CN107219683B - Display device, backlight module and backlight source - Google Patents

Display device, backlight module and backlight source Download PDF

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Publication number
CN107219683B
CN107219683B CN201710610768.4A CN201710610768A CN107219683B CN 107219683 B CN107219683 B CN 107219683B CN 201710610768 A CN201710610768 A CN 201710610768A CN 107219683 B CN107219683 B CN 107219683B
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light
pin
emitting chip
chromaticity
fluorescent
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CN107219683A (en
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柯耀作
沈贺文
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Xiamen Tianma Microelectronics Co Ltd
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Xiamen Tianma Microelectronics Co Ltd
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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
    • 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
    • G02F1/133614—Illuminating devices using photoluminescence, e.g. phosphors illuminated by UV or blue light

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  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • Mathematical Physics (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Liquid Crystal (AREA)
  • Planar Illumination Modules (AREA)

Abstract

The invention discloses a display device, a backlight module and a backlight source. The backlight light source includes: a plurality of light emitting unit LED particles, wherein the LED particles include: the fluorescent lamp comprises a first cavity, a second cavity, a first light-emitting chip, a first fluorescent powder mixture and a second light-emitting chip, wherein the first cavity and the second cavity are mutually independent, the first light-emitting chip and the first fluorescent powder mixture are arranged in the first cavity, and the second light-emitting chip and the second fluorescent powder mixture are arranged in the second cavity; and the connecting circuit is respectively connected with the first light-emitting chip and the second light-emitting chip and is used for applying a first current to the first light-emitting chip and applying a second current to the second light-emitting chip, wherein the proportion of the first current to the second current is adjustable. The invention provides a method for adjusting the current proportion of two chips of LED particles to realize the chromaticity adjustment of a backlight source, which can realize the chromaticity adjustment of a backlight module and does not influence the display effect of a liquid crystal panel.

Description

Display device, backlight module and backlight source
Technical Field
The invention relates to the technical field of display, in particular to a display device, a backlight module and a backlight source.
Background
The lcd device is a passive light emitting display device, and the lcd panel does not emit light, but is illuminated by a backlight module below the lcd panel. The backlight module comprises a backlight source, a light guide plate, a reflector plate, an optical diaphragm and the like, when light emitted by the backlight module irradiates on the liquid crystal panel, the light can upwards penetrate through the lower polarizer, different liquid crystal panels can change the polarization direction of the light according to the mechanism of the liquid crystal panels, the light contacts the color filter to generate color, and the color is finally incident to the upper polarizer. After the polarization direction of the light is converted by the liquid crystal, part of the light can be emitted, part of the light can be absorbed, and each pixel on the whole liquid crystal panel can respectively determine the intensity of the emitted light, so that an image is generated.
In the prior art, after the backlight source of the backlight module is manufactured, the chromaticity of the light of the backlight module is fixed, and since different liquid crystal panels have different chromaticity specifications, the backlight module with different chromaticity of the light needs to be selected to correspond to the chromaticity of the light, and generally, backlight module manufacturers can produce backlight modules with various chromaticity of the light so as to meet the requirement that the chromaticity of the backlight module is matched with that of the liquid crystal panels. However, the light chromaticity of the backlight module is limited, and the problem that the backlight module with better chromaticity matching with the liquid crystal panel cannot be found often occurs, which affects the display effect of the liquid crystal panel.
In addition, when the backlight module is selected, the backlight module with the matched theoretical chromaticity of the liquid crystal panel is usually selected, the chromaticity drift phenomenon of the liquid crystal panel can occur in the process of forming the liquid crystal panel into a box, and the difference occurs between the actual chromaticity and the theoretical chromaticity of the liquid crystal panel.
Therefore, it is an urgent need in the art to provide a backlight source, a backlight module and a display device with adjustable light chromaticity without affecting the display effect of the liquid crystal display panel.
Disclosure of Invention
In view of the above, the present invention provides a display device, a backlight module and a backlight source, which solve the technical problem in the prior art that the display effect of a liquid crystal panel is poor due to adjusting the chromaticity of the backlight module by adjusting the 3gamma program of the liquid crystal panel.
In order to solve the above technical problems, the present invention provides a backlight source.
The backlight light source includes: a plurality of light emitting unit LED particles, wherein the LED particles include: the fluorescent lamp comprises a first cavity, a second cavity, a first light-emitting chip, a first fluorescent powder mixture, a second light-emitting chip and a second fluorescent powder mixture, wherein the first light-emitting chip and the first fluorescent powder mixture are arranged in the first cavity, the first light-emitting chip and the first fluorescent powder mixture are independent from each other; and the connecting circuit is respectively connected with the first light-emitting chip and the second light-emitting chip and is used for applying a first current to the first light-emitting chip and applying a second current to the second light-emitting chip, wherein the proportion of the first current to the second current is adjustable.
In order to solve the above technical problems, the present invention provides a backlight module. The backlight module comprises any one of the backlight light sources provided by the invention.
In order to solve the above technical problem, the present invention provides a display device. The display device comprises any one of the backlight modules provided by the invention.
Compared with the prior art, the display device, the backlight module and the backlight source of the invention have the following beneficial effects:
the LED particles of the backlight source are provided with two independent cavities, each cavity is respectively provided with a light emitting chip and a fluorescent mixture, the chromaticity of light generated by the fluorescent mixtures of different cavities is different, the two light emitting chips apply current independently, the chromaticity of light generated by the whole LED particles can be adjusted by adjusting the current proportion applied by the two light emitting chips, the backlight module is matched with liquid crystal panels with different chromaticity specifications, in addition, when the chromaticity of the liquid crystal panel drifts, 3gamma programs do not need to be adjusted, the penetration rate and the response speed of the liquid crystal panel can be improved, in addition, the two cavities are packaged in the same LED particle, the light mixing distance of the two cavities is short, and the problem of chromatic aberration between the two kinds of light with different chromaticities is avoided.
Other features of the present invention and advantages thereof will become apparent from the following detailed description of exemplary embodiments thereof, which proceeds with reference to the accompanying drawings.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description, serve to explain the principles of the invention.
Fig. 1 is an exploded view of a display device according to an embodiment of the present disclosure;
fig. 2 is a schematic structural diagram of a backlight source provided in an embodiment of the present application;
fig. 3 is a schematic structural diagram of an LED particle provided in an embodiment of the present application;
FIG. 4 is a chromaticity diagram provided by an embodiment of the present application;
FIG. 5 is an exploded view of the backlight module according to the present embodiment; and
fig. 6 is a schematic structural diagram of a display device according to an embodiment of the present invention.
Detailed Description
Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that: the relative arrangement of the components and steps, the numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless specifically stated otherwise.
The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses.
Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate.
In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.
The invention relates to a backlight module for a display device, and fig. 1 is a structural explosion diagram of the display device provided by the embodiment of the application, and properly refers to fig. 1, the display device comprises a backlight module 10, an upper polarizer 20, a color film substrate 30, a liquid crystal layer 40, an array substrate 50 and a lower polarizer 60, wherein the backlight module 10 comprises a backlight source 11 and an optical module 12, the optical module 12 comprises a light guide plate, a reflector, a brightness enhancement film and the like, light generated by the backlight source 11 irradiates the lower polarizer 60 through the optical module 12, firstly, the light is upwards transmitted to the liquid crystal layer 40 through the lower polarizer 60, the liquid crystal layer 40 converts the polarization direction of the light, then, the light contacts the color film substrate 30, red, green and blue (RGB) color resistors are arranged on the color film substrate 30, the color generated through the color resistors is incident to the upper polarizer 20, and an image is generated through the upper.
Based on the characteristics of the color resists, the red color resists allow the part of the light with the wavelength of red light to transmit, the green color resists allow the part of the light with the wavelength of green light to transmit, the blue color resists allow the part of the light with the wavelength of blue light to transmit, and in order to ensure that the light with the polarization direction converted by the liquid crystal layer 40 can all transmit the color resists, under general conditions, the light generated by the backlight source 11 is white light, or the proportion of RGB is similar to 1:1:1, or a mixed light.
Fig. 2 is a schematic structural diagram of a backlight source provided in an embodiment of the present application, and referring to fig. 2 as appropriate, in an embodiment, the backlight source 11 includes a flexible circuit board 111 and a plurality of LED particles 112 sequentially arranged on the flexible circuit board 111 along a first direction a, and a connection circuit 113 is further disposed on the flexible circuit board 111, and the connection circuit 113 is configured to apply a voltage to light emitting chips in the LED particles 112 to enable the LED particles to emit light, so as to generate light.
Fig. 3 is a schematic structural diagram of an LED particle provided in an embodiment of the present application, and referring to fig. 3 as appropriate, the LED particle 112 includes a first cavity 112L and a second cavity 112R that are independent from each other, and in an embodiment, the LED particle 112 includes a support 1124, and the support 1124 is injection molded to form the first cavity 112L and the second cavity 112R.
A first luminescent chip 1121L and a first fluorescent mixture 1122L are disposed in the first cavity 112L, and the first luminescent chip 1121L excites the first fluorescent mixture 1122L, so that the first cavity 112L generates a first light; in the second cavity 112R, a second light emitting chip 1121R and a second fluorescent mixture 1122R are disposed, and the second light emitting chip 1121R excites the second fluorescent mixture 1122R, so that the second cavity 112R generates a second light.
The second phosphor mixture 1122R and the first phosphor mixture 1122L both include phosphors, and light generated by the second phosphor mixture 1122R and light generated by the first phosphor mixture 1122L have different chromaticities.
The first light emitting chip 1121L and the second light emitting chip 1121R are connected to a connection circuit 113, respectively, and the connection circuit 113 applies a first current to the first light emitting chip 1121L and a second current to the second light emitting chip 1121R. The brightness of the light generated by the cavity is influenced by the magnitude of the current, and the proportion of the first current to the second current is different, so that the proportion of the light with different chromaticities in the first cavity 112L and the second cavity 112R to the total light amount is different, therefore, under the condition that the total current applied to the LED particles is equal, the proportion of the first current to the second current is adjusted, the proportion of the light in the two cavities of the LED particles to the total light amount can be adjusted, further, the adjustment of the chromaticity after the color mixing of the light in the two cavities is realized, namely, the chromaticity adjustment of the light generated by the whole LED particles is realized, namely, the purpose of adjusting the chromaticity of the LED particles can be realized by adjusting the proportion of the first current to the second current.
To sum up, in the backlight source provided by the embodiment of the present application, the LED particles of the backlight source are provided with two independent cavities, each cavity is respectively provided with a light emitting chip and a fluorescent mixture, the chromaticity of light generated by the fluorescent mixtures of different cavities is different, and the current is applied to the two light emitting chips separately, and the ratio of the current applied to the two light emitting chips is adjustable, so that the purpose of adjusting the chromaticity of the LED particles is achieved by adjusting the ratio of the first current to the second current.
Therefore, the backlight source provided by the embodiment of the application can adjust the chromaticity of the LED particles by adjusting the currents of the two light emitting chips, so that different color mixing effects can be realized, the liquid crystal panels with different chromaticity specifications can be matched, and when the chromaticity of the liquid crystal panels drifts, 3gamma programs do not need to be adjusted, so that the penetration rate and the response speed of the liquid crystal panels can be improved.
Further, in an alternative embodiment, the first light emitting chip 112L and the second light emitting chip 112R are the same, for example, the first light emitting chip 112L and the second light emitting chip 112R are both R chips, or both G chips or both B chips.
By adopting the embodiment, the two cavities of the LED particles adopt the same type of light-emitting chips, so that the two cavities have similar excitation efficiency and service life, the color consistency of the backlight source in long-term use is improved, and the problem of color decay is not easy to occur.
Furthermore, the first fluorescent powder and the second fluorescent powder are made of the same material, so that the two cavities of the LED particles adopt the same light-emitting chip and the same fluorescent powder, and the optical properties of the light-emitting chips and the optical properties of the fluorescent powder of the two cavities are the same, so that the two cavities have the same excitation efficiency and service life, the long-term use color consistency of the backlight source is ensured, and the problem of color decay is avoided.
In an alternative embodiment, the phosphor mixture in the cavity includes a phosphor and a gel material, wherein the phosphor is primarily optically active, the gel material is used for mixing, protecting and fixing the phosphor, and the concentration of the phosphor in the phosphor mixture, and the chromaticity of the phosphor, all affect the chromaticity of the phosphor mixture. Specifically, the first fluorescent mixture and the second fluorescent mixture both comprise a phosphor and a colloidal material. When the chromaticity difference between the light emitted from the first fluorescent mixture and the light emitted from the second fluorescent mixture is realized, the chromaticity difference can be realized by setting the concentrations of the phosphors in the first fluorescent mixture and the second fluorescent mixture to be different, or by setting the chromaticities of the phosphors in the first fluorescent mixture and the second fluorescent mixture to be different.
For example, the silicates are used as the fluorescent powders in the first fluorescent mixture and the second fluorescent mixture, wherein the silicates are a general term for compounds composed of silicon, oxygen and metal elements, and when the metal elements of the silicates are different, the colors of the silicates are different, so that the fluorescent powders in the first fluorescent mixture and the fluorescent powders in the second fluorescent mixture are silicates with different metal elements, so that the chromaticities of the fluorescent powders in the first fluorescent mixture and the fluorescent powders in the second fluorescent mixture are different, and further, the chromaticity of light emitted by the first fluorescent mixture is different from that of light emitted by the second fluorescent mixture.
For another example, yttrium aluminum garnet crystals (i.e., YAG) are used as the phosphors in the first and second fluorescent mixtures, wherein the pure yttrium aluminum garnet crystals are colorless and transparent, and are doped with different metals to make the crystals appear different colors, specifically, zirconium is used in synthesizing yttrium aluminum garnet crystals to make the garnet appear red, scandium oxide is added to change the color tone of red garnet, and make the garnet appear bright red or deep red. When ytterbium, zirconium and cerium are used in the synthesis of the yttrium aluminum garnet crystal, the obtained crystal is green, wherein the garnet obtained has different color tones such as dark green, bright green, yellow green and the like due to different cerium ion contents in the crystal, and if europium, zirconium and terbium are doped, the synthesized garnet crystal can be blue. Therefore, the phosphor in the first phosphor mixture and the phosphor in the second phosphor mixture are YAG doped with different metal elements or different metal contents, so that the chromaticities of the phosphor in the first phosphor mixture and the phosphor in the second phosphor mixture are different, and further, the chromaticity of light emitted by the first phosphor mixture is different from that of light emitted by the second phosphor mixture.
Further, the chromaticity of the light generated by the first fluorescent mixture has a first chromaticity coordinate on a chromaticity diagram, and the chromaticity of the light generated by the second fluorescent mixture has a second chromaticity coordinate on the chromaticity diagram, wherein the chromaticity diagram is a two-dimensional diagram plotted with chromaticity coordinates x and y, fig. 4 is the chromaticity diagram provided by the embodiment of the present application, as shown in fig. 4, x is the horizontal axis of the chromaticity diagram, y is the vertical axis of the chromaticity diagram, the arched curve is composed of pure spectral colors of 380 to 770nm, the chromaticity is a color determined by the wavelength, such as the hue of 700nm light is red, the hue of 579nm light is yellow, the hue of 510nm light is green, and so on.
Referring to fig. 4, the point marked on the chromaticity diagram by the first chromaticity coordinate (x1, y1) is point L, and the point marked on the chromaticity diagram by the second chromaticity coordinate (x2, y2) is point R, wherein, as described above, in order to ensure that the light with the polarization direction converted by the liquid crystal layer can pass through the color resistance, the light output by the backlight source is a mixed light of white light or nearly white light, that is, the light of the LED particles obtained by mixing the light generated by the first cavity and the light generated by the second cavity is a mixed light of white light or nearly white light.
Generally, different customers have different requirements for the chromaticity of the display panel provided by the panel manufacturer due to different color recognizability and preferences of people in different regions or different ethnic groups, for example, some customers need a slightly blue display panel, and some customers need a slightly yellow display panel. In order to match the backlight module with its own panel, the panel manufacturer requires that the chromaticity coordinate of the chromaticity of the light output by the backlight source on the chromaticity diagram is a predetermined value, in other words, requires that the point marked by the chromaticity coordinate of the chromaticity of the light output by the backlight source on the chromaticity diagram is a fixed point, which is defined as a predetermined white point in the present application. The predetermined white point may be a color coordinate of the standard white light or a color coordinate slightly deviating from the standard white light according to the requirement of the customer.
Wherein, in an alternative embodiment, the difference between the abscissa x1 of the first chromaticity coordinate and the abscissa x2 of the second chromaticity coordinate is greater than or equal to 0.005 and less than or equal to 0.02, and the difference between the ordinate y1 of the first chromaticity coordinate and the ordinate y1 of the second chromaticity coordinate is greater than or equal to 0.005 and less than or equal to 0.02, in which embodiment the minimum values of the difference between the abscissas of the first chromaticity coordinate and the second chromaticity coordinate, respectively, are defined, defining the minimum difference in chromaticity of the light emitted by the first fluorescent mixture and the light emitted by the second fluorescent mixture, ensuring that the chromaticity of the light emitted by the first fluorescent mixture is different from the chromaticity of the light emitted by the second fluorescent mixture; the maximum values between the horizontal and vertical coordinates of the first chromaticity coordinate and the second chromaticity coordinate are respectively limited, and the mixed light of white light or approximate white light can be obtained after the light emitted by the first fluorescent mixture and the light emitted by the second fluorescent mixture are excited and mixed by the light emitting chip.
Furthermore, the first light emitting chip and the second light emitting chip are blue light emitting chips, and on the basis of meeting the requirement of difference between the first chromaticity coordinate and the second chromaticity coordinate, the abscissa of the first chromaticity coordinate is 0.3 to 0.5, the ordinate of the first chromaticity coordinate is 0.4 to 0.6, the abscissa of the second chromaticity coordinate is 0.08 to 0.18, and the ordinate of the second chromaticity coordinate is 0.15 to 0.3.
Referring to fig. 4, in this embodiment, by defining the first chromaticity coordinate and the second chromaticity coordinate as ranges, the first fluorescent mixture is defined to generate light with a chromaticity shifted to blue, the second fluorescent mixture is defined to generate light with a chromaticity shifted to yellow, the first light emitting chip and the second light emitting chip are both blue chips, the blue chips have long lifetime and high excitation efficiency, and meanwhile, the light emitted by the first fluorescent mixture is shifted to yellow and the light emitted by the second fluorescent mixture is shifted to blue, so that a mixed light of white light and approximately white light can be obtained.
For example, the first coordinate of the first chromaticity coordinate is 0.40, the second coordinate of the first chromaticity coordinate is 0.55, the first coordinate of the second chromaticity coordinate is 0.15, and the second coordinate of the second chromaticity coordinate is 0.25.
Further, with continued reference to FIG. 4, in an alternative embodiment, the point L marked with the first chromaticity coordinate is a first distance L from a predetermined white point O on the chromaticity diagram1The distance between the point R marked by the second chromaticity coordinate and the predetermined white point O is a second distance l2Wherein the predetermined white point is a point at which the chromaticity coordinates of the light output by the backlight light source are at a chromaticity diagram point, wherein the light output by the backlight light source may be white light with an RGB ratio of 1:1:1, or mixed light of approximately white light with an RGB ratio approximately equal to 1:1:1, for example, the coordinates of the predetermined white point O is (0.30, 0.31), or the coordinates of the predetermined white point O is (0.30, 0.32).
It should be noted that the distance between two points (first distance l) is referred to in the present application1A second distance l2) Using pythagorean theorem to calculate, specifically, let R (a1, a2), O (b1, b2), and the distance between ROs RO ═ [ (a1-b1)2+(a2-b2)2]1/2. Wherein RO is the second distance l2。
When the proportion of the first current and the second current is adjusted, the first distance l is adjusted according to the first distance1And a second distance l2The ratio is adjusted to make the ratio of the first current to the second current equal to the second distance l2A first distance l from1Wherein the farther a point is from the predetermined white point, the greater the chromaticity difference from the predetermined white point, and the smaller the amount of light required for the farther chromaticity is for the light that produces the predetermined white point; the larger the current of the chip is, the higher the brightness of the light generated by the cavity where the light-emitting chip is located is, and the larger the proportion of the light generated by the cavity in the total light quantity is, so that the ratio of the first current to the second current is set to be equal to the second distance l2A first distance l from1Ratio of (a) in1>l2When the light generating the predetermined white point O is detected, the first current is smaller than the second current, and the proportion of the light emitted by the first cavity to the total light amount is smaller than the proportion of the light emitted by the second cavity to the total light amount.
Further, in an alternative embodiment, with reference to fig. 3, the LED chip 112 further includes a first fixing member 1123L disposed in the first cavity 112L and a second fixing member 1123R disposed in the second cavity 112R, wherein the first fixing member 1123L is used for fixing and connecting the first light emitting chip 1121L, and the second fixing member 1123R is used for fixing and connecting the second light emitting chip 1121R. The first light emitting chip 1121L is fixed to the first fixing member 1123L, and the second light emitting chip 1121R is fixed to the second fixing member 1123R.
The first end 1121L1 of the first light emitting chip 1121L, the second end 1121L2 of the first light emitting chip 1121L1, the first end 1121R1 of the second light emitting chip 1121R, and the second end 1121R2 of the second light emitting chip 1121R are arranged in this order in the first direction a.
The first fixing member 1123L has a first pin a1 'and a second pin a2', a first end 1121L1 of the first light emitting chip 1121L is connected to the first pin a1', and a second end 1121L2 of the first light emitting chip 1121L is connected to the second pin a 2'; the second anchor 1123R has a third pin K1 'and a fourth pin K2', the first end 1121R1 of the second light emitting chip 1121R is connected to the third pin K1', and the second end 1121R2 of the second light emitting chip 1121R is connected to the fourth pin K2'.
The first pin a1', the second pin a2', the third pin K1 'and the fourth pin K2' are connected to the connection circuit 113, respectively. Meanwhile, the LED particles 112 are soldered on the flexible circuit board 111 through the first pin a1', the second pin a2', the third pin K1 'and the fourth pin K2'.
For one LED chip 112, the connection circuit 113 applies a current to the first light emitting chip 1121L through the first pin a1 'and the second pin a2', and the connection circuit 113 applies a current to the second light emitting chip 1121R through the third pin K1 'and the fourth pin K2'.
Further, referring to fig. 2 and 3 as appropriate, the connection circuit 113 includes four connection terminals of a first connection terminal a1, a second connection terminal a2, a third connection terminal K1 and a fourth connection terminal K2, each of which is led out to connect a controller of the display device, and the controller adjusts a first current applied to the first light emitting chip 1121L and a second current applied to the second light emitting chip 1121R through the four connection terminals.
The connection circuit 113 is connected to the LED dies 112 in the manner shown in fig. 2, and referring to the pins of the LED dies in fig. 3, in the first direction a, the first pin a1 'of the first LED die 112 is connected to the first connection terminal a1, the third pin K1' of the first LED die 112 is connected to the third connection terminal K1, the second pin a2 'of the last LED die 112 is connected to the second connection terminal a2, the fourth pin K2' of the last LED die 112 is connected to the fourth connection terminal K2, and in the first direction a, the first pin a1 'of each LED die 112 of the backlight source 11 is connected to the second pin a2' of the previous LED die 112, and the fourth pin K2 'of each LED die 112 is connected to the third pin K1' of the next LED die 112.
Thus, the first light emitting chips of the respective LED particles are connected in series with each other, and the same first current is applied; the second light emitting chips of the respective LED particles are connected in series with each other, and the same second current is applied. With the connection method of the LED particles and the connection circuit in the backlight source provided in this embodiment, the first current and the second current are input to the LED particles through the same connection terminals a1, a2, K1, and K2, the connection method of the circuit is simple, and the number of terminals of the backlight source 11 connected to the display device controller is small.
It should be noted that the traces from the pins of the LED particles 112 to the connection circuit 113 shown in fig. 2 are only used to indicate the connection relationship, and the present application does not limit the positions of the traces, and the connection from the pins to the terminals of the connection circuit can be implemented on the flexible circuit board 111.
The above embodiments of the backlight source provided by the present invention also provide a backlight module, which includes any one of the above backlight sources. Specifically, fig. 5 is an exploded view of the backlight module and the structure thereof provided in this embodiment, and in an alternative embodiment, referring to fig. 5, the backlight module includes any one of the backlight sources 11 and the optical module, wherein the optical module includes a light guide plate 121, a diffusion sheet 122, a first light-adding sheet 123, a second light-adding sheet 124, a light-shielding adhesive 125, and a PET release protective film 126 fixedly adhered on the light-shielding adhesive 125.
By adopting the backlight module provided by the embodiment, the LED particles of the backlight source in the backlight module are provided with two independent cavities, each cavity is respectively provided with the light emitting chip and the fluorescent mixture, the chromaticity of the fluorescent mixture of different cavities is different, the two light emitting chips apply current independently, and the proportion of the current applied by the two light emitting chips is adjustable, so that the purpose of adjusting the chromaticity of the LED particles is realized by adjusting the proportion of the first current to the second current, the liquid crystal panel with different chromaticity specifications can be matched, and when the chromaticity of the liquid crystal panel drifts, a 3gamma program does not need to be adjusted, the penetration rate and the response speed of the liquid crystal panel can be improved.
Fig. 6 is a schematic structural diagram of a display device 90 according to an embodiment of the present invention, where the display device includes a display panel 91 and a housing 92, where the housing forms an accommodating space for accommodating the display panel 91, and the housing 92 may be rigid or flexible, which is not limited in this respect. Fig. 6 illustrates a display device by taking a mobile phone as an example, but it should be understood that the display device provided in the embodiment of the present invention may be other display devices with a display function, such as a computer, a television, and a vehicle-mounted display device, and the present invention is not limited thereto. The backlight module in the display device may adopt any one of the backlight modules provided in the embodiments of the present invention, which has the beneficial effects of the backlight module provided in the embodiments of the present invention, and specific descriptions of the backlight source and the backlight module in the above embodiments may be specifically referred to, and the detailed description of the embodiments is not repeated herein.
According to the embodiment, the backlight source, the backlight module and the display device disclosed by the invention have the following beneficial effects:
the LED particles of the backlight source are provided with two independent cavities, each cavity is respectively provided with a light-emitting chip and a fluorescent mixture, the chromaticities of the fluorescent mixtures of different cavities are different, currents are respectively applied to the two light-emitting chips, the chromaticity of the LED particles can be adjusted by adjusting the current proportion applied by the two light-emitting chips, the backlight module is matched with the liquid crystal panels with different chromaticity specifications, in addition, when the chromaticity drift occurs to the liquid crystal panels, 3gamma programs do not need to be adjusted, the penetration rate and the response speed of the liquid crystal panels can be improved, in addition, the two cavities are packaged in the same LED particles, the light mixing distance of the two cavities is short, and the problem of chromatic aberration between two kinds of light with different chromaticities is.
Although some specific embodiments of the present invention have been described in detail by way of examples, it should be understood by those skilled in the art that the above examples are for illustrative purposes only and are not intended to limit the scope of the present invention. It will be appreciated by those skilled in the art that modifications may be made to the above embodiments without departing from the scope and spirit of the invention. The scope of the invention is defined by the appended claims.

Claims (12)

1. A backlight source, comprising:
a plurality of LED particles, wherein the LED particles comprise: the fluorescent lamp comprises a first cavity, a second cavity, a first luminescent chip and a first fluorescent mixture which are mutually independent, and a second luminescent chip and a second fluorescent mixture which are arranged in the first cavity, wherein the first luminescent chip and the second luminescent chip are the same, the second fluorescent mixture and the first fluorescent mixture both comprise fluorescent powder, the fluorescent powder in the first fluorescent powder mixture and the fluorescent powder in the second fluorescent powder mixture are made of the same material, and the light generated by the second fluorescent mixture and the light generated by the first fluorescent mixture have different chromaticities; and
and the connecting circuit is respectively connected with the first light-emitting chip and the second light-emitting chip and is used for applying a first current to the first light-emitting chip and applying a second current to the second light-emitting chip, wherein the proportion of the first current to the second current is adjustable.
2. The backlight source of claim 1, wherein the first and second phosphor mixtures each comprise a phosphor and a colloidal material, wherein:
the concentration of the fluorescent powder in the first fluorescent mixture is different from that of the fluorescent powder in the second fluorescent mixture; and/or
The chromaticity of the phosphor in the first phosphor mixture is different from the chromaticity of the phosphor in the second phosphor mixture.
3. The backlight source of claim 1, wherein the phosphor is a silicate or yttrium aluminum garnet crystal.
4. The backlight source of claim 1,
the chromaticity of the light produced by the first fluorescent mixture having a first chromaticity coordinate on a chromaticity diagram and the chromaticity of the light produced by the second fluorescent mixture having a second chromaticity coordinate on the chromaticity diagram;
the difference between the abscissa of the first chromaticity coordinate and the abscissa of the second chromaticity coordinate is equal to or greater than 0.005 and equal to or less than 0.02, and the difference between the ordinate of the first chromaticity coordinate and the ordinate of the second chromaticity coordinate is equal to or greater than 0.005 and equal to or less than 0.02.
5. The backlight source of claim 4, wherein the first and second light emitting chips are blue light emitting chips, the abscissa of the first chromaticity coordinate is 0.3 to 0.5, the ordinate of the first chromaticity coordinate is 0.4 to 0.6, the abscissa of the second chromaticity coordinate is 0.08 to 0.18, and the ordinate of the second chromaticity coordinate is 0.15 to 0.3.
6. The backlight source of claim 4,
the distance between the point marked by the first chromaticity coordinate and a preset white point on the chromaticity diagram is a first distance, and the distance between the point marked by the second chromaticity coordinate and the preset white point is a second distance;
the ratio of the first current to the second current is equal to the ratio of the second distance to the first distance.
7. The backlight source of claim 1,
the LED particle further comprises a first fixing piece arranged in the first cavity and a second fixing piece arranged in the second cavity, the first fixing piece is provided with a first pin and a second pin, the second fixing piece is provided with a third pin and a fourth pin, and the first pin, the second pin, the third pin and the fourth pin are respectively connected with the connecting circuit;
the first light-emitting chip is fixed on the first fixing piece, a first end of the first light-emitting chip is connected with the first pin, and a second end of the first light-emitting chip is connected with the second pin;
the second light-emitting chip is fixed on the second fixing piece, a first end of the second light-emitting chip is connected with the third pin, a second end of the second light-emitting chip is connected with the fourth pin, and the first end of the first light-emitting chip, the second end of the first light-emitting chip, the first end of the second light-emitting chip and the second end of the second light-emitting chip are sequentially arranged in the first direction.
8. The backlight source of claim 7,
the backlight source further comprises a flexible circuit board, the LED particles are arranged on the flexible circuit board along the first direction, and the flexible circuit board comprises the connecting circuit.
9. The backlight source of claim 8,
the connection circuit comprises a first connection terminal, a second connection terminal, a third connection terminal and a fourth connection terminal;
in the first direction, a first pin of a first LED particle is connected with the first connecting terminal, a third pin of the first LED particle is connected with the second connecting terminal, a second pin of a last LED particle is connected with the third connecting terminal, and a fourth pin of the last LED particle is connected with the fourth connecting terminal;
in the first direction, in each of the LED particles of the backlight source, except for the first LED particle and the last LED particle, the first pin of each LED particle is connected to the second pin of the previous LED particle, and the fourth pin of each LED particle is connected to the third pin of the next LED particle.
10. The backlight source of claim 8, wherein the LED particles comprise a shelf forming the first cavity and the second cavity.
11. A backlight module comprising the backlight source of any one of claims 1 to 10.
12. A display device, comprising: a display panel and a backlight module as claimed in claim 11.
CN201710610768.4A 2017-07-25 2017-07-25 Display device, backlight module and backlight source Active CN107219683B (en)

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CN109993114B (en) * 2019-03-29 2021-01-22 京东方科技集团股份有限公司 Grain identification display device and grain identification method thereof
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CN114023275B (en) * 2021-11-29 2022-09-27 Tcl华星光电技术有限公司 Driving method and driving device of backlight module

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CN102124263A (en) * 2008-06-25 2011-07-13 克里公司 Solid state lighting devices including light mixtures
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