lcd panel schematic diagram in stock

TFT LCD panels always have a controller in there which is a CoG (chip on glass) type IC planted on to the panel to drive the rows and columns. The chip has referenace values and tables to drive the display to get the desired contrast and bias voltage needed to control the LCD pixels properly. Incorrect values can cause the panel to look low contrast and weak, or in the other extreme case cause permanent damage to the panel.

In addition to this, the LCD manufacturer configures the CoG LCD controller to use certain bias voltages that match the LCD panel characteristics (all LCD panels are not exactly the same). Here is an example from a 7″ display datasheet (ER-TFT07-2) with RGB interface.

Hey Guys How are you? I hope you are fine and we welcome you on today’s latest post of Ptechnicians.com So today we are going to share the China Universal TV Board Schematic Dia…

It is the components and how they connect to each other that create your unique, electronic circuit. In the schematic, you create the logical representation of your design by connecting the component pins together; to design the printed circuit board, you place the physical components and create the same connectivity with the routing.

Physical connectivity allows a user to follow each wire as they study the circuit, but a lot of wires can result in a dense and busy schematic. On the other hand, Net Labels reduce the amount of wiring, but the user must scan the sheet to find all potential connections. As the designer, you are free to decide which connectivity model best suits your design, including a mixture of both techniques.

As well as creating logical connectivity within a schematic sheet, there are also objects for creating logical connectivity between schematic sheets. The way this connectivity is created will depend on how you structure your schematic: either as a flat design or as a hierarchical design. More about this below.

The Altium Designer Connectivity Insight functionality (part of the Design Insight feature) displays an instant view of the connection relationships within a project. Shown as a document tree with optional schematic previews, the selectable elements provide a quick and visual way to navigate through a project"s connectivity structure.

The net connectivity throughout a design can also be highlighted in all schematics by holding the Alt key when selecting a net by clicking on a wire (Alt+Click).

The schematic editor includes the following objects that are used to create connectivity. Collectively these objects are referred to as net identifiers.

Used to connect a net from one schematic sheet to another sheet (not within the same sheet). Only supports horizontal connectivity (flat designs). OffSheet Connectors have limited functionality when compared to Ports.

A net identifier used to create connectivity to other Net Labels with the same name on the same schematic sheet. The net is automatically named by the Net Label. Net Labels can be placed on component pins, wires and buses. Note that Net Labels do not connect between sheets unless the project options are configured to use a Net Identifier Scope of Global.

Pins are placed in the schematic symbol editor to represent the physical pins on the component. Only one end of the pin is electrically active, which is sometimes referred to as the hot end of the pin.

Used to connect a net from one schematic sheet to another. Connectivity can be vertical in a hierarchical design, or horizontal in a flat design (vertical and horizontal designs are explained below). Port names are used to name nets if the Allow Ports to Name Nets option is enabled in the Options tab of the Project Optionsdialog. in this situation, Ports will also connect within a schematic sheet.

Creates connectivity to every other power port of the same name, throughout the schematic project, regardless of the design structure. The net is automatically named by the Power Port. This net can be localized to a specific schematic sheet if required.

A polyline electrical design primitive that is used to form electrical connections between points on a schematic. A Wire is analogous to a physical wire.

Electrical connectivity between schematic component pins can be created by placing a wire between those pins. This is called physical connectivity since the pins are physically connected with a wire. Connectivity also can be created logically by using suitable net identifiers, such as net labels. As well as providing a human-friendly identifier for a net, a net label allows you to connect points on a circuit without actually physically wiring them together.

If the Netproperty of the net label is entered before it is placed and the value entered has a numeric ending, each subsequent net label will auto-increment this numeric value. This behavior is configured in the Auto-Increment During Placement options on the Schematic – General page of the Preferences dialog. For net labels, only the Primary field applies; the Secondary field applies when the object has multiple fields, such as a Pin.

Net labels create logical connectivity within a single schematic sheet; they do not create connectivity between schematic sheets. To do this, Ports must be used.

Enable the Single "\" Negation option on the Schematic - Graphical Editing page of the Preferences dialog, then include one backslash character at the start of the net name (e.g., \ENABLE).

An off sheet connector is an electrical design primitive. Off sheet connectors are used to connect nets across multiple schematic sheets that are descended from the same parent sheet symbol.

If the Net property of the off sheet connector is entered before it is placed and the value entered has a numeric ending, each subsequent off sheet connector will auto-increment this numeric value. This behavior is configured in the Auto-Increment During Placement options on the Schematic – General page of the Preferences dialog. For off sheet connectors, only the Primary field applies; the Secondary field applies when the object has multiple fields, such as a Pin.

Note that the Cross Reference feature identifies the locations of interconnected Ports and positional grid references for interconnected off sheet connectors. For both types of schematic connection objects, the existing Reports » Port Cross Reference » Add To Project command adds a cross-reference parameter based on the target sheet name and a positional grid reference.

Off sheet connectors do not have independent font properties; they use the Document Font properties (also referred to as the System Font) of the schematic sheet on which they are placed. Double-click in the sheet border to edit the Document Options in the Propertiespanel including the font.

If the Net property of the off sheet connector is entered before it is placed and the value entered has a numeric ending, each subsequent off sheet connector will auto-increment this numeric value. This behavior is configured in the Auto-Increment During Placement options on the Schematic – General page of the Preferences dialog. For off sheet connectors, only the Primary field applies; the Secondary field applies when the object has multiple fields, such as a Pin.

Note that the Cross Reference feature identifies the locations of interconnected Ports and positional grid references for interconnected off sheet connectors. For both types of schematic connection objects, the existing Reports » Port Cross Reference » Add To Project command adds a cross-reference parameter based on the target sheet name and a positional grid reference.

A power port is an electrical design primitive. It is a special schematic object used to define a power or ground net. Power ports allow you to conveniently indicate a power net at any location in the design, which can then be connected to pins or wires. Power nets of the same name automatically connect throughout the design, except in the following two situations:

Single-clicking again (or pressing Enter) to enter the in-place editing mode. Sufficient time between each click should be given to ensure that the software does not interpret the two single-clicks as one double-click (which would open the Propertiespanel).

Enable the Single "\" Negation option on the Schematic - Graphical Editing page of the Preferences dialog, then include one backslash character at the start of the net name (e.g., \VCC3).

A wire is a polyline electrical design primitive that is used to form electrical connections between points on a schematic. It is analogous to a physical wire.

Schematics have a definable electrical grid that makes it easy to define electrical connections between objects. As you are placing a wire, when the wire falls within the electrical grid range of another electrical object, the cursor will snap to the fixed object and a Hot Spot (blue cross) will appear.

The electrical grid can be defined on the General tab of the Propertiespanel in Document Options mode. It is recommended that you set the electrical grid to be slightly smaller than the current snap grid or it can become difficult to position electrical objects one snap grid apart.

Depending on the affected wiring, performing a drag operation may result in the creation of auto-junctions at new locations. To provide visual feedback on where these new junction instances will be, hotspots are used. Enable the use of these hotspots and their color for wires and buses in the Auto-Junctions region on the Schematic - Compiler page of the Preferencesdialog.

A wire segment also can be removed through the use of the Break Wire feature (Edit » Break Wire), by first setting the Cutting Length option to Snap To Segment.on the Schematic - Break Wire page of the Preferencesdialog.

A T-junction in a wire is automatically connected by a junction (Compiler-Generated Junction). If the Break Wires At Autojunctions option is enabled on the Schematic - General page of the Preferencesdialog, an existing wire segment will be broken into two at the point where an autojunction is inserted. For example, when making a T-Junction, the perpendicular wire segment will be broken into two segments, one on each side of the junction. With the Break Wires At Autojunctions option disabled, the wire segment will remain unbroken at the junction.

A junction is an electrical design primitive. It is a small circular object used to join intersecting wires (or buses, or signal harnesses) on a schematic sheet. A Compiler generated junction is a junction that is automatically placed by the Auto-junctioning feature when two wires/buses/signal harnesses are connected in a T-type fashion, or when a wire/bus/signal harness connects orthogonally to a pin, power port or other electrical object.

This type of junction is placed automatically by the Schematic Editor"s Auto-junctioning feature. As such, it is not a design object that can be accessed and placed by the user.

If the Break Wires At Autojunctions option is enabled, on the Schematic - General page of the Preferencesdialog, an existing wire/bus/signal harness segment will be broken into two at the point where an autojunction is inserted. For example, when making a T-Junction, the perpendicular wire/bus/signal harness segment will be broken into two segments, one each side of the junction. With this option disabled, the wire/bus/signal harness segment will remain unbroken at the junction.

A Compiler generated junction cannot be edited in the usual manner (via a dialog or graphically on the schematic sheet). The display properties of compiler generated junctions are configured on the Schematic - Compiler page of the Preferences dialog, as shown in the image below. Note that disabling the display of compiler generated junctions does not break the electrical connection at that junction point.

This feature requires the Display When Dragging option to be enabled in the Auto-Junctions region on the Schematic - Compiler page of the Preferencesdialog.

You can quickly convert a 4-way junction (created with wire or bus objects), into two adjacent 3-way junctions. To do this, select the Tools » Convert » Convert Cross Junctions command from the main menus. After launching the command, the Junctions Conversion dialog will appear. Use this dialog to determine the scope of the conversion (current document, project documents, or all open schematic documents), and whether all potential 4-way junctions are considered, or only those associated to selected wires/busses in the target documents. Once conversion options are configured as desired, clicking OKin the dialog will effect conversion.

If the design does not fit onto a single schematic sheet, it can be spread over multiple sheets. There are two distinct models for organizing and creating connectivity in a multi-sheet schematic: either as a flat design, which you can think of as one large schematic sheet that has been cut up into a number of smaller sheets; or as a hierarchical design, where the sheets are linked in a grandparent-parent-child type structure.

A design is referred to as a flat design when the connectivity is created directly from one sheet to another sheet. It does not pass through Sheet Symbols on the parent sheet. In a flat design, the sheet symbols simply represent (and reference) the child sheets. All sheets in the design appear at the same level in the Projects panel because there is no hierarchy. Both of the images below show a flat design.

Flat designs are simpler to create. A flat design can include a top sheet with a Sheet Symbol for each child sheet, but this is optional since this top sheet is not used to create sheet-to-sheet connectivity. For a small design that only has two or three schematic sheets in it, you might decide that a top sheet does not add any value. Once the sheet count gets higher, a top sheet can help the reader understand the functionality of the circuit design from the way that the logical blocks (Sheet Symbols) are arranged on the sheet.

The first is the ability to show the reader the functionality of the design in the way that the schematic sheets have been structured and presented as logical blocks (Sheet Symbols). The top-level schematic presents the design as a set of high-level functional blocks with the arrangement of the blocks reflecting their place in the traditional left-to-right, input-to-output flow of the overall circuit. These blocks can be further broken down into smaller blocks. if required, allowing the lowest level schematics that carry the components to have a relatively simple structure with a low component count. Because each sheet is relatively simple, the measured sheet size can be kept small, which is a big advantage when it comes to printing the schematic.

It is not unusual for an electronic design to include repeated sections of circuitry. It might be a stereo amplifier or a 64-channel mixing desk. This type of design is fully supported by a feature set known as multi-channel design. In a multi-channel design, you capture the repeated circuit once then instruct the software to repeat it by either placing multiple Sheet Symbols that all reference the same child schematic, or by configuring a single Sheet Symbol to repeat the referenced child schematic the required number of times. The compiled design is expanded out in the computer"s memory with all components and connectivity repeated the required number of times in accordance with the user-defined naming scheme.

The logical design that you capture is never actually flattened; it always remains as a multi-channel schematic. When you transfer it to PCB layout the physical components and nets are stepped out the required number of times, and you have full access to the cross-probing and cross-selecting tools available for Working Between the Schematic and the Board. There is also a tool in the PCB editor to replicate the placement and routing of one channel across all other channels, with the ability to easily move and reorient an entire channel. Refer to the multi-channel design document to learn more about multi-channel design.

The software uses the current setting of the Net Identifier Scope to work out how to establish connectivity between the schematic sheets. The Net Identifier Scope is configured in the Options tab of the Project Options dialog (Project » Project Options).

Each time you place a wire between component pins, you are creating connectivity. Every net in the design is given a name. If you have not placed a net identifier that can be used to name the net, the software names that net based on one of the pins in the net, for example, NetR7_1 as shown in the image below. If the component designator is changed at some stage, that system-generated net name is also changed and these changes must be passed between the schematic and PCB to keep everything in sync.

You cannot have multiple Net Labels with different names on the same net within a schematic sheet. This situation will be detected and flagged as an error during validation. However, it is legitimate to have multiple net identifiers on a net on different sheets on which the net appears.

Suppress specific warnings by placing a No ERC Marker on each warning then choosing Specific Violations on the No ERC mode of the Propertiespanel to define the errors to suppress. Note that No ERC markers can be placed by right-clicking on a warning listed in the Messages panel or by right-clicking on the wavy colored line marking a violation on the schematic sheet. Their shape and color can be changed in the Properties panel when the No ERC marker is selected.

A good approach to setting these options is to enable the Allow Ports to Name Nets and the Higher Level Names Take Priority options. Combine these with sensible usage of Net Labels on significant nets on each sheet to ensure that all of the important nets, including those that traverse sheets, are named, and that the names assigned on the higher-level schematics are used on the lower-level schematics.

Another net naming issue that can arise is when the same net name has been used on different schematic sheets to label different nets. This will be detected during validation by the Duplicate Nets error check. You cannot transfer a design to the PCB with this condition present. Those two separate nets will be merged into a single PCB net during design transfer.

The Append Sheet Numbers to Local Nets option will work only if each schematic sheet has been assigned a unique SheetNumber. The SheetNumber parameter is assigned on the Parameters tab of the Document Options mode of the Properties panel for each schematic sheet. As an alternative to manually assigning a unique number to each schematic sheet, run the Tools » Annotation » Number Schematic Sheets command, which opens the Sheet Numbering for Project dialog. This dialog can be used to assign unique SheetNumbers (a simple numeric value for each sheet) and DocumentNumbers (typically used for company-assigned document numbering) to all sheets.

This is achieved by connecting the two nets through a Net Tie component. A Net Tie component is nothing more than a controlled short circuit, allowing you to decide the location on the board where the nets connect. On the schematic, the Net Tie component has two or more pins, with each pin connected to one of the nets to be shorted. The Component Type property of the component is set to Net Tie, as shown below.

Note that the pins are not wired to each other on the schematic (they are not shorted on the schematic), but they are connected together within the PCB footprint.

On the PCB side, the footprint has the same number of pads as the schematic symbol has pins with copper between them. In the example image below, this is achieved by connecting two square pads with a length of track. This is done within the footprint in the PCB library editor. The PCB Component Type property is also set to Net Tie.

The default behavior of the settings is to assume that power nets are global, i.e. you want them to be available on every schematic sheet. To access a power net, place a Power Port with the required net name then wire the components to that power port.

As mentioned previously, power nets can be localized to each schematic sheet in a hierarchical design by selecting the Strict Hierarchical option for the Net Identifier Scope. This approach localizes all power nets on every sheet, so they must be manually wired together, using the same approach as signal nets. If they are not wired together, there will be a Duplicate Net Name error for each power net present on each schematic sheet. You will also need to adjust the Connection Matrix settings to allow Ports to be connected to Power Ports.

Older versions of Altium"s design software included features and options to support the use of hidden schematic component pins. This feature was useful when a design had a single power net and a single ground net, allowing all the power pins on all devices to be automatically connected to their respective nets by hiding those power pins. It was most popular on multi-part components, freeing you from having to display the power pins for these components on the schematic.

In order to check for logical, electrical, and drafting errors between the DDM and compiler settings, you must validate the project. This command is accessed by choosing the Project » Validate Projectcommand from the main menus or by right-clicking over the entry for a project in the Projects panel, and choosing theValidate Project command from the context menu.

Any violations that are detected by the Compiler will be listed as warnings and/or errors in the Messages panel. The Compiler uses the options defined on the Error Reporting and Connection Matrix tabs of the Project Options dialog (as applicable to the project type), when checking the source documents for violations.

A fundamental element of the software is the Unified Data Model (UDM). Data within the model can be accessed and manipulated by the various editors and services within the software including the schematic and the PCB. Rather than using a separate data store for each of the various design domains, the UDM is structured to accommodate all information from all aspects of the design, including the components and their connectivity. This single, cohesive model that sits central to the design process is created as a result of dynamic design compilation. It means that the Unified Data Model is available from the moment a project is opened and should not require additional manual compilation – a true Dynamic Data Model (DDM). Therefore, the model is incrementally updated (compiled) after each user operation. You can freely place, wire, rearrange, rename, add, and delete content from your schematic design.

The PCB design compilation process is managed by code outside of the schematic and PCB editors. There are a number of advantages to this approach, with the biggest being that the Unified Data Model of the design sits outside of the individual schematic and PCB editors. The UDM includes detailed descriptions of every component in the design and how they connect to each other.

To automatically refresh the project view and Navigator panel after dynamic compilation, enable the Schematic.DynamicCompiler.Navigator.Autorefresh option in the Advanced Settings dialog (accessed by clicking Advanced on the System – General page of the Preferences dialog.

If the design is large and spread over many sheets, it can become difficult to follow and verify the connectivity in the design. To help with this process, you can use the Navigator panel is used. The panel gives a view of the entire, compiled design.

Click on a component or net in the Navigator panel to locate that component or net, and trace the connectivity through the design. Right-click to access display options. Hover the cursor over the image to show navigating to a component on the schematic and the PCB simultaneously (hold Alt as you click in the Navigator panel to include the PCB object).

As well as locating components on the schematic and the PCB (if Alt is held) from the Navigator panel, you can also navigate pins/components/nets/buses/harnesses on the PCB, directly from the schematic.

As well as being able to select from one editor to the other (cross selection), the software also supports Cross Probing. Cross Probing has two modes, continuous (remain in the source editor) and jump-to (jump to the target editor). You can also cross probe from various panels and dialogs, for example, the Messages panel and the Engineering Change Order dialog. To learn more, refer to the Cross Probing and Selecting page.

To help make the schematic more readable and make it easier to work with nets and routes in the PCB editor, color can be applied to schematic wiring, and the PCB nets and routes.

A highlight color can be applied to a net or a bus in the schematic editor using the commands in the View » Set Net Colors sub-menu, as shown in the image below. These colors can be transferred to the PCB editor at any time, via the Update PCB command.

In the PCB editor, the default color and visibility of the Connection Lines is configured in the System Colors section of the PCB View Configuration panel. Note that this default color is applied when the nets are created (during initial design transfer from schematic), the color of existing connection lines will not change if this option is changed.

In the PCB editor, the color applied to each net is displayed in the Nets mode of the PCB panel. Look for the color behind the checkbox next to the net name, as shown in the bottom right corner of the image below.

The color is always applied to the unrouted nets (connection lines). To display the color on the routed nets, enable the checkbox next to the net name in the PCB panel, and configure the display options in the Board Insight Color Overrides page of the Preferences dialog. In the image below, the override color Base Pattern is set to Solid, and the Zoom Out Behavior is set to Override Color Dominates.

Press F5 to toggle the Net Color Override feature on / off, in both the schematic and PCB editors. You may need to also perform a screen refresh (End).

It is not always possible to apply color to the schematic wiring and transfer it to the PCB. In this situation, color can still be applied to connection lines and routing in the PCB editor. To change the color of a net after the design has been transferred, double click on the net name in the Nets mode of the PCB panel. The color of an individual net can be edited in the Edit Net dialog.