of the liquid crystal display panel can be improved, and the backlight light emitting is more uniform. Moreover, the angle of the lamp strip has a certain set range, so that a proper light-emitting angle is ensured, and light is fully utilized.
Preferably, in the above embodiment, even numbers of the light bars of the wide-and-narrow-viewing-angle switching display device are taken as examples, the numbers of the light bars in the first area and the second area are the same, and the light-emitting brightness of the two areas is uniform. However, the invention is still suitable for the condition that odd number of LED lamp bars are arranged on the bottom surface of the back plate. At this time, the wide and narrow viewing angle switching display device of the present invention further includes an independent light bar located between the first region and the second region, the independent light bar having the same structure as the light bar described in the above embodiments, and also including a plurality of LED lamps inclined in the first direction and a plurality of LED lamps inclined in the second direction, but the plurality of LED lamps inclined in the first direction and the plurality of LED lamps inclined in the second direction of the present embodiment are turned on simultaneously regardless of the display mode, and the current flowing through each LED lamp is equal to the current intensity of the second display mode. Therefore, the display brightness of the central area of the screen can be improved, and the peep-proof effect is enhanced.
The wide and narrow visual angle switching display device provided by the invention adopts the direct type backlight, the brightness is higher, the pattern is bright and clear, the backlight light-emitting angle is adjusted by switching the on and off of the LED lamps in different directions, and the wide and narrow visual angle switching effect is achieved. When the display visual angle is switched, the display brightness is controlled by controlling the current flowing through the LED lamp, the consistency of the screen brightness is kept when the visual angle is switched, the picture flicker is avoided, and the film watching effect is enhanced. And the lamp strip adopts the mode of arranging of ridge formula, can increase the density of arranging of LED lamp, lights these LED lamps simultaneously, can improve liquid crystal display panel's display brightness, and the light-emitting is shaded more evenly.
Finally, it should be noted that: while embodiments in accordance with the invention have been described above, these embodiments are not intended to be exhaustive or to limit the invention to the precise embodiments described. Obviously, many modifications and variations are possible in light of the above teaching. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention. The embodiment was chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best utilize the invention and its various embodiments with various modifications as are suited to the particular use contemplated.
Claims (9)
1. A wide-narrow viewing angle switching display device comprising: the backlight module comprises a back plate, a plurality of light bars positioned on the back plate, a diffusion plate positioned below the display panel and a rubber frame surrounding the display panel,
the LED lamp is characterized in that the plurality of lamp strips are uniformly distributed on the bottom surface of the back plate, the back plate comprises a first area and a second area which are symmetrical, each lamp strip comprises a plurality of LED lamps inclined along a first direction and a plurality of LED lamps inclined along a second direction, a preset angle is formed between the first direction and the second direction, in the first display mode, all the LED lamps in each lamp strip are turned on, so that the light emitted by each lamp strip is diffused in different directions, in a second display mode, a plurality of LED lamps inclined along the first direction in each light bar in the first area are turned on, a plurality of LED lamps inclined along the second direction in each lamp strip in the second area are turned on, so that the light emitted by each lamp strip is converged towards the center of the display panel, the current flowing through each light bar in the first display mode and the second display mode is set to enable the light emitting brightness of each light bar to be equal.
2. The switching display device of claim 1, wherein the plurality of light bars are arranged in parallel on the back plate at the same interval.
3. The switching display device of claim 1, wherein the plurality of LED lamps in each of the light bars tilting in the first direction are turned on when receiving a first control current, and the plurality of LED lamps tilting in the second direction are turned on when receiving a second control current, wherein the first control current and the second control current are half of rated current in the first display mode, and the first control current and the second control current are rated current in the second display mode.
4. The switching display device of claim 1, wherein each of the light bars comprises:
the bottom plate is arranged into a strip shape;
and a plurality of mounting plates vertically mounted on the base plate and arranged in parallel with each other, each of the mounting plates having two surfaces inclined in the first direction and the second direction, respectively, each of the surfaces being provided with one LED lamp.
5. The switching display device of claim 1, wherein each of the light bars comprises:
the bottom plate is arranged in a strip shape, and clamping grooves are formed in two sides of the bottom plate;
the mounting plates are vertically arranged on the bottom plate and are arranged in parallel with each other, each mounting plate is V-shaped, the bottom of each mounting plate is arranged to be matched with the clamping groove, the mounting plates are mounted on the bottom plate through the clamping grooves, and one LED lamp is mounted on each of two inclined surfaces of the V-shape.
6. The switching display device of wide and narrow viewing angles according to claim 1, wherein the bottom surface of the back plate is formed in a wave shape, the wave shape has a trapezoid shape, and two inclined surfaces of the trapezoid form the preset angle with each other;
each light bar comprises two sub light bars, and the two sub light bars are respectively arranged on the two corresponding trapezoidal inclined surfaces.
7. The device of claim 6, wherein each of the sub light bars comprises:
the bottom plate is arranged into a strip shape;
a plurality of LED lamps mounted on the base plate and arranged in parallel with each other.
8. The wide-narrow viewing angle switching display device according to claim 6, wherein the wavy structure of the back plate is formed by sheet metal stamping.
9. The switching display device of wide and narrow viewing angles according to claim 1, wherein the preset angle is in the range of 30 ° to 60 °.
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| CN109471302A (en) * | 2018-12-25 | 2019-03-15 | 中航华东光电有限公司 | A kind of bottom back lighting device with visual angle deflection |
| CN109491146B (en) * | 2019-01-15 | 2022-04-26 | 高创(苏州)电子有限公司 | Light-emitting module and manufacturing method thereof, direct type backlight module and display device |
| CN109656052B (en) * | 2019-01-18 | 2022-04-22 | 昆山龙腾光电股份有限公司 | Liquid crystal display panel, manufacturing method thereof and display device |
| CN111986626B (en) * | 2020-08-07 | 2021-09-24 | 深圳市华星光电半导体显示技术有限公司 | Method for calculating brightness visual angle of backlight module unknown in advance and backlight module |
| CN113448112B (en) * | 2020-08-13 | 2022-05-20 | 重庆康佳光电技术研究院有限公司 | Display panel and electronic device |
| US11862113B2 (en) | 2020-08-13 | 2024-01-02 | Chongqing Konka Photoelectric Technology Research Institute Co., Ltd. | Display panel and electronic device |
| CN114255713A (en) * | 2020-09-24 | 2022-03-29 | 京东方科技集团股份有限公司 | Backlight module, display device and control method thereof |
| CN114253012B (en) * | 2021-12-31 | 2023-09-22 | 天马微电子股份有限公司 | Display device, backlight source and automobile |
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