KR102448677B1 - Connector unit and display device including the same - Google Patents

Abstract

Embodiments of the present invention are disposed on a printed circuit board and disposed between a housing having a window of a predetermined size through which the inserted cable is exposed, a flip in which one side is hinged with the housing, and the housing and the flip, It is possible to provide a connector unit including a pressing part for pressing a cable exposed to a window by flipping, and a display device including the same.

Description

A connector unit and a display device including the same

Embodiments of the present invention relate to a connector unit and a display device including the same.

As the information society develops, the demand for display devices for displaying images is increasing in various forms, and liquid crystal display devices (LCDs), plasma display devices, organic light emitting display devices ( Various types of flat panel display devices such as OLED: Organic Light Emitting Display Device) have appeared.

Such a display device includes several components internally, and these components may be electrically connected by cables. A flexible flat cable (FFC) is mainly used as a cable for connecting components. For example, printed circuit boards included in the display device may transmit and receive voltages and signals through flexible flat cables. In addition, as the functions of the display device are advanced, the types of signals transmitted and received between the constituent devices are increasing, and the transmission speed thereof is also increasing.

The flexible flat cable may be electrically connected to a pattern formed in the printed circuit board through a connector fixed to the printed circuit board. In general, a connector can consist of a connector terminal, a housing and a cover, and the connector terminal connected to the pattern of the printed circuit board is in contact with the pad of the flexible flat cable, and through this contact, the flexible flat cable is indirectly connected to the pattern of the printed circuit board. can be connected to

However, since the flexible circuit board and the flexible flat cable are connected through the connector terminal, the flexible circuit board and the flexible flat cable are not directly connected. When voltage and signal are transmitted through the connector terminal, contact resistance, etc. may occur. As a result, the transmitted signal may be distorted. Also, even when the connection of the connector is weakened, the transmitted signal may be distorted. Therefore, a method to minimize signal distortion is required, and it is important not to weaken the connection of the connector.

In addition, the thickness of the flat panel display device is getting thinner. If there is a connector terminal, the thickness of the contactor is thicker than when the pattern of the printed circuit board and the flexible flat cable are in direct contact, which makes the thickness of the flat panel display device thinner. There are limits.
The technology that is the background of the present invention is disclosed in Korean Patent Application Laid-Open No. 10-2017-0099036 (2017.08.31.).

SUMMARY OF THE INVENTION It is an object of embodiments of the present invention to provide a connector unit that minimizes contact resistance and a display device using the same.

Another object of the embodiments of the present invention is to provide a connector unit and a display device using the same, which reduce the thickness of the connector so that the thickness of the display device can be reduced and the coupling force of the connector is not reduced.

In one aspect, embodiments of the present invention provide a housing disposed on a printed circuit board and having a window of a predetermined size through which an inserted cable is exposed, a flip in which one side is hinged with the housing, and between the housing and the flip. It is arranged and it is possible to provide a connector unit including a pressing part for pressing the cable exposed to the window by flipping.

In another aspect, embodiments of the present invention provide a housing fixed on a printed circuit board, into which a cable is inserted so that a portion of the cable is disposed on the printed circuit board, on a cable disposed on the printed circuit board. It is possible to provide a printed circuit board including a pressing unit disposed and a flip for applying pressure to the pressing unit in a first direction.

In another aspect, embodiments of the present invention provide a display panel, a printed circuit board positioned around the display panel and processing voltage and signals for driving the display panel, and connected to the printed circuit board, and the voltage and A cable for transmitting a signal, a connector for connecting the printed circuit board and the cable, and a cover shield disposed on a rear surface of the display panel, wherein the connector is fixed on the printed circuit board and the cable is inserted, A display device can be provided, comprising: a housing for disposing a portion of a cable; a pressing unit arranged on the cable arranged on a printed circuit board; and a flip for applying pressure to the pressing unit in a first direction.

According to embodiments of the present invention, it is possible to provide a connector unit that minimizes contact resistance and a display device including the same.

According to embodiments of the present invention, it is possible to provide a connector unit and a display device including the same, which reduce the thickness of the connector so that the thickness of the display device can be reduced and the coupling force of the connector is not reduced.

1 is a schematic configuration diagram of a display device according to embodiments of the present invention.
2 is a side view showing an embodiment of a connector employed in embodiments of the present invention.
3 is a view illustrating a cross-section in which a printed circuit board and a cable are disposed by a housing according to embodiments of the present invention.
4 is a plan view illustrating a housing of a connector according to embodiments of the present invention.
5 is an exploded perspective view illustrating a portion in which a housing and a flip are connected in embodiments of the present invention.
6 is a cross-sectional view illustrating a portion to which a cover shield is attached in a display device according to an exemplary embodiment of the present invention.
7 is a graph illustrating an impedance change between a cable and a second printed circuit board in a display device according to embodiments of the present invention.
8 is a graph showing the degree of distortion of an image signal transmitted through a connector according to an embodiment of the present invention.
9 is a graph showing the degree of distortion of an image signal transmitted through a general connector.

Hereinafter, some embodiments of the present invention will be described in detail with reference to exemplary drawings. In adding reference numerals to components of each drawing, the same components may have the same reference numerals as much as possible even though they are indicated in different drawings. In addition, in describing the present invention, when it is determined that a detailed description of a related known configuration or function may obscure the gist of the present invention, the detailed description may be omitted.

In addition, in describing the components of the embodiments of the present invention, terms such as first, second, A, B, (a), (b), etc. may be used. These terms are only for distinguishing the elements from other elements, and the essence, order, order, or number of the elements are not limited by the terms. When it is described that a component is “connected”, “coupled” or “connected” to another component, the component may be directly connected or connected to the other component, but other components may be interposed between each component. It should be understood that each component may be “interposed” or “connected,” “coupled,” or “connected” through another component.

1 is a schematic configuration diagram of a display device 100 according to embodiments of the present invention.

Referring to FIG. 1 , in the display device 100 according to the present exemplary embodiments, a plurality of data lines and a plurality of gate lines are disposed, and a plurality of sub-pixels are disposed. and a driver circuit connected to the display panel 110 and driving each sub-pixel. The driver circuit may include a data driver 220 driving a plurality of data lines and a gate driver 230 driving a plurality of gate lines. Also, the display device 100 may include a timing controller 140 that controls the driver circuit. The display panel 110 may be a liquid crystal display panel using a liquid crystal cell or an organic light emitting display panel using an organic light emitting diode. However, the present invention is not limited thereto.

The data driver 220 may drive the plurality of data lines by supplying data voltages to the plurality of data lines. The gate driver 230 may sequentially drive the plurality of gate lines by sequentially supplying scan signals to the plurality of gate lines. Also, the timing controller 140 may supply various control signals to the driver circuit so that the sub-pixels can be driven. The timing controller 140 starts scanning according to the timing implemented in each frame, converts input image data input from the outside to match the data signal format used by the data driver 220, and converts the converted image data in this way. can be printed out. In addition, the timing controller 140 may control data driving at an appropriate time according to the scan.

The gate driver 230 may sequentially drive the plurality of gate lines by sequentially supplying a scan signal of an on voltage or an off voltage to the plurality of gate lines under the control of the timing controller 140 . . The gate driver 230 may be located only on both sides of the display panel 110 as shown in FIG. 1 , or may be located on one side in some cases, depending on a driving method or a panel design method. However, the present invention is not limited thereto.

Also, the gate driver 230 may include one or more gate driver integrated circuits. Each gate driver integrated circuit is connected to a bonding pad of the panel 110 by a tape automated bonding (TAB) method or a chip-on-glass (COG) method, or a gate in panel (GIP) method. It may be implemented as a type and directly disposed on the panel 110 , or may be integrated and disposed on the panel 110 in some cases. As shown in FIG. 1 , each gate driver integrated circuit may be implemented in a Chip On Film (COF) method. In this case, the gate driving chip 232 corresponding to each gate driver integrated circuit may be mounted on the flexible film 231 , and one end of the flexible film 231 may be bonded to the panel 110 . In this case, the gate driving chip 232 corresponding to each gate driver integrated circuit is mounted on a flexible film 231 , and one end of the flexible film 231 is at least one first printed circuit board 150 . is bonded, and the other end may be bonded to the panel 110 .

When a specific gate line is opened, the data driver 220 converts the image data received from the timing controller 140 into an analog data voltage and supplies it to the plurality of data lines, thereby driving the plurality of data lines. The data driver 220 may drive a plurality of data lines including at least one source driver integrated circuit. Each source driver integrated circuit is connected to a bonding pad of the panel 110 by a tape automated bonding (TAB) method or a chip-on-glass (COG) method, or disposed directly on the panel 110 . In some cases, it may be integrated and disposed on the panel 110 . In addition, each source driver integrated circuit, as shown in FIG. 1 , may be implemented in a Chip On Film (COF) method. In this case, the source driving chip 222 corresponding to each source driver integrated circuit is mounted on a flexible film 221 , and one end of the flexible film 221 is on at least one first printed circuit board 150 . is bonded, and the other end may be bonded to the panel 110 .

Referring to FIG. 1 , the first printed circuit board 150 may be connected to the second printed circuit board 160 through a cable 170 while being positioned around the panel 110 . The cable 170 may be a flexible flat cable (FFC). The first printed circuit board 150 receives the voltage and signal for driving the panel 110 from the second printed circuit board 160 and processes it. A timing controller 140 may be disposed on the second printed circuit board 160 . In addition, the second printed circuit board 160, the panel 110, the data driver 220, the gate driver 230, etc. to supply various voltages or currents or a power controller for controlling various voltages or currents to be supplied (not shown) ) may be further disposed. However, the present invention is not limited thereto. Meanwhile, the cable 170 may be connected to the first printed circuit board 150 and/or the second printed circuit board 160 through the connector 180 .

Figure 2 is a side view showing an embodiment of a connector employed in embodiments of the present invention, Figure 3 is a view showing a cross section in which a printed circuit board and a cable are arranged by the housing according to embodiments of the present invention, 4 is a plan view showing a housing of a connector according to embodiments of the present invention, and FIG. 5 is an exploded perspective view showing a portion where the housing and flip are connected in embodiments of the present invention.

2 to 5, the connector 180 is disposed on the printed circuit board 150, 160, the housing 181 having a window 191b having a predetermined size through which the inserted cable 170 is exposed; One side is disposed between the flip 182 and the housing 181 and the flip 182 for hinged coupling with the housing 181, and presses the cable 170 exposed to the window 191b by the flip 182 A pressing unit 185 may be included.

The housing 181 may align the positions of the cables 170 on the printed circuit boards 150 and 160 . The housing 181 may be disposed in a first direction in the longitudinal direction, and the cable 170 may be inserted into the housing 181 in a direction opposite to the first direction. The printed circuit boards 150 and 160 may be the first printed circuit board 150 or the second printed circuit board 160 of FIG. 1 . The cable 170 is disposed between the first printed circuit board 150 and the second printed circuit board 160 so that a voltage and/or a signal is transmitted from the second printed circuit board 160 to the first printed circuit board 150 . can be transmitted. The boards 150 and 160 and the cable 170 may include a plurality of pads 161 and 171 for transmitting signals to the outside, respectively, as shown in FIG. 3 . The pads 161 and 171 may be parts that are connected to an external device in patterns printed on the printed circuit boards 150 and 160 and the cable 170 to transmit signals. Further, if the alignment between the pads 161 of the printed circuit boards 150 and 160 and the pads 171 of the cable 170 is not correct, the contact resistance between the pads 161 and 171 may increase. Also, the signals transmitted to the printed circuit boards 150 and 160 and the cable 170 may be distorted. Accordingly, when the cable 170 is inserted into the housing 181 in a state where the housing 181 is disposed at a predetermined position on the printed circuit board 150 and 160 and is fixed, the printed circuit board 150 , 160 and the cable 170 are aligned. This can shorten the manufacturing time. The housing 181 may prevent the inserted cable 170 from going over the top of the window 191b. In addition, the housing 181 may be fixed on the printed circuit boards 150 and 160 , and the cable 170 may be inserted so that a portion of the cable 170 is disposed on the printed circuit boards 150 and 160 . A portion of the cable 170 disposed on the printed circuit boards 150 and 160 may include a pad 171 .

In addition, as shown in FIG. 3 , the pads 161 of the printed circuit boards 150 and 160 may be disposed on the printed circuit boards 150 and 160 on which the window 191b of the housing is disposed on the portion where the cable 170 is disposed. have. In addition, the pads 161 of the printed circuit boards 150 and 160 and the pads 171 of the cable 170 may be disposed in the window 191b provided in the housing 181 to face each other. In addition, the housing 180 is disposed on the upper end of the window 191b and the window 191b as shown in FIG. 4 and includes an upper end 181a having a hole h having a predetermined size, and a cable 170. It may include a lower end 181c having a fastening groove to be fastened, and a fastening pin 183 inserted into the hole h and having a first hook 181d having a predetermined size. Here, the hole h is illustrated as having a rectangular shape, but is not limited thereto. Also, the fastening pin 183 may have a different shape depending on the shape of the hole h.

The pressing part 185 is disposed on the window 191b and when a force is applied, the cable 170 exposed to the window 191b may not be separated from the printed circuit devices 150 and 160 . The shape of the pressing part 185 may be a rectangular parallelepiped. However, the present invention is not limited thereto. In addition, the pressing part 185 may be made of a rubber material. However, the present invention is not limited thereto, and any elastic body having an elastic force may be used.

The flip 182 has a first longitudinal direction and one side connected to the housing 181 serves as an axis, so that the flip 182 can rotate, and the flip 182 presses the pressing part 185 by the force that causes the shaft to rotate. can be pressed by applying The flip 182 includes a second hook 182a in which a hole h having a predetermined size is disposed, and a flip body 182 extending from the second hook 182a and applying pressure to the pressing part 185. can do. In addition, the flip 182 may be fixed to the housing 181 while the pressing part 185 is pressed by the latch 184 . And, as shown in FIG. 5 , the first hook 181d and the second hook 182a are fastened by the connecting pin 151 so that the flip 182 can rotate about the connecting pin 151 as an axis. have. Accordingly, the housing 181 and the flip 182 can be hinged. Also, the pads 161 of the printed circuit boards 150 and 160 and the pads 171 of the cable 170 may come into direct contact with each other by the connector 180 configured as described above. When the flip 182 applies a force F to the pressing part 185 disposed on the window 191b, the cable 170 disposed on the printed circuit boards 150 and 160 by the pressing part 185 is By applying force, the cable 170 in direct contact with the printed circuit boards 150 and 160 is pressed so that it is not easily separated from the printed circuit boards 150 and 160 .

In addition, the pads 161 of the printed circuit boards 150 and 160 and the pads 171 of the cable 170 that are in direct contact are fixed by the pressing part 185 to facilitate signal transmission. In addition, since the connector 180 allows the printed circuit boards 150 and 160 and the cable 170 to come into direct contact, the height h2 of the connector 180 can be lowered, thereby reducing the printed circuit boards 150 and 160 and the cable 170. Since the height h1 of the connected portion can be realized low, the display device 110 having a thin thickness can be realized.

6 is a cross-sectional view illustrating a portion to which a cover shield is attached in a display device according to an exemplary embodiment of the present invention.

Referring to FIG. 6 , a cover shield 200 may be disposed on the rear surface of the display device 100 . The cover shield 200 may be disposed on a portion of the rear surface of the display device 100 . A gasket 300 may be disposed outside the cover shield 200 . The printed circuit boards 150 and 160 are disposed in the cover shield 200 , and a cable 170 connected to the printed circuit boards 150 and 160 may extend to one side. In addition, the connector 180 may be disposed at a portion where the printed circuit boards 150 and 160 and the cable 170 are connected. In addition, as shown in FIG. 2 , a force F is applied to the pressing unit 185 by the flip 182 to the connector 180 so that the pressing unit 185 may be pressed. Accordingly, even if a pulling force is transmitted to the cable 170 in the first direction, the cable 170 may not be separated from the housing 181 . However, when a force is applied to the connector 180 in the second direction, the flip 182 can be released, and the cable connected by the connector 180 in the housing 181 by the force in the second direction ( 170) and the printed circuit boards 150 and 160 may be separated. However, as shown in FIG. 5 , when a protrusion 210 is formed inside the cover shield 200 and the protrusion 210 applies a force to the connector 180 in the opposite direction to the second direction, the force in the second direction Even if this is applied, it is possible to prevent the cable 170 from being separated from the printed circuit boards 150 and 160 . The point at which the protrusion 210 contacts the connector 180 may be the pressing part 185 . However, the point at which the protrusion 210 contacts the connector 180 is not limited thereto.

Table 1 below shows that the width exposed by the window 81b of the cable 170 disposed on the printed circuit board 150 is 0.3 mm and the pressing part 185 by the protrusion 210 of the cover shield 200 . ), the thickness of the pressing part 185 is increased by 0.1 mm in a state where the force is applied, and the result of measuring the pulling force of the connector 180 is shown. The pulling force may mean a force required to loosen the connector 180 in a state in which it is fastened. That is, the contactor 180 is not released when a force lower than the pulling force is applied. The reference thickness of the pressing part 185 is the thickness when the flip 182 is combined with the housing 181 without the pressing part 185, that is, the height (h2) of the connector 180 measured in the state without the pressing part 185. ) can be

Holding force (kgf) 0.1mm pressurization Sample 1 0.252 Sample 2 0.258 Sample 3 0.195 Average 0.235 0.2mm pressurized Sample 1 0.811 Sample 2 0.843 Sample 3 0.924 Average 0.859 0.3mm pressurization Sample 1 0.98 Sample 2 1.09 Sample 3 1.24 Average 1.170 0.4mm pressurized Sample 1 1.093 Sample 2 1.136 Sample 3 1.316 Average 1.182

As shown in Table 1 above, the pulling force was measured using three samples, and the pulling force of the connector 180 was measured by increasing the pressing part 185 by 0.1 mm from the reference thickness for each sample. . It can be seen that the pulling force increases as the thickness of the pressing part 185 increases. In addition, if the length of the protrusion 210 of the cover shield 200 is increased instead of increasing the thickness of the pressing part 185 , the same effect may be obtained. Here, the cross section of the protrusion 210 of the cover shield 200 is illustrated as having a triangular shape, but is not limited thereto.

7 is a graph illustrating an impedance change between a cable and a second printed circuit board in a display device according to embodiments of the present invention.

Referring to FIG. 7 , section A represents the magnitude of the impedance in the second printed circuit board 160 , and section B represents the magnitude of the impedance at the portion fastened by the connector 180 . In addition, section C represents the magnitude of the impedance in the cable 170 .

Here, the a curve shows the impedance measurement in a state pressurized by 0.2 mm by the pressing part, and the b curve shows the impedance measurement in a state pressurized by 0.3 mm by the pressing part. In addition, the c curve shows the impedance measurement in a state pressurized by 0.4 mm by the pressing part. In addition, the d curve represents the measurement of impedance in the general connector 180 .

In addition, the printed circuit boards 150 and 160, the cable 170, and the connector 180 are designed to be impedance-matched to 100 Ω by design. Therefore, the magnitude of the impedance measured in each section is most preferably close to 100Ω. And, looking at the a curve to the d curve, it can be seen that the d curve has the largest difference between the lower value and the upper value of 100 Ω. Also, it can be seen that the a curve is the closest to 100Ω for both the upper and lower values. Accordingly, it can be seen that it is very advantageous for signal transmission when the pressing part 185 and the protrusion 210 of the cover shield 200 press the overlapping portions of the printed circuit boards 150 and 160 and the cable 170 .

Here, the impedance of the connection point between the second printed circuit board 160 and the cable 170 and the connector 180 was measured, but the first printed circuit board 150 and the cable 170 and the connector 180 were connected. It can be seen that the same can be measured for points.

8 is a graph showing the degree of distortion of the video signal transmitted through the connector when the connector according to the embodiments of the present invention is used, and FIG. 9 is a graph showing the degree of distortion of the video signal transmitted through the general connector.

Referring to FIGS. 8 and 9 , the x-axis is a time axis and the y-axis is a voltage magnitude axis. In addition, since the image signal is a differential signal, a high state and a low state may appear at the same time, and an empty space in the form of a rhombus may be displayed in the center. Here, the rhombic shape is not an exact rhombic shape, but a rhombus is displayed by connecting an imaginary line to an empty space. And, it can be determined whether the signal is distorted by using the size of the rhombus, and when the size of the rhombus is large, it can be seen that the degree of distortion of the signal is small.

In order to determine the size of the rhombus, the length to the upper vertex and the length to the lower vertex based on the imaginary horizontal line in the center of the rhombus are referred to as d11 and d12 in FIG. 8, respectively, and d21 and d22 in FIG. 9, respectively. In addition, in FIG. 8, the length to the left vertex and the length to the right vertex based on the virtual vertical line in the center of the rhombus are referred to as c11 and c21, respectively, and in FIG. 9, the length to the left vertex based on the virtual vertical line in the center of the rhombus and the length to the right vertex were called c21 and c22, respectively.

In FIG. 8 , C11 was measured to be 117.6 and the length of C12 was measured to be 109.6, and in FIG. 9 , C21 was measured to be 107.2 and C22 was measured to be 92.8. Also, in FIG. 8 , D11 was measured to be 147.58 mV and D12 was measured to be 120.97 mV, and in FIG. 9 , D21 was measured to be 114.0 mV and D22 was measured to be 87.10 mV. That is, it can be seen that the size of the rhombus is larger in the case of FIG. 8 than in FIG. 9 . Accordingly, it can be seen that the characteristics of the signal are further improved when the connector according to the embodiments of the present invention is employed.

The above description and the accompanying drawings are merely illustrative of the technical idea of the present invention, and those of ordinary skill in the art to which the present invention pertains can combine configurations within a range that does not depart from the essential characteristics of the present invention. , various modifications and variations such as separation, substitution and alteration will be possible. Therefore, the embodiments disclosed in the present invention are not intended to limit the technical spirit of the present invention, but to explain, and the scope of the technical spirit of the present invention is not limited by these embodiments. The protection scope of the present invention should be construed by the following claims, and all technical ideas within the equivalent range should be construed as being included in the scope of the present invention.

100: display device
110: display panel
140: timing controller
150: first printed circuit board
160: second printed circuit board
170: cable
180: connector
220: data driver
230: gate driver

Claims (11)

display panel;
a printed circuit board positioned around the display panel for processing voltages and signals for driving the display panel;
a cable connected to the printed circuit board and transmitting a voltage and a signal to the printed circuit board;
a connector connecting the printed circuit board and the cable; and
Including a cover shield disposed on the rear surface of the display panel,
The connector includes a housing fixed on a printed circuit board and a cable inserted therein so that a portion of the cable is disposed on the printed circuit board, and a pressing unit disposed on the cable disposed on the printed circuit board; a flip for applying pressure to the compression unit;
and a protrusion contacting the pressing part inside the cover shield.
delete delete delete delete delete delete delete delete According to claim 1,
The housing includes a window through which the cable is exposed; an upper end disposed on the window and an upper end of the window and having a hole having a predetermined size; A display device comprising a fastening pin having a first hook having a size of .
11. The method of claim 10,
The flip includes a second hook having a hole having a predetermined size disposed therein, a flip body extending from the second hook and applying the pressure to the pressing part, and being inserted into the first hook and the second hook A display device connected to the first hook by a connecting pin.

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