Liquid crystal display panel

The present application provides a liquid crystal display comprising a display panel, a backlight module, and a plurality of connecting screws. Wherein, the display panel and the backlight module have a plurality of correspondingly arranged threaded holes, and the plurality of connecting screws cooperate with the plurality of threaded holes to fix the display panel and the backlight module together.

CROSS REFERENCE TO RELATED APPLICATION

This application claims the priority of International Application No. PCT/CN2019/117994, filed on Nov. 13, 2019, which claims priority to Chinese Application No. 201910753107.6, filed on Aug. 15, 2019. The entire disclosures of each of the above applications are incorporated herein by reference.

BACKGROUND OF INVENTION

Field of Invention

The present invention relates to the field of electronic display, and in particular, to a liquid crystal display (LCD) panel.

Description of Prior Art

In liquid crystal displays (LCDs), a backlight module of a display is usually bonded to a display panel with a light-shielding tape. The light-shielding tape includes a substrate and a binder, and the commonly used substrate includes a polyethylene terephthalate (PET), and the binder includes an acrylic binder.

Technical Problems

Referring toFIG. 1andFIG. 2, when a display panel and a backlight module are bonded by a light-shielding tape, in order to ensure reliability of the bonding, the light-shielding tape needs to cover all frames of the display panel, and the cost is relatively high. Further, with a number of usages increasing and temperatures rising, a viscosity of acrylic adhesive decreases, resulting in a decrease in adhesive ability of the light-shielding tape, which pose a risk of the display panel and the backlight module separating.

Therefore, there is a need to improve the backlight module of the existing display panel and the fixing method of the display panel.

SUMMARY OF INVENTION

The present application provides a liquid crystal display to optimize the backlight module of the display screen and a fixing method of the display panel.

The application provides a liquid crystal display comprising a display panel, a backlight module and a plurality of connecting screws;

wherein the display panel and the backlight module have a plurality of correspondingly arranged threaded holes, and the plurality of connecting screws cooperate with the plurality of threaded holes to fix the display panel and the backlight module together.

According to one aspect of the application, wherein each of the threaded holes comprises:

a first threaded hole disposed on the display panel;

a second threaded hole disposed on the backlight structure;

wherein the first threaded hole and the second threaded hole overlap when the display panel and the backlight module are combined.

According to one aspect of the application, wherein the liquid crystal display further comprises a cushioning pad located between the liquid crystal panel and the backlight module;

wherein each threaded hole further comprises a third threaded hole disposed on the cushioning pad;

wherein the first threaded hole, the second threaded hole, and the third threaded hole overlap when the display panel and the backlight module are combined.

According to one aspect of the application, wherein a material forming the cushioning pad is a flexible material.

According to one aspect of the application, wherein the liquid crystal panel comprises a display area and a non-display area, the non-display area is disposed on a circumference side of the display area, and the plurality of first threaded holes are disposed in the non-display area.

According to one aspect of the application, wherein the backlight module comprises a light emitting unit and a supporting unit, the supporting unit is fixed on a circumference side of the light emitting unit, and the plurality of second threaded holes are disposed in the supporting unit.

According to one aspect of the application, wherein the liquid crystal display further comprises a plurality of detecting devices disposed corresponding to the plurality of threaded holes, when the connecting screws are fixedly coupled with the plurality of threaded holes, a detecting circuit of each detecting device is located between the connecting screw and the threaded hole corresponding to the detecting device.

According to one aspect of the application, wherein the plurality of detecting devices comprise a detecting circuit, a signal collecting unit, and a determining circuit, wherein the detecting circuit comprises a Wheatstone bridge, and resistances constituting the Wheatstone bridge are varistors.

According to one aspect of the application, wherein the signal collecting unit comprises:

a current detecting module configured to collect a current output by the Wheatstone bridge;

a voltage detecting module configured to collect a voltage output by the Wheatstone bridge.

According to one aspect of the application, wherein the determining circuit determines a fixed state of the liquid crystal display according to an electric signal collected by the signal collecting unit;

when a current signal collected by the current detecting module is equal to a threshold current signal and a voltage signal collected by the voltage detecting module is 0, the determining circuit determines that the display panel and the backlight module of the liquid crystal display are fixed;

wherein the threshold current signal is the current output by the Wheatstone bridge when the display panel of the liquid crystal display and the backlight module are fixed.

Beneficial Effects

The present application adopts a screw structure as a fixing member between a display panel and a backlight module of a liquid crystal display, instead of the light-shielding tape in the prior art. On one hand, the present application prevents a risk of the display panel and the backlight module from falling off due to the decline in bonding ability with the increase of usage time, and improves the reliability of the liquid crystal display. On the other hand, because an area of the screw structure is significantly less than an area of the adhesive tape, the technical solution of the present application can significantly reduce the fixing cost between the display panel and the backlight module.

DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS

Description of following embodiment, with reference to accompanying drawings, is used to exemplify specific embodiments which may be carried out in the present disclosure. Directional terms mentioned in the present disclosure, such as “top”, “bottom”, “front”, “back”, “left”, “right”, “inside”, “outside”, “side”, etc., are only used with reference to orientation of the accompanying drawings. Therefore, the directional terms are intended to illustrate, but not to limit, the present disclosure. In the drawings, components having similar structures are denoted by same numerals.

First, the prior art will be briefly described. Referring toFIG. 1andFIG. 2,FIG. 1is a plan view of a display panel in a liquid crystal display panel of the prior art, andFIG. 2is a cross-sectional view of the liquid crystal display panel ofFIG. 1taken along a AA′ direction. In the prior art, a display panel01is fixed to a backlight module03by an adhesive tape02. Referring toFIG. 2, the display panel includes a control circuit011, a light emitting structure012, and a protective film013. The backlight module03includes a light emitting unit031and a supporting unit032. The support unit032is fixed to a peripheral side of the light emitting unit031. The support unit032has a groove on a surface on which the display panel01is attached, and the adhesive tape02is disposed in the groove.

Referring toFIG. 1andFIG. 2, in the prior art, the light shielding tape needs to cover all frames of the display panel, and the cost is relatively high. In addition, with a number of usages increasing and temperatures rising, a viscosity of acrylic adhesive decreases, resulting in a decrease in the adhesive ability of the light-shielding tape, which pose a risk of the display panel and the backlight module separating.

Therefore, the present application provides a liquid crystal display to optimize the backlight module of the display screen and the fixing method of the display panel.

Referring toFIG. 4toFIG. 8, the present application provides a liquid crystal display including a display panel10, a backlight module30, a plurality of connection screws42, a flexible circuit board50, and a control chip60.

Referring toFIG. 3andFIG. 4,FIG. 3is a structural diagram of a liquid crystal display panel according to an embodiment of the present application, andFIG. 4is a cross-sectional view of the liquid crystal display panel ofFIG. 3taken along a BB′ direction. The display panel10includes a display area and a non-display area10bsurrounding the display area. The display panel10and the backlight module30have a plurality of correspondingly disposed threaded holes41, the plurality of connecting screws42cooperate with the plurality of threaded holes41to fix the display panel10and the backlight module30together.

In the present application, the liquid crystal display further includes a buffer pad20between the liquid crystal panel and the backlight module30. Specifically, the surface of the backlight module30that is in contact with the display panel10has a groove, and the buffer pad20is disposed in the groove. In the present embodiment, the buffer pad20is made of a flexible material in order to prevent cracking of the panel caused by an excessive pressure applied to the display panel when the screws42are mounted. A thickness of the buffer pad20is slightly greater than a thickness of the groove, for example, the thickness of the buffer pad20is 1.5 to 2 times the thickness of the groove.

In the present application, each threaded hole41includes a first threaded hole41a, a second threaded hole41b, and a third threaded hole41c. The first threaded hole41ais disposed on the display panel10, specifically, on the non-display area10bof the display panel10. The second threaded hole41bis disposed on the backlight structure. The third threaded hole41cis provided on the buffer pad20. When the display panel10and the backlight module30are combined, the first threaded hole41a, the second threaded hole41b, and the third threaded hole41coverlap.

Referring toFIG. 4, the display panel10includes a control circuit11, a light emitting structure12, and a protective film13, which are stacked. The backlight module30includes a light emitting unit31and a supporting unit32. The supporting unit32is fixed to a circumferential side of the light emitting unit31, and the plurality of second threaded holes41bare disposed on the supporting unit32.

Referring toFIGS. 5 and 6, the display panel10and the backlight module30are fixed together by threaded holes41and screws42. The thread structure is not easily affected by external environment due to its strong fixing ability, so its stability is good. Moreover, a fixing area occupied by the thread structure is also small, so the present invention significantly optimizes the fixing method of the display panel10and the backlight module30.

In the present application, in order to prevent the display panel from cracking due to excessive pressure applied to the display panel when the screws42are mounted, as well as prevent the screw42from being skewed or offset in the installation process, at least one detecting device is required for real time monitoring of the pressure around the first threaded hole41aduring the installation of the screw42. The plurality of detecting devices are disposed corresponding to the plurality of threaded holes41. When the connecting screws42are fixedly coupled to the plurality of threaded holes41, a detecting circuit of each of the detecting devices is located between the connecting screws42and the threaded holes41corresponding to the detecting devices.

Referring toFIG. 5,FIG. 7, andFIG. 8, the detecting devices include the detecting circuit, a signal collecting unit, and a determining circuit. In this embodiment, the detecting circuit includes a Wheatstone bridge, and a resistance forming the Wheatstone bridge is a varistor. The Wheatstone bridge consisting of the varistor can accurately detect pressure between the connecting screws42and the threaded holes41, and convert the pressure into a different electrical signal according to a magnitude of the pressure.

Referring toFIG. 7, in this embodiment, the detecting circuit includes a first varistor R1, a second varistor R2, a third varistor R3, and a fourth varistor R4. The first varistor R1, the second varistor R2, the third varistor R3, and the fourth varistor R4are connected in series to form the Wheatstone bridge. Four nodes of the Wheatstone circuit are first node A, second node B, third node C, and fourth node D, respectively. A first resistor Rp1is disposed between the first node A and the Wheatstone bridge. Another first resistor Rp1is disposed between the second node B and the Wheatstone bridge. A second resistor Rp2is disposed between the third node C and the Wheatstone bridge. Another second resistor Rp2is disposed between the fourth node D and the Wheatstone bridge.

The signal collection unit includes a current detecting module and a voltage detecting module. The current detecting module is configured to collect a current output by the Wheatstone bridge. The voltage detecting module is configured to collect a voltage output by the Wheatstone bridge.

The determining circuit determines a fixed state of the liquid crystal display according to an electric signal collected by the signal collecting unit. When a current signal collected by the current detecting module is equal to a threshold current signal and a voltage signal collected by the voltage detecting module is 0, the determining circuit determines that the display panel10and the backlight module30of the liquid crystal display are fixed. The threshold current signal is the current output by the Wheatstone bridge when the display panel of the liquid crystal display10and the backlight module30are fixed.

For example, in this embodiment, referring toFIG. 7, when a power V is applied across the third node C and the fourth node D, the voltage detecting module detects that a voltage difference between the first node A and the second node B is zero; and when the power V is applied across the first node A and the second node B, the voltage detecting module detects that a voltage difference between the third node C and the fourth node D is zero. It is indicated that the varistors around the threaded holes41are balanced by force, and the screws42are aligned accurately. At this time, the circuit outputs a command to tighten the screws42continuously.

Meanwhile, when the power V is applied across the third node C and the fourth node D, the current detecting module detects the current passing through the second resistor Rp2. If the detected current is equal to the threshold current set by the system, the screw42are fully tightened. At this point, the circuit outputs a command to stop tightening the screws.

Likewise, when the power V is applied across the third node C and the fourth node D, the voltage detecting module detects that a voltage difference between the first node A and the second node B is not zero, and when the power V is applied across the first node A and the second node B, the voltage detecting module detects that a voltage difference between the third node C and the fourth node D is not zero. It is indicated that the varistors around the threaded holes41are not balanced by force, and the screws42are not aligned accurately. At this time, the circuit outputs a command to loosen the screws until the screws are aligned.

Meanwhile, when the power V is applied across the third node C and the fourth node D, the current detecting module detects the current passing through the second resistor Rp2. If the detected current is greater than the threshold current set by the system, the screw42are not fully tightened. At this point, the circuit outputs a command to tighten the screws. If the detected current is less than the threshold current set by the system, the screw42are too tight. At this point, the circuit outputs a command to quickly loosen the screws to prevent excessive pressure at the threaded holes from crushing the display panel.

The present application adopts a screw structure as a fixing member between a display panel and a backlight module of a liquid crystal display, instead of the light-shielding tape in the prior art. On one hand, the present application prevents a risk of the display panel and the backlight module from falling off due to the decline in bonding ability with the increase of usage time, and improves the reliability of the liquid crystal display. On the other hand, because an area of the screw structure is significantly less than an area of the adhesive tape, the technical solution of the present application can significantly reduce the fixing cost between the display panel and the backlight module.

As is understood by persons skilled in the art, the foregoing preferred embodiments of the present disclosure are illustrative rather than limiting of the present disclosure. It is intended that they cover various modifications and that similar arrangements be included in the spirit and scope of the present disclosure, the scope of which should be accorded the broadest interpretation so as to encompass all such modifications and similar structures.