Display apparatus

1 . A display apparatus, comprising:

a housing;

a first cover plate;

a second cover plate;

a back plate;

a first chamber between the housing and the first cover plate;

a second chamber between the first cover plate and the second cover plate; and

a third chamber between the second cover plate and the back plate;

wherein the first chamber is a waterproof chamber; and

the third chamber is a waterproof chamber;

wherein the display apparatus further comprises:

a second opening extending through the first cover plate; and

a third opening extending through the second cover plate;

wherein the third opening connects the first chamber and the third chamber; and

the third opening is at least partially in the second opening.

2 . The display apparatus of claim 1 , wherein the second cover plate comprises a barrier and a main body, the barrier protruding away from the main body toward the first cover plate; and

the barrier is in direct contact with the first cover plate, enclosing the second chamber.

3 . The display apparatus of claim 2 , further comprising a concave groove extending into the second cover plate;

wherein the barrier spaces apart the second chamber from the concave groove;

a portion of the first cover plate extends into the concave groove, interlocking with the second cover plate; and

the portion of the first cover plate extending into the concave groove is at least partially in contact with a first sealing ring and is at least partially in contact with a second sealing ring.

4 . The display apparatus of claim 1 , wherein the first cover plate comprises a first tubular structure protruding toward the second cover plate, the second opening being an opening of the first tubular structure;

the second cover plate comprises a second tubular structure protruding toward the first cover plate, the third opening being an opening of the second tubular structure; and

the second tubular structure is inserted into the first tubular structure.

5 . The display apparatus of claim 4 , further comprising a first sealing ring and a second sealing ring between an inner wall of the first tubular structure and an outer wall of the second tubular structure, preventing water from passing through between the inner wall of the first tubular structure and the outer wall of the second tubular structure.

6 . The display apparatus of claim 5 , further comprising a water storage space between the first sealing ring and the second sealing ring configured to further prevent water from passing through the second sealing ring.

7 . The display apparatus of claim 1 , further comprising:

a mainboard received in the first chamber;

an adapter board received in the third chamber; and

a transfer flexible printed circuit connected to the mainboard received in the first chamber and connected to the adapter board received in the third chamber;

wherein the transfer flexible printed circuit extends from the first chamber, through the third opening, and into the third chamber.

8 . The display apparatus of claim 1 , further comprising a second bonding structure configured to fixedly attach the first cover plate to the housing, thereby forming the first chamber;

wherein the housing further comprises a fourth groove configured to receive the second bonding structure.

9 . The display apparatus of claim 1 , further comprising a third bonding structure configured to fixedly attach the back plate to the second cover plate, thereby forming the third chamber;

wherein the second cover plate further comprises a fifth groove configured to receive the third bonding structure.

10 . The display apparatus of claim 1 , further comprising:

a flexible display panel configured to transition between a folded state and an unfolded state; and

a push rod;

wherein the push rod and the housing are cooperatively configured to transition the flexible display panel between the folded state and the unfolded state; and

the second chamber is configured to receive a portion of the flexible display panel.

11 . The display apparatus of claim 10 , wherein the flexible display panel bends about a support portion of the push rod;

the push rod is slidably attached to the housing;

the push rod is slidably movable relative to the housing; and

the flexible display panel is configured to transition between the folded state and the unfolded state as the push rod slidably moves relative to the housing.

12 . The display apparatus of claim 10 , wherein the push rod is a push rod having a comb shape comprising multiple teeth;

the housing comprises multiple slots configured to receive the multiple teeth of the push rod; and

at least one of the multiple teeth of the push rod comprises a start-stop limit structure configured to define the limits of the slidable movement of the push rod relative to the housing.

13 . The display apparatus of claim 1 , further comprising a first bonding structure configured to attach the flexible display panel to the housing; and

the first bonding structure is configured to form a sealed chamber between the flexible display panel and the housing.

14 . The display apparatus of claim 13 , wherein the flexible display panel comprises a pad bending area; and

the first bonding structure is configured to fixedly attach the pad bending area of the flexible display panel to a frame portion of the housing.

15 . The display apparatus of claim 13 , wherein the housing further comprises a second groove configured to at least partially receive the first bonding structure; and

the first bonding structure at least partially extends into, and attaches to, the second groove of the housing.

16 . The display apparatus of claim 1 , further comprising:

a push rod; and

an outer casing attached to the housing and attached to the push rod;

wherein the display apparatus has a first display area and a second display area; and

the first display area is capable of sliding open to increase a total display area of the display apparatus, or retracting to decrease the total display area of the display apparatus;

wherein the outer casing wraps around a portion of the flexible display panel that bends about the support portion of the push rod;

the outer casing further wraps around at least a portion of the first display area when the portion of the first display area is retracted; and

the outer casing further wraps around side edges of the flexible display panel.

17 . The display apparatus of claim 16 , wherein the outer casing comprises a first protrusion;

the housing comprises a first groove;

the first protrusion and the first groove are configured to interlock with each other, thereby attaching the outer casing to the housing; and

the first groove is a blind groove.

18 . The display apparatus of claim 1 , further comprising:

a coil spring; and

a pin shaft;

wherein the pin shaft is configured to attach the coil spring to the housing;

the pin shaft is movably attached to the housing;

a first portion of the coil spring is attached to the pin shaft, a second portion of the coil spring is attached to the flexible display panel, providing a tensioning mechanism for the flexible display panel; and

the coil spring and the pin shaft are received in the second chamber.

19 . The display apparatus of claim 18 , wherein the second cover plate comprises a second protrusion;

the housing comprises a third groove;

the second protrusion and the third groove are configured to interlock with each other, securing the pin shaft; and

the pin shaft passes through the coil spring, achieving fixation of the coil spring.

20 . The display apparatus of claim 1 , further comprising:

a mainboard received in the first chamber;

a first opening extending through a side of the housing; and

a flexible printed circuit connected to the flexible display panel, and connected to the mainboard;

wherein the flexible printed circuit extends through the first opening into the first chamber to connect to the mainboard.