Patent Description:
A backlight is generally composed of multiple light bars and multiple reflectors corresponding thereto. The light bar is composed of a PCB board, a lamp bead and a lens. The lens is in a shape of a container, which is inverted on the PCB board and covers the lamp bead on the PCB board. The lens is provided with weld legs of the lens at the bottom portion, which are fixed on PCB board with curing adhesive, so as to complete the connection between the lens and the PCB board. The PCB board and the reflector are laminated, and the reflector is provided with a special-shaped assembly hole for accommodating the lamp bead and the lens. Due to an influence of installation accuracy, the PCB board and the reflector are prone to misalignment, resulting in the weld leg of the lens and a side edge of the special-shaped assembly hole being too close.

At present, there is such a problem, the reflector will focus light emitted by the lamp bead, and will emit a lot of heat. In addition, the reflector is close to the PCB board, since the PCB board generates heat during operation, the reflector will be also heated up accordingly. After heated up, the reflector will expand to a certain extent, and will stretch when expanding. When the PCB board and the reflector are misaligned, the reflector will cut the weld legs of the lens, which will lead to unstable connection between the lens and the PCB board, and may even cause the lens to fall off from the PCB board, thus affecting the lighting effect of the backlight. <CIT> discloses a reticulated reflective material, comprising a plurality of strands of a reflective material attached to one another at bridging regions and separable from one another between the bridging regions to provide expandable openings in the reflective material in at least one of the longitudinal direction and the width direction. The expandable nature of the reflective material provides varying levels of brightness. <CIT> discloses a hole structure for fixing a forming sheet in a backlight assembly including a reflection plate, wherein the forming sheet is provided at an edge with a plurality of hole portions, e.g., with a shape of a square, and the hole portions are integrally connected to the scrap sheet. <CIT> discloses a reflection piece of a lamp box, wherein the reflection piece is used to reflect the light emitted by an LED in a direct backlight module. The reflection piece comprises a connecting surface between the first sub-side reflection sheet and/or the third sub-side reflection sheet, and the second sub-side reflection sheet, is provided with a cutout and the cutout may be a rhombus. The cutout is used to allow reflective sheet to have gaps to absorb stress during the bending process, and prevent the reflective piece from being partially debonded and arched relative to the backplane when a curved display backlight is applied.

At least a part of embodiments of the present disclosure provides a reflector and a backlight having the same, so as to at least solve a technical problem that special-shaped assembly holes of conventional reflectors have poor fault tolerance and the lens is prone to fall off from the PCB board. The claimed invention is defined in the appended claims.

According to one aspect of one of embodiments of the present disclosure, a reflector is provided with a special-shaped assembly hole, wherein the special-shaped assembly hole has an irregular rhombus for accommodating the lamp bead and the lens. The special-shaped assembly hole penetrates the reflector. The special-shaped assembly hole comprises a center, a first included angle and a second included angle opposite to each other, two sides forming the first included angle are respectively a first upper side and a second upper side, and two sides forming the second included angle are respectively a first lower side and a second lower side. The special-shaped assembly hole further comprises a first limiting side, a second limiting side, a third limiting side and a fourth limiting side. The first limiting side is parallel to the first upper side, and a perpendicular distance from the first limiting side to the center is less than that from the first upper side to the center. The second limiting side is parallel to the first lower side, and a perpendicular distance from the second limiting side to the center is less than that from the first lower side to the center. The third limiting side is parallel to the second upper side, and a perpendicular distance from the third limiting side to the center is less than that from the second upper side to the center. The fourth limiting side is parallel to the second lower side, and a perpendicular distance from the fourth limiting side to the center is less than that from the second lower side to the center. The special-shaped assembly hole further comprises a first connection side, a second connection side, a third connection side and a fourth connection side. The first limiting side is connected with the first upper side through the first connection side. The second limiting side is connected with the first lower side through the second connection side. The third limiting side is connected with the second upper side through the third connection side. The fourth limiting side is connected with the second lower side through the fourth connection side.

Optionally, the special-shaped assembly hole is of axisymmetric shape, the special-shaped assembly hole is symmetrical along a horizontal axis passing through the center, the special-shaped assembly hole is symmetrical along a vertical axis passing through the center, the center is a center of the special-shaped assembly hole, and the horizontal axis and the vertical axis are perpendicular to each other in a plane where the reflector is located.

Optionally, a vertex of the first included angle and a vertex of the second included angle are on the vertical axis.

Optionally, the special-shaped assembly hole further comprises a first arc-shaped side and a second arc-shaped side opposite to each other, the first arc-shaped side and the second arc-shaped side are symmetrical along the horizontal axis passing through the center, and are symmetrical along the vertical axis passing through the center, and the first arc-shaped side and the second arc-shaped side protrude toward the center. The first limiting side is connected with an end of the first arc-shaped side close to the first included angle. The second limiting side is connected with an end of the first arc-shaped side close to the second included angle. The third limiting side is connected with an end of the second arc-shaped side close to the first included angle. The fourth limiting side is connected with an end of the second arc-shaped side close to the second included angle.

Optionally, a backlight is provided, comprising a light bar and the above-mentioned reflector. The light bar comprises a PCB board, a lamp bead and a lens. The lens comprises a weld leg of the lens, the PCB board is provided with an insertion slot corresponding to the weld leg of the lens, and the weld leg of the lens is inserted into the insertion slot. The lamp bead is arranged on the PCB board, and the lens covers the lamp bead and is bonded to the PCB board. The reflector is partially overlapped with the PCB board, the lamp bead and the lens are located in the special-shaped assembly hole, and the first arc-shaped side and the second arc-shaped side are clamped with the lens. The weld leg of the lens corresponds to the first included angle and the second included angle.

Optionally, the special-shaped assembly hole has an irregular rhombus.

In at least a part of embodiments of the present disclosure, through arranging gaps of the first upper side, the second upper side, the first lower side and the second lower side relative to the first limiting side, the second limiting side, the third limiting side and the fourth limiting side in a direction away from the center, when the PCB board and the reflector are misaligned, there can be still a space between the weld legs of the lens and the side edge of the special-shaped assembly hole. When the reflector expands, the weld legs of the lens will not be easily cut, thereby reducing the probability of the lens falling off from the PCB board, and improving the fault tolerance effect of the special-shaped assembly hole, which solves the technical problem that the fault tolerance effect of the special-shaped assembly hole of the conventional reflector is not good, and the lens easily falls off the PCB board.

The realization of the purpose, functional characteristics and advantages of the present disclosure will be further described with reference to the accompanying drawings in conjunction with the embodiments.

It should be understood that the specific embodiments described herein are only used to explain the present disclosure, and are not intended to limit the present disclosure.

Referring to <FIG>, the present disclosure provides a reflector <NUM>. The reflector <NUM> is provided with a special-shaped assembly hole <NUM>, and the special-shaped assembly hole <NUM> penetrates the reflector <NUM>. The special-shaped assembly hole <NUM> is of axisymmetric shape, the special-shaped assembly hole <NUM> is symmetrical along a horizontal axis passing through a center, the special-shaped assembly hole <NUM> is symmetrical along a vertical axis passing through the center, the center is a center of the special-shaped assembly hole <NUM>, and the horizontal axis and the vertical axis are perpendicular to each other in a plane where the reflector <NUM> is located. The special-shaped assembly hole <NUM> has an irregular rhombus. The special-shaped assembly hole <NUM> comprises a first included angle and a second included angle opposite to each other, and a vertex of the first included angle and a vertex of the second included angle are on the vertical axis. Two sides forming the first included angle are respectively a first upper side <NUM> and a second upper side <NUM>, and two sides forming the second included angle are respectively a first lower side <NUM> and a second lower side <NUM>. The special-shaped assembly hole <NUM> further comprises a first arc-shaped side <NUM> and a second arc-shaped side <NUM> opposite to each other, the first arc-shaped side <NUM> and the second arc-shaped side <NUM> are symmetrical along the horizontal axis passing through the center, and are symmetrical along the vertical axis passing through the center, and the first arc-shaped side <NUM> and the second arc-shaped side <NUM> protrude toward the center. The special-shaped assembly hole <NUM> further comprises a first limiting side <NUM>, a second limiting side <NUM>, a first connection side <NUM> and a second connection side <NUM>. The first limiting side <NUM> is connected with an end of the first arc-shaped side <NUM> close to the first included angle, and the first limiting side <NUM> is connected with the first upper side <NUM> through the first connection side <NUM>. The second limiting side <NUM> is connected with an end of the first arc-shaped side <NUM> close to the second included angle, and the second limiting side <NUM> is connected with the first lower side <NUM><NUM> through the second connection side <NUM>. The first limiting side <NUM> is parallel to the first upper side <NUM>, and a perpendicular distance from the first limiting side <NUM> to the center is less than that from the first upper side <NUM> to the center. The second limiting side <NUM> is parallel to the first lower side <NUM>, and a perpendicular distance from the second limiting side <NUM> to the center is less than that from the first lower side <NUM> to the center. The special-shaped assembly hole <NUM> further comprises a third limiting side <NUM>, a fourth limiting side <NUM>, a third connection side <NUM> and a fourth connection side <NUM>. The third limiting side <NUM> is connected with an end of the second arc-shaped side <NUM> close to the first included angle, and the third limiting side <NUM> is connected with the second upper side <NUM> through the third connection side <NUM>. The fourth limiting side <NUM> is connected with an end of the second arc-shaped side <NUM> close to the second included angle, and the fourth limiting side <NUM> is connected with the second lower side <NUM> through the fourth connection side <NUM>. The third limiting side <NUM> is parallel to the second upper side <NUM>, and a perpendicular distance from the third limiting side <NUM> to the center is less than that from the second upper side <NUM> to the center. The fourth limiting side <NUM> is parallel to the second lower side <NUM>, and a perpendicular distance from the fourth limiting side <NUM> to the center is less than that from the second lower side <NUM> to the center.

through arranging gaps of the first upper side <NUM>, the second upper side <NUM>, the first lower side <NUM> and the second lower side <NUM> relative to the first limiting side <NUM>, the second limiting side <NUM>, the third limiting side <NUM> and the fourth limiting side <NUM> in a direction away from the center, when the PCB board and the reflector are misaligned, there can be still a space between the weld legs of the lens <NUM> and the side edge of the special-shaped assembly hole <NUM>. When the reflector <NUM> expands, the weld legs of the lens <NUM> will not be easily cut, thereby reducing the probability of the lens <NUM> falling off from the PCB board, and improving the fault tolerance effect of the special-shaped assembly hole <NUM>, which solves the technical problem that the fault tolerance effect of the special-shaped assembly hole <NUM> of the conventional reflector <NUM> is not good, and the lens <NUM> easily falls off the PCB board.

Thereinto, the vertical axis is along a vertical direction of the PCB board, and the horizontal axis is a horizontal direction of the PCB board. The lens <NUM> comprises a cylindrical part and a rectangular sheet part arranged at the bottom end of the cylindrical part, and the cylindrical part is arranged in the middle of the rectangular sheet part. The weld legs of the lens <NUM> are arranged on a side of the rectangular sheet part facing away from the cylindrical part. When connecting, the two corners of the rectangular sheet part are in the vertical direction and the other two corners are in the horizontal direction. The design that the first arc-shaped side <NUM> and the second arc-shaped side <NUM> protrude inwards makes them easier to be deformed by force, which can make it easier for the reflector to realize clamp with the lens <NUM> in the horizontal direction.

Optionally, in some embodiments, a gap between the first limiting side <NUM> and the first upper side <NUM> is greater than or equal to <NUM>. A gap between the second limiting side <NUM> and the first lower side <NUM> is greater than or equal to <NUM>. A gap between the third limiting side <NUM> and the second upper side <NUM> is greater than or equal to <NUM>. A gap between the fourth limiting side <NUM> and the second lower side <NUM> is greater than or equal to <NUM>. The base material of the reflector <NUM> is PET, and under an environment in high temperature and high humidity, of which an expansion rate can reach <NUM>%. The current reflector <NUM> with a common size has a cutting distance of less than <NUM> after thermal expansion. When the gap is greater than or equal to <NUM>, it is possible to effectively prevent the reflector <NUM> from expanding and cutting the weld legs of the lens <NUM>, so as to improve the fault tolerance effect of the special-shaped assembly hole <NUM>.

Optionally, in some embodiments, a length of the first limiting side <NUM> is less than or equal to that of the first upper side <NUM>, a length of the second limiting side <NUM> is less than or equal to that of the first lower side <NUM>, a length of the third limiting side <NUM> is less than or equal to that of the second upper side <NUM>, and a length of the fourth limiting side <NUM> is less than or equal to that of the second lower side <NUM>. The larger the proportion of the first upper side <NUM>, the first lower side <NUM>, the second upper side <NUM> and the second lower side <NUM> relative to the corresponding first limiting side <NUM>, the second limiting side <NUM>, the third limiting side <NUM> and the fourth limiting side <NUM> is, the higher the probability of corresponding to the weld legs of the lens <NUM> are, thereby improving the fault tolerance effect of the special-shaped assembly hole <NUM>.

Optionally, in some embodiments, a length of the first limiting side <NUM> is <NUM>/<NUM> of a length of the first upper side <NUM>, a length of the second limiting side <NUM> is <NUM>/<NUM> of a length of the first lower side <NUM>, a length of the third limiting side <NUM> is <NUM>/<NUM> of a length of the second upper side <NUM>, and a length of the fourth limiting side <NUM> is <NUM>/<NUM> of a length of the second lower side <NUM>.

The present disclosure further provides a backlight, comprising a light bar and the above-mentioned reflector <NUM>. The light bar comprises a PCB board <NUM>, a lamp bead and a lens <NUM>. The lens <NUM> comprises weld legs of the lens <NUM>, the PCB board <NUM> is provided with insertion slots corresponding to the weld legs of the lens <NUM>, and the weld legs of the lens <NUM> are inserted into the corresponding insertion slots. The lamp bead is arranged on the PCB board <NUM>, and the lens <NUM> covers the lamp bead and is bonded to the PCB board <NUM>. The reflector <NUM> is partially overlapped with the PCB board <NUM>, the lamp bead and the lens <NUM> are located in the special-shaped assembly hole <NUM>, and the first arc-shaped side <NUM> and the second arc-shaped side <NUM> are clamped with the lens <NUM>. The weld legs of the lens <NUM> correspond to the first included angle and the second included angle.

Through arranging gaps of the first upper side <NUM>, the second upper side <NUM>, the first lower side <NUM> and the second lower side <NUM> relative to the first limiting side <NUM>, the second limiting side <NUM>, the third limiting side <NUM> and the fourth limiting side <NUM> in a direction away from the center, when the PCB board <NUM> and the reflector are misaligned, there can be still a space between the weld legs of the lens <NUM> and the side edge of the special-shaped assembly hole <NUM>. When the reflector <NUM> expands, the weld legs of the lens <NUM> will not be easily cut, thereby reducing the probability of the lens <NUM> falling off from the PCB board <NUM>, and improving the fault tolerance effect of the special-shaped assembly hole <NUM>, which solves the technical problem that the fault tolerance effect of the special-shaped assembly hole <NUM> of the conventional reflector <NUM> is not good, and the lens <NUM> easily falls off the PCB board <NUM>.

Optionally, the lens <NUM> is provided with four weld legs of the lens <NUM>, and the four weld legs of the lens <NUM> respectively have one-to-one correspondence with two sides of the first included angle and two sides of the second included angle. That is, the four weld legs of the lens <NUM> correspond to the first upper side <NUM>, the second upper side <NUM>, the first lower side <NUM> and the second lower side <NUM>, respectively. When the reflector <NUM> expands, the weld legs of the lens <NUM> will not be easily cut, thereby reducing the probability of the lens <NUM> falling off from the PCB board <NUM> and improving the fault tolerance effect of the special-shaped assembly hole <NUM>.

Optionally, the first upper side <NUM>, the second upper side <NUM>, the first connection side <NUM>, the second connection side <NUM>, the first lower side <NUM>, the second lower side <NUM>, the third connection side <NUM> and the fourth connection side <NUM> are laminated with the PCB board <NUM>. This manner of opening holes ensures that an area of a hollowed-out part of the backplane does not increase, and an area of hollowed-out in the PCB board <NUM> of the light bar is increased. Thus, while improving the fault tolerance effect of the special-shaped assembly holes <NUM>, a light effect will not be affected due to coating with white ink on the surface of the PCB.

The beneficial effect of the present disclosure is that: through arranging gaps of the first upper side <NUM>, the second upper side <NUM>, the first lower side <NUM> and the second lower side <NUM> relative to the first limiting side <NUM>, the second limiting side <NUM>, the third limiting side <NUM> and the fourth limiting side <NUM> in a direction away from the center, when the PCB board <NUM> and the reflector are misaligned, there can be still a space between the weld legs of the lens <NUM> and the side edge of the special-shaped assembly hole <NUM>. When the reflector <NUM> expands, the weld legs of the lens <NUM> will not be easily cut, thereby reducing the probability of the lens <NUM> falling off from the PCB board <NUM>, and improving the fault tolerance effect of the special-shaped assembly hole <NUM>, which solves the technical problem that the fault tolerance effect of the special-shaped assembly hole <NUM> of the conventional reflector <NUM> is not good, and the lens <NUM> easily falls off the PCB board <NUM>.

Claim 1:
A reflector (<NUM>) for a backlight, wherein the reflector (<NUM>) is provided with a special-shaped assembly hole (<NUM>) for accommodating a lamp bead and a lens, and the special-shaped assembly hole (<NUM>) penetrates the reflector (<NUM>); wherein
the special-shaped assembly hole (<NUM>) comprises a center, and characterized in that it further comprises a first included angle and a second included angle opposite to each other, two sides forming the first included angle are respectively a first upper side (<NUM>) and a second upper side (<NUM>), and two sides forming the second included angle are respectively a first lower side (<NUM>) and a second lower side (<NUM>);
the special-shaped assembly hole (<NUM>) further comprises a first limiting side (<NUM>), a second limiting side (<NUM>), a third limiting side (<NUM>) and a fourth limiting side (<NUM>);
the special-shaped assembly hole (<NUM>) further comprises a first connection side (<NUM>), a second connection side (<NUM>), a third connection side (<NUM>) and a fourth connection side (<NUM>);
wherein the first limiting side (<NUM>) is parallel to the first upper side (<NUM>), and a perpendicular distance from the first limiting side (<NUM>) to the center is less than that from the first upper side (<NUM>) to the center, the first limiting side (<NUM>) is connected with the first upper side (<NUM>) through the first connection side (<NUM>);
the second limiting side (<NUM>) is parallel to the first lower side (<NUM>), and a perpendicular distance from the second limiting side (<NUM>) to the center is less than that from the first lower side (<NUM>) to the center, the second limiting side (<NUM>) is connected with the first lower side (<NUM>) through the second connection side (<NUM>);
the third limiting side (<NUM>) is parallel to the second upper side (<NUM>), and a perpendicular distance from the third limiting side (<NUM>) to the center is less than that from the second upper side (<NUM>) to the center, the third limiting side (<NUM>) is connected with the second upper side (<NUM>) through the third connection side (<NUM>);
the fourth limiting side (<NUM>) is parallel to the second lower side (<NUM>), and a perpendicular distance from the fourth limiting side (<NUM>) to the center is less than that from the second lower side (<NUM>) to the center, the fourth limiting side (<NUM>) is connected with the second lower side (<NUM>) through the fourth connection side (<NUM>).