GB2434043A - Determining when a display is correctly connected to a hot-plug extension device - Google Patents

Determining when a display is correctly connected to a hot-plug extension device Download PDF

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Publication number
GB2434043A
GB2434043A GB0600118A GB0600118A GB2434043A GB 2434043 A GB2434043 A GB 2434043A GB 0600118 A GB0600118 A GB 0600118A GB 0600118 A GB0600118 A GB 0600118A GB 2434043 A GB2434043 A GB 2434043A
Authority
GB
United Kingdom
Prior art keywords
extension device
lcd display
detecting
hot
display
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
GB0600118A
Other versions
GB0600118D0 (en
Inventor
Chung-Ming Leng
Feng-Shii Tsai
Ken-Su Chen
Sy-Shang Chen
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Chuntex Electronic Co Ltd
Original Assignee
Chuntex Electronic Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Chuntex Electronic Co Ltd filed Critical Chuntex Electronic Co Ltd
Priority to GB0600118A priority Critical patent/GB2434043A/en
Publication of GB0600118D0 publication Critical patent/GB0600118D0/en
Publication of GB2434043A publication Critical patent/GB2434043A/en
Withdrawn legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
    • G01R31/66—Testing of connections, e.g. of plugs or non-disconnectable joints
    • G01R31/67—Testing the correctness of wire connections in electric apparatus or circuits
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H11/00—Emergency protective circuit arrangements for preventing the switching-on in case an undesired electric working condition might result
    • G01R31/041—
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
    • G01R31/66—Testing of connections, e.g. of plugs or non-disconnectable joints
    • G01R31/68—Testing of releasable connections, e.g. of terminals mounted on a printed circuit board
    • G01R31/69—Testing of releasable connections, e.g. of terminals mounted on a printed circuit board of terminals at the end of a cable or a wire harness; of plugs; of sockets, e.g. wall sockets or power sockets in appliances
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
    • H02H9/001—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection limiting speed of change of electric quantities, e.g. soft switching on or off
    • H02H9/004—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection limiting speed of change of electric quantities, e.g. soft switching on or off in connection with live-insertion of plug-in units

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)

Abstract

An LCD display 20 comprises a microprocessor 21 with a detecting port 1 connected to at least two switches 22,23 and a signal out port 2 connected to a power switch 26. The microprocessor 21 judges if the extension device 10 is correctly connected to the LCD display 20 using switches 22,23, and may decide if the power is allowed to activate the extension device 10. Switches 22,23 may be connected to detection pins 11,12 in the hot-plug extension device. Power switch 26 may be connected to the signal out pin through a delay circuit (fig 2, 25), that may comprise a resistor and a capacitor. A delay may be provided by the microprocessor 21. Power switch 26 may be connected to the signal out pin through an overcurrent protecting circuit 27. Switches 22,23 may be formed by transistors (fig 2) or diodes. Hot-plug extension device 10 may be for example a set top box, a card reader or a multimedia player.

Description

<p>HOT-PLUG EXTENSION DEVICE AND A DISPLAY HAVING THE</p>
<p>HOT-PLUG EXTENSION DEVICE</p>
<p>I. Field of the invention</p>
<p>The present invention relates to a hot-plug extension device for a display and, and particularly relates to a hot-plug extension device that can be coup]ed to a display safely and provide extension functions for the display.</p>
<p>2. Description of the Related Art</p>
<p>Display is developed from CRT (Cathode Ray Tube) to LCD (Liquid Crystal Display). As the LCD display develops, manufactures also add different equipment in the display to extend its functions,for example, a speaker and a TV signal receiving port.</p>
<p>However, the extension ability of the LCD display is limited by its built-in equipment.</p>
<p>Therefore, the invention provides a hot-plug extension device for a display to mitigate or obviate the aforementioned problems.</p>
<p>The main objective of the present invention is to provide a hot-plug extension device for a display to provide more supplementary functions.</p>
<p>Another objective of the present invention is to provide an LCD display capable of safely connecting the foregoing hot-plug extension device.</p>
<p>The LCD display has a microprocessor with a detecting pin, a signal-out pin and a power pin, tl.e detecting pin connected to at least two detecting switches; a power switch is connected to the signal-out pin and the power pin; and the two detecting switches and the power switch are connected to the hot-plug extension device.</p>
<p>The microprocessor in the LCD display determines if the extension device is connected to the LCD display coiTectly, then the power in the LCD display activates the extension device to avoid any damages resulted from abnormal power supply. Other objectives, advantages and novel features of the invention will become more apparent from the following detailed description when taken in conjunction with the accompanying drawings.</p>
<p>In the drawmgs Fig. 1 is a block diagram of a hot-plug extension device of a first embodiment in accordance with this invention, wherein the hot-plug extension device is a TV box; Fig. 2 is a circuit diagram of a display being connected to the hot-plug extension device in accordance with this invention; and Fig. 3 is another embodiment of the display being connected to the extension device in accordance with the present invention.</p>
<p>A hot-plug extension device for a display in accordance with the present invention may be a set top box, a TV box, a card reader, or a multimedia player etc, which provides extension functions to the display.</p>
<p>With reference to Figs. 1-2, the hot-plug extension device (10) is a TV box in this embodiment as an example. The hot-plug extension device (10) to be connected to an LCD display (20) includes a power terminal, an audio terminal an analog image signal port(D-SUB), a digital image signal port..</p>
<p>If the extension device (10) is incorrectly connected to the LCD display (20) or not reliably in coniact with the LCD device (20), the connection can cause a possible damage to the extension device (10) or the display (20).</p>
<p>Therefore, detecting pins are proposed in this invention to judge whether or not the connection between the extension device (10) and the LCD display (20) is correct. In detail, the detecting pins can be optionally formed in the extension device (10). The extension device (1 0) has a circuit board with multiple pins thereon. These pins comprise functions of signal transmission, power supplymg, detecting, etc. The detecling pins can be formed on two proximal ends or in a middle of the circuit board.</p>
<p>In Fig. 2, the extension device (10) has three detecting pins (11), (12), and (13) in addition to the standard pins. The display (20) has a microprocessor (21), which has a detecting port, a power pin (VCC), and a signal out pin.</p>
<p>The detecting terminal of the microprocessor (21) is connected to three transistors that server as three detecting switches (22), (23), and (24). Bases of the three transistors are respectively connected to the three detecting pins (11), (12) and (13). Emitters of all the transistors are coupled together to a ground, and collectors of all the transistors are connected to the detecting port of the microprocessor (21). Furthermore, the detecting port of the microprocessor (21) is connected to a delay circuit (25) with a delay time constant composed of resistors and capacitors The delay circuit (25) is connected to a power switch (26) The power switch (26) composed of two transistors and a resistor is to be connected to the power pins in the extension device (10).</p>
<p>The power pin (V CC) is connected to the power switch (26) through an over current protecting circuit (27), and the power pin (VCC) is also connected to the three detecting switches (22), (23), and (24).</p>
<p>\\Then the three detecting pins (11), (12) and (13) are coupled to the colTesponding delecting switches (22), (23), and (24), the detecting port of the microprocessor (21) determmes if the connection is correct based on the voltage potential. If the conneclion is correct, the microprocessor (21) outputs a driving signal to the delay circuit (25) from the signal-out pin. After several milliseconds (depending on the delay lime constant), the power switch (26) is activated, and the power in the display (20) is allowed to be transmitted to the extension device (10), served as an operating voltage of the extension device (10).</p>
<p>In contrast, if the detecting pins (11), (12) and (13) are connected incorrectly to the LCD display (20), the detecting port of the microprocessor (21) cannot detect a right potential. Accordingly, no driving signal is output to the delay circuit (25). The extension device (1 0) will not be damaged due to the wrong connection.</p>
<p>Fig. 3 shows another embodiment of this invention, the detecting switches (22), (23) and (24) are formed by three diodes, and the delay function is performed by the microprocessor (21), i.e. the delay circuit (25) is omitted. The microprocessor (21) sets a delay time and controls the power switch (26) directly.</p>
<p>If the extension device (10) is connected correctly, after the delay time, the microprocessor (21) will give a driving signal to the power switch (26) and provide operating voltage to the extension device (10).</p>

Claims (1)

  1. <p>CLAIMS: 1. An LCD display (20) capable of connecting to a hot-plug
    extension device (10), the LCD display comprising: a microprocessor (21) having a detecting port, a signal-out pin and a power pin, the detecting pin connected to at least two detecting switches(22,23); and a power switch (26) connected to the signal-out pin and the power pin; whcrein the at least two detecting switches (22,23) and the power switch are to be connected to the hot-plug extension device (10), and whether the LCD display (20) correctly connects to the hot-plug extension device (10) is determined using the at least two detecting switches (22,23).</p>
    <p>2. The LCD display as claimed in claim 1, wherein the signal-out pin is connected to the power switch through a delay circuit (25).</p>
    <p>3. The LCD display as claimed in claim 1, wherein the power pin of the microprocessor is connected to the power switch through an over current protecting circuit (27).</p>
    <p>4. The LCD display as claimed in claim 3, wherein the detecting switches (22,23) are formed by transistors.</p>
    <p>5. The LCD display as claimed in claim 3, wherein the detecting switches (22,23) are formed by diodes.</p>
    <p>6. The LCD display as claimed in claim 4, wherein emitters of the transistors (22,23) arc coupled to a ground, collectors of the transistors are connected to the detecting port of the microprocessor (21).</p>
    <p>7. The LCI) display as claimed in claim 2, wherein the delay circuit (25) comprises a resistor and a capacitor.</p>
    <p>8. An hot-plug extension device for the LCD display as claimed in claim 1, the hot-plug extension device comprising: a circuit with multiple pins formed thereon to be connected to the LCD display, the multiple pins comprising at least two detecting pins (II, 1 2), wherein the detecting pins are connected to the detecting switches of the LCD display (20) to change a voltage potential of the detecting port.</p>
GB0600118A 2006-01-05 2006-01-05 Determining when a display is correctly connected to a hot-plug extension device Withdrawn GB2434043A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB0600118A GB2434043A (en) 2006-01-05 2006-01-05 Determining when a display is correctly connected to a hot-plug extension device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB0600118A GB2434043A (en) 2006-01-05 2006-01-05 Determining when a display is correctly connected to a hot-plug extension device

Publications (2)

Publication Number Publication Date
GB0600118D0 GB0600118D0 (en) 2006-02-15
GB2434043A true GB2434043A (en) 2007-07-11

Family

ID=35911397

Family Applications (1)

Application Number Title Priority Date Filing Date
GB0600118A Withdrawn GB2434043A (en) 2006-01-05 2006-01-05 Determining when a display is correctly connected to a hot-plug extension device

Country Status (1)

Country Link
GB (1) GB2434043A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101364091B (en) * 2007-08-07 2012-04-11 深圳迈瑞生物医疗电子股份有限公司 Electric supply interface arrangement for external equipment and interface electric supply method
US20210303046A1 (en) * 2020-03-24 2021-09-30 Abb Power Grids Switzerland Ag Protected power and data bus connection of peripheral device and host device

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2203560A (en) * 1987-04-18 1988-10-19 Heidelberger Druckmasch Ag Testing electric cable connections
JPH11249763A (en) * 1998-02-27 1999-09-17 Toshiba Corp Computer system

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2203560A (en) * 1987-04-18 1988-10-19 Heidelberger Druckmasch Ag Testing electric cable connections
JPH11249763A (en) * 1998-02-27 1999-09-17 Toshiba Corp Computer system

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101364091B (en) * 2007-08-07 2012-04-11 深圳迈瑞生物医疗电子股份有限公司 Electric supply interface arrangement for external equipment and interface electric supply method
US20210303046A1 (en) * 2020-03-24 2021-09-30 Abb Power Grids Switzerland Ag Protected power and data bus connection of peripheral device and host device
US11372462B2 (en) * 2020-03-24 2022-06-28 Hitachi Energy Switzerland Ag Protected power and data bus connection of peripheral device and host device

Also Published As

Publication number Publication date
GB0600118D0 (en) 2006-02-15

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WAP Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1)