CN110728961A - Delay control circuit and control method on liquid crystal display - Google Patents
Delay control circuit and control method on liquid crystal display Download PDFInfo
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- CN110728961A CN110728961A CN201911006586.1A CN201911006586A CN110728961A CN 110728961 A CN110728961 A CN 110728961A CN 201911006586 A CN201911006586 A CN 201911006586A CN 110728961 A CN110728961 A CN 110728961A
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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
- 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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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/02—Improving the quality of display appearance
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Abstract
The invention provides a power-on delay control circuit of a liquid crystal display, which comprises a control circuit, a power supply circuit, a switching circuit, a gamma voltage output circuit and a VCOM voltage output amplifying circuit, wherein the output ends of the control circuit and the power supply circuit are connected with the switching circuit, the gamma voltage output circuit and the VCOM voltage output amplifying circuit are sequentially connected, the gamma voltage output circuit outputs gamma voltage to the liquid crystal display, and the VCOM voltage output amplifying circuit outputs VCOM amplifying voltage to the liquid crystal display. The invention adopts the control circuit and the switch circuit to realize the time delay of the gamma voltage and the VCOM amplifying voltage, and eliminates the abnormal phenomena of screen flashing and white lines when the liquid crystal display is electrified.
Description
Technical Field
The invention belongs to the technical field of liquid crystal display, and particularly relates to a delay control circuit and a delay control method for a liquid crystal display.
Background
When the liquid crystal display displays, a voltage (gamma voltage) is applied to the pixel electrode, a voltage (VCOM voltage) is applied to the common electrode, and a voltage difference is formed to control the deflection angle of the liquid crystal molecules so as to display different brightness. However, when the lcd is powered on, the gamma voltage and the VCOM voltage are directly generated, and at this time, the timing control chip (TCON chip) does not yet send out the control signal, and the gamma voltage and the VCOM voltage are in a non-control state, and a voltage difference is generated between the pixel electrode and the common electrode, thereby causing abnormal phenomena such as screen flashing, white lines, and the like.
As shown in fig. 1, a general liquid crystal display substrate includes a gate line G1, a data line S1, a pixel electrode D1 disposed in a region defined by the gate line G1 and the data line S1, and TFTs 1 corresponding to the pixel electrodes D1 one to one. The TFT1 has a gate electrode coupled to the gate line G1, a source electrode coupled to the data line S1, and a drain electrode coupled to the pixel electrode D1. When the liquid crystal display displays, a grid scanning signal is sequentially input to each row of grid lines G1, each row of TFT is controlled to be conducted, and a data signal is applied to each column of data signal lines; the gate scan signal may specifically include: a gate-on signal for controlling the TFT to be turned on and a gate-off signal for controlling the TFT to be turned off. When the TFT is turned on, the data line S1 is also applied with an OP amplified pixel voltage obtained by amplifying the data signal and the gamma voltage by an OP, and the pixel voltage is written into the pixel electrode. At this time, the common electrode on the color film substrate in the liquid crystal display panel is also loaded with the VCOM common voltage, so that an electric field is formed by the common voltage and the pixel voltage of the pixel electrode, liquid crystal molecules in the liquid crystal display panel are controlled to deflect, and an image display function is realized.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a delay control circuit on a liquid crystal display, which adopts a control circuit and a switch circuit to realize the delay of gamma voltage and VCOM amplified voltage and eliminate the abnormal phenomena of screen flashing and white lines when the liquid crystal display is powered on.
The technical solution for realizing the purpose of the invention is as follows:
a power-on delay control circuit of a liquid crystal display comprises a control circuit, a power supply circuit, a switch circuit, a gamma voltage output circuit and a VCOM voltage output amplifying circuit, wherein the output ends of the control circuit and the power supply circuit are connected with the switch circuit, the gamma voltage output circuit and the VCOM voltage output amplifying circuit are sequentially connected, the control circuit is used for receiving a power-on signal of a main control chip MCU of a T-Con board, generating VCC, a resistor and a capacitor through a power supply module, setting delay time and outputting a control signal; the power supply circuit is used for performing voltage stabilization filtering on the voltage provided by the T-Con board; the switching circuit is used for controlling the on-off of the gamma voltage output circuit according to the control signal; the gamma voltage output circuit outputs gamma voltages to the liquid crystal display, and the VCOM voltage output amplifying circuit outputs VCOM amplified voltages to the liquid crystal display; wherein: the control circuit comprises a power module U1, a resistor R1, a capacitor C1 and an NMOS tube Q1, one end of the power module U1 is connected with the MCU and used for receiving an electrifying signal of the MCU and outputting a power VCC, the product of the resistance value of the resistor R1 and the capacitance value of the capacitor C1 meets the time required by the MCU from electrifying to normally outputting data, one end of the resistor R1 is connected with a power output port of the power module U1, the other end of the resistor R1 is connected with one end of the capacitor C1 and the G pole of the NMOS tube Q1 in a common way, the other end of the capacitor C1 is grounded, the S pole of the NMOS tube Q1 is grounded, the D pole of the NMOS tube Q1 is used as the output end of the control circuit and connected with the switch circuit, and the D pole of the NMOS; the switch circuit comprises a resistor R3 and a PMOS tube Q3, one end of the resistor R3 is connected with the S pole of the PMOS tube Q3 and the output end of the power supply circuit in a common way, the other end of the resistor R3 is connected with the G pole of the PMOS tube Q3 and the output end of the control circuit in a common way, and the D pole of the PMOS tube Q3 serving as the output end of the switch circuit is connected with the gamma voltage output circuit.
Furthermore, the power supply circuit of the delay control circuit on the liquid crystal display comprises a resistor C2, one end of a capacitor C2 is connected with an AVDD power output port of the T-Con board and is used as an output end of the power supply circuit to be connected with the switch circuit, and the other end of the resistor C2 is grounded.
Furthermore, in the delay control circuit on the lcd of the present invention, the Gamma voltage output circuit is implemented by a pga IC U4 chip, the input terminal of the P Gamma IC U4 is connected to the output terminal of the switch circuit, the output terminal is connected to both the lcd and the VCOM voltage output amplifier circuit, and the P Gamma IC U4 outputs 14 paths of Gamma voltages to the lcd and outputs a reference voltage to the VCOM voltage output amplifier circuit.
Furthermore, in the delay control circuit for liquid crystal display according to the present invention, the VCOM voltage output amplifying circuit includes an operational amplifier U5 and a capacitor C5, an input anode of the operational amplifier U5 is connected to the output terminal of the gamma voltage output circuit and receives a reference voltage, an input cathode of the operational amplifier U5 is connected to the output terminal of the operational amplifier U5 and one end of the capacitor C5 in common and outputs the VCOM voltage, and the other end of the capacitor C5 is grounded.
A delay control method for a liquid crystal display comprises the following steps:
step 1: the power supply circuit receives the AVDD power supply output of the T-Con board, and outputs the AVDD power supply output to the switch circuit for power supply after voltage stabilization and filtering of the capacitor C2;
step 2: the control circuit receives an electrifying signal of a main control chip MCU of the T-Con board and outputs a power supply VCC, a delay time is set according to a resistor R1 and a capacitor C1, and a control signal is generated after the delay is finished and is output to the switch circuit;
and step 3: the switching circuit is powered by the power supply circuit, is conducted when receiving the control signal and provides working voltage for the gamma voltage output circuit;
and 4, step 4: the gamma voltage output circuit outputs 14 paths of gamma voltages to the liquid crystal display, and simultaneously outputs a reference voltage to the VCOM voltage output amplifying circuit;
and 5: the VCOM voltage output amplifying circuit receives the reference voltage, performs amplification and voltage stabilization processing, and outputs the VCOM amplified voltage to the liquid crystal display.
A display panel comprises the delay control circuit on the liquid crystal display.
A liquid crystal display comprises the display panel.
A non-transitory computer-readable storage medium having stored thereon a computer program which, when executed by a processor, implements the above-described power-on delay control method for a liquid crystal display.
Compared with the prior art, the invention adopting the technical scheme has the following technical effects:
1. the liquid crystal display power-on time delay control circuit can effectively solve the problem that the gamma voltage and the VCOM voltage in a non-control state generate voltage difference between the pixel electrode and the common electrode when the liquid crystal display is powered on, so that abnormal phenomena such as screen flashing, white lines and the like occur.
2. The power-on delay control circuit of the liquid crystal display does not need to provide extra power supply and signals, can realize the power-on delay of the gamma voltage and the VCOM voltage at low cost, only delays the gamma voltage and the VCOM voltage, and does not influence the normal work of other components on the T-Con board.
3. The delay control circuit on the liquid crystal display can flexibly adjust the delay time through matching the resistor R1 of the control circuit with the capacitor C1 so as to be used for different liquid crystal displays.
Drawings
Fig. 1 is a schematic diagram of the basic internal operation structure of a typical lcd.
FIG. 2 is a schematic diagram of a delay control circuit of an LCD according to the present invention.
FIG. 3 is a schematic circuit diagram of a delay control circuit for an LCD according to the present invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.
In one embodiment of the present invention, a delay control circuit for a liquid crystal display is provided, as shown in fig. 2 and 3, including a control circuit 10, a power circuit 20, a switch circuit 30, a gamma voltage output circuit 40, and a VCOM voltage output amplifying circuit 50. The output terminals of the control circuit 10 and the power supply circuit 20 are connected to the switch circuit 30, and the switch circuit 30, the gamma voltage output circuit 40 and the VCOM voltage output amplifying circuit 50 are connected in sequence.
The control circuit 10 is configured to receive a power-on signal (MCU _ EN) of a main control chip MCU of the T-Con board, generate an output power VCC through a power module U1, set a delay time through a resistor R1 and a capacitor C1, and output a control signal. The control circuit 10 includes a power module U1, a resistor R1, a capacitor C1, and an NMOS Q1, one end of the power module U1 is connected to the MCU, and is configured to receive an powering-on signal (MCU _ EN) of the MCU and output a power VCC, a product of a resistance of the resistor R1 and a capacitance of the capacitor C1 satisfies a time required by the MCU to normally output data from powering-on, one end of the resistor R1 is connected to a power output port of the power module U1, the other end of the resistor R1 is connected to one end of the capacitor C1 and a G electrode of the NMOS Q1, the other end of the capacitor C1 is grounded, an S electrode of the NMOS Q1 is grounded, a D electrode of the NMOS Q1 is connected to the switch circuit 20 as an output end of the control circuit 10, and a D electrode of the NMOS Q1 generates and. The NMOS tube Q1 is conducted after the delay time is over; the matching of the resistance value of the resistor R1 and the capacitance value of the capacitor C1 can realize the flexible adjustment of the delay time so as to be suitable for different types of liquid crystal displays.
The power circuit 20 is used for performing voltage-stabilizing filtering on the voltage provided by the T-Con board. The power circuit 20 comprises a resistor C2, one end of a capacitor C2 is connected with the AVDD power output port of the T-Con board and is connected with the switch circuit 30 as the output end of the power circuit 20, and the other end of the resistor C2 is grounded. Capacitor C2 is used to cancel interference in power supply AVDD.
VCC, AVDD, and power-on signal (MCU _ EN) are all signals and power supplies generated by a T-Con board (logic board) main control chip MCU, no additional power supply and signals are needed, and power-on delay of gamma voltage and VCOM voltage can be realized at low cost. And only the gamma voltage and the VCOM voltage are delayed, and the normal work of other components on the T-Con plate is not influenced.
The switching circuit 30 is used for controlling the gamma voltage output circuit 40 to be powered on or powered off according to the control signal. The switch circuit 30 comprises a resistor R3 and a PMOS tube Q3, one end of the resistor R3 is connected with the S pole of the PMOS tube Q3 and the output end of the power supply circuit 20, the other end of the resistor R3 is connected with the G pole of the PMOS tube Q3 and the output end of the control circuit 10, and the D pole of the PMOS tube Q3 is connected with the gamma voltage output circuit 40 as the output end of the switch circuit 30. The on or off of the PMOS tube Q3 can realize the controllability of power supply to the P Gamma IC U4 chip, and the purpose of controlling the time delay of Gamma voltage and VCOM voltage is achieved. When the NMOS transistor Q1 is not switched on, the resistor R3 ensures that the PMOS transistor Q3 is in a cut-off state, and ensures that a subsequent circuit does not work; when the grid of the PMOS tube Q3 is coupled with the ground, the grid is in a complete conducting state, and the subsequent circuit works normally.
The gamma voltage output circuit 40 outputs a gamma voltage to the liquid crystal display. The Gamma voltage output circuit 40 adopts a PGama IC U4 chip, the input end of the P Gamma IC U4 is connected with the output end of the switch circuit 30, the output end is connected with the liquid crystal display and the VCOM voltage output amplifying circuit 50, the P Gamma IC U4 outputs 14 paths of Gamma voltages to the liquid crystal display and outputs a reference voltage to the VCOM voltage output amplifying circuit 50.
The VCOM output amplifying circuit 50 increases its driving capability by the operational amplifier, eliminates the interference in the VCOM voltage by the capacitor C5, and outputs the VCOM amplified voltage to the liquid crystal display. The VCOM voltage output amplifying circuit 50 includes an operational amplifier U5 and a capacitor C5, wherein an input positive electrode of the operational amplifier U5 is connected to the output terminal of the gamma voltage output circuit 40 and receives a reference voltage, an input negative electrode of the operational amplifier U5 is connected to the output terminal of the operational amplifier U5 and one end of the capacitor C5 in common and outputs a VCOM voltage, and the other end of the capacitor C5 is grounded. The capacitor C5 is arranged to effectively reduce the influence of VCOM voltage ripple and load end, so that VCOM voltage keeps constant, thereby achieving the accuracy of the voltage difference between gamma voltage and VCOM voltage, making the gray scale brightness of the LCD more accurate, and improving the display quality. The operational amplifier is arranged to achieve the purpose of increasing VCOM voltage driving capability.
A display panel comprises the delay control circuit on the liquid crystal display.
A liquid crystal display comprises the display panel.
In another embodiment of the present invention, a method for controlling delay on a liquid crystal display is provided, including the steps of:
step 1: the power circuit 20 receives the AVDD power output of the T-Con board, and outputs the AVDD power output to the switch circuit 30 for power supply after voltage stabilization and filtering of the capacitor C2;
step 2: the control circuit 10 receives a power-on signal (MCU _ EN) of a main control chip MCU of the T-Con board and outputs a power supply VCC, a delay time is set according to the product of a resistor R1 and a capacitor C1, and a control signal is generated after the delay is finished and is output to the switch circuit 30;
and step 3: the switch circuit 30 is powered by the power circuit 20, is turned on when receiving the control signal, and provides the working voltage to the gamma voltage output circuit 40;
and 4, step 4: the gamma voltage output circuit 40 outputs 14 gamma voltages to the LCD, and also outputs a reference voltage to the VCOM voltage output amplifying circuit 50;
and 5: the VCOM output amplifying circuit 50 receives the reference voltage and performs an amplifying and voltage stabilizing process to output the VCOM amplified voltage to the LCD.
A non-transitory computer-readable storage medium having stored thereon a computer program which, when executed by a processor, implements the above-described power-on delay control method for a liquid crystal display.
The foregoing is directed to embodiments of the present invention and, more particularly, to a method and apparatus for controlling a power converter in a power converter, including a power converter, a power.
Claims (8)
1. A power-on delay control circuit of a liquid crystal display is characterized by comprising a control circuit (10), a power supply circuit (20), a switch circuit (30), a gamma voltage output circuit (40) and a VCOM voltage output amplifying circuit (50), wherein the output ends of the control circuit (10) and the power supply circuit (20) are respectively connected with the switch circuit (30), the gamma voltage output circuit (40) and the VCOM voltage output amplifying circuit (50) are sequentially connected, the control circuit (10) is used for receiving a power-on signal of a main control chip MCU of a T-Con board, generating VCC, a resistor (R1) and a capacitor (C1) through a power supply module (U1), setting delay time and outputting a control signal; the power supply circuit (20) is used for performing voltage-stabilizing filtering on the voltage provided by the T-Con board; the switching circuit (30) is used for controlling the on-off of the gamma voltage output circuit (40) according to the control signal; the gamma voltage output circuit (40) outputs the gamma voltage to the liquid crystal display, and the VCOM voltage output amplifying circuit (50) outputs the VCOM amplified voltage to the liquid crystal display; wherein:
the control circuit (10) comprises a power module (U1), a resistor (R1), a capacitor (C1) and an NMOS (N-channel metal oxide semiconductor) tube (Q1), one end of the power module (U1) is connected with the MCU and used for receiving an electrifying signal of the MCU and outputting a power VCC, the product of the resistance of the resistor (R1) and the capacitance of the capacitor (C1) meets the time required by the MCU from electrifying to normal data output, one end of the resistor (R1) is connected with a power output port of the power module (U1), the other end of the resistor (R1) is connected with one end of the capacitor (C1) and the G pole of the NMOS tube (Q1), the other end of the capacitor (C1) is grounded, the S pole of the NMOS tube (Q1) is grounded, the D pole of the NMOS tube (Q1) is used as the output end of the control circuit (10) and connected with the switch circuit (20), and the D pole of the NMOS tube (Q;
the switch circuit (30) comprises a resistor (R3) and a PMOS (P-channel metal oxide semiconductor) tube (Q3), one end of the resistor (R3) is connected with the S pole of the PMOS tube (Q3) and the output end of the power supply circuit (20) in a common mode, the other end of the resistor (R3) is connected with the G pole of the PMOS tube (Q3) and the output end of the control circuit (10) in a common mode, and the D pole of the PMOS tube (Q3) serves as the output end of the switch circuit (30) and is connected with the gamma voltage output circuit (40).
2. The delay control circuit of claim 1, wherein the power supply circuit (20) includes a resistor (C2), one end of the capacitor (C2) is connected to the AVDD power output port of the T-Con board and connected as the output terminal of the power supply circuit (20) to the switch circuit (30), and the other end of the resistor (C2) is grounded.
3. The delay control circuit of claim 1, wherein the Gamma voltage output circuit (40) is implemented by a P Gamma IC U4 chip, the input terminal of the P Gamma IC U4 is connected to the output terminal of the switch circuit (30), the output terminal is connected to both the liquid crystal display and the VCOM voltage output amplifier circuit (50), and the P Gamma IC U4 outputs 14 Gamma voltages to the liquid crystal display and outputs the reference voltage to the VCOM voltage output amplifier circuit (50).
4. The delay control circuit of claim 1, wherein the VCOM output amplifier circuit (50) comprises an operational amplifier (U5) and a capacitor (C5), wherein the positive input terminal of the operational amplifier U5 is connected to the output terminal of the gamma voltage output circuit (40) and receives the reference voltage, the negative input terminal of the operational amplifier U5 is connected to the output terminal of the operational amplifier U5 and one terminal of the capacitor (C5) and outputs the VCOM voltage, and the other terminal of the capacitor (C5) is connected to ground.
5. A method for controlling delay time on a liquid crystal display is characterized by comprising the following steps:
step 1: the power supply circuit (20) receives the AVDD power supply output of the T-Con board, and outputs the AVDD power supply output to the switch circuit (30) for power supply after voltage stabilizing and filtering of the capacitor (C2);
step 2: the control circuit (10) receives a power-on signal of a main control chip MCU of the T-Con board and outputs a power supply VCC, a delay time is set according to the product of a resistor (R1) and a capacitor (C1), and a control signal is generated after the delay is finished and is output to the switch circuit (30);
and step 3: the switch circuit (30) is powered by the power supply circuit (20), is conducted when receiving the control signal, and provides working voltage for the gamma voltage output circuit (40);
and 4, step 4: the gamma voltage output circuit (40) outputs 14 gamma voltages to the liquid crystal display, and also outputs a reference voltage to the VCOM voltage output amplifying circuit (50);
and 5: the VCOM voltage output amplifying circuit (50) receives the reference voltage and performs an amplifying and voltage stabilizing process to output the VCOM amplified voltage to the liquid crystal display.
6. A display panel comprising the delay control circuit for a liquid crystal display according to any one of claims 1 to 4.
7. A liquid crystal display comprising the display panel of claim 6.
8. A non-transitory computer readable storage medium having stored thereon a computer program, wherein the program when executed by a processor implements the power-on delay control method of the liquid crystal display of claim 5.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911006586.1A CN110728961A (en) | 2019-10-22 | 2019-10-22 | Delay control circuit and control method on liquid crystal display |
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| CN201911006586.1A CN110728961A (en) | 2019-10-22 | 2019-10-22 | Delay control circuit and control method on liquid crystal display |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113066449A (en) * | 2021-03-22 | 2021-07-02 | 重庆惠科金渝光电科技有限公司 | Screen flash eliminating circuit, display panel and display device |
| CN113205763A (en) * | 2021-05-20 | 2021-08-03 | 合肥京东方显示技术有限公司 | Start control module, start control method and display device |
| CN113889048A (en) * | 2021-09-24 | 2022-01-04 | 惠科股份有限公司 | Anti-flash screen circuit, display panel and display |
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Application publication date: 20200124 |