CN217361095U - LCD display control circuit and device - Google Patents
LCD display control circuit and device Download PDFInfo
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- CN217361095U CN217361095U CN202220252055.1U CN202220252055U CN217361095U CN 217361095 U CN217361095 U CN 217361095U CN 202220252055 U CN202220252055 U CN 202220252055U CN 217361095 U CN217361095 U CN 217361095U
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Abstract
The utility model discloses a LCD display control circuit and equipment, the LCD display control circuit comprises a main control chip, a VGA conversion chip, a VGA transmission circuit and a VGA interface circuit; the main control chip is connected with the VGA conversion chip and used for outputting a first video signal; the VGA conversion chip is connected with the VGA transmission circuit and the VGA interface circuit and is used for processing the first video signal to form a second video signal and an image control signal, transmitting the second video signal to the VGA transmission circuit and transmitting the image control signal to the VGA interface circuit; the VGA transmission circuit is connected with the VGA interface circuit and used for processing the second video signal to form a third video signal and transmitting the third video signal to the VGA interface circuit; the VGA interface circuit is connected with the LCD display screen and used for controlling the LCD display screen to work according to the third video signal and the image control signal. The technical scheme can simplify the LCD display control circuit and improve the reliability of the LCD display control circuit.
Description
Technical Field
The utility model relates to a display screen control technical field especially relates to a LCD display control circuit and equipment.
Background
The existing equipment is equipped with an LCD display screen and an LCD display control circuit for controlling the LCD display screen to work, and is used for playing pictures, characters and the like. However, the existing LCD display control circuit has a complex structure, resulting in high cost, easy circuit failure, inconvenient fault maintenance and poor reliability.
SUMMERY OF THE UTILITY MODEL
An embodiment of the utility model provides a LCD shows control circuit and equipment to it is comparatively complicated to solve LCD display control circuit structure, the relatively poor problem of reliability.
An LCD display control circuit comprises a main control chip, a VGA conversion chip, a VGA transmission circuit and a VGA interface circuit;
the main control chip is connected with the VGA conversion chip and used for outputting a first video signal;
the VGA conversion chip is connected with the VGA transmission circuit and the VGA interface circuit and is used for processing the first video signal to form a second video signal and an image control signal, transmitting the second video signal to the VGA transmission circuit and transmitting the image control signal to the VGA interface circuit;
the VGA transmission circuit is connected with the VGA interface circuit and used for processing the second video signal to form a third video signal and transmitting the third video signal to the VGA interface circuit;
and the VGA interface circuit is connected with the LCD display screen and is used for controlling the LCD display screen to work according to the third video signal and the image control signal.
Further, the VGA transmission circuit includes a first transmission circuit, a second transmission circuit and a third transmission circuit;
the input end of the first transmission circuit is connected with the R channel output port of the VGA conversion chip, and the output end of the first transmission circuit is connected with the R channel input port of the VGA interface circuit;
the input end of the second transmission circuit is connected with the G channel output port of the VGA conversion chip, and the output end of the second transmission circuit is connected with the G channel input port of the VGA interface circuit;
the input end of the third transmission circuit is connected with the B channel output port of the VGA conversion chip, and the output end of the second transmission circuit is connected with the B channel input port of the VGA interface circuit.
Further, the first transmission circuit includes a first magnetic bead, and the first magnetic bead is disposed between the R-channel output port of the VGA conversion chip and the R-channel input port of the VGA interface circuit;
the second transmission circuit comprises a second magnetic bead which is arranged between a G channel output port of the VGA conversion chip and a G channel input port of the VGA interface circuit;
the third transmission circuit comprises a third magnetic bead, and the third magnetic bead is arranged between a B channel output port of the VGA conversion chip and a B channel input port of the VGA interface circuit.
Further, the first transmission circuit further comprises a first matching resistor; the second transmission circuit further comprises a second matching resistor; the third transmission circuit further comprises a third matching resistor;
one end of the first matching resistor is connected with a connection node between an R channel output port of the VGA conversion chip and the first magnetic bead, and the other end of the first matching resistor is grounded;
one end of the second matching resistor is connected with a connection node between the G channel output port of the VGA conversion chip and the second magnetic bead, and the other end of the second matching resistor is grounded;
one end of the third matching resistor is connected with a connection node between the B channel output port of the VGA conversion chip and the third magnetic bead, and the other end of the third matching resistor is grounded.
Further, the first transmission circuit further comprises a first electrostatic protection tube; the second transmission circuit further comprises a second electrostatic protection tube; the third transmission circuit further comprises a third electrostatic protection tube;
one end of the first electrostatic protection tube is connected with a connection node between the first magnetic bead and the R channel input port, and the other end of the first electrostatic protection tube is grounded;
one end of the second electrostatic protection tube is connected with a connection node between the second magnetic bead and the G channel input port, and the other end of the second electrostatic protection tube is grounded;
one end of the third electrostatic protection tube is connected with a connection node between the third magnetic bead and the B channel input port, and the other end of the third electrostatic protection tube is grounded.
Further, the VGA conversion chip comprises at least one control output port;
the VGA interface circuit comprises at least one control input port;
the LCD display control circuit also comprises at least one attenuation circuit, and each attenuation circuit is arranged between the control output port of the VGA conversion chip and the control input port of the VGA interface circuit.
Further, the attenuation circuit includes an attenuation resistor.
Furthermore, the VGA interface circuit further comprises an electrostatic protection circuit; the electrostatic protection circuit is arranged between the control input port and a grounding end.
Further, the electrostatic protection circuit comprises a fourth electrostatic protection tube and/or a fifth electrostatic protection tube.
An equipment comprises an LCD display screen and the LCD display control circuit.
The LCD display control circuit comprises a main control chip, a VGA conversion chip, a VGA transmission circuit and a VGA interface circuit, by connecting the main control chip with the VGA conversion chip, connecting the VGA conversion chip with the VGA transmission circuit and the VGA interface circuit, the VGA transmission circuit is connected with the VGA interface circuit, the VGA interface circuit is connected with an LCD display screen, the LCD display screen can be controlled through the main control chip, the VGA conversion chip, the VGA transmission circuit and the VGA interface circuit, the circuit structure of the LCD display control circuit is simplified, so that the LCD display control circuit is convenient to maintain, at the same time, the second video signal is processed by the VGA transmission circuit, such as filtering, impedance matching and electrostatic protection, to form a third video signal, so that the third video signal has higher signal quality and the reliability of the LCD display control circuit is improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required to be used in the description of the embodiments of the present invention will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive labor.
Fig. 1 is a circuit diagram of an LCD display control circuit according to an embodiment of the present invention;
fig. 2 is another circuit diagram of an LCD display control circuit according to an embodiment of the present invention;
fig. 3 is another circuit diagram of the LCD display control circuit according to an embodiment of the present invention.
In the figure: 10. a main control chip; 20. a VGA conversion chip; 30. a VGA transmission circuit; 31. a first transmission circuit; 32. a second transmission circuit; 33. a third transmission circuit; 40. a VGA interface circuit; 50. an attenuation circuit; 60. an electrostatic protection circuit.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, not all, of the embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
It is to be understood that the present invention may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. In the drawings, the size and relative sizes of layers and regions may be exaggerated for clarity to indicate like elements throughout.
It will be understood that when an element or layer is referred to as being "on" …, "adjacent to …," "connected to" or "coupled to" other elements or layers, it can be directly on, adjacent to, connected to or coupled to the other elements or layers or intervening elements or layers may be present. In contrast, when an element is referred to as being "directly on …", "directly adjacent to …", "directly connected to" or "directly coupled to" other elements or layers, there are no intervening elements or layers present. It will be understood that, although the terms first, second, third, etc. may be used to describe various elements, components, regions, layers and/or sections, these elements, components, regions, layers and/or sections should not be limited by these terms. These terms are only used to distinguish one element, component, region, layer or section from another element, component, region, layer or section. Thus, a first element, component, region, layer or section discussed below could be termed a second element, component, region, layer or section without departing from the teachings of the present invention.
Spatial relationship terms such as "under …", "under …", "below", "under …", "above …", "above", and the like, may be used herein for ease of description to describe the relationship of one element or feature to another element or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, then elements or features described as "below" or "beneath" other elements or features would then be oriented "above" the other elements or features. Thus, the exemplary terms "below …" and "below …" can encompass both an orientation of up and down. The device may be otherwise oriented (rotated 90 degrees or at other orientations) and the spatial descriptors used herein interpreted accordingly.
The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. As used herein, the term "and/or" includes any and all combinations of the associated listed items.
In order to provide a thorough understanding of the present invention, the following description will provide detailed structures and steps for illustrating the technical solutions provided by the present invention. The preferred embodiments of the present invention are described in detail below, however, other embodiments of the present invention are possible in addition to these detailed descriptions.
The present embodiment provides an LCD display control circuit, as shown in fig. 1, including a main control chip 10, a VGA conversion chip 20, a VGA transmission circuit 30 and a VGA interface circuit 40; the main control chip 10 is connected with the VGA conversion chip 20 and used for outputting a first video signal; the VGA conversion chip 20 is connected with the VGA transmission circuit 30 and the VGA interface circuit 40 and is used for processing the first video signal to form a second video signal and an image control signal, transmitting the second video signal to the VGA transmission circuit 30 and transmitting the image control signal to the VGA interface circuit 40; the VGA transmission circuit 30 is connected to the VGA interface circuit 40, and is configured to process the second video signal to form a third video signal, and transmit the third video signal to the VGA interface circuit 40; the VGA interface circuit 40 is connected to the LCD screen and is configured to control the LCD screen to operate according to the third video signal and the image control signal.
The first video signal is a video signal to be converted. The second video signal is a video signal obtained by converting the first video signal. The third Video signal is a Video signal obtained by processing the second Video signal by a VGA (Video Graphics Array, VGA for short) transmission circuit. Illustratively, the processing of the second video signal by the VGA transmission circuit 30 includes, but is not limited to, filtering, impedance matching, electrostatic protection, and the like. The image control signal refers to a control signal for controlling an image picture parameter. The image picture parameters may be, for example, picture saturation, picture brightness, and the like.
As an example, the main control chip 10 is connected to the VGA conversion chip 20, and is configured to output a first video signal to be converted.
As an example, the VGA conversion chip 20 is connected to the VGA transmission circuit 30 and the VGA interface circuit 40. In this example, the VGA conversion chip 20 receives the first video signal sent by the main control chip 10, performs conversion processing on the first video signal to form a second video signal and an image control signal, transmits the second video signal to the VGA transmission circuit 30, and transmits the image control signal to the VGA interface circuit 40. Illustratively, the second video signal is a VGA-format video signal.
As another example, the VGA transmission circuit 30 is connected to the VGA interface circuit 40, and the VGA transmission circuit 30 receives the second video signal output from the VGA conversion chip 20, and processes the second video signal, such as filtering, impedance matching and electrostatic protection, to form a third video signal, so that the third video signal has high signal quality, and at the same time, transmits the third video signal to the VGA interface circuit 40.
As an example, the VGA interface circuit 40 is connected to the LCD screen, so that the VGA interface circuit 40 controls the LCD screen to operate according to the third video signal and the image control signal, thereby controlling the LCD screen.
In this embodiment, the LCD display control circuit includes a main control chip 10, a VGA conversion chip 20, a VGA transmission circuit 30 and a VGA interface circuit 40, the main control chip 10 is connected to the VGA conversion chip 20, the VGA conversion chip 20 is connected to the VGA transmission circuit 30 and the VGA interface circuit 40, the VGA transmission circuit 30 is connected to the VGA interface circuit 40, the VGA interface circuit 40 is connected to the LCD display screen, the main control chip 10, the VGA conversion chip 20, the VGA transmission circuit 30 and the VGA interface circuit 40 can control the LCD display screen, simplify the circuit structure of the LCD display control circuit to facilitate maintenance of the LCD display control circuit, and at the same time, the VGA transmission circuit 30 processes the second video signal, such as filtering, impedance matching and electrostatic protection, to form a third video signal, so that the third video signal has higher signal quality, the reliability of the LCD display control circuit is improved.
In one embodiment, as shown in fig. 2, the VGA transmission circuit 30 includes a first transmission circuit 31, a second transmission circuit 32 and a third transmission circuit 33; the first transmission circuit 31 is connected with an R channel output port of the VGA conversion chip 20 and an R channel input port of the VGA interface circuit 40; the second transmission circuit 32 is connected with the G channel output port of the VGA conversion chip 20 and the G channel input port of the VGA interface circuit 40; and a third transmission circuit 33 connected to the B-channel output port of the VGA conversion chip 20 and the B-channel input port of the VGA interface circuit 40.
In the present embodiment, the transmission of the second video signal in VGA format is realized by the first transmission circuit 31, the second transmission circuit 32, and the third transmission circuit 33, and the third video signal is output.
In an embodiment, as shown in fig. 2, the first transmission circuit 31 includes a first magnetic bead F86, a first magnetic bead F86, disposed between the R-channel output port of the VGA conversion chip 20 and the R-channel input port of the VGA interface circuit 40; the second transmission circuit 32 includes a second magnetic bead F87, a second magnetic bead F87, disposed between the G channel output port of the VGA conversion chip 20 and the G channel input port of the VGA interface circuit 40; the third transmission circuit 33 includes a third magnetic bead F88 and a third magnetic bead F88, which are disposed between the B-channel output port of the VGA conversion chip 20 and the B-channel input port of the VGA interface circuit 40.
In this embodiment, the first bead F86 in the first transmission circuit 31, the second bead F87 in the second transmission circuit 32, and the third bead F88 in the third transmission circuit 33 filter the second video signal, thereby improving the signal transmission quality.
In one embodiment, as shown in fig. 2, the first transmission circuit 31 further includes a first matching resistor R15; the second transmission circuit 32 further includes a second matching resistor R17; the third transmission circuit 33 further includes a third matching resistor R19; one end of the first matching resistor R15 is connected to a connection node between the output port of the R channel of the VGA conversion chip 20 and the first magnetic bead F86, and the other end of the first matching resistor R15 is grounded; one end of the second matching resistor R17 is connected to a connection node between the G channel output port of the VGA conversion chip 20 and the second magnetic bead F87, and the other end of the second matching resistor R17 is grounded; one end of the third matching resistor R19 is connected to a connection node between the B-channel output port of the VGA conversion chip 20 and the third magnetic bead F88, and the other end of the third matching resistor R19 is grounded.
In the present embodiment, the VGA transmission circuit 30 is impedance-matched by the first matching resistor R15 in the first transmission circuit 31, the second matching resistor R17 in the second transmission circuit 32, and the third matching resistor R19 in the third transmission circuit 33, so that the signal transmission quality is improved. Preferably, the first matching resistor R15, the second matching resistor R17 and the third matching resistor R19 have a resistance of 75 ohms.
In one embodiment, as shown in fig. 2, the first transmission circuit 31 further includes a first esd protection tube TVS 5; the second transmission circuit 32 further includes a second electrostatic protection tube TVS 6; the third transmission circuit 33 further includes a third electrostatic protection tube TVS 7; one end of a first electrostatic protection tube TVS5 is connected with a connection node between a first magnetic bead F86 and the R channel input port, and the other end of the first electrostatic protection tube TVS5 is grounded; the first end of the second electrostatic protection tube TVS6 is connected with a connection node between the second magnetic bead F87 and the G channel input port, and the other end of the second electrostatic protection tube TVS6 is grounded; a first end of the third electrostatic protection tube TVS7 is connected to a connection node between the third magnetic bead F88 and the B-channel input port, and the other end of the third electrostatic protection tube TVS7 is grounded.
In the embodiment, the VGA transmission circuit 30 is electrostatically protected by the first electrostatic protection tube TVS5 in the first transmission circuit 31, the first electrostatic protection tube TVS5 in the second transmission circuit 32, and the first electrostatic protection tube TVS5 in the third transmission circuit 33, so as to improve the safety of the VGA transmission circuit 30.
In one embodiment, as shown in fig. 2, the VGA conversion chip 20 includes at least one control output port; the VGA interface circuit 40 includes at least one control input port; the LCD display control circuit further includes at least one attenuation circuit 50, each attenuation circuit 50 being disposed between the control output port of the VGA conversion chip 20 and the control input port of the VGA interface circuit 40.
As an example, the VGA conversion chip 20 includes at least one control output port, such as a horizontal pixel control port and a vertical pixel control port. The control input port is a control port that matches the control output port.
In this embodiment, the LCD display control circuit further includes at least one attenuation circuit 50, and each attenuation circuit 50 is disposed between the control output port of the VGA conversion chip 20 and the control input port of the VGA interface circuit 40 to prevent the VGA conversion chip 20 from being damaged by the reverse electrical signal of the VGA interface circuit 40.
In one embodiment, as shown in FIG. 2, the damping circuit 50 includes a damping resistor. Such as R11, R12, R8, and R9 in fig. 2.
In the present embodiment, an attenuation resistor is disposed on the attenuation circuit 50 to attenuate the inverse electrical signal of the VGA interface circuit 40, so as to prevent the inverse electrical signal of the VGA interface circuit 40 from damaging the VGA conversion chip 20.
In one embodiment, as shown in fig. 3, the VGA interface circuit 40 further includes an electrostatic protection circuit 60; the electrostatic protection circuit 60 is disposed between the control input port and the ground terminal.
In this embodiment, the VGA interface circuit 40 further includes an electrostatic protection circuit 60; the electrostatic protection circuit 60 is disposed between the control input port and the ground terminal, and prevents the VGA interface circuit 40 from being electrostatically interfered.
In one embodiment, the electrostatic protection circuit 60 includes a fourth electrostatic protection tube TVS1 and/or a fifth electrostatic protection tube TVS 2.
As an example, the control input ports include a horizontal pixel control port and a vertical pixel control port. One end of the fourth electrostatic protection tube TVS1 is connected to the horizontal pixel control port, and the other end of the fourth electrostatic protection tube TVS1 is grounded. One end of the fifth electrostatic protection tube TVS2 is connected to the vertical pixel control port, and the other end of the fifth electrostatic protection tube TVS2 is grounded.
In the present embodiment, the esd protection circuit 60 includes a fourth esd protection tube TVS1 and/or a fifth esd protection tube TVS2, which prevents the VGA interface circuit 40 from being interfered by static electricity.
The embodiment provides equipment which comprises an LCD display screen and the LCD display control circuit.
The above-mentioned embodiments are only used for illustrating the technical solution of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the spirit and scope of the embodiments of the present invention, and are intended to be included within the scope of the present invention.
Claims (10)
1. An LCD display control circuit is characterized by comprising a main control chip, a VGA conversion chip, a VGA transmission circuit and a VGA interface circuit;
the main control chip is connected with the VGA conversion chip and used for outputting a first video signal;
the VGA conversion chip is connected with the VGA transmission circuit and the VGA interface circuit and is used for processing the first video signal to form a second video signal and an image control signal, transmitting the second video signal to the VGA transmission circuit and transmitting the image control signal to the VGA interface circuit;
the VGA transmission circuit is connected with the VGA interface circuit and used for processing the second video signal to form a third video signal and transmitting the third video signal to the VGA interface circuit;
and the VGA interface circuit is connected with the LCD display screen and is used for controlling the LCD display screen to work according to the third video signal and the image control signal.
2. The LCD display control circuit of claim 1, wherein the VGA transmission circuit includes a first transmission circuit, a second transmission circuit, and a third transmission circuit;
the first transmission circuit is connected with the R channel output port of the VGA conversion chip and the R channel input port of the VGA interface circuit;
the second transmission circuit is connected with the G channel output port of the VGA conversion chip and the G channel input port of the VGA interface circuit;
and the third transmission circuit is connected with the B channel output port of the VGA conversion chip and the B channel input port of the VGA interface circuit.
3. The LCD display control circuit of claim 2, wherein the first transmission circuit includes a first magnetic bead disposed between an R-channel output port of the VGA conversion chip and an R-channel input port of the VGA interface circuit;
the second transmission circuit comprises a second magnetic bead which is arranged between a G channel output port of the VGA conversion chip and a G channel input port of the VGA interface circuit;
the third transmission circuit comprises a third magnetic bead, and the third magnetic bead is arranged between a B channel output port of the VGA conversion chip and a B channel input port of the VGA interface circuit.
4. The LCD display control circuit of claim 3, wherein the first transmission circuit further comprises a first matching resistor; the second transmission circuit further comprises a second matching resistor; the third transmission circuit further comprises a third matching resistor;
one end of the first matching resistor is connected with a connection node between an R channel output port of the VGA conversion chip and the first magnetic bead, and the other end of the first matching resistor is grounded;
one end of the second matching resistor is connected with a connection node between the output port of the G channel of the VGA conversion chip and the second magnetic bead, and the other end of the second matching resistor is grounded;
one end of the third matching resistor is connected with a connection node between the B channel output port of the VGA conversion chip and the third magnetic bead, and the other end of the third matching resistor is grounded.
5. The LCD display control circuit of claim 3, wherein the first transmission circuit further comprises a first electrostatic protection tube; the second transmission circuit further comprises a second electrostatic protection tube; the third transmission circuit further comprises a third electrostatic protection tube;
one end of the first electrostatic protection tube is connected with a connection node between the first magnetic bead and the R channel input port, and the other end of the first electrostatic protection tube is grounded;
the first end of the second electrostatic protection tube is connected with a connection node between the second magnetic bead and the G channel input port, and the other end of the second electrostatic protection tube is grounded;
and the first end of the third electrostatic protection tube is connected with a connecting node between the third magnetic bead and the B channel input port, and the other end of the third electrostatic protection tube is grounded.
6. The LCD display control circuit of claim 1, wherein the VGA conversion chip includes at least one control output port;
the VGA interface circuit comprises at least one control input port;
the LCD display control circuit also comprises at least one attenuation circuit, and each attenuation circuit is arranged between the control output port of the VGA conversion chip and the control input port of the VGA interface circuit.
7. The LCD display control circuit of claim 6, wherein the attenuation circuit comprises an attenuation resistor.
8. The LCD display control circuit of claim 6, wherein the VGA interface circuit further comprises an electrostatic protection circuit; the electrostatic protection circuit is arranged between the control input port and a grounding end.
9. The LCD display control circuit according to claim 8, wherein the electrostatic protection circuit includes a fourth electrostatic protection tube and/or a fifth electrostatic protection tube.
10. A device comprising an LCD display screen and an LCD display control circuit according to any of claims 1 to 9, the LCD display control circuit being connected to the LCD display screen.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220252055.1U CN217361095U (en) | 2022-01-28 | 2022-01-28 | LCD display control circuit and device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220252055.1U CN217361095U (en) | 2022-01-28 | 2022-01-28 | LCD display control circuit and device |
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| Publication Number | Publication Date |
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| CN217361095U true CN217361095U (en) | 2022-09-02 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202220252055.1U Active CN217361095U (en) | 2022-01-28 | 2022-01-28 | LCD display control circuit and device |
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| CN (1) | CN217361095U (en) |
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- 2022-01-28 CN CN202220252055.1U patent/CN217361095U/en active Active
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