JP2005274885A - Video display device equipped with plasm display panel - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a video display device equipped with a plasma display panel which prevents intrusion of dust from an air circulation hole formed on an upper surface of a device main body as much as possible. <P>SOLUTION: The video display device is equipped with an opening/closing member to open and close the air circulation hole formed on the upper surface of the device main body and which always closes the air circulation hole, an opening/closing member driving device to transfer the opening/closing member to a closing position to close the air circulation hole and an opening position to open the air circulation hole, a cooling fan provided in the device main body, a fan driving circuit to drive the cooling fan, a temperature detector to detect temperature in the device main body and a control means for controlling the fan driving circuit and the opening/closing member driving device based on the detected temperature of the temperature detector. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an image display device provided with a plasma display panel (PDP).

  In a video display device such as a television receiver equipped with a PDP, the temperature inside the device main body tends to rise due to heat generated by the PDP or the like. Therefore, a video display device provided with a PDP is provided with a plurality of cooling fans in the device body in order to prevent a temperature rise in the device body. And the air circulation hole for heat discharge is opened in the apparatus main body in the location where the cooling fan is installed. In a video display device provided with a PDP, air circulation holes are generally formed in the back surface and the top surface of the back cover of the device body.

Thus, when the air circulation hole is opened in the upper surface of the back cover, dust may enter the apparatus main body from the air circulation hole and the circuit board may be broken.
Japanese Patent Laid-Open No. 5-13974

  It is an object of the present invention to provide an image display device including a plasma display panel that can prevent dust from entering through air circulation holes formed on the upper surface of the device body as much as possible.

  According to a first aspect of the present invention, there is provided a video display device having a plasma display panel and having air circulation holes formed on the back and top surfaces of the apparatus body. An opening / closing member that normally closes the air circulation hole, an opening / closing member drive for moving the opening / closing member to a closed position for closing the air circulation hole, and an open position for opening the air circulation hole Device, cooling fan provided in the device body, fan drive circuit for driving the cooling fan, temperature detector for detecting the temperature in the device body, and fan drive based on the detected temperature of the temperature detector Control means for controlling the circuit and the opening / closing member driving device is provided.

  According to a second aspect of the present invention, in the first aspect of the present invention, the control means controls the fan drive circuit so as to drive the cooling fan when the temperature detected by the temperature detector exceeds a predetermined temperature. At the same time, the opening / closing member driving device is controlled so as to move the opening / closing member to the open position, and when the temperature detected by the temperature detector becomes a predetermined temperature or less, the fan driving circuit is controlled so as to stop the cooling fan and the opening / closing is also performed. The opening / closing member driving device is controlled so as to move the member to the closed position.

  According to a third aspect of the present invention, in the first aspect of the present invention, the control means controls the fan driving circuit to drive the cooling fan when the temperature detected by the temperature detector exceeds a predetermined temperature. At the same time, the opening / closing member driving device is controlled so as to move the opening / closing member to the open position, and when the temperature detected by the temperature detector becomes a predetermined temperature or less, the fan driving circuit is controlled so as to stop the cooling fan and the opening / closing is also performed. Means for controlling the opening / closing member driving device to move the member to the closed position, and means for controlling the opening / closing member driving device to move the opening / closing member to the closed position when the power is off. .

  According to the present invention, it is possible to prevent dust from entering from the air circulation hole formed in the upper surface of the apparatus main body as much as possible.

  DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention applied to a television receiver equipped with a PDP will be described below with reference to the drawings.

  FIG. 1 shows the appearance of the rear side of a television receiver equipped with a PDP.

  A rear portion of the television receiver provided with the PDP is covered with a back cover 100. The back cover 100 includes a back wall, an upper wall, a lower wall, and both side walls. A first air circulation part 110 and a second air circulation part 120 are formed on the upper surface wall of the back cover 100 so as to sandwich the center of the width. The 1st air circulation part 110 is comprised from the three vertically long slit-shaped air circulation holes 111 formed along with the horizontal direction. The second air circulation part 120 is also composed of three vertically elongated air circulation holes 121 formed side by side in the horizontal direction.

  A third air circulation part 130 and a fourth air circulation part 140 are formed on the back wall of the back cover 100 so as to sandwich the center of the width. The 3rd air circulation part 130 is comprised from the three vertically long slit-shaped air circulation holes 131 formed along with the horizontal direction. The fourth air circulation part 140 is also composed of three vertically elongated air circulation holes 141 formed side by side in the horizontal direction. Cooling fans 1 (see FIG. 3) are provided inside the first to fourth air circulation units 110 to 140, respectively.

  As shown in FIGS. 2 (a) and 2 (b), an air circulation hole 111 of the air circulation part 110 is opened and closed inside the first air circulation part 110 formed on the upper surface wall of the back cover 100. The opening / closing member 3 is attached to be slidable in the lateral direction along the inner surface of the upper surface wall of the back cover 100. The opening / closing member 3 is closed by the solenoid 4 (see FIG. 3) to close the air circulation hole 111 (the position shown in FIG. 2A) and the open position to open the air circulation hole 111 (FIG. 2B). Position). Although not shown, similarly, an opening / closing member for opening and closing the air circulation hole 121 is provided along the inner surface of the upper surface wall of the back cover 100 inside the second air circulation portion 120 formed on the upper surface wall of the back cover 100. And is slidable horizontally. This opening / closing member is also reciprocated by a solenoid.

  Normally, the air circulation holes of the air circulation portions 110 and 120 are closed by an opening / closing member, and when the solenoid is activated (ON state), the opening / closing member is in the open position (the position shown in FIG. 2B). ) And the air circulation holes of the air circulation portions 110 and 120 are opened. When the air circulation holes of the air circulation portions 110 and 120 are in the open state, the opening / closing member moves to the closed position (position shown in FIG. 2A) when the solenoid is inactivated (off state). Thus, the air circulation holes of the air circulation units 110 and 120 are closed.

  FIG. 3 shows the configuration of a cooling fan and an opening / closing member control circuit provided in a television receiver equipped with a PDP.

  In FIG. 3, for convenience of explanation, only one cooling fan among the four cooling fans 1 is illustrated, but the other cooling fans are similarly controlled. For convenience of explanation, only the solenoid 4 that drives one of the two opening / closing members 3 is shown, but the solenoid that drives the other opening / closing member is controlled in the same manner.

  The cooling fan 1 is driven by a fan drive circuit 2. The fan drive circuit 2 is controlled by a control unit 10 such as a microcomputer that controls the entire television receiver. The solenoid 4 that drives the opening / closing member 3 is controlled by the control unit 10. A temperature detector 5 is connected to the control unit 10. In addition, an operation signal from the main body operation unit 11 is input to the control unit 10. Further, an operation signal from the remote controller 12 is input to the control unit 10 via the remote controller light receiver 13.

  The main body operation unit 11 is provided with a main body power off key for turning off power other than the control unit 10 and the main body operation unit 11. A state in which power other than the control unit 10 and the main body operation unit 11 is turned off is referred to as a main body power off state. When the main body power off key is operated in the power on state or in the standby state described later, a main body power off command is input to the control unit 10 and the main body power off state is entered. When the main body power off key is operated in the main body power off state, a power on command is input to the control unit 10 and the power on state is entered.

  The remote control 12 is provided with a standby command input key for turning off power other than the control unit 10, the main body operation unit 11, and the remote control light receiver 13. A state in which power other than the control unit 10, the main body operation unit 11, and the remote control light receiver 13 is turned off is referred to as a standby state. When the standby command input key is operated while the power is on, the standby command is input to the control unit 10 and the standby state is entered. However, if the cooling fan 1 is driven when a standby command is input, the cooling fan 1 is driven for a certain period of time and then enters a standby state. When the standby command input key is operated in the standby state, a power-on command is input to the control unit 10 and the power-on state is entered.

  FIG. 4 shows a control processing procedure of the cooling fan 1 and the solenoid 4 by the control unit 10.

  When the power is turned on (step S1), it is determined whether or not the detected temperature T of the temperature detector 5 exceeds a predetermined temperature Ts (step S2). When it is determined that the detected temperature T exceeds the predetermined temperature Ts, the cooling fan 1 is driven (ON state) and the solenoid 4 is operated (ON state) (steps S3 and S4). Accordingly, the cooling fan 1 is driven and the air circulation holes 111 and 121 of the first and second air circulation portions 110 and 120 are opened. Thereafter, the process proceeds to step S7.

  When it is determined in step S2 that the detected temperature T is equal to or lower than the predetermined temperature Ts, the cooling fan 1 is stopped (off state) and the solenoid 4 is inactivated (off state) (step) S5, S6). Therefore, when the cooling fan 1 is in a driving state, the cooling fan 1 is stopped. Further, when the solenoid 4 is in the activated state, the solenoid 4 is inactivated, and the air circulation holes 111 and 121 of the first and second air circulation portions 110 and 120 are closed by the opening / closing member. . Thereafter, the process proceeds to step S7.

  In step S7, it is determined whether or not a main body power-off command has been input. When the main body power off command is not input, it is determined whether or not a standby command is input (step S9). When the standby command is not input, the process returns to step S1.

  If it is determined in step S7 that the main body power off command has been input, the main body power is turned off (step S8). That is, since the power supply other than the control unit 10 and the main body operation unit 11 is turned off, the cooling fan 1 is stopped and the air circulation holes 111 and 121 of the first and second air circulation units 110 and 120 are stopped. Is closed by an opening / closing member. Then, it returns to step S1.

  If it is determined in step S9 that a standby command has been input, it is determined whether or not the cooling fan 1 is in a driving state (step S10). When the cooling fan 1 is in a stopped state, the cooling fan 1 is set in a standby state (step S11). That is, since the power supply other than the control unit 10, the main body operation unit 11 and the remote control light receiver 13 is turned off, the cooling fan 1 is stopped and the air in the first and second air circulation units 110 and 120 is stopped. The circulation holes 111 and 121 are closed by the opening / closing member. Then, the process returns to step S1.

  When it is determined in step S10 that the cooling fan 1 is in a driving state, the power supply other than the fan driving circuit 2, the control unit 10, the main body operation unit 11 and the remote control light receiver 13 of the cooling fan 1 is turned off. (Step S12). A timer (soft timer) for measuring a predetermined time is started (step S13).

  Then, it is determined whether or not the timer has expired (whether a predetermined time has elapsed) (step S14). If the timer has not expired, it is determined whether or not a main unit power-off command has been input (step S15). If the main body power-off command has not been input, it is determined whether or not the power has been turned on (step S16). If the power is not turned on, the process returns to step S14. In this way, Steps S14, S15, and S16 are repeated, and when the timer expires, the standby state is set (Step S11). That is, since the power supply other than the control unit 10, the main body operation unit 11 and the remote control light receiver 13 is turned off, the cooling fan 1 is stopped and the air in the first and second air circulation units 110 and 120 is stopped. The circulation holes 111 and 121 are closed by the opening / closing member. Then, the process returns to step S1.

  If it is determined in step S15 that the main unit power-off command has been input, the timer is reset (stopped) (step S17), and then the main unit power is turned off (step S18). That is, since the power supply other than the control unit 10 and the main body operation unit 11 is turned off, the cooling fan 1 is stopped and the air circulation holes 111 and 121 of the first and second air circulation units 110 and 120 are stopped. Is closed by an opening / closing member. Then, it returns to step S1.

  If it is determined in step S16 that the power is turned on, the timer is reset (stopped) (step S19), and the process returns to step S2.

  The average luminance value of the video signal per screen displayed on the television receiver is monitored, and the cooling fan 1 is driven even when the average luminance value in a predetermined time unit over a plurality of screens is larger than the predetermined value ( The solenoid 4 may be in an activated state (on state).

It is a perspective view which shows the external appearance of the back side of the television receiver provided with PDP. FIG. 3 is an enlarged perspective view showing a first air circulation part 110 formed on the upper surface wall of the back cover 100 and an opening / closing member 3 for opening and closing the first air circulation part 110. It is a block diagram which shows the structure of the control circuit of the cooling fan and opening / closing member which were provided in the television receiver provided with PDP. 4 is a flowchart showing a control processing procedure of the cooling fan 1 and the solenoid 4 by the control unit 10.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Cooling fan 2 Fan drive circuit 3 Opening / closing member 4 Solenoid 5 Temperature detector 10 Control part 11 Main body operation part 12 Remote control 13 Remote control light receiver 110,120 Air distribution part 111,121 Air distribution hole

Claims (3)

In a video display device comprising a plasma display panel and having air circulation holes formed on the back and top surfaces of the device body,
An opening and closing member for opening and closing an air circulation hole formed on the upper surface of the apparatus main body, the opening and closing member always closing the air circulation hole;
An opening / closing member driving device for moving the opening / closing member to a closed position for closing the air circulation hole and an open position for opening the air circulation hole;
A cooling fan provided in the device body,
Fan drive circuit for driving the cooling fan,
A temperature detector for detecting the temperature in the apparatus main body, and a control means for controlling the fan driving circuit and the opening / closing member driving device based on the temperature detected by the temperature detector;
An image display device comprising a plasma display panel. The control means controls the fan drive circuit so as to drive the cooling fan when the temperature detected by the temperature detector exceeds a predetermined temperature, and controls the open / close member drive device so as to move the open / close member to the open position. The fan drive circuit is controlled to stop the cooling fan and the open / close member drive device is moved to move the open / close member to the closed position when the temperature detected by the temperature detector falls below a predetermined temperature. An image display apparatus comprising the plasma display panel according to claim 1. The control means
When the temperature detected by the temperature detector exceeds a predetermined temperature, the fan drive circuit is controlled to drive the cooling fan and the opening / closing member drive device is controlled to move the opening / closing member to the open position. Means for controlling the fan drive circuit to stop the cooling fan and moving the opening / closing member drive device to move the opening / closing member to the closed position, and when the power is off. 2. An image display apparatus comprising a plasma display panel according to claim 1, further comprising means for controlling the opening / closing member driving device so as to move the opening / closing member to the closed position.

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