CN108172180B - Driving device of liquid crystal display and resetting method thereof - Google Patents
Driving device of liquid crystal display and resetting method thereof Download PDFInfo
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- CN108172180B CN108172180B CN201711371511.4A CN201711371511A CN108172180B CN 108172180 B CN108172180 B CN 108172180B CN 201711371511 A CN201711371511 A CN 201711371511A CN 108172180 B CN108172180 B CN 108172180B
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- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
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Abstract
The invention discloses a driving device of a liquid crystal display and a resetting method thereof, wherein the driving device of the liquid crystal display comprises: the system comprises a microprocessor, a time sequence controller, a switch circuit and a power supply management unit; the microprocessor is used for outputting a reset signal, outputting a power supply signal, transmitting an LVDS signal, sending a reset inquiry instruction and receiving a feedback signal corresponding to the reset inquiry instruction; the time sequence controller is used for receiving the LVDS signals, converting the LVDS signals, receiving the reset inquiry command and sending a feedback signal corresponding to the reset inquiry command; the microprocessor outputs a reset signal to reset the time schedule controller when working, and sends a reset inquiry instruction to the time schedule controller to judge whether the time schedule controller completes resetting, and the microprocessor resets the reset signal when the time schedule controller does not complete resetting. By the mode, the problem that the reset of the time schedule controller fails is effectively solved, and the problems of abnormal display and the like in the screen opening process are avoided.
Description
Technical Field
The invention relates to the technical field of display screens, in particular to a driving device of a liquid crystal display and a resetting method thereof.
Background
LCD (Liquid Crystal Display) can be divided into two industry groups that integrate Liquid Crystal modules and systems in an upstream-downstream relationship. A liquid crystal module factory integrates circuit components such as a flat panel and a TCON (time sequence controller), and the like, produces a liquid crystal module with specific interface specification and function, and provides the liquid crystal module for a manufacturer; the manufacturers use the components provided by each chip manufacturer, and connect with the liquid crystal module through interfaces such as LVDS (Low-Voltage Differential Signaling), so as to form complete liquid crystal products such as televisions, display screens, computers, and the like.
Due to the definition of the industrial structure, two technical subdivisions of TCON and LCD are created. At present, screen driving is mainly performed through a TCON in China, and the TCON has the function that LVDS image data input signals (input signals comprise RGB data signals, clock signals and control signals) sent by a digital board are converted into LVDS signals capable of driving a liquid crystal screen after being processed through a logic board, and then the LVDS signals are directly sent to an LVDS receiving chip of the liquid crystal screen.
Because the existing TCON has design defects, reset failure easily occurs in the reset operation process, the problem is difficult to be discovered in the design and manufacturing stage, and the manufacture cost and yield are influenced by changing the structure of the TCON.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a driving device of a liquid crystal display and a resetting method thereof, wherein the resetting operation of a time schedule controller is monitored by a microprocessor, so that the problem of resetting failure of the time schedule controller is effectively prevented.
To solve the above problems, the present invention provides a driving apparatus for a liquid crystal display, comprising:
the microprocessor is used for outputting a reset signal, outputting a power supply signal, transmitting an LVDS signal, sending a reset inquiry instruction and receiving a feedback signal corresponding to the reset inquiry instruction;
the input end and the output end of the time sequence controller are coupled, and are used for receiving and converting the LVDS signals;
the reset signal input end of the switch circuit is coupled with the reset signal output end of the microprocessor, and the power supply input end of the switch circuit is coupled with the power supply output end of the microprocessor;
the power supply output end of the power supply management unit is coupled with the power supply input end of the time sequence controller, and the power supply output end of the time sequence controller is grounded through a reset capacitor;
the microprocessor outputs a reset signal to reset the time schedule controller when working, and sends a reset inquiry instruction to the time schedule controller to judge whether the time schedule controller completes resetting, and the microprocessor resets the reset signal when the time schedule controller does not complete resetting.
And the input and output end of the time schedule controller is coupled with the input and output end of the microprocessor through an I2C bus, and is used for receiving the reset inquiry command and sending a feedback signal corresponding to the reset inquiry command.
Wherein the I2C bus includes a data line and a clock signal line.
Optionally, the switching circuit includes a first MOS switch, a first inductor, a second inductor, and a capacitor; the first MOS switch comprises a source, a gate and a drain, the source of the first MOS switch is coupled with the power output terminal of the microprocessor, the first end of the first inductor is coupled with the source of the first MOS switch, the second end of the first inductor is coupled with the first end of the second inductor, the second end of the second inductor is coupled with the gate of the first MOS switch, the first end of the capacitor is coupled with the source of the first MOS switch, and the second end of the capacitor is coupled with the gate of the first MOS switch; the drain electrode of the first MOS switch is the power output end of the switch circuit, and the second end of the first inductor is the reset signal input end of the switch circuit.
The driving device of the liquid crystal display further comprises a triode, the base electrode of the triode is coupled with the reset signal output end of the microprocessor, the collector electrode of the triode is coupled with the second end of the first inductor, and the emitting electrode of the triode is grounded.
Optionally, the driving apparatus of the liquid crystal display further includes a filter capacitor, a first end of the filter capacitor is coupled to the base of the triode, and a second end of the filter capacitor is grounded.
Optionally, the driving apparatus of the liquid crystal display further includes a third inductor, a first end of the third inductor is coupled to the power output terminal of the power management unit, and a second end of the third inductor is coupled to the power output terminal of the timing controller.
In order to solve the above problems, the present invention further provides a method for resetting a driving device of a liquid crystal display, comprising the steps of:
the microprocessor outputs a reset signal and a power supply signal to reset the time schedule controller;
the microprocessor sends a reset query instruction to the time sequence controller so that the time sequence controller returns a feedback signal corresponding to the reset query instruction according to the reset query instruction;
and if the microprocessor does not receive the feedback signal corresponding to the reset inquiry instruction within the preset time, the microprocessor resets the reset signal.
Wherein, if the microprocessor does not receive the feedback signal corresponding to the reset inquiry instruction within the preset time, the step of resetting the reset signal by the microprocessor specifically comprises:
if the microprocessor does not receive the feedback signal corresponding to the reset inquiry instruction within the preset time, the microprocessor resets the reset signal for multiple times until the feedback signal corresponding to the reset inquiry instruction is received.
Wherein, the reset signal is a high level signal.
The invention has the beneficial effects that: different from the prior art, the driving device of the liquid crystal display of the embodiment directly monitors the reset operation of the time schedule controller through the microprocessor, and the reset signal is reset forcibly under the condition that the reset of the time schedule controller fails, so that the problem of the reset failure of the time schedule controller is effectively prevented, the abnormal display in the screen opening process is avoided, and the working reliability of the time schedule controller is improved.
Drawings
FIG. 1 is a schematic diagram of a control circuit of a driving device of a liquid crystal display according to the present invention;
FIG. 2 is a flowchart illustrating a method for resetting a driving device of a liquid crystal display according to an embodiment of the present invention.
Detailed Description
Referring to fig. 1, fig. 1 is a schematic diagram of a control circuit structure of a driving device of a liquid crystal display according to the present invention, the driving device of the liquid crystal display includes a microprocessor 101, a timing controller 102, a power management unit 103, and a switch circuit 104. Wherein the content of the first and second substances,
a microprocessor (SOC, System on Chip) is an integrated circuit with specialized goals that encompass the complete System and the full contents of embedded software.
A Timing Controller (TCON) is a core of the entire driving apparatus, and the circuit logically converts the LVDS signal supplied from the front end to generate an RSDS (Relative Sequential Data Set) image Data signal, and various control signals required for a subsequent stage driving circuit. After the LVDS signals (including RGB primary color signals, line synchronization signals, field synchronization signals, and clock signals of the image) enter the timing controller, the RGB primary color signals are converted into RSDS image data signals.
In this embodiment, the microprocessor 101 is configured to output a reset signal, output a power signal, transmit an LVDS signal, send a reset query instruction, and receive a feedback signal corresponding to the reset query instruction. A signal input end of the timing controller 102 is coupled to a signal output end of the microprocessor 101 through the image transmission line 1011 for receiving and converting the LVDS signal, and an input and output end of the timing controller 102 is coupled to an input and output end of the microprocessor 101 for receiving the reset query instruction and sending a feedback signal corresponding to the reset query instruction. The reset signal input terminal of the switch circuit 104 is coupled to the reset signal output terminal of the microprocessor 101, the power supply input terminal of the switch circuit 104 is coupled to the power supply output terminal of the microprocessor 101, the power supply input terminal of the power supply management unit 103 is coupled to the power supply output terminal of the switch circuit 104, the power supply output terminal of the power supply management unit 103 is coupled to the power supply input terminal of the timing controller 102, and the power supply output terminal of the timing controller 102 is grounded through a reset capacitor C3.
In a specific embodiment, an input/output terminal of the timing controller 102 is coupled to an input/output terminal of the microprocessor 101 via an I2C bus, for receiving a reset query command and sending a feedback signal corresponding to the reset query command, wherein the I2C bus includes a data line 1012 and a clock signal line 1013. In other embodiments, the input/output terminal of the timing controller 102 and the input/output terminal of the microprocessor 101 may be in other communication manners as long as the interaction between the query command and the feedback signal is realized.
In a specific embodiment, the switching circuit 104 includes a first MOS switch Q1, a first inductor L1, a first inductor L2, and a capacitor C1. The first MOS switch Q1 includes a source, a gate, and a drain. A source of the first MOS switch Q1 is coupled to a power output of the microprocessor 101, a first terminal of a first inductor L1 is coupled to a source of the first MOS switch Q1, a second terminal of the first inductor L1 is coupled to a first terminal of a second inductor L2, a second terminal of the second inductor L2 is coupled to a gate of the first MOS switch Q1, a first terminal of a capacitor C1 is coupled to a source of the first MOS switch Q1, and a second terminal of a capacitor C1 is coupled to a gate of the first MOS switch Q1; the drain of the first MOS switch Q1 is the power output terminal of the switch circuit 104, and the second terminal of the first inductor L1 is the reset signal input terminal of the switch circuit 104. The first MOS switch Q1 is a PMOS transistor, and turns on the circuit when a high level signal is input.
In a specific embodiment, the driving apparatus of the liquid crystal display of the present invention further includes a transistor Q2. The base of the transistor Q2 is coupled to the reset signal output of the microprocessor 101, the collector of the transistor Q2 is coupled to the second terminal of the L1 of the first inductor, and the emitter of the transistor Q2 is grounded.
Further, to reduce the current variation of the power input terminal of the timing controller, the driving apparatus of the liquid crystal display according to the present invention further includes a third inductor L3, wherein a first terminal of the third inductor L3 is coupled to the power output terminal of the power management unit 101, and a second terminal of the third inductor L3 is coupled to the power output terminal of the timing controller 102.
In addition, in order to reduce ac ripple and improve high-efficiency smooth dc output, the driving apparatus of the lcd of the present invention further includes a filter capacitor C2, the filter capacitor C2 is located between the microprocessor 101 and the transistor Q2 circuit, a first end of the filter capacitor C2 is coupled to the base of the transistor Q2, and a second end of the filter capacitor C2 is grounded.
In a specific embodiment, when the microprocessor 101 is powered on (220V), the reset signal output terminal of the microprocessor 101 outputs a high-level reset signal, the power output terminal of the microprocessor 101 outputs a voltage (e.g., 12V) to the first MOS switch Q1, the transistor Q2 is turned on, the first MOS switch Q1 is turned on, that is, the microprocessor 101 provides a voltage to the power management unit 103, the power management unit 103 obtains a loading voltage (e.g., 12V), and the power management unit 103 converts the voltage input by the microprocessor 101 to output a suitable voltage to the timing controller 102, for example, converts the 12V voltage to a 3.3V voltage, so that the timing controller 102 obtains a voltage required by normal operation. An input/output end of the microprocessor 101 sends a reset query instruction to an input/output end of the timing controller 102, the timing controller 102 detects whether the resetting is successful after receiving the reset query instruction, if the resetting is successful, a feedback signal corresponding to the reset query instruction is sent to the microprocessor 101 through the input/output end, the resetting is successful, and if the resetting is failed, the timing controller 102 does not send the feedback signal to the microprocessor 101. After the microprocessor 101 receives the feedback signal, the output signal of the reset signal output end is unchanged, namely, the original high level is kept; when the microprocessor 101 does not receive the feedback signal, the reset signal output end changes the original high level into the low level and then into the high level, so that the switch circuit 104 is turned off and then turned on. Specifically, when the output signal of the reset signal output terminal changes from a high level to a low level, the transistor is turned off, the first MOS switch is turned off, and then when the output signal of the reset signal output terminal changes from a low level to a high level, the transistor is turned on, the first MOS switch is turned on, the power management unit 103 supplies power to the timing controller 102 again, and the timing controller 102 performs a reset operation.
Different from the prior art, the driving device of the liquid crystal display of the embodiment directly monitors the reset operation of the time schedule controller through the microprocessor, and the reset signal is reset forcibly under the condition that the reset of the time schedule controller fails, so that the problem of the reset failure of the time schedule controller is effectively prevented, the abnormal display in the screen opening process is avoided, and the working reliability of the time schedule controller is improved.
Referring to fig. 2, fig. 2 is a schematic flow chart of an embodiment of a method for resetting a driving device of a liquid crystal display according to the present invention, including the following steps:
201: the microprocessor outputs a reset signal and a power signal to reset the time schedule controller.
The method for resetting the timing controller is described in detail below with reference to the driving apparatus of the liquid crystal display of fig. 1. The reset signal output end of the microprocessor 101 outputs a high-level reset signal, the power output end of the microprocessor 101 outputs a voltage to the first MOS switch Q1, the transistor Q2 is turned on, and the first MOS switch Q1 is turned on, that is, the microprocessor 101 provides a voltage to the power management unit 103, the power management unit 103 obtains a loading voltage, the voltage input by the microprocessor 101 of the power management unit 103 is converted to output a proper voltage to the timing controller 102, so that the timing controller 102 obtains a voltage required by normal operation. The MOS switch is a P-type metal oxide semiconductor switch.
In other embodiments, the first MOS switch Q1 may also be an NMOS switch, and the on or off state of the MOS switch is controlled by controlling the input reset signal voltage, which is not limited herein.
202: and the microprocessor sends a reset query instruction to the time sequence controller so that the time sequence controller returns a feedback signal corresponding to the reset query instruction according to the reset query instruction.
In this embodiment, the microprocessor sends a reset query command to the timing controller via the I2C bus.
In the prior art, the microprocessor and the time schedule controller work in a unidirectional mode, and after the microprocessor conducts a circuit of the time schedule controller, whether the time schedule controller completes resetting cannot be confirmed. In the invention, if the reset is successful, the time schedule controller sends a feedback signal corresponding to the reset inquiry instruction to the microprocessor, and the microprocessor keeps the current running state according to the feedback signal corresponding to the reset inquiry instruction; if the reset fails, the time schedule controller can not send a feedback signal corresponding to the reset inquiry instruction to the microprocessor. In this embodiment, in the resetting process, one or more of power-on automatic reset, key level reset and external pulse may be selected according to the structure of the timing controller.
203: and if the microprocessor does not receive the feedback signal corresponding to the reset inquiry instruction within the preset time, resetting the reset signal by the microprocessor.
Under normal conditions, after the microprocessor sends a reset query instruction to the time sequence controller, the time sequence controller should send a feedback signal corresponding to the reset query instruction to the microprocessor. However, if the probabilistic reset of the timing controller is unsuccessful, it indicates that the microprocessor cannot receive the feedback signal corresponding to the reset inquiry command within a predetermined time, and in this case, the microprocessor controls the reset signal to be lowered and then raised, so as to force the timing controller to reset. In the above embodiment, the number of times of resetting the microprocessor may be one or more times until the microprocessor receives the feedback signal corresponding to the reset inquiry command from the timing controller. For a specific process, reference may be made to the description of the above embodiments, which is not repeated herein.
Different from the prior art, the method for resetting the driving device of the liquid crystal display directly monitors the resetting operation of the time schedule controller through the microprocessor, and resets the reset signal to perform forced resetting under the condition that the resetting of the time schedule controller fails, so that the problem of the resetting failure of the time schedule controller is effectively prevented, the abnormal display in the screen opening process is avoided, and the working reliability of the time schedule controller is improved.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes performed by the present specification and drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (10)
1. A driving apparatus of a liquid crystal display, comprising:
the microprocessor is used for outputting a reset signal, outputting a power supply signal, transmitting an LVDS signal, sending a reset inquiry instruction and receiving a feedback signal corresponding to the reset inquiry instruction;
the input end and the output end of the time sequence controller are coupled, and are used for receiving and converting the LVDS signals;
the reset signal input end of the switch circuit is coupled with the reset signal output end of the microprocessor, and the power supply input end of the switch circuit is coupled with the power supply output end of the microprocessor;
the power supply output end of the power supply management unit is coupled with the power supply input end of the time sequence controller, and the power supply output end of the time sequence controller is grounded through a reset capacitor;
the microprocessor outputs a reset signal to reset the time schedule controller when working, and sends a reset inquiry instruction to the time schedule controller to judge whether the time schedule controller completes resetting, and the microprocessor resets the reset signal when the time schedule controller does not complete resetting.
2. The apparatus of claim 1, wherein the input/output terminal of the timing controller is coupled to the input/output terminal of the microprocessor through an I2C bus, and is configured to receive the reset query command and send a feedback signal corresponding to the reset query command.
3. The driving apparatus of the liquid crystal display according to claim 2, wherein the I2C bus line includes a data line and a clock signal line.
4. The driving apparatus of the liquid crystal display according to claim 1, wherein the switching circuit includes a first MOS switch, a first inductor, a second inductor, and a capacitance; the first MOS switch comprises a source, a gate and a drain, the source of the first MOS switch is coupled with the power output terminal of the microprocessor, the first end of the first inductor is coupled with the source of the first MOS switch, the second end of the first inductor is coupled with the first end of the second inductor, the second end of the second inductor is coupled with the gate of the first MOS switch, the first end of the capacitor is coupled with the source of the first MOS switch, and the second end of the capacitor is coupled with the gate of the first MOS switch; the drain electrode of the first MOS switch is the power output end of the switch circuit, and the second end of the first inductor is the reset signal input end of the switch circuit.
5. The apparatus of claim 4, further comprising a transistor, wherein a base of the transistor is coupled to the reset signal output terminal of the microprocessor, a collector of the transistor is coupled to the second terminal of the first inductor, and an emitter of the transistor is grounded.
6. The driving apparatus of the liquid crystal display according to claim 5, further comprising a filter capacitor, wherein a first terminal of the filter capacitor is coupled to the base of the transistor, and a second terminal of the filter capacitor is grounded.
7. The driving apparatus of the liquid crystal display according to claim 1, further comprising a third inductor, wherein a first end of the third inductor is coupled to the power output terminal of the power management unit, and a second end of the third inductor is coupled to the power output terminal of the timing controller.
8. A method for resetting a driving device of a liquid crystal display is characterized by comprising the following steps:
the microprocessor outputs a reset signal and a power supply signal to reset the time schedule controller;
the microprocessor sends a reset query instruction to the time sequence controller so that the time sequence controller returns a feedback signal corresponding to the reset query instruction according to the reset query instruction;
and if the microprocessor does not receive the feedback signal corresponding to the reset inquiry instruction within the preset time, the microprocessor resets the reset signal.
9. The method according to claim 8, wherein if the microprocessor does not receive the feedback signal corresponding to the reset inquiry command within a predetermined time, the step of resetting the reset signal by the microprocessor specifically comprises:
if the microprocessor does not receive the feedback signal corresponding to the reset inquiry instruction within the preset time, the microprocessor resets the reset signal for multiple times until the feedback signal corresponding to the reset inquiry instruction is received.
10. The method of claim 8, wherein the reset signal is a high signal.
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| CN201711371511.4A CN108172180B (en) | 2017-12-18 | 2017-12-18 | Driving device of liquid crystal display and resetting method thereof |
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| CN110675794B (en) * | 2019-09-12 | 2021-07-06 | Tcl华星光电技术有限公司 | Power management chip and driving method and driving system thereof |
| CN111341244B (en) * | 2020-04-14 | 2023-01-24 | Tcl华星光电技术有限公司 | Resetting method and device of time sequence control chip and display panel |
| CN112951134B (en) * | 2021-04-20 | 2022-09-20 | 合肥京东方显示技术有限公司 | Clock recovery device, source electrode driving circuit, display panel and equipment |
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| KR100535357B1 (en) * | 1999-12-29 | 2005-12-09 | 비오이 하이디스 테크놀로지 주식회사 | Timing controller |
| KR101281667B1 (en) * | 2006-05-11 | 2013-07-03 | 엘지디스플레이 주식회사 | Soft fail processing circuit and method for liquid crystal display device |
| KR101326075B1 (en) * | 2007-01-12 | 2013-11-07 | 삼성디스플레이 주식회사 | Liquid crystal display divice and driving method thereof |
| CN101598858B (en) * | 2008-06-06 | 2010-12-22 | 群康科技(深圳)有限公司 | Liquid crystal display high-voltage test circuit and liquid crystal display high-voltage test method |
| CN102629459A (en) * | 2011-10-26 | 2012-08-08 | 北京京东方光电科技有限公司 | Gate line driving method, shift register and gate line driving device |
| TWI549113B (en) * | 2015-05-29 | 2016-09-11 | 鴻海精密工業股份有限公司 | Display device |
| CN106548761B (en) * | 2017-01-17 | 2019-01-18 | 京东方科技集团股份有限公司 | A kind of display control circuit of display panel, display control method and relevant apparatus |
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Address after: No.9-2 Tangming Avenue, Guangming New District, Shenzhen City, Guangdong Province Patentee after: TCL Huaxing Photoelectric Technology Co.,Ltd. Address before: No.9-2 Tangming Avenue, Guangming New District, Shenzhen City, Guangdong Province Patentee before: Shenzhen China Star Optoelectronics Technology Co.,Ltd. |