Regular/conventional Panel (Row/Gate drivers and Driver Column)

Conventional LCD Viewer consists of a panel of liquid crystal matrix, row drivers (often called ear, because the shape of COF or embedded) and column drivers (often erroneously called COF). Matrix/cell area of the LCD in the illustration given pink/magenta. Row driver produces a signal ON/OFF for each row of the matrix (the signal Gate ON/OFF). While the column drivers generate signals/color for each column of the matrix. Here is a simple chart of the conventional panel:

Row driver form IC (Chip-on-Film, the COF) which is located next to the matrix and the outputs are directly connected with each row of the matrix (with foot GATE fet drivers of Crystal in matrix). While the column driver also be IC (Chip-on-Film, the COF) located at the top/bottom of matric and outputs connected directly with each column of the matrix (foot Source fet movers Crystal in matrix).

The data columns of the TCON is sent to the column drivers in cascade for the matrix with column driver more than 1. In its technical, TCON will fill the data column the first driver, when it is full, then the column data will tell the driver the first column the next driver through COL_FLAG_OUT and so on until all the column property set/driver loaded.

Data line of the TCON is sent to row/gate driver in cascade for the matrix row drivers more than 1. In its technical, TCON will fill the data row drivers first, then the row is already full when drivers first will tell the driver the next row through ROW_FLAG_OUT and so on until all of the row set driver/filled.

LVDATA required for transmission signal CLOCK signals and STATES/control. Data sent can be either serial or parallel. In the kontroller lcd panel, often found in the form of LVDATA RGB parallel to the column. While the data lines are often found in the form of the series (due to the location of the row drivers are on the side of the matrix so that the area is very limited). Serial data transmission requires signals CLOCK (CKV), SET/RST/STV, OE and DATA. Sometimes there is antecedent data mixed with signals CKV. Row in the matrix are assembled vertically, meaning if all row driver is fully charged, then the data will be deleted, and then filled again from the first line again and so on. Once all the rows of data charging period is often called also time STV or start Vertical (one time period pulse STV).

Large voltage gate is approaching or equal to VGL when conditions OFF and approaching or equal to VGH when conditions ON. So row drivers need voltage VGH/VON and VOFF VGL/to move the gate. Therefore the voltage VGL and VGH is inserted directly into the Row Driver.

VCOM voltage or supply voltage is the shared source matrix. VCOM voltage is DC. This voltage is inserted directly into the matrix via the column drivers. Because these voltages are used together in one group matrix, then the brightness can be set by setting the voltage large matrix.
To facilitate clustering of cells, the cell area divided by the sum of the number of COF installed. For example, a panel with 4 COF column drivers, means in a column of the screen is divided into four parts. So when there is 1 COF doesn't work (broken/dead) then it will be a quarter-section column blank screen. So also with the COF row/gate drivers.

Types of in-Plane Panel

When compared with other types of conventional panels on the top, there is a clear difference on the configuration row drivers (or gate driver). The shortage of conventional panels is wearing the IC type of COF for row driver that could cause a failure of the contact corrosion, easy to work and more. These deficiencies in terms of the manufacturers will raise production costs. To cover this shortfall, manufacturers make ic row driver directly so one panel and created simultaneously when panel/matrix created (IC row/gate drivers made stick and in the glass panel). Because it is made into one with a screen, then often referred to as the technology of in-plane. Beriring with this technology, also developed improved image quality with how to change the form of lcd cell in order to display more wide angle (the cells are made conical, not flat like the previous cells). Here is a picture of a simple block panel in-Plane (with a set of CKV, CKVB only):

Insert the VGH voltage directly to the IC row/gate drivers that are planted in the panel are highly risky and have a high failure, due to the size and specifications of the IC are made very small. To resolve it, a single system clock and data voltage processing its own VGH and VGL will be sent into the ic row/gate drivers inside panel.

Block voltage processor VGH and VGL into data and data clock gate is called Gate Clock Generator, which generates the signals/pulses STVP (start vertical sync), CKV (clock), CKVB (clock bar or row of data) and VSS (minus, slightly larger than the VGL, about-7V5). Signal-signal from the generator it really should be synchronized with the image that will be displayed.

IC that doubles as a clock gate generators often encountered is separated from the power supply have also become one with the ic power supply panel for example BD8193 (the Samsung brand panel).
Because the signal level of the gate clock generator voltage under VON/VOFF to normal cells, then a single row/gate driver IC that flanked the matrix, is on the right and dikiri matrix. The goal is not so other cells can be perfect ON and OFF because in parallel gate disupply of the right and left of the screen.

Often found some in-Plane panel using more than 1 set of clock and data signal gate. For example wear 3 pairs CKV & CKVB (CKV1, CKV2, CKV3, CKVB1, CKVB2, CKVB3). On the clock and data line, every single gate/gate get drives from 1 row/gate driver ic. Whereas on 3 pairs of clock and data of the gate using the 3 row/gate driver ic (meaning 3 ic on the right and 3 left panel in the ic). The first IC drived gate/line 1, 4, 7, 10, 13, etc. The second IC will drived line 2, 5, 8, 11, 14, etc. And the third will be drived IC lines 3, 6, 9, 12, 15, etc. The sixth driver ic gate work this really need to be synchronized.

When full screen is already envisaged, then signal the STVP will remove the screen and started scanning pictures/new. STVP is voltage pulse of about minus-11V, it takes a high level because the STVP is also used to clear full screen scanning each period.

The photo above is of type panel damage in-Plane, when one row/gate driver ic in the panel short damage, then the data in the gate driver ic will be disturbed. For example the output gate driver must filling line to 10 will switch to other drived/filling line. Short between the lines due to corrosion or because the moist can also result in disruption of data output gate driver. There are 2 blocks ic gate drivers that are in the right and left of the panel, it is possible only one ic gate drivers are corrupted.

Regular/conventional Panel (Row/Gate drivers and Driver Column) 2016-04-30T20:36:00-07:00 Rating: 4.5 Diposkan Oleh: Unknown