TWI485470B - Display module - Google Patents

Description

Display module

The invention relates to a display module.

With the continuous innovation of the information and communication industry, the market for liquid crystal display (LCD) has been booming. LCD monitors are widely used in personal digital assistants (PDAs), mobile phones, video recorders, and notebooks because of their high image quality, small size, light weight, low driving voltage, and low power consumption. Consumer communications or electronic products such as computers, desktop displays, automotive displays, and projection televisions.

The conventional liquid crystal display module (LCM) includes a liquid crystal panel of the front half and a backlight module of the second half, and the assembled liquid crystal display module is assembled with the housing of the electronic product. The light source circuit board in the backlight module needs to be electrically connected to the control circuit board. Generally, the light source circuit board and the control circuit board are connected by way of soldering or the like. However, as shown in FIG. 1 , in the conventional display module, sometimes the control circuit board 10 and the light source circuit board 20 need to be folded back to the rear of the bracket 30 of the backlight module. At this time, since there is a stroke difference between the control circuit board 10 and the light source circuit board 20, the light source circuit board 20 is floated outward, which not only affects the appearance but also affects the assembly of the liquid crystal display module. In addition to this, the floating light source circuit board 20 is easily pulled, resulting in abnormal signal conduction.

Therefore, the object of the present invention is to provide a display module for solving various problems caused by the floating circuit board and the floating of the light source circuit board.

According to an embodiment of the invention, a display module includes a backlight module, a display panel, a flexible circuit board, and a conductive adhesive. The backlight module comprises a bracket, a light guide plate and a light emitting unit. The bracket has a bottom plate and a frame standing upright on the bottom plate, wherein the frame includes a hole. The light guide plate is disposed in the bracket. The light emitting unit is disposed between the light guide plate and the frame, the light emitting unit has a contact terminal, and the contact terminal is exposed to the broken hole. The display panel is disposed on the backlight module. The display panel includes a lower substrate. The lower substrate includes a plurality of first signal connection terminals and second signal connection terminals, wherein the second signal connection terminals are adjacent to the holes. The flexible circuit board has a front side and a back side, and the flexible circuit board comprises a plurality of first pads disposed on the front side and a second pad disposed on the back side, wherein the first pads are respectively connected to the first signal connection terminals, and the second pads are respectively connected Adjacent holes. The conductive glue connects the contact terminal, the second signal connection terminal, and the second pad.

In one or more embodiments of the invention, portions of the second signal connection terminals are not covered by the flexible circuit board.

In one or more embodiments of the present invention, the size of the second signal connection terminal is larger than the size of the first signal connection terminal.

In one or more embodiments of the invention, the contact terminal, the second signal connection terminal and the second pad have the same potential.

In one or more embodiments of the invention, the conductive paste comprises a silver paste.

In one or more embodiments of the invention, a portion of the conductive paste is filled into the breach.

The signal of the contact terminal of the light emitting unit may be from the first substrate The second signal connection terminal and/or the second soldering pad on the flexible circuit board ensure the smooth entry of the signal into the contact terminal by the contact terminal and the second signal connection terminal and the double channel between the contact terminal and the second pad, thereby effectively avoiding The signal is abnormal. In addition, the circuit board of the light-emitting unit is embedded in the bracket, and does not need to be folded back to the back of the bracket, thereby avoiding various problems caused by the floating of the light source circuit board when the conventional reverse-refractive light source circuit board is used.

The spirit and scope of the present invention will be apparent from the following description of the preferred embodiments of the invention. The spirit and scope of the invention are not departed.

Referring to Figure 2, there is shown a cross-sectional view of an embodiment of a display module of the present invention. The display module 100 includes a backlight module 110, a display panel 130, and a flexible circuit board 140. The backlight module 110 includes a bracket 112 , a light guide plate 120 , and a light emitting unit 122 . The bracket 112 includes a bottom plate 114 and a frame 116 standing upright on the outer edge of the bottom plate 114. The light guide plate 120 is placed on the bottom plate 114, and the light emitting unit 122 is located between the light guide plate 120 and the frame 116. The frame 116 can be bent to define a accommodating space between the light guide plate 120 and the frame 116, and the light-emitting unit 122 is located in the accommodating space. The light emitting unit 122 includes a circuit substrate 124 and a light emitting element 126. The circuit substrate 124 and the light emitting element 126 are both located within the frame 116.

The display panel 130 is disposed on the backlight module 110. Specifically, the display panel 130 is located on the light guide plate 120 and located inside the frame 116. The flexible circuit board 140 is a control circuit board, and after being connected to the display panel 130, The flexible circuit board 140 is then folded back to the back of the bracket 112. The display module 100 proposes a connection structure such that the light-emitting unit 122 does not need to be connected to the flexible circuit board 140 through a circuit board extending outside the bracket 112. The assembly steps of the display module 100 will be specifically described below.

Referring to FIG. 3, a top view of an embodiment of the backlight module 110 in FIG. 2 is illustrated. The backlight module 110 includes a bracket 112 , a light guide plate 120 , and a light emitting unit 122 . The light guide plate 120 is placed in the bracket 112, the light emitting unit 122 is located inside the bracket 112, and the light emitting unit 122 is located between the light guide plate 120 and the frame 116. The light emitting unit 122 includes a circuit substrate 124 and a light emitting element 126 located on the circuit substrate 124. The light emitting unit 122 further includes at least one contact terminal 128 on the circuit substrate 124. The frame 116 has at least one hole 118 at a position corresponding to the position of the contact terminal 128 such that the contact terminal 128 is exposed to the hole 118. In this embodiment, the number of the contact terminals 128 and the holes 118 is two.

4 and FIG. 5, FIG. 4 is a top view of an embodiment of the display panel 130 of FIG. 1, and FIG. 5 is a top view of an embodiment of the flexible circuit board 140 of FIG. .

The display panel 130 can be a liquid crystal display panel. The display panel 130 includes a lower substrate 132. The lower substrate 132 can be a glass substrate. The lower substrate 132 is provided with at least one driving wafer 134 for driving pixels in the display panel 130. The lower substrate 132 needs to be connected to the flexible circuit board 140 so that the signal provided by the flexible circuit board 140 can enter the lower substrate 132, so that the driving chip 134 drives the corresponding pixel according to the received signal to display the desired image.

The lower substrate 132 includes a plurality of first signal connection terminals 136 and at least one second signal connection terminal 138. The first signal connection terminal 136 and the second signal connection terminal 138 of the lower substrate 132 are located on the same surface of the lower substrate 132, wherein the second signal connection terminal 138 is located outside the first signal connection terminal 136. For example, in the embodiment, two second signal connection terminals 138 are disposed on the lower substrate 132, and the second signal connection terminals 138 are located on opposite outer sides of the first signal connection terminal 136. And the size of the second signal connection terminal 138 is larger than the size of the first signal connection terminal 136. The second signal connection terminal 138 is a through hole 118 provided in the adjacent second figure.

The flexible circuit board 140 also includes a plurality of first pads 142 corresponding to the first signal connection terminals 136 and at least one second pad 144 corresponding to the second signal connection terminals 138. The flexible circuit board 140 includes a front surface facing the display panel 130 and a back surface opposite to the front surface (the surface seen in the drawing is a back surface). The first solder pad 142 is disposed on the front surface of the flexible circuit board 140, and the first solder pad 142 is disposed on the front surface of the flexible circuit board 140. It is connected to the first signal connection terminal 136 one-to-one. The second pad 144 is located on the back side of the flexible circuit board 140. In this embodiment, the number of the second pads 144 is two, and the second pads 144 are respectively adjacent to opposite sides of the flexible circuit board 140.

Next, referring to FIG. 6, a top view of the display panel 130 of FIG. 4 connected to the flexible circuit board 140 of FIG. 5 is shown. The display panel 130 and the flexible circuit board 140 can be connected through an anisotropic conductive film (ACF) or the like, so that the first signal connection terminal 136 on the display panel 130 and the first soldering on the flexible circuit board 140 are respectively soldered. The pads 142 are connected to transmit signals from the control elements on the flexible circuit board 140 to the drive wafers 134 on the display panel 130. After the flexible circuit board 140 is connected to the display panel 130, a portion of the second signal connection terminal 138 is exposed to the flexible circuit board 140, that is, a portion of the second signal connection terminal 138 is not covered by the flexible circuit board 140.

Next, referring to FIG. 7 , a top view of the display panel 130 and the flexible circuit board 140 in FIG. 6 after being placed on the backlight module 110 of FIG. 3 is illustrated. After the display panel 130 and the flexible circuit board 140 are assembled, the display panel 130 and the flexible circuit board 140 are placed on the backlight module 110. At this time, the contact terminal 128 of the light-emitting unit 122 (see FIG. 2) located in the bracket 112 is exposed to the hole 118 of the bracket 112, and the display panel 130 abuts the frame 116 of the bracket 112, and the lower substrate 132 The two signal connection terminals 138 are adjacent to the holes 118, and the second pads 144 of the flexible circuit board 140 are also adjacent to the holes 118. In other words, the contact terminals 128 exposed to the holes 118, the second signal connection terminals 138 of the display panel 130, and the second pads 144 of the flexible circuit board 140 are adjacent to each other. The flexible circuit board 140 is folded back to the back of the bracket 112.

Finally, referring to FIG. 8, a top view of an embodiment of the display module of the present invention is completed. The display module 100 further includes a conductive adhesive 150. The conductive adhesive 150 is filled in the hole 118 in FIG. 7 and its surroundings to connect the contact terminal 128, the second signal connection terminal 138 and the second bonding pad 144. The contact terminal 128, the second signal connection terminal 138, and the second pad 144 are electrically connected to each other to have the same potential.

As such, the voltage source of the contact terminal 128 may be from the second signal connection terminal 138 on the lower substrate 132 and/or the second pad 144 on the flexible circuit board 140, through the contact terminal 128 and the second signal connection terminal. 138 and the double channel between the contact terminal 128 and the second pad 144 ensure electric The voltage smoothly enters the contact terminal 128 and is supplied to the light-emitting unit 122 (see FIG. 2), thereby effectively preventing the signal from being abnormal.

In addition, compared with the embodiment disclosed in FIG. 1 , the display module 100 of the present invention only has the flexible circuit board 140 as a control circuit board folded back to the back of the bracket 112 , and the light emitting unit 122 (see FIG. 2 ). The circuit board 124 (see FIG. 2) is built in the bracket 112, and does not need to be folded back to the back of the bracket 112, which solves the problem that the light source circuit board floats due to the simultaneous reflex control circuit board and the light source circuit board. All kinds of problems.

Referring to Fig. 9, a cross-sectional view taken along line 9-9 of Fig. 8 is shown. The second signal connection terminal 138 on the lower substrate 132 has a larger size such that a portion of the second signal connection terminal 138 is exposed to the flexible circuit board 140. The first pad 142 on the front side of the flexible circuit board 140 is further connected to the second signal connection terminal 138, so that a signal (such as a voltage source) of the flexible circuit board 140 can enter the second signal connection terminal 138 via the first pad 142. The flexible circuit board 140 and the lower substrate 132 can be connected by an anisotropic conductive paste.

Referring to Fig. 10, a cross-sectional view taken along line 10-10 of Fig. 8 is illustrated. The display panel 130 is placed on the light guide plate 120. The flexible circuit board 140 is placed on the bracket 112 and protrudes from the bezel 116. The contact terminal 128 on the circuit substrate 124 of the light emitting unit is exposed to the through hole 118 of the bezel 116. The contact terminal 128, the second signal connection terminal 138 and the second pad 144 are not located at the same horizontal plane, the second signal connection terminal 138 and the second pad 144 are substantially at the same height, and the contact terminal 128 located in the hole 118 It is lower than the two. The conductive adhesive 150 is connected to the contact terminal 128, the second signal connection terminal 138 and the second bonding pad 144, and a part of the conductive adhesive 150 is Fill in the hole 118. The conductive paste 150 may be an adhesive doped with conductive particles, such as silver paste or the like.

It will be apparent from the above-described preferred embodiments of the present invention that the application of the present invention has the following advantages. The signal of the contact terminal of the light emitting unit may be from a second signal connection terminal on the lower substrate and/or a second pad on the flexible circuit board, through the contact terminal and the second signal connection terminal, and the contact terminal and the second pad The dual channel between the two ensures that the signal enters the contact terminal smoothly, effectively avoiding the abnormality of the signal conduction. In addition, the circuit board of the light-emitting unit is embedded in the bracket, and does not need to be folded back to the back of the bracket, thereby avoiding various problems caused by the floating of the light source circuit board when the conventional reverse-refractive light source circuit board is used.

Although the present invention has been described above in terms of a preferred embodiment, it is not intended to limit the invention, and it is obvious to those skilled in the art that various changes and modifications can be made without departing from the spirit and scope of the invention. The scope of the invention is defined by the scope of the appended claims.

10‧‧‧Control circuit board

20‧‧‧Light source circuit board

30‧‧‧ bracket

100‧‧‧ display module

110‧‧‧Backlight module

112‧‧‧ bracket

114‧‧‧floor

116‧‧‧Border

118‧‧‧ hole

120‧‧‧Light guide

122‧‧‧Lighting unit

124‧‧‧ circuit board

126‧‧‧Lighting elements

128‧‧‧Contact terminals

130‧‧‧ display panel

132‧‧‧lower substrate

134‧‧‧Drive chip

136‧‧‧First signal connection terminal

138‧‧‧Second signal connection terminal

140‧‧‧Soft circuit board

142‧‧‧First pad

144‧‧‧Second pad

150‧‧‧ conductive adhesive

9-9, 10-10‧‧‧ segments

The above and other objects, features, advantages and embodiments of the present invention will become more <RTIgt;

2 is a cross-sectional view showing an embodiment of a display module of the present invention.

FIG. 3 is a top view of an embodiment of the backlight module in FIG. 2.

4 is a top view of an embodiment of the display panel in FIG. 1.

Fig. 5 is a top view showing an embodiment of the flexible circuit board in Fig. 1.

Figure 6 shows the display panel in Figure 4 and the soft electricity in Figure 5. The top view after the board is connected.

FIG. 7 is a top view of the display panel and the flexible circuit board in FIG. 6 after being placed on the backlight module of FIG. 3.

FIG. 8 is a top view of an embodiment of the display module of the present invention after assembly.

Figure 9 is a cross-sectional view along line 9-9 of Figure 8.

Figure 10 is a cross-sectional view taken along line 10-10 of Figure 8.

100‧‧‧ display module

110‧‧‧Backlight module

112‧‧‧ bracket

118‧‧‧ hole

128‧‧‧Contact terminals

130‧‧‧ display panel

132‧‧‧lower substrate

138‧‧‧Second signal connection terminal

140‧‧‧Soft circuit board

144‧‧‧Second pad

150‧‧‧ conductive adhesive

9-9, 10-10‧‧‧ segments

Claims (6)

A display module comprising: a backlight module, comprising: a bracket having a bottom plate and a frame standing upright on the bottom plate, wherein the frame comprises a broken hole; a light guide plate disposed in the bracket; and a light emitting The unit is disposed between the light guide plate and the frame, the light emitting unit has a contact terminal, the contact terminal is exposed to the hole; a display panel is disposed on the backlight module, the display panel includes a lower substrate, the display panel The lower substrate includes a plurality of first signal connection terminals and a second signal connection terminal, wherein the second signal connection terminal is adjacent to the hole; a flexible circuit board having a front surface and a back surface, the flexible circuit board comprising a plurality of first pads on the front surface, and a second solder pad disposed on the back surface, wherein the first pads are respectively connected to the first signal connection terminals, and the second pads are adjacent to the holes; And a conductive adhesive connecting the contact terminal, the second signal connection terminal and the second bonding pad. The display module of claim 1, wherein a portion of the second signal connection terminal is not covered by the flexible circuit board. The display module of claim 1, wherein the size of the second signal connection terminal is larger than the size of the first signal connection terminals. The display module of claim 1, wherein the contact terminal and the second signal connection terminal have the same potential as the second pad. The display module of claim 1, wherein the conductive paste comprises silver paste. The display module of claim 1, wherein a part of the conductive paste is filled in the hole.