CN1115660C - Liquid crystal monitor designed with liquid crystal display panel protective circuit - Google Patents

Liquid crystal monitor designed with liquid crystal display panel protective circuit Download PDF

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CN1115660C
CN1115660C CN 98105489 CN98105489A CN1115660C CN 1115660 C CN1115660 C CN 1115660C CN 98105489 CN98105489 CN 98105489 CN 98105489 A CN98105489 A CN 98105489A CN 1115660 C CN1115660 C CN 1115660C
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signal
liquid crystal
panel
crystal display
display panel
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CN 98105489
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CN1229227A (en
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吴宗训
游国钦
吴高扬
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明碁电脑股份有限公司
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Abstract

一种液晶监视器,包含一接收电路,用来接收图象信号、电源控制信号以及面板控制信号,该液晶显示面板,用来显示该图象信号,并依据一面板启动信号来控制;该面板启动信号的输入时间需较该图象信号的输入时间延迟一预定时间段;电源供应器用来依据该电源控制信号来对该液晶显示面板提供电源并同时产生一电源启动信号;保护电路,用来将该电源启动信号延迟至少该预时间段,以及依据该被延迟的电源启动信号及该面板控制信号来产生该面板启动信号。 A liquid crystal monitor, comprising a receiver circuit for receiving an image signal, the power control signal and panel control signal, the liquid crystal display panel for displaying the image signal, and based on a start signal to the control panel; the panel start time for an input signal representing a delay time of the input image signal a predetermined period of time; the power supply to provide power to the liquid crystal display panel according to the power control signal and simultaneously generating a power-up signal; protection circuit for the power-on signal at least delaying the pre-period, the panel and generating an activation signal according to the power-on signal is delayed and said panel control signal.

Description

设有液晶显示面板保护电路的液晶监视器 The liquid crystal display panel provided with a liquid crystal monitor protection circuit

本发明系提供一种液晶监视器,尤指一种设有液晶显示面板保护电路的液晶监视器。 The present invention provides a liquid crystal monitor, particularly to a liquid crystal display panel provided with a liquid crystal monitor protection circuit.

液晶显示面板(liquid crystal display panel)常用于可携式电脑(portabe computer)之上,例如像笔记型电脑或掌上型电脑等等。 The liquid crystal display panel (liquid crystal display panel) used on top of the portable computer (portabe computer), such as for example a laptop or palmtop computers and the like. 液晶显示面板的输入信号中包含有一图象信号以及一面板启动信号。 The liquid crystal display panel of the input signal comprising an image signal and a start signal panel. 图象信号内含有需要由液晶显示面板显示的信息,而面板启动信号则是用来控制液晶显示面板显示动作的开始或结束。 An image signal comprising the information display panel of a liquid crystal display needs, the panel signal is used to control the start of the liquid crystal display panel to display the start or end operation. 液晶显示面板的厂商对图象信号及面板启动信号的输入时间都有严格的规定,通常会要求面板启动信号的输入时间要比图象信号的输入时间延迟一预定时段例如为120ms,以避免液晶显示面板会因为直流充电而遭致损害。 Manufacturers of liquid crystal display panel and the panel image signal input time start signal has stringent regulations often requires input time than the time the panel video signal the start signal delayed by a predetermined period of 120ms, for example, to prevent the liquid crystal the display panel may be compromised because of the charging current.

在可携式电脑中液晶显示面板的面板启动信号及图象信号的输入时间都是由电脑的显示控制电路例如像VGA(video graphic array)电路来直接控制的,因此可以确定这种输入时序可以严格的被遵守。 In the liquid crystal display panel of the portable computer of the start signal and the panel image signal input time is computerized, for example, a display control circuit as VGA (video graphic array) to directly control the circuit, it is possible to determine the timing of such input can It is strictly adhered to. 但是当液晶显示面板被设于监视器内而形成一与电脑独立的液晶监视器时,由于这些输入信号需要经由一条外接的输入电缆线来传入液晶监视器,而且液晶监视器本身亦自备有可单独启动的电源电路,因此即使由电脑传来的输入信号的时序可符合液晶显示面板的输入时序要求,但这些输入信号有可能会因为各种无法预料的状况例如像电缆线的意外插拔动作或是液晶监视器的开关动作而使电脑传来的面板启动信号及图象信号同时输入液晶显示面板,这种情况有可能会立刻造成液晶显示面板的损坏。 But when the liquid crystal display panel is disposed in a monitor to form a liquid crystal monitor to a separate computer, since these signals need to input via an external input cable to the incoming liquid crystal monitor, a liquid crystal monitor itself and also owned power supply circuit may be activated separately, even if the timing of the input signal coming from the computer may be in line with the input timing requirements of the liquid crystal display panel, but may be because the input signal has a variety of conditions such as unforeseen accidents cable plug pulling operation or switching operation of the liquid crystal monitor panels coming from the computer and the enable signal input picture signal at the same liquid crystal display panel, this situation may cause immediate damage to the liquid crystal display panel.

此外,当液晶显示面板的显示频率变换时,例如像由DOS mode转换成为Window mode时,在转换的瞬间常会有瞬间的杂讯产生,这些杂讯常会造成液晶显示面板的显示干扰。 Further, when the liquid crystal display panel of a frequency transform, such as a DOS mode conversion becomes Window mode, momentary noise is generated often have at the moment of conversion, which often cause noise interference of the display liquid crystal display panel.

因此,本发明的主要目的在于提供一种液晶监视器,其包含有一保护电路用来保护液晶显示面板以解决上述的问题。 Therefore, a primary object of the present invention is to provide a liquid crystal monitor, which includes a protection circuit for protecting the liquid crystal display panel to solve the above problems.

本发明提供的一种液晶监视器,其包含:一接收电路,用来接收一电脑传来之一图象信号、一电源控制信号及一面板控制信号;一液晶显示面板,用来显示该图象信号,并依据一面板启动信号来控制其启动或关闭,该面板启动信号的输入时间需较该图象信号的输入时间延迟一预定时间段以避免该液晶显示面板因直流充电而遭致损害;一电源供应器,用来依据该电源控制信号来对该液晶显示面板提供电源并同时产生一电源启动信号;以及一保护电路,其包含一频率检测器电连接于该接收电路用来检测该图象信号的频率改变,以及一“与”门电路,其包含有一第一输入端电连接于该接收电路用来接收该面板控制信号以及一第二输入端电连接于该频率检测器,而其输出端则系电连接于该液晶显示面板用来产生该面板启动信号;其中当该频率检测器检测到 The present invention provides a liquid crystal monitor, comprising: a receiving circuit for receiving one of a video signal coming from the computer, a power control signal and a panel control signal; a liquid crystal display panel for displaying the FIG. the image signal, and based on a start signal to a control panel which is turned on or off time of the input panel for an enable signal delayed by a predetermined time period than the image signal input to avoid the liquid crystal display panel due to the DC charging compromised ; a power supply for the liquid crystal display according to the power control signal and simultaneously generating a panel of the power supply start signal; and a protection circuit which comprises a frequency detector electrically connected to the receiving circuit for detecting the changing the frequency of the image signal, and an "and" gate circuit, which comprises a first input terminal electrically connected to the receiving circuit for receiving the panel control signal and a second input terminal electrically connected to the frequency detector, and and an output terminal electrically connected to the system liquid crystal display panel of the panel for generating an activation signal; wherein when the detector detects the frequency 率改变时,该频率检测器会产生一时间长度大于该预定时间段的关闭信号以使该“与”门电路暂停产生该面板启动信号。 When the rate is changed, the frequency detector produces a length longer than the predetermined shutdown signal so that the period of time "and" pause gate circuit generating the start signal panel.

参考附图详细描述本发明实施例。 Detailed description of embodiments of the present invention with reference to the accompanying drawings.

附图简要说明:图1为本发明液晶监视器的示意图;图2为图1液晶监视器的功能方框图;图3为图2保护电路的电路图;图4为图3保护电路的时序图;图5为图3保护电路的另一时序图。 Brief Description: Figure 1 is a schematic view of the LCD monitor of the present invention; FIG. 2 is a functional block diagram view of a liquid crystal monitor; FIG. 3 is a circuit diagram of a protection circuit of FIG. 2; FIG. 4 is a timing diagram of a protection circuit in FIG. 3; FIG. 5 is a timing chart of FIG. 3 another protection circuit.

请参考图1及图2。 Please refer to FIG. 1 and FIG 2. 图1为本发明液晶监视器10的示意图。 Figure 1 is a schematic view of the liquid crystal monitor 10 of the present invention. 图2为图1液晶监视器10之功能方框图。 FIG 2 is a functional block diagram of an LCD 10 of the monitor. 液晶监视器10包含有一接收电路12、一液晶显示面板(LCD panel)14、一电源供应器16及一保护电路20。 The liquid crystal monitor 10 includes a receiving circuit 12, a liquid crystal display panel (LCD panel) 14, a power supply 16, and a protection circuit 20. 接收电路12是用来接收电脑30经由电缆线31传来的图象信号、电源控制信号及面板控制信号。 12 is a receiving circuit for receiving an image signal computer 30 via cable 31 coming from the power supply control signal and a panel control signal. 液晶显示面板14用来显示电脑30输入的图象信号,并依据保护电路20产生的面板启动信号来控制其启动或关闭。 The liquid crystal display panel 14 for displaying the input image signal the computer 30, and the panel according to the protection circuit 20 generates a start signal to control the turn on or off. 液晶显示面板14的面板启动信号的输入时间需较图象信号的输入时间延迟一保护时段TP以避免液晶显示面板14因直流充电而遭致损害。 The liquid crystal display panel, an activation signal input time of panel 14 than the required delay time of the input video signal in order to avoid a guard period TP liquid crystal display panel 14 due to the DC charging compromised. 电源供应器16是用来依据电脑30输入的电源控制信号来对液晶显示面板14提供电源并同时产生一电源启动信号,电源供应器16也可以用开关18来开启或关闭。 Power supply 16 is used to provide power panel 14 and simultaneously generates a power-up signal, the power supply 16 can also be used to turn on or off the switch 18 according to the power control signal input to the computer 30 to the liquid crystal display.

保护电路20是用来产生控制液晶显示面板14的面板启动信号。 The protection circuit 20 is used to generate a control activation signal liquid crystal display panel 14 of the panel. 保护电路20包含有一延迟电路22、一频率检测器24及一“与”门(AND GATE)电路26。 The protection circuit 20 comprises a delay circuit 22, a frequency detector 24 and an "and" gate (AND GATE) circuit 26. “与”门电路26包含有一第一输入端电连接于接收电路12用来接收面板控制信号,一第二输入端电连接于该延迟电路22用来接收被延迟的电源启动信号,以及一第三输入端电连接于频率检测器24的输出端,而其输出端则系电连接于液晶显示面板14用来产生面板启动信号。 "And" gate circuit 26 comprises a first input terminal electrically connected to the receiving circuit 12 for receiving the panel control signal, a second input terminal electrically connected to the delay circuit 22 for receiving the delayed power-on signal, and a second three input terminals electrically connected to the output of the frequency detector 24, and its output terminal is electrically connected to the line 14 to the liquid crystal display panel for generating an activation signal panel.

来自电脑30的面板控制信号是经由接收电路12而传入“与”门电路26,其主要是解决来自PC软件关机(reset)时所可能造成液晶显示面板14损伤的影响。 Panel from the computer 30 via a control signal receiving circuit 12 and the incoming "and" gate 26, which is mainly to solve the possible impact damage liquid crystal display panel 14 when the PC software from off (reset).

延迟电路22是用来将电源供应器16于端口32所产生的高电位的电源启动信号延迟一个大于保护时段TP的延迟时段TD,因此在开启电源供应器16时,延迟电路22的输出会使“与”门电路26于端口42所产生的高电位的面板启动信号至少延迟一个TD时段以保护液晶显示面板14。 The delay circuit 22 is used for the high-potential power-on signal 16 to the power supply port 32 is greater than the delay produced by a delay period of the guard period TP TD, so when the power supply 16 is turned on, the output of the delay circuit 22 will "and" high-potential gate circuit 26 to the port 42 of the panel enable signal generated at least one delay time TD to protect the liquid crystal display panel 14. 此外,延迟电路22于电源启动信号的电位例如5V降低至一预定电位例如4V时,会立刻产生一关闭信号来关闭液晶显示面板14。 Further, the delay circuit 22 to the power supply potential of 5V, for example, the start signal is lowered to a predetermined potential, for example 4V, it will produce an off signal to turn off once the liquid crystal display panel 14. 因此在关闭电源供应器16时,当延迟电路22检测到电源供应器16所产生的电源启动信号开始降低的时候,延迟电路22会立刻会于端口44产生一个低电位的关闭信号来关闭液晶显示面板14以保护液晶显示面板14。 Therefore, when off the power supply 16, when the power supply start signal delay circuit 22 detects the power supply 16 produced starts to decrease when the delay circuit 22 immediately generates an off signal of a low potential to a port 44 to turn off the liquid crystal display panel 14 to protect the liquid crystal display panel 14.

频率检测器24是用来检测由电脑30输入的图象信号的频率改变。 24 is a frequency detector for detecting a frequency change of the image signal input from the computer 30. 当频率检测器24检测到频率改变时,它会持续产生一个低电位的关闭信号以关闭液晶显示面板14。 When the frequency detector 24 detects a frequency change, it will continue to generate a signal close to a low potential close the LCD panel 14. 当频率检测器24检测到图象信号的频率稳定后,它会先产生一个大于保护时段TP的关闭信号来保护液晶显示面板14。 When the frequency detector 24 detects the frequency stability of the image signal, it will first produce a larger than the guard period signal TP is closed to protect the liquid crystal display panel 14. 关闭信号的时间长度为延迟时段TD,在延迟时段TD结束后,频率检测器24会再产生一个高电位的开启信号使液晶显示面板14开始显示。 The length of time for the delay period off signal TD, after the delay period TD, the frequency detector 24 will again turn generates a high potential signal of the liquid crystal display panel 14 starts to display. 频率检测器24在频率不稳定期间关闭液晶显示面板14的动作可避免在频率改变时,会有杂讯显示于液晶显示面板14上。 Frequency detector 24 to close the liquid crystal display panel 14 of the operation can be avoided when the frequency changes, noise will be displayed on the liquid crystal display panel 14 during the frequency instability. 此外,当频率检测器24测得图象信号不存在时,频率检测器24也会产生一个低电位的关闭信号将液晶显示面板14关闭以保护液晶显示面板14。 Further, the frequency detector 24 when the detected image signal is not present, the frequency detector 24 will produce a low level signal to close the liquid crystal display panel 14 is closed to protect the liquid crystal display panel 14.

请参考图3。 Please refer to FIG. 3. 图3为保护电路20的电路图。 3 is a circuit diagram of the protection circuit 20. 保护电路20的“与”门电路26在此一实施例中是由第一“与”门38以及第二“与”门40所构成,而面板启动信号则是由“与”门40的输出端口所产生。 "And" gate 26 in the protection circuit 20 in this embodiment is constituted by a first "and" gate 38 and a second "and" gate 40, and the panel by the output enable signal is "and" gate 40 port produced. 第一“与”门38之输入端口44系电连接于延迟电路22的输出端,而其另一输入端口34则系电连接于接收电路12用来接受来自电脑30的面板控制信号。 The first "and" input port 44 of system 38 is electrically connected to a gate output of the delay circuit 22, and the other input port 34 is electrically connected to the receiving circuit system 12 for receiving the panel control signal from the computer 30.

延迟电路22是一可产生固定时间延迟TD的RESET IC(H60522)所构成,而电源供应器16产生的高电位电源启动信号则是由端口32输入延迟电路22。 The delay circuit 22 may generate a fixed time delay of TD RESET IC (H60522) formed, and the high potential power supply power supply enable signal 16 is generated by the delay circuit 22 the input port 32. 在开启电源供应器16时,延迟电路22于端口46的输出会使“与”门电路26所产生的高电位面板启动信号至少延迟一个TD时段以保护液晶显示面板14。 When the power supply 16 is turned on, the delay circuit 22 to cause the output port 46 "and" high-level pulse start signal generated by the gate circuit 26 the delay period TD in order to protect at least one liquid crystal display panel 14. 此外,当端口32所输入之电源启动信号的电位降低至一预定电位例如像4V时,延迟电路22会立刻于端口46产生一低电位关闭信号来关闭液晶显示面板14。 Further, when the potential of the power supply of the start signal of the input port 32 is lowered to a predetermined potential as for example 4V, the delay circuit 22 immediately produces a low level signal to close the port 46 to close the liquid crystal display panel 14.

第一“与”门38的输出系电连接于第二“与”门40的输入端口46,而第二“与”门40的另一输入端口36则系电连接于频率检测器24的输出。 The first 'and' gate output line 38 is electrically connected to the second "and" gate 40 to the input port 46, and the other input of the second "and" gate 40, the output port 36 is electrically connected to the system frequency detector 24 . 频率检测器24主要是由一单稳态晶体管50(编号74LS123)及其周边电路所构成,而电脑30输入的图象信号中的水平输入信号系由输入端口48输入频率检测器24。 Frequency detector 24 is mainly constituted by 50 (number 74LS123) and a monostable peripheral circuit transistor and the level of the input video signal input 30 of the computer system of the input signal frequency detector 24 from the input port 48. 单稳态晶体管50内含有二组单稳态线路,第一组单稳态线路是用来检测输入信号的频率是否改变并于其频率改变时输出一个触发信号,而第二组单稳态线路则是在第一组单稳态线路输出触发信号后在频率检测器24的输出端口36产生一个延迟时段TD大于保护时段TP的低电位关闭信号以保护液晶显示面板14。 Transistors comprising monostable monostable circuit 50 the two groups, a first group of monostable circuit is used to detect the frequency of the input signal has changed and outputs a trigger signal when its frequency is changed, the second set of lines monostable after the trigger signal is in a first set of output monostable circuit generating a delay period TD low potential larger than the guard period TP in the frequency detector output signal port 3624 is closed to protect the liquid crystal display panel 14. 当图象信号的显示频率有变化时或是当使用者进行插拔液晶监视器10的电缆线31时,频率检测器24就会检测到这些变化并于端口36产生低电位关闭信号以保护液晶显示面板14。 When the display image signal frequency changes or when the user performs the LCD monitor cable 10 the plug 31, the frequency detector 24 will detect these changes and to generate a low potential signal port 36 is closed to protect the liquid crystal The display panel 14.

请参考图4。 Please refer to FIG 4. 图4为图3保护电路20的时序图,其显示图象信号的频率在时段TC时由频率F1改变成F2,当频率检测器24检测到频率改变时,它会于端口36产生一个时间长度为TC加上TD的低电位关闭信号以使“与”门电路26暂停产生面板启动信号以避免在频率改变时,会有杂讯显示于液晶显示面板14上。 FIG 4 is a timing diagram of the protection circuit 20 of FIG. 3, showing the frequency of an image signal TC of the frequency F1 is changed to F2 of the period, when the frequency detector 24 detects a frequency change, it will produce a length of time at port 36 TC is coupled with a low potential to cause TD off signal "and" gate generating circuit 26 to suspend the panel to prevent the enable signal when the frequency changes, there will be noise on the display panel 14 a liquid crystal display.

请参考图5。 Please refer to FIG. 5. 图5为图3保护电路20的另一时序图,其显示当电源供应器16被使用者用开关18关闭时,延迟电路22会在电源启动信号的电位降低至大约4V时,会立刻于端口44产生一低电位关闭信号以使“与”门电路26停止产生面板启动信号以保护液晶显示面板14。 5 is another timing diagram of the protection circuit 20 of FIG. 3, which shows that when the power supply 16 is turned off when the user switch 18, the delay circuit 22 will be reduced to approximately 4V of the potential of the power supply start signal, the port immediately 44 generates a low level signal to turn off so that the "and" gate circuit 26 stops generating the start signal to the protective panel liquid crystal display panel 14.

本发明液晶监视器10的保护电路20在一般的硬件瞬间关机、画面显示频率改变或电缆线插拔等状况下,都会适时的关闭液晶显示面板14以保护液晶显示面板14免于产生瞬间不正常显示画面或是因直流充电而遭致损害。 The protection circuit 10 of the present invention, the liquid crystal monitor 20 in a general hardware shutdown moment, the screen display frequency or cable plug changes and other conditions, are timely close the LCD panel 14 to protect the liquid crystal display panel 14 from generating abnormal instantaneous a display screen or compromised due to the DC charging.

以上所述仅为本发明的较佳实施例,凡依本发明权利要求所做的均等变化与修饰,皆应属本发明的涵盖范围。 The above are only preferred embodiments of the present invention, any modifications and alterations made under this invention as claimed in claim, also belong to the scope of the present invention.

Claims (4)

1.一种液晶监视器,其包含:一接收电路,用来接收一电脑传来之一图象信号、一电源控制信号及一面板控制信号;一液晶显示面板,用来显示该图象信号,并依据一面板启动信号来控制其启动或关闭,该面板启动信号的输入时间需较该图象信号的输入时间延迟一预定时间段以避免该液晶显示面板因直流充电而遭致损害;一电源供应器,用来依据该电源控制信号来对该液晶显示面板提供电源并同时产生一电源启动信号;以及一保护电路,其包含一频率检测器电连接于该接收电路用来检测该图象信号的频率改变,以及一“与”门电路,其包含有一第一输入端电连接于该接收电路用来接收该面板控制信号以及一第二输入端电连接于该频率检测器,而其输出端则系电连接于该液晶显示面板用来产生该面板启动信号;其中当该频率检测器检测到频率改变时 1. A liquid crystal monitor, comprising: a receiving circuit for receiving one of a video signal coming from the computer, a power control signal and a panel control signal; a liquid crystal display panel for displaying the image signal , and based on a start signal to control the panel turned on or off time of the input panel for an enable signal delayed by a predetermined time period than the image signal input to avoid the liquid crystal display panel due to the DC charging compromised; a power supply for the liquid crystal display according to the power control signal and simultaneously generating a panel of the power supply start signal; and a protection circuit which comprises a frequency detector electrically connected to the receiving circuit for detecting the image the frequency change signal, and an "and" gate circuit, which comprises a first input terminal electrically connected to the receiving circuit for receiving the panel control signal and a second input terminal electrically connected to the frequency detector, and an output end of the line electrically connected to the liquid crystal display panel of the panel for generating an activation signal; wherein when the frequency detector detects the frequency change 该频率检测器会产生一时间长度大于该预定时间段的关闭信号以使该“与”门电路暂停产生该面板启动信号。 The frequency detector generates a length of time greater than the predetermined shutdown signal so that the period of time "and" pause gate circuit generating the start signal panel.
2.如权利要求1所述的液晶监视器,其中,当该频率检测器测得该图象信号不存在时,该频率检测器亦会产生该关闭信号以使该“与”门电路停止产生该面板启动信号以保护该液晶显示面板。 The liquid crystal monitor according to claim 1, wherein, when the frequency detector detected the image signal is not present, the frequency detector will generate a signal to cause the closing of the "and" gate circuit stops generating the activation signal panel to protect the liquid crystal display panel.
3.如权利要求1所述的液晶监视器,其中,该保护电路另包含一延迟电路电连接于该电源供应器及该“与”门电路的一第三输入端之间,用来将该电源启动信号延迟至少该预定时间段以使该“与”门电路停止产生该面板启动信号至少该预定时间段以保护该液晶显示面板。 The liquid crystal monitor according to claim 1, wherein the protection circuit further comprises a delay circuit electrically connected to the power supply and between the "and" a third input of the gate circuit, for the delaying the power-on signal at least a predetermined period of time so that the "and" gate enable signal to stop generating the panel at least the predetermined period of time to protect the liquid crystal display panel.
4.如权利要求3所述的液晶监视器,其中,该延迟电路于该电源启动信号的电位低于一预定电位后,会立刻产生一关闭信号以使该“与”门电路停止产生该面板启动信号以保护该液晶显示面板。 4. The liquid crystal monitor according to claim 3, wherein the delay circuit to the power supply potential of the start signal is lower than a predetermined potential, an off signal is generated so that the "and" gate circuit immediately stops generating the panel activation signal to protect the liquid crystal display panel.
CN 98105489 1998-03-17 1998-03-17 Liquid crystal monitor designed with liquid crystal display panel protective circuit CN1115660C (en)

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