CN1886771A - Display apparatus and a method of controlling the same - Google Patents
Display apparatus and a method of controlling the same Download PDFInfo
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- CN1886771A CN1886771A CNA2004800354246A CN200480035424A CN1886771A CN 1886771 A CN1886771 A CN 1886771A CN A2004800354246 A CNA2004800354246 A CN A2004800354246A CN 200480035424 A CN200480035424 A CN 200480035424A CN 1886771 A CN1886771 A CN 1886771A
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- edid
- electric power
- edid storer
- display device
- storer
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G5/00—Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators
- G09G5/003—Details of a display terminal, the details relating to the control arrangement of the display terminal and to the interfaces thereto
- G09G5/005—Adapting incoming signals to the display format of the display terminal
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2360/00—Aspects of the architecture of display systems
- G09G2360/08—Power processing, i.e. workload management for processors involved in display operations, such as CPUs or GPUs
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G5/00—Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators
- G09G5/36—Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators characterised by the display of a graphic pattern, e.g. using an all-points-addressable [APA] memory
- G09G5/363—Graphics controllers
Abstract
A display apparatus include a connector, a readable/writable EDID storage to store EDID, and a controller to control the EDID storage to be write-protected from error data transmitted from a computer through the connector. With this configuration, the display apparatus and a method of controlling the same can prevent error data from being stored in an EDID storage.
Description
Technical field
The present invention relates to a kind of display device and the method for controlling it, more specifically, relate to a kind of display device and the method for controlling it, can avoid misdata to be stored in expanded scope recognition data (EDID) storer.
Background technology
In recent years, the display device with plug-and-play feature is extensively popularized.
Have plug-and-play feature display device can with computer exchange of information, and traditional display device is only from the computing machine received signal.When display device just in time inserted computing machine and opens, this display device with plug-and-play feature allowed computing machine automatically to optimize the user environment that is associated with display device, and allows the user directly to use this display device.
In order to provide plug-and-play feature to display device, display device must be stored expanded scope recognition data (EDID) in advance, for example manufacturer identification (ID), model name ID, display electrical management signaling capability are supportive etc., and must set in advance the agreement of the data communication between display device and the computing machine.
Therefore, created a kind of DDC (DDC) standard, defined a kind of standard with data communication at display device with plug-and-play feature by VESA (VESA).
The DDC standard sends to computing machine or passes through the agreement that keyboard, mouse etc. change video data as the video data that is used for being stored in display device, has defined the data communication channel between display device and the computing machine.
The DDC standard comprises various DDC grades, for example DDC1, DDC2B etc.
In DDC1, with video data with send accordingly, send to computing machine from display device by bit from the vertical synchronizing signal of computing machine.As long as vertical synchronizing signal is imported into display device, display device continues and the EDID that will have 128 byte data sizes circularly sends to computing machine.
In DDC2B, when computing machine was asked the EDID of display device by serial data line (SDA) and serial time clock line (SCL), display device sent to computing machine by SDA with EDID.
Fig. 1 is the EDID storer in the conventional display apparatus and the block scheme of peripherals.
As shown in Figure 1, in conventional display apparatus, by at least one EDID storer 110 that turns round in display electric power and the computing machine electric power.In addition, EDID storer 110 comprises write-protect (WP) port of ground connection.
Herein, when the WP port is in high state, only allow from EDID storer 110 reading of data.On the contrary, when the WP port is in the state of hanging down, allow to write data from EDID storer 110 reading of data with to it.
Yet conventional display apparatus allows to write data to EDID storer 110, as long as computing machine electric power is offered EDID storer 110, and tube display electric power is not how.Therefore, because Electrostatic Discharge or application and trouble when using a computer can write misdata EDID storer 110 undesirably.
In addition, under the situation of shutting down computer when reading EDID when visit EDID storer 110, data communication is interrupted, so EDID storer 110 can not be by SCL from computing machine receive clock signal, so EDID storer 110 becomes unusually.
In addition, when by display power operation EDID storer 110, opening under the situation of calculating, because computing machine electric power provides unsettled electric power can for EDID storer 110.In this case, if computer access EDID storer 110 can be carried out data communication in out of true ground.
Summary of the invention
In order to solve above-mentioned and/or other problems, the one side of the total notion of the present invention provides a kind of display device and controls its method, can avoid misdata to be stored in the EDID storer.
Another aspect of the total notion of the present invention provides a kind of display device and controls its method, can avoid the DC function to break down.
In the following description, partly provide additional aspect of the present invention and/or advantage, and these can be apparent from describe, and perhaps can acquire by practice of the present invention.
By a kind of display is provided, to realize above-mentioned and/or other aspects of the total notion of the present invention, this display comprises: connector; Readable/as can to write the EDID storer, be used to store EDID; And controller, be used to control the EDID storer, make it to be avoided by the misdata of connector transmission from computing machine by write-protect.
Total notion aspect according to the present invention; connector can optionally link to each other with the video card or the EDID storer anchor clamps of computing machine; be used to store EDID; and can determine to export definite signal according to what what thing linked to each other with connector; and according to definite signal; when controller is determined to have connected video card; controller can be controlled the EDID storer and make it by write-protect to avoid misdata; and when controller determines to have connected EDID storer anchor clamps, can control the EDID of EDID memory stores transmission from EDID storer anchor clamps.
Another aspect of total notion according to the present invention, EDID storer can comprise write-protect (WP) port, and controller can comprise microcomputer, are used for the definite signal according to connector, will enable signal or disable signal and send to the WP port.
Another aspect of total notion according to the present invention, according to definite signal, when controller was determined to have connected video card, controller can be controlled the communication condition of EDID storer with initialization EDID storer.
Another aspect of total notion according to the present invention, the EDID storer can comprise I
2The C line port, and controller can be determined I when connecting video card
2Whether the C circuit can visit, and works as I
2The C circuit be can visit the time, drive signal is sent to I
2The C line port is with the communication condition of initialization EDID storer.
Another aspect of total notion according to the present invention, drive signal can comprise the stop condition signal, to stop data transmission.
Another aspect of total notion according to the present invention; the EDID storer can comprise the power input end mouth; be used to receive display electric power or computing machine electric power; and when controller determined to provide computing machine electric power by the power input end mouth, controller can be controlled the EDID storer and make it by write-protect to avoid misdata.
Another aspect of total notion according to the present invention, the EDID storer can comprise the WP port, and controller can comprise current channel, so that the computing machine line of electric force links to each other with the WP port.
Another aspect of total notion according to the present invention, the EDID storer can comprise the WP port, and controller can comprise microcomputer, is used for will enabling signal or disable signal and sending to the WP port according to whether providing determining of computing machine electric power.
Another aspect of total notion according to the present invention, when controller determined to provide computing machine electric power, controller can be controlled the communication condition of EDID storer with initialization EDID storer.
Another aspect of total notion according to the present invention, the EDID storer can comprise I
2The C line port, and controller can be determined I when computing machine electric power is provided
2Whether the C circuit is addressable, and works as I
2When the C circuit is addressable, drive signal is sent to I
2The C line port is with the communication condition of initialization EDID storer.
Another aspect of total notion according to the present invention, drive signal can comprise the stop condition signal, is used to stop data transmission.
Another aspect of total notion according to the present invention, the EDID storer can comprise: the power input end mouth is used to receive display electric power or computing machine electric power; And the WP port, when providing computing machine electric power, enable, and when controller was determined to provide display electric power when computing machine electric power is provided, controller can be controlled the EDID storer and make it by write-protect to avoid misdata by the power input end mouth.
Another aspect of total notion according to the present invention, display device can also comprise switch, be used for enable and disable mode between switch the WP port, and controller can comprise microcomputer, be used for when controller determines to provide display electric power, gauge tap is enabled the WP port.
Another aspect of total notion according to the present invention, display device can also comprise selector switch, be used for selecting forbidding WP port, and controller can gauge tap be forbidden the WP port according to the selection of selector switch.
Another aspect of total notion according to the present invention, controller can comprise: microcomputer is used for exporting first control signal when beginning to provide display electric power when computing machine electric power just is provided; First switch is used for first control signal in response to microcomputer, exports second control signal; And second switch, be used for second control signal in response to first switch, enable and disable mode between switch the WP port.
By a kind of method of controlling display device is provided; wherein display device have connector and the storage EDID readable/can write the EDID storer; can realize the above of the total notion of the present invention and/or other aspects equally, this method comprises: control EDID storer makes it by write-protect to avoid by the misdata of connector transmission from computing machine.
Total notion aspect according to the present invention; the control of EDID storer can comprise: allow connector according to connector whether optionally link to each other with the video card of computing machine or EDID storer anchor clamps definite; signal is determined in output; be used to store EDID; and definite signal according to connector; when determining to have connected video card; control EDID storer makes it by write-protect to avoid misdata; and when determining to have connected EDID storer anchor clamps, control EDID memory stores sends the EDID from EDID storer anchor clamps.
Total notion aspect according to the present invention, this method also comprises: according to definite signal of connector, when determining to have connected video card, control EDID storer is with the communication condition of initialization EDID storer.
Another aspect of total notion according to the present invention, the control of EDID storer can comprise: when determining computing machine electric power is provided, control EDID storer makes it by write-protect to avoid misdata.
Another aspect of total notion according to the present invention, this method can also comprise: when determining computing machine electric power is provided, control EDID storer is with the communication condition of initialization EDID storer.
Another aspect of total notion according to the present invention; the control of EDID storer can comprise: when computing machine electric power being provided for the EDID storer; enable the WP port; and when determining display electric power is provided, control EDID storer makes it by write-protect to avoid sending the misdata from computing machine.
Another aspect of total notion according to the present invention, this method can also comprise: receives and selects signal with forbidding WP port, and according to selecting signal, control forbidding WP port.
Description of drawings
In conjunction with the accompanying drawings, from the description of following embodiment, these and/or other aspect and the advantage of the total notion of the present invention will become apparent, and be more readily understood, in the accompanying drawing:
Fig. 1 is the block scheme of EDID storer and peripherals in the conventional display apparatus;
Fig. 2 is the block scheme that the display device of total notion embodiment according to the present invention links to each other with video card;
Fig. 3 is the block scheme that display device shown in Figure 2 links to each other with EDID storer anchor clamps;
Fig. 4 is the block scheme of the display device of another embodiment of total notion according to the present invention;
Fig. 5 is the block scheme of the display device of another embodiment of total notion according to the present invention;
Fig. 6 is the block scheme of the display device of another embodiment of total notion according to the present invention;
Fig. 7 A and 7B show the waveform of signal level of the WP port of the port of the microcomputer in display device shown in Figure 6 and EDID storer;
Fig. 8 is the block scheme of the display device of another embodiment of total notion according to the present invention;
Fig. 9 shows the waveform of signal level of the WP port of the port of computing machine electric power in the display device shown in Figure 8, microcomputer and EDID storer;
Figure 10 shows SCL and the beginning of SDL signal and the example of stop condition in the display device of the embodiment of total notion according to the present invention;
Figure 11 and 12 shows another embodiment of total notion according to the present invention, the method for the display device shown in running Fig. 2 and 3;
Figure 13 is another embodiment of total notion according to the present invention, the method for the display device shown in the running Figure 4 and 5; And
Figure 14 is another embodiment of total notion according to the present invention, the method for the display device shown in running Fig. 6 and 8.
Embodiment
Detailed now embodiment with reference to the total notion of the present invention, example of the present invention shown in the drawings, in institute's drawings attached, similarly reference number is represented similar elements.Below by with reference to the accompanying drawings, embodiment is described, so that explain the embodiment of the total notion of the present invention.
Fig. 2 and 3 is block schemes of the display device of the embodiment of total notion according to the present invention.Shown in Fig. 2 and 3, display device can comprise: controller 11, and the video card 18 of computing machine or EDID storer anchor clamps 28 can optionally be attached thereto; EDID storer 10, storage EDID; And microcomputer 12, be used for according to determining that what thing links to each other with connector 11 control EDID storer 10.
Notice that alternatively, other external units can link to each other with display device.Connector 11 can be D-sub connector, digital visual interface (DVI) connector etc., and video card 18, EDID storer anchor clamps 28 etc. optionally is attached thereto by the one or more circuits that are coupling between display device and the external unit.
As shown in Figure 2, when video card 18 linked to each other with connector 11, because the part of the earth terminal of video card 18 and connector 11 links to each other, controller 11 can be exported ground voltage.In addition, as shown in Figure 3, when EDID storer anchor clamps 28 linked to each other with controller 11, owing to the resistance 26 that is arranged in the EDID storer anchor clamps 28, controller 11 can be exported predetermined voltage.That is, controller 11 produces one of ground voltage and predetermined voltage according to determining that what thing links to each other with connector 11, as definite signal, will determine that thereafter signal sends to microcomputer 12.
EDID storer 10 can comprise EEPROM (Electrically Erasable Programmable Read Only Memo) (EEPROM), is used for storing therein EDID.In aspect the present embodiment of the total notion of the present invention, the size of data of EDID is 128 bytes, as following＜table 1〉shown in.
＜table 1 〉
| Size (128 bytes altogether) | EDID |
| 8 bytes | Header |
| 10 bytes | Manufacturer/product differentiation code |
| 2 bytes | The EDID format version |
| 15 bytes | The basic display parameters/properties |
| 19 bytes | Expansion/standard time sequence |
| 72 bytes | Sequential ﹠ monitors standard |
| 1 byte | Extending marking |
| 1 byte | Verification and |
EDID storer 10 can comprise: the Vcc port is used to receive display electric power or computing machine electric power; Write-protect (WP) port; And serial time clock line (SCL) port and serial data line (SDA) port, as I
2The C port is to communicate with microcomputer 12 and video card 18.
Can by the Vcc port will be by diode 14 transmission display electric power and transmission offer EDID storer 10 from video card 18 and the computing machine electric power by diode 16.Herein, can be by at least one running EDID storer 10 in display electric power and the computing machine electric power.
In addition, when the WP port is in high state, only allow reading of data from EDID storer 10.On the contrary, when the WP port is in the state of hanging down, allow to write data from EDID storer 10 reading of data and to it.
The SCL of EDID storer 10 can link to each other with video card 18 by connector 11 with the SDL port, thereby forms I between EDID storer 10 and video card 18
2The C communication interface.In addition, SCL can link to each other with microcomputer 12 with the SDA port, thereby allows EDID storer 10 and microcomputer 12 to communicate.
Definite signal that microcomputer 12 can be produced according to connector 11 determines that video card 18 still is that EDID storer anchor clamps 28 link to each other with connector 11.
As shown in Figure 2, determining that microcomputer 12 can be with high signal as enabling the WP port that signal sends to EDID storer 10 under video card 18 and the situation that connector 11 links to each other.
On the other hand, as shown in Figure 3, determining that microcomputer 12 can send to low signal the WP port of EDID storer 10 under EDID storer anchor clamps 28 and the situation that connector 11 links to each other as disable signal.
Therefore, under video card 18 and situation that controller 11 links to each other, can enable the write-protect of EDID storer 10, thereby the transient error data of avoiding sending from computing machine are stored in the EDID storer 10.In addition, under EDID storer anchor clamps 28 and situation that connector 11 links to each other, the write-protect of forbidding EDID storer 10, thus allow normal EDID is stored in the EDID storer 10.Normal EDID is the SCL that sends to EDID storage 10 from the SCL and the SDA of EDID storer anchor clamps 28 by connector 11 and SDA port.
In addition, determining under video card 18 and the situation that connector 11 links to each other microcomputer 12 definite I
2Whether the C circuit is addressable.As definite result, work as I
2When the C circuit was addressable, microcomputer 12 sent to SCL and SDA port with the stop condition signal, so that the communication condition of initialization EDID storer 10.
Below, with reference to Figure 10, the stop condition signal is described.
Usually, the communication condition of SCL and SDA can be divided into busy condition, beginning condition, data transmission conditions and stop condition.
Under busy condition, SCL and SDA signal all are high.Under the beginning condition, the SCL signal becomes low state for height SDA signal from high state.Under stop condition, the SCL signal becomes high state for height SDA signal from low state.
That is, microcomputer 12 can will send to the SCL of EDID storer 10 and SDA port repeatedly with corresponding SCL of stop condition and SDA signal, thus the communication condition of initialization EDID storer 10.
Utilize this configuration,, describe operation according to the display device of the embodiment shown in Fig. 2 and 3 below with reference to Figure 11 and 12.
Figure 11 is the control flow chart of the operation carried out in display device shown in Figure 2 when video card 18 links to each other with connector 11, and Figure 12 is the control flow chart of the operation carried out in display device shown in Figure 3 when EDID storer anchor clamps 28 link to each other with connector 11.
As shown in figure 11, in operation S10, definite signal that microcomputer 12 can be produced according to connector 11 determines whether video card 18 links to each other with connector 11.When definite video card 18 linked to each other with connector 11, in operation S12, microcomputer 12 can will be enabled the WP port that signal sends to EDID storer 10, thereby avoids misdata to be written into EDID storer 10.In operation S14, the communication condition that microcomputer 12 can initialization EDID storer 10.
In addition, as shown in figure 12, in operation S20, definite signal that microcomputer 12 can be produced according to connector 11 determines whether EDID storer anchor clamps 28 link to each other with connector 11.When definite EDID storer anchor clamps 28 linked to each other with connector 11, in operation S22, microcomputer 12 can send to disable signal the WP port of EDID storer 10, thereby allowed the EDID that will send from EDID storer anchor clamps 28 to write EDID storer 10.
Fig. 4 is the block scheme of the display device of another embodiment of total notion according to the present invention.As shown in Figure 4, display device can comprise: EDID storer 30 has: the Vcc port, be used for receiving display electric power or computing machine electric power by diode 34 and 36 respectively, the WP port links to each other with computing machine line of electric force 38, SCL port and SDA port are used to form I
2The C communication interface; And current channel 32, be used for controlling EDID storer 30 according to whether providing determining of computing machine electric power.
Current channel 32 can make computing machine line of electric force 38 link to each other with the WP port, and when computing machine electric power being provided for EDID storer 30 by the Vcc port, can make the level of computing machine electric power be reduced to predetermined level by resistance 32b, thereby the signal that will have predetermined level send to the WP port.
This signal that has predetermined level and send to the WP port equals high signal when computing machine electric power is provided.
Therefore, when computing machine electric power being provided for when opening computing machine EDID storer 30, the transient error data of having avoided sending from computing machine are stored in the EDID storer 30.
Fig. 5 is the block scheme of the display device of another embodiment of total notion according to the present invention.As shown in Figure 5, display device can comprise EDID storer 40, has: the Vcc port, be used for receiving display electric power or computing machine electric power by diode 44 and 46 respectively, and WP port, and SCL port and SDA port are used to form I
2The C communication interface; And microcomputer 42, be used for controlling EDID storer 40 according to whether providing computing machine electric power.
Microcomputer 42 can pass through interrupt method or polling method, and determining whether provides computing machine electric power from the video card 48 that the Vcc port by EDID storer 40 links to each other with the connector (not shown).
As definite result, when determining that when video card 48 provided computing machine electric power for EDID storer 40, microcomputer 42 can send to the WP port with high signal, thereby the transient error data of avoiding sending from computing machine are stored in the EDID storer 40.
In addition, determining computing machine electric power to be offered under the situation of EDID storer 40 microcomputer 42 definite I
2Whether the C circuit is addressable.As definite result, work as I
2When the C circuit was addressable, microcomputer 42 can send to the stop condition signal SCL and SDA port, so that the communication condition of initialization EDID storer 40.
Utilize this configuration,, describe operation according to the display device of the embodiment shown in the Figure 4 and 5 below with reference to Figure 13.
At first, in operation S30, whether current channel 32 shown in Figure 4 and microcomputer 42 sensings shown in Figure 5 offer the Vcc port with computing machine electric power.When determining that computing machine electric power offered the Vcc port, in operation S32, will enable the WP port that signal sends to EDID storer 30 and 40, thereby avoid misdata to be written into EDID storer 30 and 40.In operation S34, can initialization EDID storer 30 and 40 communication condition, wherein, realize initialization by microcomputer shown in Figure 5 42.Whether in addition, in the embodiment shown in fig. 4, controller can be set, being used for sensing provides computing machine electric power, and is used for the communication condition of initialization EDID storer 30.
Fig. 6 is the block scheme of the display device of another embodiment of total notion according to the present invention.As shown in Figure 6, display device can comprise: EDID storer 50 has: the Vcc port, be used for receiving display electric power or computing machine electric power by diode 54 and 56 respectively, and the WP port, SCL port and SDA port are used to form I
2The C communication interface; Switch 64, enable and disable mode between switch the WP port; Selector switch 58 is selected forbidding WP port; And microcomputer 52, be used for the selection with selector switch 58 of providing, gauge tap 64 according to display electric power.
In this embodiment, when computing machine electric power was provided, the WP port that links to each other with the Vcc port became high level, and the transient error data of therefore having avoided sending from computing machine are stored in the EDID storer 50.
In addition, when determining by selector switch 58 selection forbidding WP ports, microcomputer 52 sends to switch 64 with high signal, so that open switch 64, thereby makes WP port ground connection.Therefore, can forbid the WP port as required.
By the hiding key combination of display device or the order of EDID storer anchor clamps (not shown) etc., realize selector switch 58 herein.Therefore, perhaps selector switch 58 can not easily be selected by the user, and selects in manufacturing process or after sale service.
In addition, suppose display electric power to be provided and computing machine electric power is provided for EDID storer 50 shown in Figure 6, the WP port of EDID storer 50 can be a high level, thereby avoids misdata to be written into EDID storer 50.
Yet, when when computing machine electric power just is provided, beginning to provide display electric power to EDID storer 50, the microcomputer 52 that can reset, and the output port of the microcomputer 52 that links to each other with switch 64 can become high level.
When the output port of microcomputer 52 becomes high level, open in Fig. 6 with the switch shown in the NPN transistor 62.Therefore therefore, the problem that allows time interval of writing appears producing in the WP port ground connection of EDID storer 50.
Fig. 7 A and 7B show the waveform of signal level of the WP port of the port of microcomputer shown in Figure 6 52 and EDID storer 50, and Fig. 7 A and 7B represent microcomputer 52 respectively recommend port and open drain (open-drain) port.
Shown in the waveform of the signal level (a) of Fig. 7 A and 7B, when beginning to provide display electric power to EDID storer 50 when computing machine electric power just is provided, the port of microcomputer 52 becomes high level immediately during time interval t1.Therefore, shown in the waveform of the signal level (b) of Fig. 7 A and 7B, the WP port becomes low level immediately during time interval t1, thereby EDID storer 50 can be write.Therefore, misdata may be write EDID storer 50.
Therefore, in the present embodiment of the total notion of the present invention, when display electric power being provided for EDID storer 50, microcomputer 52 can reset, and low signal can be sent to switch 64, thus off switch 64.Therefore, when when computing machine electric power just is provided, beginning to provide display electric power to EDID storer 50, the WP port can link to each other with the Vcc port, and can become high level, and the misdata that therefore can avoid sending from computing machine is written into EDID storer 50.
Fig. 8 is the block scheme of the display device of another embodiment of total notion according to the present invention.As shown in Figure 8, display device can comprise: microcomputer 72, when when just providing computing machine electric power, beginning to provide display electric power to display device, export first control signal by diode 74 by diode 76; First switch 88 in response to first control signal of microcomputer 72, switches to export second control signal; And second switch 84, in response to second control signal of first switch 88, enable and disable mode between switch the WP port.
When just providing computing machine electric power, providing display electric power to EDID storer 70 by the Vcc port, the port of the microcomputer 72 that links to each other with first switch 88 can become high level immediately, therefore open first switch 88, and ground signalling is sent to second switch 84.When second switch 84 received ground signalling and closes, the WP port can link to each other with the Vcc port, and can become high level.Therefore, but can avoid producing the write clock pulse that wherein can write EDID storer 70 time interval t1 shown in the waveform of the signal level (b) of Fig. 7 A and 7B.
Simultaneously, when microcomputer 72 determined that selector switch 78 is selected forbidding WP port, microcomputer 72 can send to low signal first switch 88, thereby closes first switch 88.Then, high signal is sent to second switch 84, thereby open second switch 84.Therefore, the WP port can ground connection, and can forbid (for example, in manufacturing process EDID being stored under the situation of EDID storer) as required.
Fig. 9 shows the waveform of signal level of the WP port of the port of computing machine electric power, microcomputer 72 of another embodiment of total notion according to the present invention and EDID storer 70.Although the computing machine electric power shown in the waveform of the signal level (a) as Fig. 9 is provided, the WP port can have the high level shown in the waveform of signal level (c), thereby protection EDID storer 70 is avoided being write.
When providing display electric power at the t3 place, the port of microcomputer 72 can become high level immediately.In the display device of the present embodiment of total notion according to the present invention, the WP port can remain high level, even the port of microcomputer 72 becomes high level immediately.Therefore, but can not produce write clock pulse.
Utilize this configuration,, describe the operation of the display device shown in Fig. 6 and 8 below with reference to Figure 14.Suppose and computing machine electric power is provided just for EDID storer 50 and 70.
At first, in operation S40, display electric power can be offered EDID storer 50 and 70, therefore, in operation S42, initialization microcomputer 52 and 72.Then, in operation S44, microcomputer 52 and 72 can be controlled and enable the WP port that signal is sent to EDID storer 50 and 70, thereby solves the problem of forbidding WP port when resetting microcomputer 52 and 72.
In the above-described embodiments, high signal is used as enables signal, and low signal is used as disable signal.Yet, be under the situation of low effective port at the WP of EDID storer port, low signal can be used as and enable signal, and high signal is used as disable signal.
Therefore, control EDID storer be stored in the EDID storer by the misdata that connector sends from computing machine avoiding, thereby protection EDID storer makes it not store abnormal data.
As mentioned above, the total notion of the present invention provides a kind of display device and controls its method, can avoid misdata to be stored in the EDID storer.
Although illustrated and described some embodiment of the total notion of the present invention, those skilled the in art will appreciate that, not breaking away under principle of the present invention and the spirit, can change in these embodiments, in claims and equivalent thereof, limit scope of the present invention.
Claims (34)
1. a display device is used for communicating with computing machine, comprising:
Connector;
Readable/as can to write the EDID storer, be used to store EDID; And
Controller is used to control the EDID storer, makes it to be avoided by the misdata of connector transmission from computing machine by write-protect.
2. display device according to claim 1; wherein; connector optionally links to each other with the video card or the EDID storer anchor clamps of computing machine; be used to store EDID; and can determine to export definite signal according to what what thing linked to each other with connector; and according to definite signal; when controller is determined to have connected video card; controller control EDID storer makes it by write-protect to avoid misdata; and when controller determined to have connected EDID storer anchor clamps, control EDID memory stores sent the EDID from EDID storer anchor clamps.
3. display device according to claim 2, wherein, the EDID storer comprises write-protect (WP) port, and controller comprises microcomputer, is used for the definite signal according to connector, will enable signal or disable signal and send to the WP port.
4. display device according to claim 3, wherein, according to definite signal, when controller was determined to have connected video card, controller control EDID storer was with the communication condition of initialization EDID storer.
5. display device according to claim 4, wherein, the EDID storer comprises I
2The C line port, and controller is determined I when connecting video card
2Whether the C circuit is addressable, and works as I
2When the C circuit is addressable, drive signal is sent to I
2The C line port is with the communication condition of initialization EDID storer.
6. display device according to claim 5, wherein, drive signal comprises the stop condition signal, to stop data transmission.
7. display device according to claim 1; wherein; the EDID storer comprises the power input end mouth; be used to receive display electric power or computing machine electric power; and when controller determined to provide computing machine electric power by the power input end mouth, controller control EDID storer made it by write-protect to avoid misdata.
8. display device according to claim 7, wherein, the EDID storer comprises the WP port, and controller comprises current channel, so that the computing machine line of electric force links to each other with the WP port.
9. display device according to claim 7, wherein, the EDID storer comprises the WP port, and controller comprises microcomputer, is used for will enabling signal or disable signal and sending to the WP port according to whether providing computing machine electric power.
10. display device according to claim 9, wherein, when controller determined to provide computing machine electric power, controller control EDID storer was with the communication condition of initialization EDID storer.
11. display device according to claim 10, wherein, the EDID storer comprises I
2The C line port, and controller is determined I when computing machine electric power is provided
2Whether the C circuit is addressable, and works as I
2When the C circuit is addressable, drive signal is sent to I
2The C line port is with the communication condition of initialization EDID storer.
12. display device according to claim 11, wherein, drive signal comprises the stop condition signal, is used to stop data transmission.
13. display device according to claim 1, wherein, the EDID storer comprises the power input end mouth, is used to receive display electric power or computing machine electric power; And the WP port, when providing computing machine electric power, enable, and when controller was determined to provide display electric power when computing machine electric power is provided, controller control EDID storer made it by write-protect to avoid misdata by the power input end mouth.
14. display device according to claim 13 also comprises:
Switch, be used for enable and disable mode between switch the WP port, wherein, controller comprises microcomputer, is used for when controller determines to provide display electric power, gauge tap is enabled the WP port.
15. display device according to claim 14 wherein, also comprises:
Selector switch is used for selecting forbidding WP port, and wherein, the controller gauge tap is forbidden the WP port according to the selection of selector switch.
16. display device according to claim 13, wherein, controller comprises: microcomputer is used for exporting first control signal when beginning to provide display electric power when computing machine electric power just is provided; First switch is used for first control signal in response to microcomputer, exports second control signal; And second switch, be used for second control signal in response to first switch, enable and disable mode between switch the WP port.
17. a method of controlling display device, wherein display device have connector and being used to store EDID readable/can write the EDID storer, described method comprises:
Control EDID storer makes it by write-protect to avoid by the misdata of connector transmission from computing machine.
18. method according to claim 17, wherein, the control of EDID storer comprises:
Allowing connector optionally is to link to each other with the video card of computing machine or link to each other with EDID storer anchor clamps according to connector, and signal is determined in output, with storage EDID; And
Definite signal according to connector; when determining to have connected video card; control EDID storer makes it by write-protect avoiding misdata, and when determine to have connected EDID storer anchor clamps, the transmission of control EDID memory stores is from the EDID of EDID storer anchor clamps.
19. method according to claim 18 also comprises:
According to definite signal of connector, when determining to have connected video card, control EDID storer is with the communication condition of initialization EDID storer.
20. method according to claim 17, wherein, the control of EDID storer comprises:
When determining computing machine electric power is provided, control EDID storer makes it by write-protect to avoid misdata.
21. method according to claim 20 also comprises:
When determining computing machine electric power is provided, control EDID storer is with the communication condition of initialization EDID storer.
22. method according to claim 17, wherein, the control of EDID storer comprises:
When computing machine electric power being provided for the EDID storer, enable the WP port; And
When determining display electric power is provided, control EDID storer makes it by write-protect to avoid sending the misdata from computing machine.
23. method according to claim 22 also comprises:
Receive and select signal with forbidding WP port; And
According to selecting signal, control WP port makes it disabled.
24. a display device is used for communicating with external unit, comprising:
The EDID storer according to the feature of external unit, avoids sending the storage from the misdata of external unit.
25. display device according to claim 24 also comprises:
Controller is determined the feature of external unit, and according to the determining of the feature of external unit, control EDID storer makes it by write-protect and non-storage errors data.
26. display device according to claim 24 also comprises:
Connector links to each other with external unit, is used to export the status signal of computing machine electric power signal and expression external unit feature, wherein, according in computing machine electric power signal and the status signal at least one, control EDID storer makes it by write-protect.
27. display device according to claim 24, wherein, external unit comprises one of video card and EDID storer anchor clamps.
28. display device according to claim 27, wherein, the EDID storer is from display device reception display electric power or from external unit receiving computer electric power, turn round by in display electric power and the computing machine electric power at least one, and when external unit is video card, avoid storing the transient error data of transmission from external unit.
29. display device according to claim 24, wherein, the EDID storer is from display device reception display electric power or from external unit receiving computer electric power, and when EDID storer receiving computer electric power when receiving display electric power, avoid storing the misdata of transmission from external unit.
30. the method for the display device that a control links to each other with external unit, this method comprises:
According to the feature of external unit, control EDID storer is not stored the misdata of transmission from external unit.
31. method according to claim 30, wherein, the control of EDID comprises:
Determine the feature of external unit; And
According to determining of external unit feature, control EDID storer makes it by write-protect, and storage errors data not.
32. method according to claim 30, wherein, the control of EDID comprises:
By the connector that links to each other with external unit, the status signal of output computing machine electric power signal and expression external unit feature; And
According in computing machine electric power signal and the status signal at least one, control EDID storer makes it by write-protect.
33. method according to claim 30, wherein, external unit comprises one of video card and EDID storer anchor clamps, and the control of EDID storer comprises:
From display device reception display electric power or from external unit receiving computer electric power;
According in display electric power and the computing machine electric power at least one, running EDID storer; And
When external unit is video card, avoid the transient error data of EDID memory stores transmission from external unit.
34. method according to claim 30, wherein, the control of EDID storer comprises:
From display device reception display electric power or from external unit receiving computer electric power; And
When EDID storer receiving computer electric power when receiving display electric power, avoid the misdata of EDID memory stores transmission from external unit.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020030086944A KR100791464B1 (en) | 2003-12-02 | 2003-12-02 | Display apparatus and method of controlling the same |
| KR1020030086944 | 2003-12-02 | ||
| KR1020040004728 | 2004-01-26 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1886771A true CN1886771A (en) | 2006-12-27 |
| CN100590687C CN100590687C (en) | 2010-02-17 |
Family
ID=37249013
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200480035424A Expired - Fee Related CN100590687C (en) | 2003-12-02 | 2004-08-10 | Display apparatus and a method of controlling the same |
Country Status (2)
| Country | Link |
|---|---|
| KR (1) | KR100791464B1 (en) |
| CN (1) | CN100590687C (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103810984A (en) * | 2012-11-09 | 2014-05-21 | 三星电子株式会社 | Display apparatus and method for controlling thereof |
| CN107871482A (en) * | 2017-10-26 | 2018-04-03 | 惠科股份有限公司 | Display device and its drive circuit and driving method |
| US10431173B2 (en) | 2017-10-26 | 2019-10-01 | HKC Corporation Limited | Display apparatus, and circuit and method for driving display apparatus |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100704666B1 (en) * | 2005-07-11 | 2007-04-09 | 삼성전자주식회사 | Display apparatus and control method thereof |
| KR102235715B1 (en) * | 2013-12-18 | 2021-04-01 | 엘지디스플레이 주식회사 | Liquid Crystal Display |
| KR102149752B1 (en) * | 2013-12-27 | 2020-08-31 | 엘지디스플레이 주식회사 | Circuit for Controlling a Memory and LCD having the Same |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11231994A (en) * | 1998-02-16 | 1999-08-27 | Toshiba Corp | Display device and controlling method for acquiring information related to display |
| JP2000194346A (en) * | 1998-12-28 | 2000-07-14 | Nec Home Electronics Ltd | Display device and computer system including the display device |
| JP3588604B2 (en) * | 2001-11-30 | 2004-11-17 | 株式会社東芝 | Electronic device and communication device switching method |
-
2003
- 2003-12-02 KR KR1020030086944A patent/KR100791464B1/en active IP Right Grant
-
2004
- 2004-08-10 CN CN200480035424A patent/CN100590687C/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103810984A (en) * | 2012-11-09 | 2014-05-21 | 三星电子株式会社 | Display apparatus and method for controlling thereof |
| CN107871482A (en) * | 2017-10-26 | 2018-04-03 | 惠科股份有限公司 | Display device and its drive circuit and driving method |
| CN107871482B (en) * | 2017-10-26 | 2019-04-05 | 惠科股份有限公司 | Display device and its driving circuit and driving method |
| WO2019080332A1 (en) * | 2017-10-26 | 2019-05-02 | 惠科股份有限公司 | Display device, driving circuit thereof and driving method therefor |
| US10431173B2 (en) | 2017-10-26 | 2019-10-01 | HKC Corporation Limited | Display apparatus, and circuit and method for driving display apparatus |
Also Published As
| Publication number | Publication date |
|---|---|
| KR20050053279A (en) | 2005-06-08 |
| CN100590687C (en) | 2010-02-17 |
| KR100791464B1 (en) | 2008-01-04 |
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