Backlight module and display device

Disclosed are a backlight module and a display device. The backlight module includes a backplate, a led-bar, a light guide plate and an optical sheet group; wherein the led-bar includes a plurality of light sources disposed towards the light entrance surface of the light guide plate; the light exit surface and the light entrance surface of the light guide plate are adjacent; a portion of the light exit surface of the light guide plate near the light entrance surface is provided with a step structure in which heights of steps gradually decrease in a first direction; the optical sheet group includes a plurality of optical sheets stacked on the side where the light exit surface of the light guide plate is located, and each of the optical sheets is fixed to a corresponding step in the step structure.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is a national stage application of PCT Application No. PCT/CN2021/130918, which is filed on Nov. 16, 2021 and claims the priority to the Chinese patent application No. 202110551010.4, entitled “Backlight Module and Display Device”, filed to the CNIPA on May 18, 2021, the content of which should be regarded as being incorporated herein by reference.

TECHNICAL FIELD

Embodiments of the present disclosure relate to, but are not limited to the technical field of display, specifically to a backlight module and a display device.

BACKGROUND

As a key component of photoelectric display industry, backlight modules can provide stable, high brightness and uniform light for Liquid Crystal Display panel (LCD panel for short), so as to make liquid crystal display panel achieve display effect. With the development of display technology, consumers have increasingly high requirements on the picture quality of display devices. The performance of backlight modules has a great impact on the picture quality of display devices, so there's higher requirements on the performance of the backlight modules.

SUMMARY

The following is a summary of subject matters described herein in detail. The summary is not intended to limit the protection scope of claims.

A backlight module is provided in an embodiment of the present disclosure. The backlight module includes the backplate, a led-bar, the light guide plate and the optical sheet group, wherein the backplate includes a plate body and a baffle disposed at a circumferential edge of the plate body, the light guide plate is disposed at one side of the plate body, the light guide plate has a light exit surface away from the plate body and a light entrance surface adjacent to the light exit surface, the led-bar is disposed at the baffle and includes a plurality of light sources disposed towards the light entrance surface of the light guide plate. A portion of the light exit surface of the light guide plate near the light entrance surface is provided with a step structure in which heights of steps gradually decrease in a first direction. The optical sheet group includes a plurality of optical sheets stacked on the side where the light exit surface of the light guide plate is located, and each of the optical sheets is fixed to a corresponding step in the step structure. The plurality of optical sheets include a first prism sheet. A plurality of first prisms disposed side by side are disposed on a surface of the first prism sheet facing away from the light guide plate. The first prisms extend in a direction perpendicular to the first direction, an edge of the first prism sheet is provided with a notched groove that avoids the step structure, and a gap is provided between a groove wall, which is parallel to the first direction, of the notched groove of the first prism sheet and the step structure, wherein the gap ranges from 0.5 mm to 0.8 mm.

A display device is also provided in an embodiment of the present disclosure, which includes a display panel and the backlight module, wherein the backlight module is disposed on a side of the display panel away from a display side.

Other aspects may be understood upon reading and understanding the drawings and the detailed description.

DETAILED DESCRIPTION

Those of ordinary skills in the art should understand that modifications or equivalent replacements may be made to the technical solutions of the embodiments of the present disclosure without departing from the spirit and scope of the technical solutions of the embodiments of the present disclosure, and should all fall within the scope of the claims of the present disclosure.

As shown inFIG.1, which is a exploded view of a part of a structure of a display device according to some exemplary embodiments, the display device includes an display panel20, a backlight module10disposed on a side of the display panel20away from a display side, a front bezel30and a protect film40. The front bezel30is fixedly connected to the backlight module10by a plurality (four in this example) of screws50and a circumferential edge of the display panel20is fixed between the front bezel30and the backlight module10.

As shown inFIG.2, which is a exploded view of a structure of the backlight module10of the display device inFIG.1according to some exemplary embodiments, the backlight module10may include a backplate11, a led-bar, a reflector sheet13, a light guide plate12, an optical sheet group14, a rubber bezel15, and auxiliary materials such as a light-shielding tape17and a double-sided adhesive foam16. The optical sheet group14may include a first diffuser sheet141, a first prism sheet142, a second prism sheet143, and a second diffuser sheet144which are sequentially stacked on a side where a light exit surface of the light guide plate12is located. The led-bar can be disposed on the backplate11and on a side of the light guide plate12.

FIGS.3ato3dare cross-sectional views of structures at four side edges of the display device inFIG.1according to some exemplary embodiments as shown inFIGS.3ato3d. The display device includes a display panel20, a backlight module disposed on a side of the display panel20away from the display side, and a front bezel30. A circumferential edge of the display panel20is fixed between the front bezel30and the rubber bezel15of the backlight module.

In some exemplary embodiments, as shown inFIGS.3ato3dandFIGS.4to7,FIG.4is a schematic diagram of a structure of the light exit surface of the light guide plate of the backlight module inFIG.2according to some exemplary embodiments,FIG.5ais a schematic diagram of a structure of the light guide plate inFIG.4mating with four optical sheets of the optical sheet group according to some exemplary embodiments,FIG.5bis a schematic diagram of a structure of the light guide plate and a first prism sheet and a second prism sheet of optical sheet group inFIG.5aaccording to some exemplary embodiments,FIG.6is a schematic diagram of a structure of the light guide plate mating with the first prism sheet inFIG.4according to some exemplary embodiments, andFIG.7is a schematic diagram of a structure of the backplate and the led-bar of the backlight module according to some exemplary embodiments. The backlight module includes the backplate11, a led-bar18(shown inFIG.3c), the light guide plate12and the optical sheet group14, wherein the backplate11includes a plate body111and a baffle112disposed at a circumferential edge of the plate body111, the light guide plate12is disposed at one side of the plate body111, the light guide plate12has a light exit surface facing away from the plate body111and a light entrance surface adjacent to the light exit surface, the led-bar18is disposed on the baffle112and includes a plurality of light sources182disposed towards the light entrance surface of the light guide plate12. As shown inFIGS.4to6, a portion of the light exit surface121of the light guide plate12close to the light entrance surface is provided with a step structure122in which heights of steps gradually decrease in a first direction (an X direction in the figure, and the first direction may be a length direction of the light entrance surface of the light guide plate12in some examples). The optical sheet group14includes a plurality of optical sheets stacked on the side where the light exit surface of the light guide plate12is located, and each of the optical sheets is fixed to a corresponding step in the step structure122. The plurality of optical sheets include a first prism sheet142. A plurality of first prisms (V-shaped protrusions shown inFIG.5b) disposed side by side are disposed on a surface of the first prism sheet142facing away from the light guide plate12. The first prisms extend in a direction (Y direction inFIG.5b) perpendicular to the first direction, an edge of the first prism sheet142is provided with a notched groove1421that avoids the step structure122, and a gap d (shown inFIG.6) is provided between a groove wall, which is parallel to the first direction, of the notched groove1421of the first prism sheet142and the step structure122, wherein the gap d ranges from 0.5 mm to 0.8 mm.

In the backlight module according to the embodiment of the present disclosure, as shown inFIGS.4to6, the plurality of optical sheets of the optical sheet group14cooperate with the step structure122provided in the light guide plate12to restrict a movement of the plurality of optical sheets, the step structure122of the light guide plate12is disposed at the portion of the light exit surface121of the light guide plate12close to the light entrance surface, and the height of the steps in the step structure122gradually decreases in the first direction (X direction in the figure). The plurality of optical sheets include a first prism sheet142, and a surface of the first prism sheet142facing away from the light guide plate12is provided with a plurality of first prisms arranged side by side, wherein the first prism extends in a direction (Y direction in the figure) perpendicular to the first direction. An edge of the first prism sheet142is provided with a notched groove1421to avoid the step structure122, and a gap d of 0.5 mm to 0.8 mm is provided between the groove wall, which is parallel to the first direction, of the notched groove1421of the first prism sheet142and the step structure122(shown inFIG.6). Due to the presence of the step structure122on the light guide plate12, part of light emitted by the light source182of the led-bar18is directly incident into the step structure122, and light (indicated by five dashed arrows inFIG.5b) emitted from the step structure122is incident into the first prism sheet142from the groove wall of the notched groove1421of the first prism sheet142. The first prism sheet142has a converging effect on this part of the incident light, which causes the backlight module to produce a bright stripe extending in a direction (Y direction in the figure) perpendicular to the first direction at a position corresponding to the step structure122, causing uneven light output from the backlight module. By providing the gap d of 0.5 mm to 0.8 mm between the groove wall, which is parallel to the first direction, of the notched groove1421of the first prism sheet142and the step structure122, the presence of the gap d reduces the intensity of the light incident from the step structure122into the first prism sheet142, thereby reducing a phenomenon that the light emitted from the backlight module produces the bright stripe at the position corresponding to the step structure122, and improving the uniformity of the light emitted from the backlight module.

In some exemplary embodiments, as shown inFIGS.2,3a-3d, and5b, the optical sheet group14includes the first diffuser sheet141, the first prism sheet142, the second prism sheet143, and the second diffuser sheet144that are sequentially stacked on the light exit surface121of the light guide plate12, wherein a surface of the second prism sheet143facing away from the light guide plate12is provided with a plurality of second prisms (V-shaped protrusions shown inFIG.5b) disposed side by side, and the second prisms extend in a direction parallel to the first direction (X direction inFIG.5b). The first diffuser sheet141and the second diffuser sheet144can uniformly diffuse light, the first prism sheet142can brighten outgoing light in a direction (the Y direction inFIG.5b) perpendicular to the first direction, while the second prism sheet143can brighten the outgoing light in a direction parallel to the first direction (X direction inFIG.5B), and a combination of the first prism sheet142and the second prism sheet143can cause the light exited from the backlight module to converge toward the central viewing angle and have uniform brightness. The first diffuser sheet141, the first prism sheet142, the second prism sheet143and the second diffuser sheet144are used together to improve the brightness and uniformity of the planar outgoing light of the backlight module. In some examples, the thickness of the first diffusion sheet141may be 0.125 mm, the thickness of the first prism sheet142may be 0.152 mm, the thickness of the second prism sheet143may be 0.158 mm, and the thickness of the second diffusion sheet144may be 0.2 mm. In other implementations, positions of the first prism sheet and the second prism sheet may be switched or the second prism sheet may not be provided.

In some exemplary embodiments, as shown inFIG.5a, a surface of the step structure122facing away from the plate body111may be bonded to a plurality of the optical sheets by the light-shielding tape17, the edges of the plurality of the optical sheets are provided with notched grooves to avoid the step structure122. As an example, as shown inFIG.5a, the optical sheet group14includes the first diffuser sheet141, the first prism sheet142, the second prism sheet143and the second diffuser sheet144which are sequentially stacked on the light exit surface121of the light guide plate12. The step structure122includes a first step, a second step, a third step and a fourth step with a height gradually decreasing in the first direction X, wherein the first step, the second step and the third step protrude from the light exit surface121of the light guide plate12, and the fourth step is a groove disposed on the light exit surface121of the light guide plate12. Surfaces of the first step, the second step, the third step and the fourth step facing away from the plate body111are bonded and fixed to the second diffuser sheet144, the second prism sheet143, the first prism sheet142and the first diffuser sheet141, respectively, by the light-shielding tape17. The light-shielding tape17may be a black tape with a thickness of 0.05 mm. The material of the light guide plate12may be polycarbonate (PC).

In some exemplary embodiments, as shown inFIGS.4to6, at least one (two shown inFIG.4) fixing post123may also be disposed on the light exit surface121of the light guide plate12, and each of the optical sheets is provided with a positioning hole inserted and matched with the fixing post123to restrict the movement of each of the optical sheets.

In some exemplary embodiments, as shown inFIGS.3cand7, the led-bar18may include a first circuit board181fixed to the baffle112and a plurality of (e.g.18in this example) light sources182spaced on the first circuit board181, and the plurality of light sources182may be disposed in a row. The light emitted by the plurality of light sources182may be incident from the light entrance surface of the light guide plate12to an inside of the light guide plate12in a side entrance manner and emitted from the light exit surface of the light guide plate12.

In some exemplary embodiments, as shown inFIG.7, the plate body111is in a rectangular shape, and each position on a surface of the plate body111towards the light guide plate12may be provided with a localizer19near four corners, and the localizers19may be in a cuboid shape or an L-shape. The four localizers19may be provided to position the positions of the light guide plate12near the four corners. The material of the localizer19may be an elastic material such as white silastic matrix, the hardness may be 40 degrees, and the compression ratio may be greater than or equal to 60%. For example,FIG.7shows two localizers19located near both ends of one short side of the plate body111, wherein the localizer19adjacent to the led-bar18may be in a rectangular shape and have a thickness of 1.5 mm in a direction parallel to a length of the plate body111, and the localizer19away from the led-bar18may be in an L shape and have a thickness of 1.5 mm in a direction parallel to the length of the plate body111and a thickness of 0.6 mm in a direction perpendicular to the length of the plate body111.

In some exemplary embodiments, as shown inFIGS.3ato3d, the baffle112is disposed around the circumferential sides of the light guide plate12and the plurality of optical sheets, and each of the circumferential edges of the light guide plate12and the plurality of optical sheets have a gap with the baffle112. Thus, when the backplate11is deformed or the like, problems such as deformation and wrinkling caused by contact of the light guide plate12and the optical sheet with the backplate11can be avoided, thereby avoiding affecting the display picture quality.

In some exemplary embodiments, as shown inFIGS.3ato3d, the backlight module may further include a reflector sheet13disposed on a side of the light guide plate12away from the light exit surface, and a circumferential edge of the reflector sheet13may be provided with a flange that is attached on the circumferential side of the light guide plate12and avoids the light entrance surface. In this way, the reflector sheet13can reflect the light emitted from the light guide plate12into the light guide plate12, thereby improving the utilization ratio of the light. In an example of this embodiment, the baffle112of the backplate11may surround the circumferential sides of the light guide plate12, the reflector sheet13, and the optical sheet group14, the circumferential edges of all of the circumferential edges of the light guide plate12, the reflector sheet13, and the optical sheets of the optical sheet group14may be gaps with the baffles112, thereby avoiding wrinkles caused by contact with the backplate11when the backplate11is deformed or the like, thereby avoiding affecting the picture quality of the display panel. The thickness of the reflector sheet13may be 0.188 mm.

In some exemplary embodiments as shown inFIGS.3ato3dandFIG.8,FIG.8is a schematic diagram of a structure of the rubber bezel of the backlight module according to some exemplary embodiments. The backlight module may also include a rubber bezel15that may include a first frame151and a rib152disposed at a circumferential edge of the first frame151, wherein the first frame151may be disposed at a side of the optical sheet group14facing away from the light guide plate12, and the rib152may surround a circumferential side of the baffle112. A surface of the first frame151facing the light exit surface121of the light guide plate12may have a gap with a portion, which is near a circumferential edge, of an optical sheet (which may be the second diffuser sheet in some examples) of the optical sheet group14away from the light guide plate12, Thus, when the optical sheet expands, wrinkling caused by abutment with the first frame151can be avoided. Furthermore, the rib152is disposed around the circumferential side of the rib112so as to facilitate fixing the rubber bezel15to the backplate11by the rib152and the baffle112.

In an example of the present embodiment, as shown inFIGS.7and8, the baffle112may be provided with a plurality of first buckles1121in the circumferential direction, and the rib152is provided with a plurality of first slots1521, the plurality of first slots1521are correspondingly clamped with the plurality of first buckles1121. As an example, there may be eleven first buckles1121, and the baffle112may include two opposite long sides and two opposite short sides, one long side of the baffle112is provided with three first buckles1121, another long side is provided with four first buckles1121, and both short sides of the rim112are each provided with two first buckles1121. As shown inFIGS.3ato3d, the first frame151can be provided with a locating slot, and an end of the baffle112away from the plate body111can be clamped in the locating slot.

A display device is further provided in an embodiment of the disclosure, which includes a display panel and a backlight module according to any embodiment, wherein the backlight module is disposed on a side of the display panel away from a display side.

In some exemplary embodiments, as shown inFIGS.3ato3d, a rubber bezel15of the backlight module includes a first frame151and a rib152disposed at a circumferential edge of the first frame151. The first frame151may surround a circumferential side of a display panel20and support a portion of the display panel20away from a surface of the display side near a circumferential edge. The first frame151may be provided with a support platform1511that may be bonded by a double-sided adhesive foam16. A portion of the display panel20away from the surface of the display side near the circumferential edge may be bonded to the support platform1511by a double-sided adhesive foam16. In this way, a movement of the display panel20can be restricted. Furthermore, since the double-sided adhesive foam16has a certain elastic deformability, heights of the display panel20at different positions after installation can be balanced, and the flatness of the display panel20can be improved, which is beneficial to avoid a problem of light leakage in a dark state (L0 picture) of the display panel20. A compression ratio of foam of the double-sided adhesive foam16may be greater than or equal to 60%. The rubber bezel15can be made of a black PC material, which can avoid a problem of bright lines or shadows around a display image of the display panel20.

In some exemplary embodiments, as shown inFIGS.3ato3d, the display device may further include a front bezel30fixedly connected to the backlight module. The front bezel30may include a second frame31surrounded a circumferential side of the rubber bezel15, and an annular rim32connected to the second frame31and located on a side of the first frame151facing away from the plate body111, wherein the annular rim32can be abutted with the surface of the first frame151facing away from the plate body111and with a portion, near the circumferential edge, of the display surface of the display panel, so that the front bezel30can fix the display panel20.

In an example of the present embodiment, as shown inFIGS.3ato3dandFIG.11,FIG.11is a schematic diagram of a structure of a front bezel of a display device according to some exemplary embodiments, wherein the front bezel30may be connected with a backlight module by screws and may be clamped in a snap-in structure. As an example, a plurality of threaded holes303(shown inFIG.11) may be disposed on the second frame31of the front bezel30in the circumferential direction, and a plurality of threaded holes may be disposed on the rib152of the rubber bezel15and on the baffle112of the backplate11. The front bezel30is fixedly connected to the backlight module by screws provided in the threaded holes303on the second frame31and the threaded holes on the ribs152and the baffle112. Specifications of the threaded hole on the baffle112of the backplate11may be M1.4*P0.3 and the length is 1.1 mm, that is, an internal thread diameter of the threaded hole is 1.4 mm, a thread pitch is 0.3 mm, and a thread length is 1.1 mm. Materials of the front bezel30and the backplate11may both be metal, for example, the material of the front bezel30may be stainless steel, and the material of the backplate11may be aluminum. As shown inFIG.11, the second frame31may be in a rectangular shape, and the second frame31includes opposite first and second bezels and opposite third and fourth bezels, wherein the first and second bezels may be disposed along a length direction of the second frame31, and the third and fourth bezels may be disposed along a width direction of the second frame31. There may be four threaded holes303, the second bezel may be provided with two threaded holes303, and each of the third bezel and the fourth bezel may be provided with one threaded hole303.

In an example of the present embodiment, a plurality of second slots can be disposed on the second frame along the circumferential direction, a plurality of second buckles are disposed on the baffle, and the plurality of second buckles are correspondingly clamped with the plurality of second slots through an avoidance slot disposed on the rib; or/and, the second frame can be provided with a plurality of notched grooves, and the rib is provided with a plurality of limit blocks, and the plurality of limit blocks are correspondingly clamped with the plurality of notched grooves. As an example, as shown inFIG.11, the second frame31may be in a rectangular shape, and the second frame31includes opposite first and second bezels and opposite third and fourth bezels, wherein the first and second bezels may be disposed along a length direction of the second frame31, and the third and fourth bezels may be disposed along a width direction of the second frame31. A plurality of second slots301and a plurality of notched grooves302can also be disposed on the second frame31, wherein the plurality of second slots301may be disposed along the circumferential direction of the second frame31, for example, a number of the second slots301may be 9, the first bezel may be provided with two second slots301, the second bezel may be provided with three second slots301, and each of the third bezel and the fourth bezel may be provided with two second slots301. A plurality of notched grooves302may be disposed on the third bezel and fourth bezel of the second frame31, for example, the number of the notched grooves302may be eight, and the notched grooves302may be disposed at both ends of the third bezel and fourth bezel and at a middle position between the third bezel and fourth bezel. As shown inFIGS.7and8, a plurality of second buckles1122may be disposed on the baffle112of the backplate11, and the plurality of second buckles1122can pass through the avoidance groove1522disposed on the rib152of the rubber bezel15and be clamped with the plurality of second slots301correspondingly. As shown inFIG.8, the two short sides of the rib152of the rubber bezel15are provided with a plurality of limit blocks1523, which can be clamped with the plurality of notched grooves302correspondingly, and the shapes of the plurality of limit blocks1523can be the same or different. In the example inFIG.8, the shapes of the plurality of limit blocks1523include triangular prism, cubic shape and L shape, and the shapes of the limit blocks1523are adapted to the shapes of corresponding notched grooves302. In this example, the front bezel30can be more securely fixed on the backlight module by the second slot301clamping with the second clamping buckle1122and the notched groove302clamping with the limit block1523.

In some exemplary embodiments, as shown inFIGS.3ato3dandFIG.12,FIG.12is a schematic diagram of a top view of a structure of the front bezel inFIG.11according to some exemplary embodiments, wherein a portion of the annular rim32of the front bezel30away from the surface of the display panel20near the circumferential edge of the display panel20and an end face of the annular rim32may be provided with a light-shielding layer to avoid light leakage to affect the picture quality of the display panel20. The light-shielding layer can be a black ink layer formed by spraying. In order to improve the adhesion of the black ink layer, the black ink layer can be set as follows: ink adhesion≥3B, surface hardness>2H, 100% adhesion after 50 times of alcohol resistance test, and no background color after 240 times of friction resistance test. A portion, near the circumferential edge of the display panel20, of the annular rim32of the front bezel30away from the surface of the display panel20may be provided with annular foam61, and the annular foam61may be located above the light-shielding layer. The shape of the annular foam61may be adapted to the shape of the annular rim32and may be both rectangular. The annular foam61can be in an integral molding structure, which can prevent light leakage. The display device may further include a protect film attached to the display surface of the display device, and the protect film can protect the display panel20and can be torn off. As shown inFIGS.13and14,FIG.13is a schematic diagram of a frontal structure of a protect film of a display device according to some exemplary embodiments, andFIG.14is a schematic diagram of a back structure of the protect film inFIG.13according to some exemplary embodiments, the protect film40may include a substrate of a transparent material, and the frontal surface of the protect film40may be provided with an identification area401that may be coated with a color (such as red). The protect film40may also include an annular adhesive tape402disposed on a back of the substrate, and the protect film40may be bonded to the annular foam61of the front bezel30by the annular adhesive tape402.

In some exemplary embodiments, the display panel may include an array substrate that is provided with a binding part bound and connected with an external circuit board, wherein the binding part is disposed near a first side edge of the array substrate, a portion of the array substrate near a second side edge can be provided with a gate on array, the first side edge of the array substrate is adjacent to the second side edge, and the led-bar is disposed near the first side edge of the array substrate.

In an example of this embodiment, as shown inFIGS.3cand9,FIG.9is a schematic diagram of a structure of an display panel of a display device according to some exemplary embodiments, the display panel20may be a liquid crystal display panel, the display panel20may include an array substrate202and a color filter substrate203disposed opposite to each other, a liquid crystal layer disposed between the array substrate202and the color filter substrate203, and a first polarizer disposed on a side of the array substrate202away from the color filter substrate203and a second polarizer disposed on a side of the color filter substrate203away from the array substrate202. The array substrate202may include a binding part2021protruding from one side of the color filter substrate203, and the display panel20may further include a second circuit board201bound and connected with the binding part2021, and the second circuit board201is configured to be connected with an external driving device to drive the display panel20for display. The second circuit board201may be a flexible circuit board and may be bent to a side of the display panel20away from the display side. A driver chip (driver IC) may be bound and connected to the binding unit2021or the second circuit board201. The binding part2021is disposed near a first side edge of the array substrate202, a portion of the array substrate202near a second side edge can be provided with a gate on array (GOA), the first side edge of the array substrate202is adjacent to the second side edge, and the led-bar18is disposed near the first side edge of the array substrate202. The array substrate includes a circuit structure layer (including the GOA) disposed on the substrate, the circuit structure layer includes a plurality of gate lines and a plurality of data lines disposed intersectionally. The GOA may include a plurality of shift registers connected sequentially. Each shift register drives one gate line and provides an opening signal for the next shift register. The GOA can achieve a purpose of conducting the gate lines one by one. In the example inFIG.9, the first side edge of the array substrate202is parallel to a length direction of the array substrate202, and the second side edge of the array substrate202is parallel to a width direction of the array substrate202. The lamp bar18is not disposed near the second side edge of the array substrate202, thereby preventing problems such as abnormal screen display caused by peeling off of the film layer forming the gate on array on the array substrate202due to heat generation of the lamp bar18. A liquid crystal material of the liquid crystal layer can be a wide temperature liquid crystal, which can improve the display quality of the liquid crystal display panel20in a wide temperature range.

In some exemplary embodiments, as shown inFIG.10, which is a schematic diagram of a structure of a second circuit board of the display panel inFIG.9according to some exemplary embodiments, the second circuit board may include a first pin area2011, an electronic component area2012and a second pin area2015, wherein the first pin area2011may be provided with a plurality of first pins that may be bound and connected with a binding part2021of the display panel20, and the second pin region2015may be provided with a plurality of second pins that may be configured to be bound and connected with an external driving device to supply a power signal and a driving signal to the display panel through the second circuit board. The second circuit board can further be provided with a connector2013that can be configured to be electrically connected with the first circuit board of the led-bar and can provide power to the first circuit board. The second circuit board201may further include a reinforcing area2014near the second pin area2015, and a part of the reinforcing area2014may be provided with glue, which is beneficial to insert a second pin of the second pin area2015into a connector of the external driving device and bond the connector with the second circuit board201.

The display device according to the embodiment of the present disclosure can be used in household products such as cooking utensils, laundry equipment, dishwashers, refrigerators, freezers, microwave ovens, coffee machines or ovens. Or, the display device according to the embodiments of the present disclosure may be any product or component with a display function, such as a mobile phone, a tablet, a television, a display, a laptop computer, a digital photo frame, or a navigator.

In the accompanying drawings, the size of a constituent element, and the thickness of a layer or an area are sometimes exaggerated for clarity. Therefore, one implementation of the present disclosure is not necessarily limited to the size, and the shape and size of each component in the drawings do not reflect the actual scale. In addition, the drawings schematically illustrate some examples, and one implementation of the present disclosure is not limited to the shapes or numerical values shown in the drawings.

In the description herein, “parallel” refers to a state in which an angle formed by two straight lines is above −10° and below 10°, and thus also includes a state in which the angle is above −5° and below 5°. In addition, “vertical” refers to a state in which an angle formed by two straight lines is above 80° and below 100°, and thus also includes a state in which the angle is above 85° and below 95°.

In the description herein, orientation or position relationships indicated by the terms such as “upper”, “lower”, “left”, “right”, “top”, “inside”, “outside”, “axial”, “tetragonal” and the like are orientation or position relationships shown in the drawings, and are intended to facilitate description of the embodiments of the present disclosure and simplification of the description, but not to indicate or imply that the mentioned structure has a specific orientation or be constructed and operated in a specific orientation, therefore, they should not be understood as limitations on the present disclosure.

In the description herein, unless otherwise specified and defined explicitly, the terms “connection”, “fixed connection”, “installation” and “assembly” should be understood in a broad sense, and, for example, may be a fixed connection, a detachable connection or an integrated connection; the terms “installation”, “connection” and “fixed connection” may be a direct connection, an indirect connection through intermediate components, or communication inside two components. For those ordinarily skilled in the art, meanings of the above terms in the embodiments of the present disclosure can be understood according to situations.