CN112017608A - Liquid crystal display and voltage regulating method thereof - Google Patents
Liquid crystal display and voltage regulating method thereof Download PDFInfo
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- CN112017608A CN112017608A CN202010904735.2A CN202010904735A CN112017608A CN 112017608 A CN112017608 A CN 112017608A CN 202010904735 A CN202010904735 A CN 202010904735A CN 112017608 A CN112017608 A CN 112017608A
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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
- G09G3/3611—Control of matrices with row and column drivers
- G09G3/3648—Control of matrices with row and column drivers using an active matrix
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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
- G09G3/3611—Control of matrices with row and column drivers
- G09G3/3696—Generation of voltages supplied to electrode drivers
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- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Physics & Mathematics (AREA)
- Computer Hardware Design (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
Abstract
A liquid crystal display and a voltage adjusting method thereof. The liquid crystal display comprises a direct current voltage converter, a time sequence controller, a memorizer and a processor. The processor reads the relation table from the memory to obtain the working voltage of the time schedule controller and controls the direct current voltage converter to output a first working voltage to the time schedule controller.
Description
Technical Field
The invention relates to a liquid crystal display and a voltage adjusting method thereof. Specifically, the liquid crystal display of the invention can obtain the working voltage of the time schedule controller from the relation table, and directly control the direct current voltage converter to provide corresponding voltage for the time schedule controller so as to reduce the number of resistors required by the direct current voltage converter.
Background
In the liquid crystal display, different timing controllers require different operating voltages. However, in many manufacturers designing the timing controller, the operating voltage set for the timing controller by each manufacturer is also different. To avoid the burning of the timing controller due to the excessive voltage, the voltage supplied to the timing controller is mainly adjusted by providing two voltage dividing resistors in the dc voltage converter, such as the voltage dividing resistor R shown in fig. 1D1、RD2。
Since the precision of the operating voltage required by the timing controller is high, the voltage dividing resistor for adjusting the voltage supplied to the timing controller also requires high precision to meet the requirement of the operating voltage of the timing controller. In practical applications, the timing controller usually needs a plurality of sets of operating voltages, and therefore, a plurality of pairs of voltage dividing resistors with high precision need to be arranged, which not only increases the difficulty of circuit layout, but also increases the cost of component production, resulting in a substantial increase in design cost. In addition, the voltage dividing resistors all have fixed resistance values and cannot be adjusted randomly, so that some special voltages cannot be generated, and the set voltages cannot be debugged through software.
Accordingly, there is a need in the art for a voltage regulation mechanism that not only can simplify the number of resistors required by the dc voltage converter, but also can enable the dc voltage converter to accurately output the operating voltage required by the timing controller.
Disclosure of Invention
The invention aims to provide a voltage regulation mechanism, which records the working voltage required by a time schedule controller in a relation table, so that when a liquid crystal display operates, a processor can directly control a direct current voltage converter to output the corresponding working voltage to the time schedule controller after acquiring the required working voltage of the time schedule controller from the relation table. Therefore, the liquid crystal display of the invention can generate the working voltage required by the time schedule controller without arranging a plurality of pairs of voltage dividing resistors with high precision.
To achieve the above objective, the present invention discloses a liquid crystal display, which includes a dc voltage converter, a timing controller, a memory and a processor. The memory is used for storing a relation table. The relationship table records a relationship between a plurality of types of the timing controller and a plurality of first voltages. The processor is electrically connected to the DC voltage converter, the time schedule controller and the memory, and is used for reading the relation table to obtain a first working voltage of the time schedule controller and controlling the DC voltage converter to output the first working voltage to the time schedule controller.
In addition, the invention further discloses a voltage regulation method which is suitable for the liquid crystal display. The liquid crystal display comprises a direct current voltage converter, a time sequence controller, a memory and a processor. The memory stores a relationship table. The relationship table records a relationship between a plurality of types of the timing controller and a plurality of first voltages. The voltage regulation method is performed by the processor and includes: reading the relation table to obtain a first working voltage of the time schedule controller; and controlling the direct-current voltage converter to output the first working voltage to the time sequence controller.
Other objects, technical means and embodiments of the present invention will be apparent to those skilled in the art from the accompanying drawings and the embodiments described later.
Drawings
Fig. 1 depicts an implementation scenario of voltage regulation by voltage dividing resistors in the prior art.
FIG. 2 depicts a schematic diagram of a liquid crystal display of the present invention.
FIG. 3 depicts a schematic diagram of a liquid crystal display of the present invention.
Fig. 4 depicts an implementation scenario between the dc-dc converter and the timing controller according to the present invention.
FIG. 5 depicts a schematic diagram of a liquid crystal display of the present invention.
FIG. 6 depicts an implementation scenario between the DC voltage converter and the gate driver of the present invention.
FIG. 7 depicts an implementation scenario between the DC voltage converter and the source driver of the present invention.
FIG. 8 is a flow chart of a voltage regulation method of the present invention.
FIG. 9 is a flow chart of a voltage regulation method of the present invention.
Detailed Description
The present disclosure is illustrated by the following examples, which are not intended to limit the invention to any particular environment, application, or particular manner in which the invention may be practiced. Therefore, the description of the embodiments is for the purpose of illustration only, and not for the purpose of limitation. It should be noted that in the following embodiments and the accompanying drawings, components which are not directly related to the present invention are omitted and not shown, and the dimensional relationship between the components in the drawings is only for easy understanding and is not intended to limit the actual scale.
Please refer to fig. 2-4 for a first embodiment of the present invention. FIG. 2 depicts a schematic diagram of a liquid crystal display of the present invention. The liquid crystal display 1 includes a dc voltage converter 11, a timing controller 13, a memory 15, and a processor 17. The dc voltage converter 11 is used to provide the operating voltage required by each circuit in the liquid crystal display 1, and since the voltage range in which each circuit can operate is different and the voltage accuracy requirement is different, if the power supply with unstable voltage is supplied at will, the problems of malfunction or characteristic degradation will be caused. Therefore, the dc voltage converter 11 needs to generate the corresponding voltages one by one, so that each circuit can operate stably.
The timing controller 13 is configured to convert the input low voltage differential signal into a control signal required by a subsequent circuit. The memory 15 is used for storing the relationship table 152. The relationship table 152 records relationships between a plurality of timing controller models and a plurality of first voltages. Specifically, the relation table 152 records the operating voltages required by each model of the circuit (e.g., the timing controller 13) of the LCD 1 with high precision for the voltage.
The processor 17 is electrically connected to the dc-dc converter 11, the timing controller 13 and the memory 15. When the liquid crystal display 1 is in operation, the processor 17 reads the relation table 152, obtains a first voltage corresponding to the timing controller 13 according to the model of the timing controller 13, uses the first voltage as a first operating voltage required by the timing controller 13 when the liquid crystal display 1 is in operation, and controls the dc-to-dc converter 11 to output the first operating voltage to the timing controller 13.
For example, the processor 17 may be a Field Programmable Gate Array (FPGA), and in the design stage, the FPGA is programmed to read the instruction of the relation table 152 and the instruction for controlling the dc voltage converter 11, so that when the liquid crystal display 1 is in operation, the processor 17 can control the dc voltage converter 11 to output the working voltage (i.e. the first working voltage) required by the timing controller 13 after reading the relation table 152 and obtaining the first voltage from the timing controller 13.
Therefore, unlike the prior art in which the dc voltage converter needs to adjust the voltage output to each circuit through the voltage dividing resistor, the lcd 1 of the present invention determines the operating voltage required for the operation of each circuit in the lcd 1 in the design stage, and records the operating voltage in the relation table 152, so that the dc voltage converter 11 can output the corresponding voltage without using the voltage dividing resistor.
In an embodiment, the dc voltage converter 11 may be disposed in the timing controller 13, as shown in fig. 3, if no other dc voltage converter is disposed in the lcd 1, so that the dc voltage converter 11 disposed in the timing controller 13 still needs to provide voltage to other circuits in the lcd 1, some of the pins of the timing controller 13 are the pins of the dc voltage converter 11.
Referring to fig. 4, the liquid crystal display 1 includes a first diode D1, a first resistor R1, and a second resistor R2. The first resistor R1 is coupled between the first output terminal Pout1 of the dc voltage converter 11 and the first input terminal Pin1 of the timing controller 13. The first diode D1 may be a component having a protection function (e.g., but not limited to, a transient voltage suppression diode), the first terminal P1 of the first diode D1 is coupled to the first input terminal Pin1 of the timing controller 13, the second terminal P2 of the first diode D1 is coupled to the third terminal P3 of the second resistor R2, and the fourth terminal P4 of the second resistor R2 is coupled to the first input terminal Pin1 of the timing controller 13. The first diode D1, the first resistor R1, and the second resistor R2 form a protection circuit, which is disposed between the dc-to-dc converter 11 and the timing controller 13 for protecting the receiving end device (timing controller 13).
Please refer to fig. 5 and 6 for a second embodiment of the present invention. The second embodiment is an extension of the first embodiment. In the present embodiment, the liquid crystal display 1 further includes a gate driver 2 and a source driver 3. The gate driver 2 is used to drive scan lines on the panel 4. The source driver 3 is used for driving data lines on the panel 4.
Similar to the first embodiment, the relationship table 152 further records the relationship between the plurality of gate driver models and the plurality of second voltages and the relationship between the plurality of source driver models and the plurality of third voltages, the processor 17 reads the relationship table 152, obtains the second voltage (i.e., the second operating voltage) corresponding to the gate driver 2 according to the model of the gate driver 2, and obtains the third voltage (i.e., the third operating voltage) corresponding to the source driver 3 according to the model of the source driver 3, and controls the dc voltage converter 11 to output the second operating voltage to the gate driver 2, and controls the dc voltage converter 11 to output the third operating voltage to the source driver 3. Therefore, the dc voltage converter 11 of the present invention can accurately output the operating voltage required by the gate driver 2 and the source driver 3 without adjusting the voltage through the voltage dividing resistor.
Referring to fig. 7, the liquid crystal display 1 further includes a second diode D2, a third diode D3, a third resistor R3, a fourth resistor R4, a fifth resistor R5 and a sixth resistor R6. The third resistor R3 is coupled between the second output terminal Pout2 of the dc voltage converter 11 and the second input terminal Pin2 of the gate driver 2. The second diode D2 may also be a component with a protection function (e.g., but not limited to, a transient voltage suppression diode). The fifth terminal P5 of the second diode D2 is coupled to the second input terminal Pin2 of the gate driver 2, the sixth terminal P6 of the second diode D2 is coupled to the seventh terminal P7 of the fourth resistor R4, and the eighth terminal P8 of the fourth resistor R4 is coupled to the second input terminal Pin2 of the gate driver 2. The second diode D2, the third resistor R3, and the fourth resistor R4 form a protection circuit, which is disposed between the dc-to-dc converter 11 and the timing controller 13 for protecting the receiving-end device (timing controller 13).
The fifth resistor R5 is coupled between the third output terminal Pout3 of the dc voltage converter 11 and the third input terminal Pin3 of the source driver 3, the ninth terminal P9 of the third diode D3 is coupled to the third input terminal Pin3 of the source driver 3, the tenth terminal P10 of the third diode D3 is coupled to the eleventh terminal P11 of the sixth resistor R6, and the twelfth terminal P12 of the sixth resistor R6 is coupled to the third input terminal Pin3 of the source driver 3. The third diode D3 may also be a component with a protection function (e.g., but not limited to, a transient voltage suppression diode).
A third embodiment of the present invention describes a voltage regulation method, and a flowchart thereof is shown in fig. 8. The voltage regulation method is suitable for liquid crystal displays, for example: the liquid crystal display 1 of the foregoing embodiment. The liquid crystal display comprises a direct current voltage converter, a time sequence controller, a memorizer and a processor. The memory stores a relationship table. The processor is electrically connected to the DC voltage converter, the time schedule controller and the memory. The voltage regulation method is performed by a processor and includes the steps described below.
First, in step S802, the relation table is read to obtain a first operating voltage of the timing controller. In step S804, the dc voltage converter is controlled to output the first working voltage to the timing controller.
In one embodiment, the dc voltage converter is disposed in the timing controller.
In one embodiment, the liquid crystal display further includes a first diode, a first resistor, and a second resistor. The first resistor is coupled between a first output terminal of the DC voltage converter and a first input terminal of the timing controller. A first terminal of the first diode is coupled to a first input terminal of the timing controller, a second terminal of the first diode is coupled to a third terminal of the second resistor, and a fourth terminal of the second resistor is coupled to a first input terminal of the timing controller.
The fourth embodiment of the present invention is an extension of the third embodiment. In this embodiment, the liquid crystal display further includes a gate driver and a source driver. A fourth embodiment of the present invention describes a voltage regulation method, and a flowchart thereof is shown in fig. 9.
In step S902, the relationship table is read to obtain a second operating voltage of the gate driver and a third operating voltage of the source driver. In step S904, the dc voltage converter is controlled to output the second working voltage to the gate driver. In step S906, the dc voltage converter is controlled to output a third operating voltage to the source driver.
In one embodiment, the liquid crystal display further includes a second diode, a third resistor, a fourth resistor, a fifth resistor, and a sixth resistor. The third resistor is coupled between the second output terminal of the dc voltage converter and the second input terminal of the gate driver, the fifth terminal of the second diode is coupled to the second input terminal of the gate driver, the sixth terminal of the second diode is coupled to the seventh terminal of the fourth resistor, and the eighth terminal of the fourth resistor is coupled to the second input terminal of the gate driver.
The fifth resistor is coupled between the third output terminal of the dc voltage converter and the third input terminal of the source driver, the ninth terminal of the third diode is coupled to the third input terminal of the source driver, the tenth terminal of the third diode is coupled to the eleventh terminal of the sixth resistor, and the twelfth terminal of the sixth resistor is coupled to the third input terminal of the source driver.
In addition to the above steps, the voltage regulating method of the present invention can also perform all the operations described in all the foregoing embodiments and have all the corresponding functions, and those skilled in the art can directly understand how to perform the operations and have the functions based on all the foregoing embodiments, and thus the description is omitted.
In summary, the voltage adjustment mechanism of the present invention can obtain the operating voltage required by each circuit by reading the relationship table, so that the dc voltage converter does not need to use a plurality of pairs of voltage dividing resistors with high precision to adjust the voltage, and can generate the operating voltage required by each circuit with high precision.
The above-mentioned embodiments are only used to illustrate the implementation of the present invention and to explain the technical features of the present invention, and are not used to limit the protection scope of the present invention. Any arrangement which can be easily changed or equalized by a person skilled in the art is included in the scope of the present invention, and the scope of the present invention is defined by the appended claims.
Claims (10)
1. A liquid crystal display, comprising:
a DC voltage converter;
a time schedule controller;
a memory for storing a relationship table recording relationships between a plurality of timing controller models and a plurality of first voltages; and
and the processor is electrically connected to the direct-current voltage converter, the time sequence controller and the memory and is used for reading the relation table to obtain a first working voltage of the time sequence controller and controlling the direct-current voltage converter to output the first working voltage to the time sequence controller.
2. The liquid crystal display of claim 1, wherein the dc voltage converter is disposed in the timing controller.
3. The liquid crystal display of claim 1, further comprising a first diode, a first resistor, and a second resistor, the first resistor coupled between a first output terminal of the dc voltage converter and a first input terminal of the timing controller, a first terminal of the first diode coupled to the first input terminal of the timing controller, a second terminal of the first diode coupled to a third terminal of the second resistor, a fourth terminal of the second resistor coupled to the first input terminal of the timing controller.
4. The lcd of claim 1, further comprising a gate driver and a source driver, wherein the relationship table further records relationships between a plurality of gate driver models and a plurality of second voltages and relationships between a plurality of source driver models and a plurality of third voltages, and the processor reads the relationship table, obtains a second operating voltage of the gate driver and a third operating voltage of the source driver, controls the dc voltage converter to output the second operating voltage to the gate driver, and controls the dc voltage converter to output the third operating voltage to the source driver.
5. The liquid crystal display of claim 4, further comprising a second diode, a third resistor, a fourth resistor, a fifth resistor, and a sixth resistor, the third resistor being coupled between a second output terminal of the DC voltage converter and a second input terminal of the gate driver, a fifth terminal of the second diode being coupled to the second input terminal of the gate driver, a sixth terminal of the second diode being coupled to a seventh terminal of the fourth resistor, an eighth terminal of the fourth resistor being coupled to the second input terminal of the gate driver, the fifth resistor being coupled between a third output terminal of the DC voltage converter and a third input terminal of the source driver, a ninth terminal of the third diode being coupled to the third input terminal of the source driver, a tenth terminal of the third diode is coupled to an eleventh terminal of the sixth resistor, and a twelfth terminal of the sixth resistor is coupled to the third input terminal of the source driver.
6. A voltage adjustment method, suitable for a liquid crystal display, comprising a dc voltage converter, a timing controller, a memory, and a processor, the memory storing a relationship table recording relationships between a plurality of timing controller models and a plurality of first voltages, the voltage adjustment method being performed by the processor and comprising:
reading the relation table to obtain a first working voltage of the time schedule controller; and
and controlling the direct-current voltage converter to output the first working voltage to the time sequence controller.
7. The voltage regulation method of claim 6 wherein the DC-to-DC converter is disposed in the timing controller.
8. The voltage regulation method of claim 6, wherein the liquid crystal display further comprises a first diode, a first resistor, and a second resistor, the first resistor being coupled between a first output terminal of the DC-to-DC converter and a first input terminal of the timing controller, a first terminal of the first diode being coupled to the first input terminal of the timing controller, a second terminal of the first diode being coupled to a third terminal of the second resistor, a fourth terminal of the second resistor being coupled to the first input terminal of the timing controller.
9. The voltage adjustment method of claim 6, wherein the liquid crystal display further comprises a gate driver and a source driver, the relationship table further records relationships between a plurality of gate driver models and a plurality of second voltages and relationships between a plurality of source driver models and a plurality of third voltages, the voltage adjustment method comprising:
reading the relation table to obtain a second working voltage of the grid driver and a third working voltage of the source driver;
controlling the direct-current voltage converter to output the second working voltage to the gate driver; and
and controlling the direct-current voltage converter to output the third working voltage to the source driver.
10. The voltage adjustment method of claim 9, wherein the liquid crystal display further comprises a second diode, a third resistor, a fourth resistor, a fifth resistor, and a sixth resistor, the third resistor is coupled between a second output terminal of the DC-to-DC converter and a second input terminal of the gate driver, a fifth terminal of the second diode is coupled to the second input terminal of the gate driver, a sixth terminal of the second diode is coupled to a seventh terminal of the fourth resistor, an eighth terminal of the fourth resistor is coupled to the second input terminal of the gate driver, the fifth resistor is coupled between a third output terminal of the DC-to-DC converter and a third input terminal of the source driver, a ninth terminal of the third diode is coupled to the third input terminal of the source driver, a tenth terminal of the third diode is coupled to an eleventh terminal of the sixth resistor, and a twelfth terminal of the sixth resistor is coupled to the third input terminal of the source driver.
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| CN202010904735.2A CN112017608B (en) | 2020-09-01 | 2020-09-01 | Liquid crystal display and voltage regulating method thereof |
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| CN202010904735.2A CN112017608B (en) | 2020-09-01 | 2020-09-01 | Liquid crystal display and voltage regulating method thereof |
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| CN112017608A true CN112017608A (en) | 2020-12-01 |
| CN112017608B CN112017608B (en) | 2022-11-04 |
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