Backlight module and liquid crystal display device

Abstract

The utility model provides a backlight module and a liquid crystal display device. The backlight module comprises a back plate, a side plate located on one side of the back plate and a light bar fixed to the side plate, and the light bar comprises a connector. An edge folding part is arranged on the edge of the back plate, the edge folding part and the connector are at least partially overlapped in the first direction, and the distance between the edge folding part and the connector in the second direction is within the range of 0-1 mm. The first direction is perpendicular to the plane where the back plate is located and parallel to the direction of the side plate, and the second direction is parallel to the plane where the back plate is located and perpendicular to the direction of the side plate. According to the backlight module, by arranging the edge folding part, the connector can be effectively prevented from generating large displacement when the power line is plugged, the reliability of the backlight module is improved, and the display quality of the display device is ensured.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of display, in particular to a backlight module and a liquid crystal display device. BACKGROUND

[0002] In a liquid crystal display device, a backlight module is an important component for providing a light source required for display. For a side-in backlight module, a lamp strip is usually fixed on a side plate by double-sided adhesive tape, and each lamp strip has at least one power connection head for electrical connection with an external power supply.

[0003] During the development, production and testing of the backlight module, the power connection head of the lamp strip needs to be frequently plugged and unplugged. However, during the plugging and unplugging operation, the power connection head of the lamp strip is easily damaged. Such damage can destroy the preset distance between the lamp strip and the light guide plate of the backlight module, thereby causing display picture defects such as light leakage and lamp shadow, and ultimately reducing the reliability and product quality of the backlight module.

[0004] In addition, since the lamp strip is fixed on the side plate by double-sided adhesive tape, frequent plugging and unplugging operations can also reduce the connection strength between the lamp strip and the side plate, so that the lamp strip is not fixed firmly enough, further affecting the performance and service life of the backlight module.

[0005] Therefore, it is necessary to propose a new technical scheme to solve the above technical problems. CONTENT OF THE UTILITY MODEL

[0006] The purpose of the embodiments of the present application is to provide a backlight module and a liquid crystal display device, which are designed to prevent the connection head of the lamp strip from being displaced too much and to ensure the display quality of the display device.

[0007] The embodiments of the present application provide a backlight module, which comprises a back plate, a side plate located on one side of the back plate, and a lamp strip fixed on the side plate, the lamp strip comprising a connection head; wherein an edge of the back plate is provided with a folded edge portion, the folded edge portion at least partially overlaps the connection head in a first direction, the distance between the folded edge portion and the connection head in a second direction is within a range of 0 millimeters to 1 millimeter, the first direction is perpendicular to the plane in which the back plate is located and parallel to the direction of the side plate, and the second direction is parallel to the plane in which the back plate is located and perpendicular to the direction of the side plate.

[0008] In the above backlight module, a spacer is arranged between the folded edge portion and the connection head in the second direction.

[0009] In the above backlight module, the spacer is fixed on the folded edge portion by adhesive bonding.

[0010] In the backlight module, the thickness of the spacer is in the range of 0.3mm-0.5mm.

[0011] In the backlight module, the distance between the spacer and the connector is in the range of 0mm-0.3mm.

[0012] In the backlight module, the overlapping length of the folded edge and the connector in the first direction is greater than 0mm and less than or equal to the length of the connector in the first direction.

[0013] In the backlight module, the side of the folded edge facing the connector is provided with a recess, and the position of the recess in the first direction corresponds to the position of the connector in the first direction.

[0014] In the backlight module, the area of the opening of the recess is greater than the area of the end of the connector.

[0015] In the backlight module, the deviation value of the position of the center of the recess in the first direction from the position of the vertex of the end of the connector in the first direction is greater than 0mm and less than half of the length of the recess in the first direction.

[0016] Embodiments of the present application also provide a liquid crystal display device, which comprises a liquid crystal display panel and the above backlight module.

[0017] In the backlight module and the liquid crystal display device provided by the present application, by arranging the folded edge at the edge of the back plate and partially overlapping the folded edge and the connector in the first direction (a direction perpendicular to the plane where the back plate is located and parallel to the side plate), the folded edge can be used to limit the connector in the second direction when the power line is plugged in or pulled out, so that the connector is prevented from moving greatly in the second direction, the problem of separation of the light bar and the side plate caused by frequent plugging and unplugging is prevented, the preset distance between the light bar and the light guide plate is effectively maintained, the problems of light leakage, light shadow and other display picture defects are avoided, and the display quality of the display device is ensured. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 is a schematic diagram of a liquid crystal display device provided by embodiments of the present application.

[0019] Figure 2 is a cross-sectional view of a local position of a first embodiment of the liquid crystal display device provided by the present application.

[0020] Figure 3 is a perspective view of a local position of a first embodiment of the liquid crystal display device provided by the present application.

[0021] Figure 4is a partial view of a second embodiment of the liquid crystal display device provided by the present application. DETAILED DESCRIPTION

[0022] The specific embodiments of the present application will be described in detail below with reference to the accompanying drawings.

[0023] The terms "first", "second", and similar terms do not denote any order, quantity, or importance, but are used to distinguish different technical features. The term "multiple" and similar terms mean two or more, unless otherwise explicitly limited.

[0024] Embodiments of the present application can be combined with each other.

[0025] As shown in Figure 1 , Figure 2 , Figure 3 and Figure 4 Embodiments provided by the present application include a liquid crystal display panel 201, a backlight module 202, a timing controller TCON, a source driving circuit DD, and a power management chip (not shown in the figure, the power management chip can be integrated into the same chip as the timing controller TCON). The liquid crystal display panel 201 and the backlight module 202 are combined into one body in a superimposed manner.

[0026] The liquid crystal display panel 201 includes a display area and a non-display area. The display area is provided with m×n pixels P arranged in an array, where m and n are integers greater than 1. The non-display area is located at the periphery of the display area and is used to arrange driving circuits and various signal lines. The liquid crystal display panel 201 further includes a plurality of scan lines (GL1-GLn), a plurality of data lines (DL1-DLm), and a gate driving circuit GOA. The plurality of scan lines (GL1-GLn) extend along a first direction D1 and are arranged along a second direction D2, the plurality of data lines (DL1-DLm) extend along the second direction D2 and are arranged along the first direction D1, and the first direction D1 is perpendicular to the second direction D2. The gate driving circuit GOA is arranged in the non-display area and is electrically connected to the plurality of scan lines (GL1-GLn). The source driving circuit DD is electrically connected to the plurality of data lines (DL1-DLm) through a flexible circuit board. The timing controller TCON is electrically connected to the gate driving circuit GOA and the source driving circuit DD, respectively.

[0027] The liquid crystal display panel 201 includes a thin film transistor array substrate, a counter substrate, and a liquid crystal layer disposed between the two substrates. The thin film transistor array substrate includes a glass substrate, a first metal layer disposed on the glass substrate, a gate insulating layer GI disposed on the first metal layer, a semiconductor layer disposed on the gate insulating layer GI, a second metal layer disposed on the semiconductor layer, a passivation layer disposed on the second metal layer, and a pixel electrode disposed on the passivation layer. The first metal layer includes scan lines (GL1-GLn), gate electrodes, and the like. The second metal layer includes data lines (DL1-DLm), source electrodes, drain electrodes, and the like. The counter substrate includes a glass substrate, a black matrix disposed on the glass substrate, a color filter layer disposed on the black matrix, and a common electrode disposed on the color filter layer.

[0028] Each pixel P includes at least one thin film transistor and a pixel electrode. The gate of the thin film transistor is electrically connected to a corresponding scan line, the source is electrically connected to a corresponding data line, and the drain is electrically connected to a corresponding pixel electrode. When the scan line outputs a high-level scan signal, the thin film transistor is turned on, and the data signal on the data line is transmitted to the pixel electrode through the thin film transistor; when the scan line outputs a low-level scan signal, the thin film transistor is turned off, and the pixel electrode maintains the voltage corresponding to the data signal.

[0029] The gate drive circuit GOA includes n-stage gate drive sub-circuits connected in cascade, and each stage of the gate drive sub-circuit is electrically connected to a scan line. The gate drive sub-circuit sequentially outputs a scan signal under the control of the timing controller TCON to scan each row of pixels P in the display area row by row. The source drive circuit DD generates and outputs a data signal according to image data under the control of the timing controller TCON. The timing controller TCON is used to receive and process externally input image data and timing signals, generate control signals, and transmit image data to the source drive circuit DD. The power management chip is used to provide operating voltages for each part of the liquid crystal display device, including providing a common voltage for the common electrode of the liquid crystal display panel 201, providing a gate drive voltage for the gate drive circuit GOA, providing a gamma voltage for the source drive circuit DD, and the like.

[0030] As Figure 2 , Figure 3 and Figure 4As shown, the backlight module 202 includes a back plate 2011, a side plate 2012 located on one side of the back plate 2011, and a light bar 2013 fixed on the side plate 2012. The light bar 2013 is a side-in light bar. The light bar 2013 includes a connecting head 2015 for electrical connection with an external power supply. The edge of the back plate 2011 is provided with a folded edge portion 20111, and the folded edge portion 20111 at least partially overlaps the connecting head 2015 in a first direction D1, wherein the first direction D1 refers to a direction perpendicular to the plane in which the back plate 2011 lies and parallel to the side plate 2012. The distance between the folded edge portion 20111 and the connecting head 2015 in a second direction D2 is within a range of 0 mm to 1 mm, preferably within a range of 0 mm to 0.3 mm, wherein the second direction D2 refers to a direction parallel to the plane in which the back plate 2011 lies and perpendicular to the side plate 2012.

[0031] During the development, production and testing of the backlight module 202, the power supply line needs to be frequently plugged and unplugged through the through hole of the side plate and the connecting head 2015 of the light bar 2013. In order to avoid damage caused by large displacement of the connecting head 2015 during plugging and unplugging, the present application provides a folded edge portion 20111 on the back plate 2011, specifically, the folded edge portion 20111 at least partially overlaps (partially overlaps or completely overlaps) the connecting head 2015 in the first direction D1, so as to limit the connecting head 2015 of the light bar 2013 by the folded edge portion 20111.

[0032] As shown in FIG. 1, Figure 4 In the second direction D2, a spacer 2016 is provided between the folded edge portion 20111 and the connecting head 2015. The spacer 2016 is fixed on the folded edge portion 20111 by pasting. Specifically, the thickness of the spacer 2016 is within a range of 0.3 mm to 0.5 mm. The distance b between the spacer 2016 and the connecting head 2015 is within a range of 0 mm to 0.3 mm, which can effectively protect the connecting head 2015. The material of the spacer 2016 can be, for example, silicone.

[0033] By providing the spacer 2016 on the folded edge portion 20111, the damage to the connecting head 2015 caused by plugging and unplugging of the power supply line can be further reduced, while preventing the double-sided adhesive from separating from the back plate 2011, ensuring that the preset distance between the lamp beads of the light bar 2013 and the light guide plate 2014 does not change, thereby avoiding display defects such as light leakage and lamp shadow.

[0034] In another specific embodiment of this application, the overlap length 'a' between the folded edge 20111 and the connector 2015 in the first direction D1 is greater than 0 mm and less than or equal to the length 't' of the connector in the first direction; for example, 'a' is in the range of 1 mm to 5 mm. This ensures that the folded edge 20111 provides sufficient restraint and protection for the connector 2015.

[0035] Furthermore, a recessed portion 20112 is provided on the side of the folded edge 20111 facing the connector 2015. The position of the recessed portion 20112 in the first direction D1 corresponds to the position of the connector 2015 in the first direction D1. The area of ​​the opening of the recessed portion 20112 is larger than the area of ​​the end of the connector 2015, thus ensuring that the recessed portion 20112 can cover the end of the connector 2015. Specifically, the deviation between the position of the center of the recessed portion 20112 in the first direction D1 and the position of the apex of the end of the connector 2015 in the first direction D1 is greater than 0 mm and less than half the length of the recessed portion 20112 in the first direction D1.

[0036] The center of the recess 20112 and the vertex of the end of the connector 2015 are located on a plane parallel to the plane where the back plate 2011 is located.

[0037] The backlight module 202 of this application also includes a light guide plate 2014. The light strip 2013 is fixed to the side plate 2012 with double-sided adhesive, the light-emitting surface of the light strip 2013 faces the side of the light guide plate 2014, and there is a preset distance between the light-emitting surface of the light strip 2013 and the side of the light guide plate 2014.

[0038] In practical applications, the folded edge 20111 is formed by bending a portion of the edge of the back plate 2011 to simplify the manufacturing process and reduce production costs.

[0039] In the backlight module 202 and liquid crystal display device provided in this application, by providing a folded edge 20111 at the edge of the back plate 2011 and partially overlapping the folded edge 20111 with the connector 2015 in the first direction D1 (perpendicular to the plane of the back plate 2011 and parallel to the side plate 2012), the folded edge 20111 can limit the connector 2015 in the second direction D2 when the power cord is plugged in or unplugged, preventing the connector 2015 from undergoing large displacement in the second direction D2. This prevents the problem of the lamp strip 2013 separating from the side plate 2012 due to frequent plugging and unplugging, effectively maintaining the preset distance between the lamp strip 2013 and the light guide plate 2014, thereby avoiding problems such as light leakage and lamp shadows that result in poor display images, and ensuring the display quality of the display device.

[0040] In actual application scenarios, the folding edge portion 20111 may be deformed during long-term use, affecting the protection effect of the connector 2015.

[0041] To solve the above technical problems, the improved scheme of the present application is to provide a plurality of reinforcing ribs on the folding edge portion 20111. The reinforcing ribs extend along the length direction of the folding edge portion 20111 and are located on the side of the folding edge portion 20111 away from the connector 2015. Specifically, the spacing between adjacent two reinforcing ribs is 2-5 mm. The cross section of each reinforcing rib is isosceles trapezoidal, in which the bottom width near the folding edge portion 20111 is 0.3-0.8 mm, the top width away from the folding edge portion 20111 is 0.1-0.3 mm, and the height is 0.2-0.5 mm. By providing a plurality of reinforcing ribs on the folding edge portion 20111, the structural strength of the folding edge portion 20111 in the first direction D1 and the second direction D2 can be significantly improved, preventing the folding edge portion 20111 from deforming during long-term use.

[0042] In actual application scenarios, the spacer 2016 may be displaced due to repeated stress.

[0043] To solve the above technical problems, the improved scheme of the present application is to provide a recessed portion 20112 for accommodating the spacer 2016 on the side of the folding edge portion 20111 facing the connector 2015. The shape of the recessed portion 20112 is adapted to the outer contour of the spacer 2016, and its planar size is slightly larger than that of the spacer 2016 by 0.1-0.2 mm. The depth of the recessed portion 20112 is 50-80% of the thickness of the spacer 2016, so that the installed spacer 2016 is partially embedded in the recessed portion 20112 and partially protrudes from the recessed portion 20112. A plurality of micro protrusions are provided on the bottom surface of the recessed portion 20112, which are uniformly distributed in a matrix. Specifically, the cross section of the micro protrusion is circular. When the spacer 2016 is pressed into the recessed portion 20112, the micro protrusions will partially sink into the spacer 2016, thereby increasing the contact area and friction between the spacer 2016 and the recessed portion 20112, preventing the spacer 2016 from being displaced during use. At the same time, since the spacer 2016 is partially embedded in the recessed portion 20112, it can also be laterally limited, improving the fixing stability of the spacer 2016.

[0044] The embodiments of the present application are described in detail above, and the content of the specification should not be understood as limiting the scope of protection of the present application.

Claims

1. A backlight module, characterized in that, The backlight module comprises: a back plate; a side plate located at one side of the back plate; and a light bar fixed on the side plate, the light bar comprising a connecting head; wherein an edge of the back plate is provided with a folded edge portion, the folded edge portion at least partially overlaps the connecting head in a first direction, a distance between the folded edge portion and the connecting head in a second direction is within a range of 0mm to 1mm, the first direction is perpendicular to a plane where the back plate is located and parallel to the side plate, and the second direction is parallel to the plane where the back plate is located and perpendicular to the side plate.

2. The backlight module of claim 1, wherein, A spacer is provided between the folded edge portion and the connecting head in the second direction.

3. The backlight module of claim 2, wherein, The spacer is fixed on the folded edge portion by means of adhesion.

4. The backlight module of claim 2, wherein, A thickness of the spacer is within a range of 0.3mm to 0.5mm.

5. The backlight module of claim 2, wherein, A distance between the spacer and the connecting head is within a range of 0mm to 0.3mm.

6. The backlight module of claim 1, wherein, An overlapping length of the folded edge portion and the connecting head in the first direction is greater than 0mm and less than or equal to a length of the connecting head in the first direction.

7. The backlight module of claim 1, wherein, A side of the folded edge portion facing the connecting head is provided with a recess, a position of the recess in the first direction corresponds to a position of the connecting head in the first direction.

8. The backlight module of claim 7, wherein, An area of an opening of the recess is greater than an area of a terminal end of the connecting head.

9. The backlight module of claim 7, wherein, A deviation value of a position of a center of the recess in the first direction from a position of an apex of the terminal end of the connecting head in the first direction is greater than 0mm and less than half of a length of the recess in the first direction.

10. A liquid crystal display device, characterized by comprising: The liquid crystal display device comprises a liquid crystal display panel and the backlight module as claimed in any one of claims 1 to 9.

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