Backlight panels

[0001] This application is a continuation application of U.S. patent application Ser. No. 18/037,761, filed on May 18, 2023, which is a US national phase application based upon an International Application No. PCT/CN2023/078861, filed on Feb. 28, 2023, which claims priority to Chinese Patent Application No. 202310123854.8, filed on Feb. 10, 2023. The disclosures of the aforementioned applications are incorporated herein by reference in their entireties.

[0002] The present disclosure relates to the field of display technologies, and in particular, to backlight panels.

[0003] In a backlight module of a micro light-emitting diode (micro-LED for short) display screen having an irregular shape, micro-LEDs are generally arranged at equal intervals, so a large dark area is reserved at an irregular edge. Thus, in a power-on state, an area provided with the LEDs is brighter and an area provided without any LED is darker, which may result in poor optical performance of nonuniform luminance, so that the display screen cannot properly display contents, with optical interference and distortion. In another aspect, when the LEDs in partial areas need to be adjusted as a whole, the LEDs located at the irregular edge cannot be adjusted, resulting in poor uniformity of the whole panel and deteriorated optical specifications of the display screen.

[0004] Embodiments of the present disclosure provide a backlight panel, including: a substrate comprising a first light-emitting area and a second light-emitting area; a plurality of first light-emitting devices arranged, in rows and in columns, in the first light-emitting area; and a plurality of second light-emitting devices arranged, in rows and in columns, in the second light-emitting area.

[0005] The first light-emitting area overlaps a center of the backlight panel, the second light-emitting area is located on a side of the first light-emitting area, a boundary of the second light-emitting area close to the first light-emitting area coincides with a boundary of the first light-emitting area to form a first coincident boundary, and a boundary of the second light-emitting area away from the first light-emitting area coincides with a boundary of the backlight panel to form a second coincident boundary;

[0006] The first light-emitting devices and the second light-emitting devices have the same row direction and column direction. In the row direction, each of the second light-emitting devices has a distance from another adjacent one of the second light-emitting devices. The distance between at least one of the second light-emitting devices closest to the second coincident boundary and another adjacent one of the second light-emitting devices in the row direction is less than a distance between any two adjacent ones of the first light-emitting devices in the row direction.

[0024] The technical solutions in the embodiments of the present disclosure will be clearly and completely described with reference to the accompanying drawings in the embodiments of the present disclosure. Obviously, the described embodiments merely indicate a part of the embodiments of the present disclosure, but not all the embodiments. Based on the embodiments in the present disclosure, all other embodiments obtained by those skilled in the art without creative work fall into the protection scope of the present disclosure. Additionally, it should be understood that the specific embodiments described herein are merely intended to illustrate and interpret the invention and are not intended to limit the invention. In the present disclosure, without contrary statement, orientational terms such as “up” and “down” are normally used to refer to up and down of the device in actual use or operation, specifically the orientations shown in the drawings; and “inside” and “outside” refer to contours of the device.

[0025] Backlight panels provided in the embodiments of the present disclosure will be introduced in detail below. It should be noted that an order of description of the following embodiments is not intended to indicate the preferred order of embodiments.

[0026] Referring to FIG. 1 and FIG. 2, the embodiments of the present disclosure provide a backlight panel 100, including a substrate 10, a plurality of first light-emitting units 21, and one or more second light-emitting units 22.

[0027] The substrate 10 includes one or more first light-emitting areas 10a and one or more second light-emitting areas 10b, and the second light-emitting areas 10b are located on at least one side of the first light-emitting areas 10a. A boundary of each second light-emitting area 10b coincides with a boundary of one of the first light-emitting areas 10a to form a coincident boundary ch. The first light-emitting area 10a includes a first axial direction M and a second axial direction N perpendicular to each other. The second light-emitting areas 10b each further include an irregular boundary yx located on a side of the coincident boundary ch away from the first light-emitting area 10a. An extending direction of the irregular boundary yx intersects each of the first axial direction M and the second axial direction N.

[0028] The plurality of first light-emitting units 21 are arranged, in rows along the first axial direction M and in columns along the second axial direction N, in the one or more first light-emitting areas 10a. The first light-emitting units 21 each include at least two first light-emitting devices 211.

[0029] The one or more second light-emitting units 22 are disposed in the one or more second light-emitting areas 10b. The second light-emitting units 22 each include one or more second light-emitting devices 221.

[0030] An area of each of the second light-emitting units 22 is less than an area of the first light-emitting unit 21.

[0031] It should be noted that the area of the first light-emitting unit 21 refers to an occupied area of the corresponding first light-emitting unit 21, and the area of the second light-emitting unit 22 refers to an occupied area of the corresponding second light-emitting unit 22.

[0032] Herein, the occupied area refers to a sum of areas of the light-emitting devices and areas therebetween. In the embodiment, the light-emitting devices refer to the first light-emitting devices 211 and the second light-emitting devices 221.

[0033] In the embodiment I of the present disclosure, the second light-emitting units each having a smaller occupied area are provided, so irregular light-emitting areas (referring to the second light-emitting areas) each having a smaller area can be provided with the foregoing second light-emitting devices, thereby increasing a space utilization rate of the irregular light-emitting areas, enhancing luminance of the irregular light-emitting areas, and then improving uniformity of overall luminance of the panel.

[0034] Optionally, all of the first light-emitting devices 211 in each first light-emitting unit 21 are configured to emit light at same time. All of the second light-emitting devices 221 in each second light-emitting unit 22 are configured to emit light at same time. Each of the first light-emitting units 21 and the second light-emitting units 22 is configured to emit light independently, thereby achieving regionalization control of luminous of the backlight panel 100.

[0035] In condition of regionalization luminous, an area (referring to an irregular area) adjacent to the irregular boundary yx has a smaller area and is irregular, in which the first light-emitting unit 21 having a large occupied area and a rectangular pattern cannot be arranged, so the second light-emitting units 22 each having a small occupied area and a suitable layout pattern are arranged in the irregular areas (referring to the second light-emitting areas 10b), thereby reducing a risk of low luminance of the irregular areas.

[0036] Optionally, the first light-emitting devices 211 and the second light-emitting devices 221 may each be a micro-LED, a mini-LED, or other small LED device.

[0037] Optionally, the irregular boundary may be an oblique boundary or an arc boundary. The arc boundary may be a circular arc boundary or a non-circular arc boundary.

[0038] For example, as shown in FIG. 1 and FIG. 2, a combination of the irregular boundaries yx includes first oblique boundaries xb1 and second oblique boundaries xb2, and the second oblique boundaries xb2 are each connected to one corresponding first oblique boundary xb1. A plurality of second light-emitting areas 10b (those are irregular areas) are defined along extending directions of the first oblique boundaries xb1 and the second oblique boundary xb2. Some second light-emitting areas 10b each include a part of the first oblique boundary xb1, and some second light-emitting area 10b each include a part of the second oblique boundary xb2. The first light-emitting area 10a is disposed on a side of the second light-emitting area 10b away from its irregular boundary yx.

[0039] For example, as shown in FIG. 3 and FIG. 4, a combination of the irregular boundaries yx includes arc boundaries. A plurality of second light-emitting areas 10b (those are irregular areas) are defined along extending directions of the arc boundaries. The second light-emitting area 10b each include a part of the arc boundary. The first light-emitting area 10a is disposed on a side of the adjacent second light-emitting area 10b away from its irregular boundary yx.

[0040] For example, as shown in FIG. 5 and FIG. 6, a combination of the irregular boundaries includes a circular arc boundary. A plurality of second light-emitting areas 10b (those are irregular areas) are defined along an extending direction of the circular arc boundary. The second light-emitting areas 10b each include a part of the circular arc boundary. The first light-emitting area 10a is disposed on a side of the second light-emitting area 10b away from its irregular boundary yx.

[0041] Optionally, a number of the second light-emitting devices 221 in each second light-emitting unit 22 is less than a number of the first light-emitting devices 211 in each first light-emitting unit 21.

[0042] In other words, the number of the second light-emitting devices 221 in the second light-emitting unit 22 relatively decreases, so as to reduce the occupied area of the foregoing second light-emitting unit 22, and change the layout pattern of the foregoing second light-emitting devices 221. Thus, the second light-emitting unit 22 is suitable for the second light-emitting area 10b (that is the irregular area), thereby increasing the luminance of the second light-emitting area 10b.

[0043] Optionally, the second light-emitting unit 22 may also be adjusted to suit corresponding irregular boundary yx, such as by adjusting a distance between adjacent second light-emitting units 22 thereof, and/or, by adjusting an arrangement direction of the second light-emitting devices 221 thereof. For example, the second light-emitting unit 22 includes a series of second light-emitting devices 221 adjacent to the irregular boundary yx, a virtual line for connecting respective centers of the series of second light-emitting devices 221 extends in a direction same with the extending direction of the irregular boundary yx.

[0044] Optionally, the first light-emitting unit 21 includes a first length in the first axial direction M and a second length in the second axial direction N.

[0045] At least a part of the second light-emitting area 10b has a length in the first axial direction M less than the first length, and/or, at least a part of the second light-emitting area 10b has a length in the second axial direction N less than the second length.

[0046] In other words, a size of the second light-emitting area 10b is correspondingly less than a size of the first light-emitting unit 21, so the first light-emitting unit 21 cannot be arranged in the second light-emitting area 10b. Thus, according to a change in the size of the second light-emitting area 10b, a size and a pattern of the second light-emitting unit 22 therein may be accordingly adjusted to suit the second light-emitting area 10b.

[0047] For example, the second light-emitting area 10b having a larger area may be provided with a larger number of the second light-emitting devices 221 therein, and the second light-emitting area 10b having a smaller area may be provided with a smaller number of the second light-emitting devices 221 therein.

[0048] In addition, according to a pattern of the second light-emitting area 10b, a layout pattern of the second light-emitting devices 221 may be different to suit the second light-emitting area 10b. For example, when the second light-emitting area 10b is a triangle with a narrow top and a wide bottom or similar to the foregoing triangle, a layout pattern including one upper second light-emitting device 221 and two lower second light-emitting devices 221 may be adopted to suit the second light-emitting area 10b, a layout pattern including one upper second light-emitting device 221 and one lower second light-emitting device 221 may be adopted to suit the second light-emitting area 10b with a further decreased size, and a layout pattern including one second light-emitting device 221 may be adopted to suit the second light-emitting area 10b with a further decreased size.

[0049] Optionally, a distance between every two adjacent first light-emitting devices 211 is equal to a distance between the first light-emitting device 211 and the second light-emitting device 221 adjacent to each other.

[0050] In this way, a layout of the light-emitting devices in the first light-emitting area 10a and a layout of the light-emitting devices in the second light-emitting area 10b tend to be uniform, so as to improve uniformity of overall luminance of the backlight panel 100.

[0051] Referring to FIG. 7 and FIG. 8, a backlight panel 200 is further accordingly provided in the embodiments of the present disclosure. The backlight panel 200 includes a substrate 10, a plurality of first light-emitting devices 211, and a plurality of second light-emitting devices 221.

[0052] The substrate 10 includes one or more first light-emitting areas 10a and one or more second light-emitting areas 10b, and the second light-emitting areas 10b are located on at least one side of the first light-emitting areas 10a. A boundary of each of the second light-emitting area 10b coincides with a boundary of the first light-emitting area 10a to form a coincident boundary ch.

[0053] The plurality of first light-emitting devices 211 are arranged, in rows and in columns, in the one or more first light-emitting areas 10a. The plurality of second light-emitting devices 221 are arranged, in rows and in columns, in the one or more second light-emitting areas 10b. A first distance d1 is defined between every two adjacent second light-emitting devices 221 along a row direction X of the second light-emitting devices 221.

[0054] Herein, the second light-emitting areas 10b each include an irregular boundary yx located on a side of the coincident boundary ch away from the adjacent first light-emitting area 10a. An extending direction of the irregular boundary yx intersects the row direction X, but not perpendicularly.

[0055] The first distance d1 increases along the row direction X from the irregular boundary yx towards the first light-emitting area 10a.

[0056] In the embodiment II of the present disclosure, the second light-emitting devices 221 are arranged in irregular light-emitting areas (referring to the second light-emitting areas), and the first distance d1 between every two adjacent second light-emitting devices 221 is gradually varied, so an arrangement of more second light-emitting devices 221 can be maximized in a part of the second light-emitting area 10b adjacent to the irregular boundary yx, thereby increasing a space utilization rate of the second light-emitting areas 10b, enhancing luminance of the second light-emitting areas, and in turn improving uniformity of overall luminance of the panel.

[0057] It can be understood that the first distance d1 increases along the row direction X from the irregular boundary yx towards the first light-emitting area 10a. In other words, a distribution density of the second light-emitting devices 221 is larger since closer to the irregular boundary yx. In this way, a small area at the irregular boundary yx can be provided with the second light-emitting devices 221 to improve a luminous rate at the irregular boundary yx. At the same time, luminance of the backlight panel 200 at edge areas (referring to the second light-emitting areas) can be further improved according to gradually varied distribution density. Thus, uniformity of overall luminance of the panel is improved.

[0058] Optionally, the first light-emitting devices 211 and the second light-emitting devices 221 may each be a micro-LED, a mini-LED, or other small LED device.

[0059] Optionally, the one or more second light-emitting areas 10b each include a gradient subarea b1 and a non-gradient subarea b2 arranged along a column direction Y of the second light-emitting devices 221.

[0060] In the gradient subarea b1, the first distance d1 increases along the row direction X from the irregular boundary yx towards the first light-emitting area 10a.

[0061] In the non-gradient subarea b2, the first distance d1 is constant along the row direction X from the irregular boundary yx towards the first light-emitting area 10a.

[0062] It should be noted that an arrangement of the second light-emitting devices 221 in the non-gradient subarea b2 is simple, and the distance between every two adjacent second light-emitting devices 221 is constant. The luminance of the second light-emitting areas 10b can be well adjusted according to the foregoing design of the non-gradient subareas b2, so as to avoid a risk of the second light-emitting areas 10b being too bright compared to the first light-emitting area 10a. That is, that a luminance of the non-gradient subarea b2 is less than a luminance of the gradient subarea b1 is avoided. Optionally, a distribution density of the second light-emitting devices 221 in the non-gradient subarea b2 is less than a distribution density of the second light-emitting devices 221 in the gradient subarea b1.

[0063] Optionally, a second distance d2 is defined between every two adjacent first light-emitting devices 211 in the row direction X. In the non-gradient subarea b2, the first distance d1 is equal to the second distance d2.

[0064] The first distance d1 is equal to the second distance d2 in the non-gradient subarea b2, so a distribution density of the first light-emitting devices 211 in the first light-emitting area 10a is equal to a distribution density of the second light-emitting devices 221 in the non-gradient subarea b2. Thus, luminance in per unit area of the first light-emitting area 10a and luminance in per unit area of the non-gradient subarea b2 are same, thereby improving uniformity of overall luminance of the panel.

[0065] In the embodiment, as shown in FIG. 8, a combination of the irregular boundaries yx includes first oblique boundaries xb1 and second oblique boundaries xb2, and the second oblique boundaries xb2 are each connected to one corresponding first oblique boundary xb1. The second light-emitting area 10b includes the first oblique boundary xb1 and the second oblique boundary xb2. The first light-emitting area 10a is located at a side of the second light-emitting areas 10b away from the irregular boundary yx.

[0066] Herein, the gradient subarea b1 is correspondingly defined at a connecting portion of the first oblique boundary xb1 and the second oblique boundary xb2. The gradient subarea b1 includes a part of the first oblique boundary xb1 and a part of the second oblique boundary xb2.

[0067] Because a pattern at the connecting portion of the first oblique boundary xb1 and the second oblique boundary xb2 is seriously deformed, the gradient subarea b1 is accordingly designed, so as to maximize an arrangement of light-emitting devices in the irregular area, thereby improving luminance of the irregular area.

[0068] In some embodiments, as shown in FIG. 9 and FIG. 10, a combination of the irregular boundaries yx includes arc boundaries. The second light-emitting area 10b includes the arc boundary. The first light-emitting area 10a is located at a side of the second light-emitting area 10b away from the irregular boundary yx.

[0069] In some embodiments, as shown in FIG. 11 and FIG. 12, a combination of the irregular boundaries includes a circular arc boundary. The second light-emitting area 10b includes the circular arc boundary. The first light-emitting area 10a is located at a side of the second light-emitting area 10b away from the irregular boundary yx.

[0070] Herein, the second light-emitting area 10b is shaped as a circular ring, and the first light-emitting area 10a is located at an inner side of the second light-emitting area 10b.

[0071] It should be noted that, for arrangements of the gradient subarea b1 and the non-gradient subarea b2 in the second light-emitting area 10b, the second light-emitting area 10b may be first simulated as the non-gradient subarea b2, and when a part of the area at the irregular boundary yx presents as a large empty space, the foregoing non-gradient subarea b2 corresponding to the large empty space may be changed to the gradient subarea b1. The foregoing design can be applied in any shaped backlight panels 200.

[0072] Referring to FIG. 13 and FIG. 14, a backlight panel 300 is further accordingly provided in the embodiments of the present disclosure. The backlight panel 300 includes a substrate 10 and a plurality of light-emitting units 20.

[0073] The substrate 10 includes a light-emitting area fa, and the light-emitting area fa includes an irregular boundary yx.

[0074] The plurality of light-emitting units 20 are arranged in rows. A plurality of rows of the light-emitting units 20 are arranged in the light-emitting area fa. The light-emitting units 20 each include at least three light-emitting devices 2a.

[0075] An extending direction of the irregular boundary yx intersects a row direction X of the light-emitting units 20, but not perpendicularly. The light-emitting units 20 in each row closest to the irregular boundary yx are defined as edge units by. Among the edge units by, a series of light-emitting devices 2a closest to the irregular boundary yx are arranged along the extending direction of the irregular boundary yx.

[0076] In the embodiment III of the present disclosure, the light-emitting device 2a arranged along the extending direction of the irregular boundary yx are provided to adaptively suit the area adjacent to the irregular boundary yx, so as to improve a space utilization rate and improve luminance at the irregular boundary yx, and improve uniformity of overall luminance of the backlight panel 300.

[0077] Optionally, the irregular boundary yx may include oblique boundaries. Respective centers of a series of light-emitting devices 2a in the edge units by those are closest to the oblique boundary are in a straight line having a slope equal to a slope of the oblique boundary.

[0078] Optionally, referring to FIG. 15 and FIG. 16, in some embodiments, the irregular boundary yx includes arc boundaries. Respective centers of a series of light-emitting devices 2a in the edge unit by those are closest to the arc boundary are in an arc line having a radian equal to a radian of the arc boundary corresponding to the edge unit by.

[0079] Optionally, the light-emitting devices 2a may each be a micro-LED, a mini-LED, or other small LED device.

[0080] Optionally, the plurality of light-emitting units 20 include first light-emitting units 20a and second light-emitting units 20b. The first light-emitting units 20a and the second light-emitting units 20b are alternately arranged along a row direction X of the light-emitting units 20. Each of the edge units by in each row of the light-emitting units 20 is one of the first light-emitting units 20a and the second light-emitting units 20b.

[0081] The light-emitting units 20 in each row are arranged in a first sub-row 2b1 and a second sub-row 2b2. The first sub-row 2b1 and the second sub-row 2b2 are arranged along a direction perpendicular to the row direction X. The first light-emitting units 20a each include at least three light-emitting devices 2a. The second light-emitting units 20b each include at least three light-emitting devices 2a.

[0082] A number of the light-emitting devices 2a in the first light-emitting unit 20a gradually decreased along a direction from the first sub-row 2b1 to the second sub-row 2b2. A number of the light-emitting devices 2a in the second light-emitting unit 20b is gradually increased along a direction from the first sub-row 2b1 to the second sub-row 2b2

[0083] In the embodiment, an occupied area of the first light-emitting unit 20a and an occupied area of the second light-emitting unit 20b are complementary in the row direction X, so as to increase a space utilization rate of the light-emitting area fa.

[0084] Optionally, when a pattern of the first light-emitting unit 20a is provided with a narrow top and a wide bottom, a pattern of the second light-emitting unit 20b is provided with a narrow bottom and a wide top. For example, when a virtual line for connecting centers of outmost light-emitting devices 2a in the first light-emitting unit 20a defines a regular triangle, a virtual line for connecting centers of outmost light-emitting devices 2a in the second light-emitting unit 20b defines an inverted triangle. For example, when a virtual line for connecting centers of outmost light-emitting devices 2a in the first light-emitting unit 20a defines a regular trapezoid, a virtual line for connecting centers of outmost light-emitting devices 2a in the second light-emitting unit 20b defines an inverted trapezoid.

[0085] Optionally, among the first light-emitting unit 20a and the second light-emitting unit 20b adjacent to each other, a number of the light-emitting devices 2a in the first sub-row 2b1 is equal to a number of the light-emitting devices 2a in the second sub-row 2b2.

[0086] Optionally, among the first light-emitting unit 20a and the second light-emitting unit 20b adjacent to each other, a distance between every two adjacent light-emitting devices 2a in the row direction X is constant.

[0087] It can be understood that, the light-emitting devices 2a with different numbers are provided in corresponding sub-rows to realize space complementarity in the row direction X in the embodiment. Correspondingly, in some embodiments, the light-emitting devices 2a with different distribution densities may be provided in corresponding sub-rows to realize space complementarity in the row direction X.

[0088] Optionally, the light-emitting area fa includes first light-emitting areas fa1 and second light-emitting areas fa2 arranged along the extending direction of the irregular boundary yx, and the first light-emitting area fa1 is located at a side of an adjacent second light-emitting area fa2.

[0089] The first light-emitting units 20a and the second light-emitting units 20b are disposed in the first light-emitting areas fa1. The plurality of light-emitting units 20 further include a plurality of third light-emitting units 20c arranged in rows. At least one row of the third light-emitting units 20c are disposed in each second light-emitting area fa2.

[0090] The third light-emitting units 20c each include one or more light-emitting devices 2a, and the light-emitting devices 2a are arranged in a matrix.

[0091] In can be understood that, space patterns of areas of the light-emitting area fa corresponding to different parts of the irregular boundary yx will also change according to change of the irregular boundary yx. Therefore, light-emitting devices 2a arranged in different layout patterns are configured corresponding to various space patterns, so as to suit the irregular areas, thereby in turn achieving that the luminance at the irregular boundary yx is similar to the luminance of other areas.

[0092] In the embodiment, that the light-emitting devices 2a in the second light-emitting area fa2 are arranged in the matrix achieves effect of transiting two adjacent first light-emitting areas fa1. On the one hand, the areas at the irregular boundary yx can be reasonably suited according to a shape of the irregular boundary yx; on the other hand, the luminescent of the light-emitting area fa can be balanced.

[0093] Optionally, the first light-emitting areas fa1 and the second light-emitting areas fa2 are alternately arranged along the extending direction of the irregular boundary yx. In this way, the luminescent of the light-emitting area fa is further balanced.

[0094] In some embodiments, the light-emitting area fa may be a layout of the first light-emitting areas fa1.

[0095] Optionally, a distance between every two adjacent light-emitting devices 2a in the first sub-row 2b1 is equal to a distance between every two adjacent light-emitting devices 2a in the second sub-row 2b2. In this way, the light-emitting devices 2a can be uniformly arranged in the first light-emitting area fa1, so as to improving uniformity of luminance thereof.

[0096] Optionally, a distance between every two adjacent light-emitting devices 2a in the first light-emitting area fa1 corresponding to the row direction X is defined as a first distance d1. A distance between every two adjacent light-emitting devices 2a in the second light-emitting area fa2 corresponding to the row direction X is defined as a second distance d2. The first distance d1 is equal to the second distance d2. In this way, the light-emitting devices 2a can be uniformly arranged in the light-emitting area fa, so as to improving uniformity of luminance thereof.

[0097] In embodiment III of the present disclosure, the light-emitting devices 2a arranged along the extending direction of the irregular boundary yx are provided to adaptively suit the area adjacent to the irregular boundary yx, so as to improve space utilization rate of improve luminance at the irregular boundary yx, and improve uniformity of overall luminance of the backlight panel 300.

[0098] Optionally, in some second light-emitting areas fa2, the second distance d2 decreases in a direction from the irregular boundary yx towards a center of the corresponding second light-emitting area fa2. Therefore, the space pattern of the second light-emitting area fa2 can be more subtly adjusted, so as to improve space utilization rate of the second light-emitting area fa2. In addition, a gradient design is achieved in this way, so as to further adjust the uniformity of luminance of the light-emitting area fa.

[0099] The backlight panels according to some embodiments of the present disclosure have been described above in detail. The illustration of the above embodiments is intended only to assist in understanding the technical solutions and core ideas of the present disclosure. Those skilled in the art can make various changes and modifications without departing from the spirit of the present disclosure. Therefore, the content of the specification is not intended to limit the present disclosure.