CN102768620A - Transmission method and transmission device for display data - Google Patents
Transmission method and transmission device for display data Download PDFInfo
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- CN102768620A CN102768620A CN2011103069876A CN201110306987A CN102768620A CN 102768620 A CN102768620 A CN 102768620A CN 2011103069876 A CN2011103069876 A CN 2011103069876A CN 201110306987 A CN201110306987 A CN 201110306987A CN 102768620 A CN102768620 A CN 102768620A
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- 238000004458 analytical method Methods 0.000 claims description 3
- 239000004973 liquid crystal related substance Substances 0.000 description 7
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Abstract
The invention discloses a transmission method for display data. The method comprises that a timer/counter control register (TCON) adjusts clock frequency of a crystal oscillator unit of the register, and the clock frequency is matched with a signal of the display data outputted by a display card of communication equipment; and when the signal of the display data is acquired, the TCON adopts a clock signal generated by the crystal oscillator unit to be used as a clock signal corresponding to the display data outputted by the display card. The invention also discloses a transmission device for the display data. By the method and the device, interference of the clock signal to a wireless signal can be reduced effectively, and integrity of receiving of the display data further can be guaranteed effectively.
Description
Technical Field
The present invention relates to signal transmission technologies, and in particular, to a method and an apparatus for transmitting display data.
Background
Currently, various portable communication devices such as mobile phones, notebooks, Global Positioning Systems (GPS) and the like perform data transmission through wireless signals, and the signal transmission mode between the display card and the liquid crystal display of these devices is generally a Low-voltage differential Signaling (LVDS) transmission mode, as shown in fig. 1, the LVDS transmission mode generally includes a clock signal line (CLK) and a display data signal line; wherein, show the data signal line and include: LV0, LV1 and LV2, the receiving end of the lcd collects the display signal on the data line by receiving the clock signal of the display card, and performs data analysis, so as to complete the transmission of the display data signal between the system end and the lcd, where the receiving end is a Timer/counter Control Register (TCON).
However, for the conventional LVDS transmission method, since the CLK is included, the transmitted clock signal belongs to a high frequency signal on the liquid crystal display, and the liquid crystal display needs to always transmit the high frequency signal when operating normally, which may affect the operation of the wireless module of the communication device, in other words, the transmitted clock signal may interfere with the reception of the wireless signal.
In addition, in the conventional LVDS transmission method, the clock signal may be attenuated or changed by external influence during the transmission process, so that the receiving end of the liquid crystal display performs data acquisition according to the wrong clock signal, thereby causing the loss of the display data.
Disclosure of Invention
In view of the above, the present invention provides a method and an apparatus for transmitting display data, which can effectively reduce the interference of a clock signal to a wireless signal.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
the invention provides a transmission method of display data, which comprises the following steps:
the TCON adjusts the clock frequency of a crystal oscillator unit of the TCON and matches with a signal of display data output by a display card of the communication equipment;
and when the display data signal is acquired, the TCON adopts a clock signal generated by a crystal oscillator unit as a clock signal corresponding to the display data output by the display card.
The invention also provides a transmission device for display data, which comprises: the system comprises a crystal oscillator unit and a collection unit; wherein,
the crystal oscillator unit is used for generating a clock signal;
the acquisition unit is used for adjusting the clock frequency of the crystal oscillator unit and is matched with a signal of display data output by a display card of the communication equipment; and when the display data signal is collected, the clock signal generated by the crystal oscillator unit is used as the clock signal corresponding to the display data output by the display card.
According to the transmission method and device of the display data, the TCON adjusts the clock frequency of the crystal oscillator unit of the TCON to be matched with the signal of the display data output by the display card of the communication equipment; when the display data signal is collected, the TCON adopts the clock signal generated by the adjusted crystal oscillator unit as the clock signal corresponding to the display data output by the display card, and when the display data is transmitted, the display card of the communication equipment does not need to transmit the clock signal corresponding to the display data to the TCON, so that the interference of the clock signal to the wireless signal can be effectively reduced; meanwhile, when the display data is transmitted, the corresponding clock signal is not transmitted, so that the receiving integrity of the display data can be effectively ensured.
In addition, in the acquisition process of the display data signals, the TCON adjusts the clock frequency of the crystal oscillator unit at regular time to be matched with the display data signals output by the display card, so that the receiving integrity of the display data can be further ensured.
Drawings
FIG. 1 is a diagram illustrating a conventional LVDS transmission scheme;
FIG. 2 is a schematic diagram of a method for transmitting display data according to the present invention;
FIG. 3 is a schematic diagram illustrating a clock signal transmission method during initialization of a communication device according to the present invention;
FIG. 4 is a schematic diagram of a transmission method of display data after the technical solution provided by the present invention is adopted;
fig. 5 is a schematic structural diagram of a display data transmission device according to the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
The transmission method of the display data of the invention, as shown in fig. 2, comprises the following steps:
step 201: the TCON adjusts the clock frequency of a crystal oscillator unit of the TCON and matches with a signal of display data output by a display card of the communication equipment;
as shown in fig. 3, specifically, when the communication device is initialized, the display card transmits a clock signal to the TCON through the display data signal line, and the TCON adjusts the clock frequency of the crystal oscillator unit according to the acquired clock signal, which is the same as the acquired clock signal; in fig. 3, LV0, LV1 and LV2 are all display data signal lines, and LV0 is adopted to transmit clock signals to TCON, while LV1 and LV2 are adopted to transmit blank signals;
the display data signal line is a pair of data lines, and in practical application, when display data is transmitted, the pair of data lines form a display data signal line, so that a pair of data lines is adopted to transmit clock signals; the specific processing process of the display card for transmitting the clock signal to the TCON through the display data signal line is completely the same as the specific processing process of the display data signal transmitted to the TCON through the display data signal line;
the method comprises the steps that when a video card transmits a clock signal to the TCON, a period of time is kept, and the time for starting up initialization of the communication equipment is generally 1-2 frames, so that the time for transmitting the clock signal is generally 1-2 frames, and the time can be set according to needs;
here, at present, a liquid crystal display generally has an Aging Test (Aging Test) mode, and the principle of the mode is as follows: when the LCD is powered on and has no external clock signal, the LCD displays the internally set picture, namely: white (White) - > Black (Black) - > Red (Red) - > Green (Green) - > Blue (Blue) and the like, at this time, because there is no external clock signal, the TCON uses the clock signal generated by the crystal oscillator unit as the external clock signal when performing data acquisition, so the clock signal generated by the crystal oscillator unit can be used as the clock signal corresponding to the signal for displaying data, and meanwhile, according to the system architecture of most communication devices at present, in the conventional LVDS transmission mode, the display card usually performs spread spectrum processing on the clock signal to reduce the interference generated by the clock signal, where the spread spectrum processing means: the frequency of the clock signal output by the display card takes the initial set value of the liquid crystal display as the center, and the frequency fluctuates up and down. Therefore, when the display card does not transmit the clock signal, the internal clock signal of the lcd is required to generate the spread spectrum signal, in other words, the clock frequency of the crystal oscillator unit is required to match the display data signal output by the display card, so as to ensure the correct acquisition of the display data.
Step 202: when the display data signals are collected, the TCON adopts the clock signals generated by the crystal oscillator unit as the clock signals corresponding to the display data output by the display card;
here, the display card still uses the display data line of the prior art to transmit display data to the TCON, and does not transmit clock signals to the TCON;
the method may further comprise:
in the acquisition process of the display data signals, the TCON adjusts the clock frequency of the crystal oscillator unit at regular time to be matched with the display data signals output by the display card;
specifically, when transmission of 1 frame of complete display data is finished and transmission of a Reset (Reset) signal is finished, the display card transmits a clock signal to the TCON through the display data signal line, and the TCON adjusts the clock frequency of the crystal oscillator unit to be the same as the frequency of the acquired clock signal according to the acquired clock signal;
here, since the current communication device, such as a notebook, may reduce the refresh frequency of the liquid crystal display, generally varying between 60Hz and 40Hz, when the current communication device is a same screen for a long time, in the conventional LVDS transmission mode, the display card may change the clock signal corresponding to the display data, so that, in order to match the frequency of the crystal oscillator unit with the signal of the display data output by the display card in real time, that is: keeping the frequency of the clock signal of the display card consistent in real time, detecting the frequency of the clock signal of the display card at regular time, and adjusting the clock frequency of the crystal oscillator unit in time; after the transmission of 1 frame of complete display data is finished, the display card transmits certain blank data to the TCON, then transmits a Reset signal to the TCON, and after the transmission of the Reset signal is finished and before the transmission of the display data of the next frame, a blank time exists, and the blank time can be used for transmitting a clock signal to the TCON; after the TCON knows the completion of the transmission of the Reset signal in advance, the transmitted signal is a clock signal;
the method may further comprise:
the TCON analyzes the acquired display data signals; the specific processing procedure for analyzing the collected display data signal is the prior art, and is not described herein again.
After the transmission method of the display data provided by the present invention is adopted, as shown in fig. 4, in the process of transmitting the display data, the display card is not required to generate a clock signal and transmit the clock signal to the TCON, and the TCON only needs to acquire the display data according to the clock signal generated by the crystal oscillator unit, wherein the dotted line part in fig. 4 represents that the clock signal line is removed, that is: and the independent clock signal transmission is removed, so that the interference of the clock signal to the wireless signal is effectively reduced, and the loss of display data is avoided.
In order to implement the method, the present invention further provides a transmission device for display data, as shown in fig. 5, the transmission device includes: a crystal oscillator unit 51 and a pickup unit 52; wherein,
a crystal oscillation unit 51 for generating a clock signal;
the acquisition unit 52 is used for adjusting the clock frequency of the crystal oscillator unit 51 and matching the clock frequency with a signal of display data output by a display card of the communication equipment; and when the display data signal is collected, the clock signal generated by the crystal oscillator unit 51 is used as the clock signal corresponding to the display data output by the display card.
Here, it should be noted that: the crystal oscillator unit 51 and the acquisition unit 52 are both logic units of TCON.
The acquisition unit 52 is further configured to adjust the clock frequency of the crystal oscillator unit 51 at regular time in the acquisition process of the display data signal, so as to match the clock frequency with the display data signal output by the display card.
The device may further include a graphics card 53, configured to transmit a clock signal to the acquisition unit 52 through a display data signal line when the communication device is initialized;
the acquisition unit 52 is specifically configured to: after receiving the clock signal transmitted by the graphics card 53, the clock frequency of the crystal oscillator unit 51 is adjusted according to the collected clock signal, and is the same as the collected clock signal.
The display card 53 is further configured to transmit a clock signal to the acquisition unit 52 through the display data signal line when transmission of the complete display data of 1 frame is finished and transmission of the Reset signal is finished.
The device may further include an analyzing unit, configured to analyze the acquired display data signal after receiving the display data signal including the clock signal and sent by the acquiring unit 52;
the acquiring unit 52 is further configured to send the acquired display data signal containing the clock signal to the analyzing unit.
Here, it should be noted that: the analysis unit is a logic unit of TCON.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention.
Claims (10)
1. A method for transmitting display data, the method comprising:
a timer/counter control register (TCON) adjusts the clock frequency of a crystal oscillator unit of the TCON to be matched with a signal of display data output by a display card of the communication equipment;
and when the display data signal is acquired, the TCON adopts a clock signal generated by a crystal oscillator unit as a clock signal corresponding to the display data output by the display card.
2. The method according to claim 1, wherein the TCON adjusts the clock frequency of its own crystal oscillator unit to match with the signal of the display data output by the graphics card of the communication device, and the method comprises:
when the communication equipment is started and initialized, the display card transmits a clock signal to the TCON through a display data signal line;
and the TCON adjusts the clock frequency of the crystal oscillator unit according to the acquired clock signal, and the clock frequency is the same as the frequency of the acquired clock signal.
3. A method according to claim 1 or 2, characterized in that the method further comprises:
in the acquisition process of the display data signals, the TCON adjusts the clock frequency of the crystal oscillator unit at regular time to be matched with the display data signals output by the display card.
4. The method according to claim 3, wherein the TCON timing adjusts the clock frequency of the crystal oscillator unit to match with the display data signal output by the display card, and comprises:
when the transmission of 1 frame of complete display data is finished and the transmission of a Reset (Reset) signal is finished, the display card transmits a clock signal to the TCON through the display data signal line;
and the TCON adjusts the clock frequency of the crystal oscillator unit to be the same as the frequency of the acquired clock signal according to the acquired clock signal.
5. A method according to claim 1 or 2, characterized in that the method further comprises:
the TCON analyzes the collected display data signals.
6. A transmission apparatus for display data, the apparatus comprising: the system comprises a crystal oscillator unit and a collection unit; wherein,
the crystal oscillator unit is used for generating a clock signal;
the acquisition unit is used for adjusting the clock frequency of the crystal oscillator unit and is matched with a signal of display data output by a display card of the communication equipment; and when the display data signal is collected, the clock signal generated by the crystal oscillator unit is used as the clock signal corresponding to the display data output by the display card.
7. The apparatus of claim 6,
the acquisition unit is also used for adjusting the clock frequency of the crystal oscillator unit at regular time in the acquisition process of the display data signals to be matched with the display data signals output by the display card.
8. The device of claim 6 or 7, further comprising a display card for transmitting a clock signal to the acquisition unit through the display data signal line when the communication device is initialized at power-on;
the acquisition unit is specifically configured to: and after receiving the clock signal transmitted by the display card, adjusting the clock frequency of the crystal oscillator unit according to the acquired clock signal, wherein the clock frequency is the same as the acquired clock signal.
9. The apparatus of claim 8,
and the display card is also used for transmitting a clock signal to the acquisition unit through the display data signal line when the transmission of the 1-frame complete display data is finished and the transmission of the Reset signal is finished.
10. The device of claim 6 or 7, further comprising an analysis unit, configured to analyze the acquired display data signal after receiving the display data signal including the clock signal sent by the acquisition unit;
the acquisition unit is also used for sending the acquired display data signals containing the clock signals to the analysis unit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110306987.6A CN102768620B (en) | 2011-10-11 | 2011-10-11 | Transmission method and transmission device for display data |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110306987.6A CN102768620B (en) | 2011-10-11 | 2011-10-11 | Transmission method and transmission device for display data |
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| Publication Number | Publication Date |
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| CN102768620A true CN102768620A (en) | 2012-11-07 |
| CN102768620B CN102768620B (en) | 2015-05-20 |
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| CN201110306987.6A Expired - Fee Related CN102768620B (en) | 2011-10-11 | 2011-10-11 | Transmission method and transmission device for display data |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103077694A (en) * | 2012-12-20 | 2013-05-01 | 广州视源电子科技股份有限公司 | System and method for removing spread spectrum of LVDS (Low Voltage differential Signaling) |
| CN109787716A (en) * | 2018-12-19 | 2019-05-21 | 惠科股份有限公司 | Data transmission method and device |
| CN110459188A (en) * | 2019-08-16 | 2019-11-15 | 四川长虹电器股份有限公司 | The processing method of LCD TV TCON timing control signal |
| CN114019268A (en) * | 2021-09-30 | 2022-02-08 | 惠科股份有限公司 | Aging test method, device, equipment and storage medium |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20040047440A1 (en) * | 2002-09-10 | 2004-03-11 | Broadcom Corporation | Phase lock loop with cycle drop and add circuitry |
| CN1801267A (en) * | 2004-11-06 | 2006-07-12 | 三星电子株式会社 | Apparatus and method for controlling display state |
-
2011
- 2011-10-11 CN CN201110306987.6A patent/CN102768620B/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20040047440A1 (en) * | 2002-09-10 | 2004-03-11 | Broadcom Corporation | Phase lock loop with cycle drop and add circuitry |
| CN1801267A (en) * | 2004-11-06 | 2006-07-12 | 三星电子株式会社 | Apparatus and method for controlling display state |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103077694A (en) * | 2012-12-20 | 2013-05-01 | 广州视源电子科技股份有限公司 | System and method for removing spread spectrum of LVDS (Low Voltage differential Signaling) |
| CN103077694B (en) * | 2012-12-20 | 2014-12-24 | 广州视源电子科技股份有限公司 | System and method for removing spread spectrum of LVDS (Low Voltage differential Signaling) |
| CN109787716A (en) * | 2018-12-19 | 2019-05-21 | 惠科股份有限公司 | Data transmission method and device |
| WO2020125408A1 (en) * | 2018-12-19 | 2020-06-25 | 惠科股份有限公司 | Data transmission method and apparatus |
| CN109787716B (en) * | 2018-12-19 | 2020-12-29 | 惠科股份有限公司 | Data transmission method and device |
| CN110459188A (en) * | 2019-08-16 | 2019-11-15 | 四川长虹电器股份有限公司 | The processing method of LCD TV TCON timing control signal |
| CN114019268A (en) * | 2021-09-30 | 2022-02-08 | 惠科股份有限公司 | Aging test method, device, equipment and storage medium |
| CN114019268B (en) * | 2021-09-30 | 2023-06-27 | 惠科股份有限公司 | Burn-in test method, device, equipment and storage medium |
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| CN102768620B (en) | 2015-05-20 |
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Granted publication date: 20150520 Termination date: 20201011 |