CN114236908A - Direct type backlight module structure - Google Patents
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- CN114236908A CN114236908A CN202111544445.2A CN202111544445A CN114236908A CN 114236908 A CN114236908 A CN 114236908A CN 202111544445 A CN202111544445 A CN 202111544445A CN 114236908 A CN114236908 A CN 114236908A
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- 239000000758 substrate Substances 0.000 claims abstract description 24
- 239000011295 pitch Substances 0.000 claims abstract description 12
- 239000011159 matrix material Substances 0.000 claims description 3
- 238000000034 method Methods 0.000 abstract description 11
- 230000007704 transition Effects 0.000 abstract description 11
- 230000008859 change Effects 0.000 abstract description 6
- 230000008569 process Effects 0.000 abstract description 3
- 239000011324 bead Substances 0.000 description 17
- 239000004973 liquid crystal related substance Substances 0.000 description 9
- 230000000694 effects Effects 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 5
- 230000009286 beneficial effect Effects 0.000 description 2
- 239000011521 glass Substances 0.000 description 2
- 238000005457 optimization Methods 0.000 description 2
- 238000005192 partition Methods 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 238000010923 batch production Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000004020 luminiscence type Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 238000012858 packaging process Methods 0.000 description 1
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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
- G02F1/133—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
- G02F1/133611—Direct backlight including means for improving the brightness uniformity
Abstract
The invention relates to the field of backlight modules, and discloses a direct type backlight module structure, which comprises a substrate, wherein an LED light source is arranged on the substrate; the LED pitches in the longitudinal arrangement from the edge area to the central area are P1, P2, P3, P.,. Pn in sequence, the LED pitch in the longitudinal arrangement central area is P0, and the pitches are adjusted so that P1< P2< P3<. Pn < P0; the LED spacing in the direction from the edge area to the central area in the transverse arrangement is D1, D2, D3, D. & Dn in sequence, the LED spacing in the central area in the transverse arrangement is D0, and the spacing is adjusted so that D1< D2< D3< & gt. & lt Dn < D0; because the LED spacing of the edge area is smaller than that of the central area, the brightness of the edge area is improved, and the brightness transition is uniform due to the gradual change of the LED spacing of the edge area. The direct type backlight module structure only needs to specifically optimize and design the LED spacing of the edge area of the substrate, can be adjusted according to different application requirements, and can improve the brightness uniformity of the direct type backlight module without an additional process.
Description
Technical Field
The invention relates to the field of backlight modules, in particular to a direct type backlight module structure.
Background
In the current technological age, various electronic devices, such as televisions, computers, panels, and the like, need to be equipped with a display module having a display function; one commonly used display module is an LCD, i.e. a liquid crystal display module: the liquid crystal display module does not emit light and needs a backlight module to provide a light source; the liquid crystal display module is characterized in that a liquid crystal box is placed in parallel glass substrates, a TFT (thin film transistor) is arranged on a lower glass substrate, and the rotation direction of liquid crystal molecules is controlled through the change of TFT signals and voltage so as to control the display effect of the liquid crystal display module; the display effect of the liquid crystal display module is greatly dependent on the backlight module.
The backlight module comprises a side-in type backlight module and a direct type backlight module, wherein the side-in type backlight module is simple in structure, but large in size and not beneficial to being applied to light and thin equipment; the direct type backlight module can realize the partition display, the size of an LED chip is smaller and smaller along with the maturity of the technology, the chip interval is reduced accordingly, and the performance of the direct type backlight module is better and better at present.
Mini LEDs, also known as sub-millimeter light emitting diodes, have a single Mini LED chip size of around 100 microns. Recently, mini LED technology has become mature and is also used in a direct type backlight module. The liquid crystal display module with the mini LED direct type backlight module is matched with a partition display technology, high-definition display can be achieved, the color gamut, the brightness and the contrast are higher, and the module is thinner and thinner; along with the technology is continuously mature, the price of the mini LED is reduced, the cost performance is more advantageous compared with that of an OLED display module, the high-temperature stability of the mini LED is better than that of the OLED, and the mini LED backlight is expected to become one of mainstream technologies in the high-end display field in the coming years. The interval of LED lamp pearl in each region on conventional straight following formula backlight unit base plate is even unanimous, because the existence of backlight plate edge and edge zone do not have LED luminescence unit outside, when being used as the light source of liquid crystal display module assembly, can lead to the edge zone luminance of module to be lower than central zone, the phenomenon "black edge" commonly called promptly, influences the image display effect of module, for this reason we have proposed a straight following formula backlight unit structure.
Disclosure of Invention
Technical problem to be solved
Aiming at the defects of the prior art, the invention provides a direct type backlight module structure, which solves the problems.
(II) technical scheme
In order to achieve the above purpose, the invention provides the following technical scheme: the utility model provides a straight following formula backlight unit structure, includes the base plate, set up multiunit LED light source on the base plate, realize electrical connection through the base plate between the LED. The LED backlight module comprises a substrate, a plurality of groups of LED light sources and a plurality of groups of LED light sources, wherein the plurality of groups of LED light sources are arranged on the substrate in a matrix manner, the number of the longitudinal arrangement and the number of the transverse arrangement are usually not less than ten, and the interval between the LED light sources on the substrate is specially optimized and designed, so that the backlight module can emit light uniformly.
Preferably, the distance between the LED light sources in the central region of the backlight module structure is fixed, and the distance between the LED light sources in the edge region is specially optimized.
Preferably, the pitches of the plurality of groups of LED light sources which are longitudinally arranged from the outermost edge area to the central area are P1, P2, P3,. and Pn in sequence, the distance between the LED light sources which are longitudinally arranged in the central area is P0, and the pitches are adjusted so that P1< P2< P3<. > < Pn < P0.
The distances among the multiple groups of LED light sources which are transversely arranged from the outermost edge region to the central region are D1, D2, D3, and Dn in sequence, the distance between the light sources which are transversely arranged in the central region is D0, and the distances are adjusted so that D1< D2< D3< > Dn < D0.
Optionally, the values of P1, P2, P3, etc. are changed in a gradient manner, such as P1 ═ 2.1mm, P2 ═ 2.2mm, P3 ═ 2.3mm, P4 ═ 2.4mm, etc.
Optionally, the values D1, P2, D3, etc. are graded, for example, D1 ═ 2.1mm, D2 ═ 2.2mm, D3 ═ 2.3mm, D4 ═ 2.4mm, etc.
Preferably, the gradient of the distance between the LED light sources in the edge area of the backlight module structure can be adjusted according to different brightness uniformity application requirements.
(III) advantageous effects
Compared with the prior art, the invention provides a direct type backlight module structure, which has the following beneficial effects:
1. according to the direct type backlight module structure, the brightness of the edge area can be improved by reducing the LED distance of the edge area, so that the brightness difference between the edge area and the central area meets the application requirement.
2. This straight following formula backlight unit structure through making the regional multiunit LED interval of edge change gradually rather than the sudden change, can realize the even transition of different regional luminance, satisfies the requirement of luminance uniformity.
3. The direct type backlight module structure only needs to design the space between the LED lamp beads in the edge area of the substrate of the backlight module in advance and correspondingly modify the position of the LED bonding pad on the substrate, and other process flows are the same as those of the conventional direct type backlight module; but also does not increase the process complexity, and is convenient for actual mass production.
4. The direct type backlight module structure has extremely high application flexibility, and can adjust and set different edge region LED lamp bead interval gradient gradually according to different brightness consistency requirements of the backlight module so as to realize uniform brightness transition of each region of the backlight module and eliminate the phenomenon of 'black edge'.
Drawings
FIG. 1 is a conventional direct type backlight module;
FIG. 2 is a bottom-down backlight module with reduced LED pitch in the edge area;
FIG. 3 is a direct type backlight module with gradually reduced spacing between multiple groups of LED beads in the edge area.
In the figure: 1. a substrate; 2. an LED light source.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1-3, a direct type backlight module structure includes a substrate 1, a plurality of LED light sources 2 are disposed on the substrate 1, and the LED light sources 2 are electrically connected to each other through the substrate; the multiple groups of LED light sources 2 are arranged in a matrix on the substrate 1, and the number of the longitudinal arrangement and the number of the transverse arrangement are usually not less than ten groups.
According to the conventional arrangement of the direct backlight module shown in fig. 1, the LED light sources 2 are arranged in rows and columns on the upper surface of the substrate 1, and the LED light sources 2 are electrically connected to each other through the substrate; the distance between the LED light source 2 at the most edge region of the longitudinal arrangement and the adjacent LED light source 2 is P1, and the distance between the two LED light sources 2 at the most middle of the longitudinal arrangement is P0; the distance between the LED light source 2 in the outermost edge region of the transverse arrangement and the adjacent LED light source 2 is D1, and the distance between the two LED light sources 2 in the middle of the transverse arrangement is D0; wherein: since there are no additional LED light sources except the edge of the substrate, P1-P0 and D1-D0, the display brightness in the edge area of the backlight module is slightly darker than that in the center area under the same pitch of the LED light sources 2.
In summary, because the luminance of straight following formula backlight unit depends on the size of LED lamp pearl interval on the base plate to a certain extent, generally, the lamp pearl interval is less, and luminance is higher, so will improve backlight unit edge area's luminance, the LED interval that can corresponding edge area that reduces, as shown in fig. 2: LED light sources 2 distributed in rows and columns are arranged on the upper surface of the substrate 1, and the LED light sources 2 are electrically connected through the substrate; in fig. 2, the distance between the LED light source 2 at the most peripheral region of the longitudinal arrangement and the adjacent LED light source 2 is P1, and the distance between the other LED light sources 2 of the longitudinal arrangement is P0;
in fig. 2, the distance between the LED light source 2 in the edge-most region of the lateral arrangement and the adjacent LED light source 2 is D1, and the distance between the LED light sources 2 in the other lateral arrangement regions is D0;
in order to improve the brightness of the area where the longitudinally arranged most edge LED light sources 2 of the backlight module are located, the value of P1 is adjusted to make P1< P0, and the value of P1 is adjusted according to the actual brightness display difference between the most edge area and the central area of the backlight module to make the brightness of the area where the longitudinally arranged most edge LED light sources 2 are located substantially consistent with the brightness of the central area;
in order to improve the brightness of the region where the most edge LED light sources 2 are transversely arranged of the backlight module, the value of D1 is adjusted to make D1< D0, and the value of D1 is adjusted according to the actual brightness display difference between the most edge region and the central region of the backlight module, so that the brightness of the region where the most edge LED light sources 2 are transversely arranged is basically consistent with the brightness of the central region;
however, the arrangement of the LED light sources 2 shown in fig. 2 may cause a new problem, that is, the brightness of the edge region of the backlight module may be brighter than the adjacent region of the edge region, that is, a new problem of inconsistent brightness occurs.
In the backlight module structure proposed by the present invention, not only the pitch of the LED light sources 2 in a row or a column of the edge region is changed, but also the LED light sources 2 in the edge region are rearranged to make their pitch gradually change rather than abruptly change, as shown in the LED arrangement mode shown in fig. 3: the distances among the multiple groups of LED light sources 2 which are longitudinally arranged from the outermost edge region to the central region are P1, P2, P3 and the like in sequence, the distance among the LED light sources 2 which are longitudinally arranged from the central region is P0, the distances among the multiple groups of LED light sources 2 which are transversely arranged from the edge region to the central region are D1, D2, D3 and the like in sequence, and the distance among the LED light sources 2 which are transversely arranged from the central region is D0;
in order to improve the brightness of the area where the LED light sources 2 in the edge area are longitudinally arranged, the value of P1 is adjusted to make P1< P0, and the value of P1 is adjusted according to the actual brightness display difference to make the brightness of the area where the LED light source 2 in the edge area is located basically consistent with the brightness of the central area; then, the value of P2 is adjusted to make P2 and P1 close, i.e. P1< P2< P0, while P2 ≈ P1, so that the brightness of the area where the three LED columns at the edge are located is relatively uniform; similarly, the value of P3 is adjusted so that P3 is close to P2, i.e., P1< P2< P3< P0, and at the same time, P3 ≈ P2, so that the brightness of the area where the four outermost LED columns are located is relatively uniform; by analogy, by adjusting P1, P2, P3,. and Pn such that P1< P2< P3<. > < Pn and Pn ≈ P0, the luminance transition in the area where the plurality of LED light source 2 columns of the edge area are located can be made uniform. The brightness of the edge area of the backlight plate is improved, the black edge is eliminated, the brightness transition of each area is uniform, and the brightness difference can be controlled by adjusting the distance between LED lamp beads in the edge area;
the values of P1, P2, P3, etc. may be selected to be graded, for example: p0 ═ 2.5 mm; p1 ═ 2.1 mm; p2 ═ 2.2 mm; p3 ═ 2.3 mm; the P4 is 2.4mm, the distance between the LED lamp beads in the edge area arranged longitudinally is gradually changed from 2.1mm (P1) to 2.5mm (P0), and the LED lamp beads are not directly changed from 2.1mm to 2.5mm, so that better brightness transition can be realized;
in order to improve the brightness of the area where the LED light sources 2 in the edge area are transversely arranged, the value of D1 is adjusted to enable D1 to be smaller than D0, and the value of D1 is adjusted according to the actual brightness display difference to enable the brightness of the area where the LED light source 2 row in the edge area is located to be basically consistent with the brightness of the central area; then, the value of D2 is adjusted so that D2 is close to D1, i.e., D1< D2< D0, and at the same time, D2 ≈ D1, so that the brightness of the area where the three LED light source 2 rows at the edge are located is relatively uniform; similarly, the value of D3 is adjusted so that D3 is close to D2, i.e., D1< D2< D3< D0, and at the same time, D3 ≈ D2, so that the brightness of the area where the four LED light source 2 rows at the very edge are located is relatively uniform; by analogy, by adjusting D1, D2, D3, and Dn such that D1< D2< D3< > Dn and Dn ≈ D0, the luminance transition of the area where the plurality of LED light source 2 rows in the edge area are located can be made uniform, so as to substantially coincide with the luminance of the central area;
optionally, the values of D1, D2, D3, etc. are graded, such as: d0 ═ 2.5 mm; d1 ═ 2.1 mm; d2 ═ 2.2 mm; d3 ═ 2.3 mm; d4 is 2.4mm, and the LED lamp bead spacing in the edge region is gradually changed from 2.1mm (D1) to 2.5mm (D0), rather than directly changing from 2.1mm to 2.5mm, so that better brightness transition can be realized.
A design method for LED spacing of edge area of direct type backlight module structure comprises the following steps:
it is known that:
in the substrate of the conventional LED, the LED lamp bead column spacing on the substrate is P0, and the line spacing is D0;
generally, the smaller the distance between the LED lamp beads is, the brighter the backlight area where the LED lamp beads are located;
in the conventional backlight substrate, the brightness of the edge area is lower than that of the central area;
except for the edge area, the brightness consistency of the backlight module is standard: when the LED is normally illuminated, the brightness difference of different areas is +/-x, and the value of x is determined according to the application requirement of an actual product, such as 1%.
The research method comprises the following steps:
a control variable method: the LED lamp pearl of fixed central region is listed as interval P0, reduces most marginal region's LED lamp pearl and is listed as interval P1, promotes backlight unit marginal region's luminance to compare with central region's luminance: if the brightness of the edge area is low, the lamp bead spacing P1 of the edge area is reduced properly; if the edge area is too bright, the distance P1 between the lamp beads in the edge area is properly increased; when the brightness uniformity standard of the backlight module is met, the initial value of P1 is determined.
An iterative optimization method: set up LED lamp pearl and be listed as interval gradient: from the marginal area toward central zone, the lamp pearl interval is respectively: p1, P2, P3., Pn, and P1< P2< P3. < Pn ≈ P0; the P0 is a fixed value, the initial value of P1 can be obtained by a control variable method, and then the value of P2 is adjusted according to the brightness consistency standard of the backlight module, so that the brightness of the area where the three LED rows in the marginal area meet the requirement, and the initial value of P2 is obtained; similarly, the value of P3 is adjusted to make the brightness of the area where the four LED columns are located in the edge area meet the requirement, and the initial value of P3 is obtained; and adjusting the value of Pn in sequence to enable the brightness difference between the area where the n +1 LED columns in the edge area are located and the central area to meet the requirement, and obtaining the initial value of Pn.
Similarly, the initial value of the bead spacing (i.e., D1, D2, D3.., Dn) of the LED rows in the edge region can be adjusted by the above method.
By using the control variable and the iterative optimization method, the brightness of the edge area of the backlight module can be improved on the premise of meeting the brightness consistency standard of the backlight module, the black edge phenomenon is eliminated, and the display effect of the backlight module can be better.
In addition, the technical scheme has universality and flexibility: universality: the method can be universal for backlight modules with different sizes, different lamp beads and different lamp bead intervals, and the required effect can be realized only by the steps; flexibility: different LED lamp bead spacing gradients can be set according to a specific backlight module brightness consistency standard; if the requirement on the brightness consistency is high, the gradient quantity of the LED lamp bead intervals can be set to be more.
In general, the pitches P1 and D1 of the rows or columns of the LED light sources 2 in the most edge region are reduced, so that the brightness in the edge region of the backlight board is improved; the space between the multiple groups of LED light source 2 columns in the edge area is gradually transited from P1 to P0, the space between the multiple groups of LED light source 2 rows in the edge area is gradually transited from D1 to D0 instead of abrupt transition from P1 to P0 and abrupt transition from D1 to D0, and uniform brightness transition from the edge area to the central area is realized; according to the scheme, the black edges of the direct type backlight module can be eliminated, the whole backlight module is uniform in luminous brightness, the corresponding LED intervals of the edge area are designed before packaging according to the requirement of the backlight module for brightness uniformity, the complexity of the packaging process cannot be increased, and the direct type backlight module is convenient to use in batch production.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (7)
1. The utility model provides a straight following formula backlight unit structure, includes base plate (1), set up multiunit LED light source (2) on base plate (1), realize electrical connection, its characterized in that through the base plate between LED light source (2): the LED light sources (2) are arranged on the substrate (1) in a matrix mode, and the number of the longitudinally arranged LED light sources and the number of the transversely arranged LED light sources are not less than ten.
2. The direct type backlight module structure according to claim 1, wherein: the LED light sources (2) in the central area of the backlight module structure are equidistant in transverse and longitudinal intervals.
3. The direct type backlight module structure according to claim 1, wherein: the distance between the multiple groups of LED light sources (2) in the edge area of the backlight module structure is smaller than that between the LED light sources (2) in the central area.
4. The direct type backlight module structure according to claim 3, wherein: the distance between the plurality of groups of LED light sources (2) in the backlight module structure from the edge area to the central area is gradually increased until the distance is equal to the distance between the LED light sources (2) in the central area.
5. The direct type backlight module structure according to claim 3, wherein: the pitches of the LED light sources (2) which are longitudinally arranged from the outermost edge area to the central area are P1, P2, P3,. and Pn in sequence, the distance between the LED light sources (2) in the central area is P0, and the pitches are adjusted so that P1< P2< P3<. > < Pn < P0.
The distances among the LED light sources (2) which are transversely arranged from the outermost edge region to the central region are D1, D2, D3, and Dn in sequence, the distance between the LED light sources (2) in the central region is D0, and the distances are adjusted to enable D1< D2< D3< > Dn < D0.
6. The direct type backlight module structure according to claim 5, wherein: the values of P1, P2, P3, etc. are gradually changed, and may be, for example, P1-2.1 mm, P2-2.2 mm, P3-2.3 mm, and P4-2.4 mm.
7. The direct type backlight module structure according to claim 5, wherein: the values of D1, D2, D3, etc. are gradually changed, for example, D1-2.1 mm, D2-2.2 mm, D3-2.3 mm, and D4-2.4 mm.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115728994A (en) * | 2022-12-20 | 2023-03-03 | 京东方科技集团股份有限公司 | Backlight module and display device |
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| CN203385964U (en) * | 2013-06-19 | 2014-01-08 | 彩虹集团公司 | Bottom-lighting liquid crystal display screen with light-emitting diode (LED) backlight |
| CN111727403A (en) * | 2019-01-21 | 2020-09-29 | 京东方科技集团股份有限公司 | Direct type backlight source, manufacturing method thereof and display device |
| CN112505966A (en) * | 2020-12-02 | 2021-03-16 | Tcl华星光电技术有限公司 | Backlight module and liquid crystal display panel |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115728994A (en) * | 2022-12-20 | 2023-03-03 | 京东方科技集团股份有限公司 | Backlight module and display device |
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