JP4815615B2 - Source line driving method, buffer circuit, driving system, driving method, display device, and source line driver circuit - Google Patents

Description

  The present invention relates to a source driver that drives a panel of a liquid crystal display (LCD), and more particularly, to a source driver and method that can reduce current consumption.

  There are a gate driver and a source driver as drivers for driving the LCD panel. The gate driver sequentially activates the gate lines of the panel one by one. The source driver transmits data to a cell connected to the activated gate line.

  FIG. 1 is a diagram illustrating the structure of a general source driver.

  Hue data representing the hue of a panel (not shown) is composed of three channel data: R channel data DATA_R, G channel data DATA_G, and B channel data DATA_B. If three channel data DATA_R, DATA_G, and DATA_B are applied to a cell of a panel (not shown), the cell represents one hue.

  The decoding unit DR receives the R channel data DATA_R and generates a corresponding R voltage signal R_VOL. The R voltage signal R_VOL is buffered by the R buffer R_BUF and output. The output terminal RBON and the R output terminal ROUT of the R buffer R_BUF are connected or disconnected by a switch R_SW controlled by the connection control signal R_CONCON.

  If the switch R_SW is connected, the R voltage signal R_VOL is applied to the corresponding cell of the panel (not shown).

  The decoding unit DG receives the G channel data DATA_G and generates a corresponding G voltage signal G_VOL. The G voltage signal G_VOL is buffered by the G buffer G_BUF and output. The output terminal GBON and the G output terminal GOUT of the G buffer G_BUF are connected or disconnected by a switch G_SW controlled by a connection control signal G_CONN.

  If the switch G_SW is connected, the G voltage signal G_VOL is applied to the corresponding cell of the panel (not shown).

  Similarly, the decoding unit DB receives the B channel data DATA_B and generates a corresponding B voltage signal B_VOL. The B voltage signal B_VOL is buffered by the B buffer B_BUF and output. The output terminal BBON and the B output terminal BOUT of the B buffer B_BUF are connected or disconnected by a switch B_SW controlled by a connection control signal B_CONCON.

  If the switch B_SW is connected, the B voltage signal B_VOL is applied to the corresponding cell of the panel (not shown).

  The R voltage signal R_VOL, the G voltage signal G_VOL, and the B voltage signal B_VOL are configured to be applied to the same cell so that the cell represents a hue. As shown in FIG. 1, the source driver 100 includes a decoder DR, DG, DB corresponding to channel data DATA_R, DATA_G, DATA_B, buffers R_BUF, G_BUF, B_BUF, and switches R_SW, G_SW, B_SW in a panel (not shown) cell. There are as many numbers as there are numbers.

  A decoding unit DR, an R buffer R_BUF, and a switch R_SW that receive one channel data, for example, R channel data DATA_R and apply it to a corresponding cell are called channels. Therefore, three channels are required for one cell to be configured to represent hue.

  FIG. 2 is a diagram illustrating a conventional source driver structure including a selection switch.

  For testing purposes, only one of the buffers 10 and 20 is selectively connected to the decoder by the selection switches GRAY_ON and CH_MUX30. Also, the buffers 10 and 20 can be disabled by an AMP_ON / OFF signal for testing purposes.

  The selection switches GRAY_ON and CH_MUX 30 are used to test two channels simultaneously. During the test operation, the number of necessary test pins can be reduced by half by connecting the selection switches GRAY_ON and CH_MUX30 and simultaneously testing two channels.

A technical problem to be solved by the present invention is to provide a source line driver circuit, a buffer circuit, a display device, and a driving system that can reduce current consumption when received channel data or hue data is the same. That is.

Another technical problem to be solved by the present invention is to provide a source line driving method and a driving method that can reduce current consumption when received channel data or hue data is the same.

According to an embodiment of the present invention, there is provided a source line driving method according to an embodiment of the present invention. Comparing the second hue data for driving the second buffer connected to the line, and if the comparison result between the first hue data and the second hue data is the same, the first buffer Using to selectively drive the second source line ,
If the comparison result between the first hue data and the second hue data is the same, the second buffer is selectively disabled.

  The first hue data and the second hue data include R channel data, G channel data, and B channel data provided to the first and second source lines, respectively.

The first hue data includes one of R channel data, G channel data, and B channel data, and the second hue data includes the first hue data of R channel data, G channel data, and B channel data. corresponding comprise one channel data to the first source line and the second source line is the source lines corresponding one of the source lines connected to two different pixels.

  The first hue data includes one of R channel data, G channel data, and B channel data, and the second hue data includes another one of R channel data, G channel data, and B channel data. Including. The comparing step determines whether the first hue data and the second hue data have the same value.

  The first and second hue data includes RGB data for two different pixels, the first buffer includes a first R buffer, a first G buffer, and a first B buffer, and the second buffer includes a second R buffer. A buffer, a second G buffer, and a second B buffer.

  The step of selectively disabling the second buffer selects connection between the second buffer and the second source line when the first buffer drives the first source line and the second source line. Separate.

  The step of selectively disabling the second buffer selectively disables the differential amplification input circuit and / or the output drive circuit of the second buffer. The first source line and the second source line are source lines of the same pixel. The first source line and the second source line are source lines of different pixels.

  The first hue data and the second hue data include R channel data, G channel data, B channel data and / or white data provided to the first and second source lines, respectively. The display device is an LCD.

  First hue data for driving a first buffer connected to a first source line of a display device and second hue data for driving a second buffer connected to a second source line of the display device. In the comparing, the first color data for driving the plurality of first buffers connected to the plurality of first source lines and the plurality of second buffers connected to the plurality of second source lines are used. Comparing with second hue data for driving.

If the second buffer is selectively disabled and the comparison result between the first hue data and the second hue data is the same, the second source line is selectively driven using the first buffer. The step of selectively disabling the plurality of second buffers and using the plurality of first buffers if the comparison result between the first hue data and the second hue data is the same. Selectively driving the plurality of second source lines.

According to another aspect of the present invention, there is provided a source line driving method for driving hue data for driving a first source line of a display device and at least one other source line of the display device. comparing a hue data for, if said comparison result is the same, the steps of selectively driving the result the common source line buffers in at least one other source lines and said first source line, wherein Deactivating the source line buffer of the at least one other source line if at least one other source line is driven by the common source line buffer.

  The step of comparing the hue data includes comparing the hue data for driving the first source line of the display device with the hue data for driving each of the plurality of other source lines of the display device. including.

If the comparison result is the same, the step of selectively driving the result the common source line buffers in at least one other source lines and said first source line, the first source line and the common source line buffer Driving a selected line of the plurality of other source lines.

  The step of deactivating the source line buffer deactivates the source line buffer for each of the plurality of source lines driven by the common source line buffer.

  The step of deactivating the source line buffer selectively disables the differential amplification input circuit and / or the output drive circuit of the source line buffer.

  The first source line and the at least one other source line are source lines provided with the same color component for at least two different pixels. The first source line and the at least one other source line are source lines provided with different color components.

  The first source line includes a plurality of first source lines, and the at least one other source line includes a plurality of second source lines for driving the first source line of the display apparatus. The step of comparing the hue data with the hue data for driving at least one other source line of the display device includes the step of comparing the hue data for driving the plurality of first source lines of the display device and the display. Comparing the hue data for driving the plurality of second source lines of the apparatus.

If the comparison result is the same, the step of selectively driving the result the common source line buffers in at least one other source lines and said first source line, if the comparison result is the same, a plurality of the common source line buffers Therefore comprising the step of selectively driving the plurality of first source lines and said plurality of second source lines.

  If the at least one other source line is driven by the common source line buffer, the step of deactivating the source line buffer of the at least one other source line may be performed by the plurality of second source lines. If driven by a plurality of common source line buffers, the method includes deactivating the source line buffers of the plurality of second source lines.

  A buffer circuit for driving a source line of a display apparatus according to another embodiment of the present invention for solving the above-described problem includes a data comparison circuit, a first buffer, a second buffer, and a first switching circuit.

  The data comparison circuit compares the first hue data value provided to the first source line of the display device and the second hue data value provided to the second source line. The first buffer drives the first source line based on the first hue data value.

The second buffer is a second buffer for driving the second source line based on the second color data value, the second buffer, the second if the comparison result is identical with the data comparison circuit Selectively disable two buffers. The first switching circuit, the comparison result by the data comparing circuit is electrically selectively connected to the second source line said first buffer if the same.

The data comparison circuit determines whether or not the first hue data and the second hue data have the same value. The first hue data and the second hue data include RGB data for two different pixels of the display device, and the first buffer includes a first red buffer for driving a first red source line, a first A first green buffer for driving the green source line and a first blue buffer for driving the first blue source line are provided.

Said second buffer, said comparison result by the data comparing circuit is selectively disabled when the same, a second red buffer for driving the second red source lines, the data comparison result of the comparison by the circuit are the same it is selectively disabled if, second green buffer for driving the second green source line, wherein the data comparison result of the comparison by the circuit is selectively disabled when the same is driving the second blue source lines A second blue buffer is provided.

Said first switching circuit, the data comparison result of the comparison by the circuit selectively electrically connected to the second red source line the first red buffer if the same result compared by said data comparing circuit selectively electrically connected, said data comparator circuit the first if the comparison result is identical with the blue the buffer second blue but the first green buffer if the same in the second green source line Selectively electrically connect to the source line.

If the comparison result is identical with the data comparison circuit, wherein the connection between the second buffer and said second source line solved electrically Optionally, said first buffer is connected to the second source line And a second switching circuit for uncoupling the second buffers.

  The data comparison circuit includes a plurality of logic gates for comparing data bits corresponding to the first and second hue data values, and if the outputs of the plurality of logic gates have the same value, A summing logic gate for summing outputs of logic gates and outputting a first signal; and a plurality of multiplexers for selectively providing control signals to the first and second switching circuits based on the outputs of the summing logic gates. .

  The plurality of multiplexers include a plurality of exclusive ORs (XOR) gates, and the summing logic gate includes an NOR (Negative OR) gate. The summing logic gate includes a plurality of logic gates.

  The plurality of multiplexers includes a first multiplexer that generates a control signal for controlling the operation of the second buffer, and a control signal for controlling the operation of the first switching circuit that connects the first buffer to the second source line. And a third multiplexer for generating a control signal for controlling the operation of the second switching circuit for separating the second buffer from the second source line.

  The second buffer includes an input circuit that selectively isolates the transistor from the voltage source when the second buffer is disabled. The output circuit further controls an output drive transistor of an output circuit that separates an output line of the second buffer from an output voltage source of the second buffer.

  A system for driving a source line of a display apparatus according to an embodiment of the present invention to solve the above-described problems includes a comparison unit and a driving unit.

The comparison means may include a first hue data for driving a first buffer connected to the first source line of the display device and a second for driving a second buffer connected to the second source line of the display device. Compare with hue data.
Driving means, comparison result by said comparing means selectively driving said second source line with the first buffer if the same.

  Means for selectively disabling the second buffer in response to the comparing means; The comparison means includes means for determining whether or not the first hue data and the second hue data have the same value.

  A system for driving a source line of a display apparatus according to an embodiment of the present invention for solving the above-described problem includes a comparison unit, a driving unit, and a deactivation unit.

  The comparison means compares the hue data for driving the first source line of the display apparatus with the hue data for driving at least one other source line of the display apparatus.

Driving means, comparison result by said comparison means for selectively driving the common source line buffers Thus the at least one other source line and the first source line if the same. The deactivating means deactivates the source line buffer of the at least one other source line when the at least one other source line is driven by the common source line buffer.

  The comparing means includes means for comparing the hue data for driving the first source line of the display device with the hue data for driving each of the plurality of other source lines of the display device.

If the comparison result is the same, the means for selectively driving the at least one other source line and the first source line to the common source line buffer includes the first source line and the common source line buffer to the Means for driving a selected line among a plurality of other source lines is provided.

  The means for deactivating the source line buffer comprises means for deactivating a source line buffer for each of the plurality of source lines driven by the common source line buffer.

A system for driving first and second source lines of a display panel according to an embodiment of the present invention to solve the above-described problems is provided with a display driven by first and second buffer amplifiers and the first and second source lines. If the data values are the same, a means for selecting one of the first and second buffer amplifiers driving the second source line is provided.

  And means for disabling the second buffer amplifier if the first buffer amplifier is selected to drive the second source line. The first and second source lines are for the same pixel of the display device.

  The means for selecting one of the first and second buffer amplifiers for driving the second source line based on a value of display data driven by the first and second source lines may include the first and second buffer amplifiers. If the display data values driven by the second source line are the same as each other, the means for selecting the first buffer amplifier to drive the second source line and the first and second source lines are driven. Means for selecting the second buffer amplifier to drive the second source line if the values of the display data differ.

If it is selected for the first buffer amplifier is driving the second source line, said a thus means for driving said second source line in the first buffer amplifier, said second buffer amplifier and the second source line if the selected for driving, further comprising, means for driving said in the second buffer amplifier Therefore the second source line.

According to an embodiment of the present invention, there is provided a display device, a display panel, a data comparison circuit for comparing display data values, receiving the display data, and a display device source based on the received display data. If a plurality of source line drivers for driving a line and the comparison result of the display data values are the same, the different source lines of the display device may be selectively connected to each of the plurality of source line drivers. A data comparison circuit and a source line switching network responsive to the plurality of source line drivers ,
The plurality of source line drivers respond to the data comparison circuit to selectively deactivate each of the plurality of source line drivers if the comparison result of the display data values is the same; It is characterized by.

  The source line switching network separates an inactivated one of the plurality of source line drivers from the source line of the display device. If the data comparison circuit determines that the display data values corresponding to two source lines are the same, the source line switching network connects one source line driver to the two source lines of the display device.

  According to another embodiment of the present invention, there is provided a source line driver circuit comprising: a buffer circuit for receiving hue data and controlling a hue of a corresponding panel cell; Is provided.

  At least one first source line driver circuit receives the first hue data and controls the hue of the corresponding cell. At least one second source line driver circuit receives the second hue data and controls the hue of the corresponding cell.

  The at least one first source line driver circuit includes first to nth buffers therein, and the at least one second source line driver circuit includes n + 1th to second n buffers therein.

  If the first hue data and the second hue data are the same, some buffer amplifiers of the first to second n buffers are turned on, the remaining buffer amplifiers are turned off, and the turned-on buffers are turned on. The amplifier simultaneously controls the hues of cells corresponding to the first source line driver circuit and the second source line driver circuit.

  The source line driver circuit and the method for reducing the current consumption of the source line driver circuit according to the present invention can reduce the current consumption when the hue data applied to the source driver is the same or the channel data is the same.

  For a full understanding of the present invention, its operational advantages, and the objects solved by the practice of the present invention, reference is made to the accompanying drawings that illustrate preferred embodiments of the invention and the contents described in the drawings. There must be.

  Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. The same reference numbers provided in each drawing represent similar components.

  FIG. 3 is a diagram illustrating a block diagram according to an embodiment of the present invention.

  Referring to FIG. 3, the display device 50 receives a display panel 60, a data comparison circuit 90 that compares display data values, receives display data, and drives a source line of the display panel 60 based on the received display data. In order to selectively connect the other source lines of the display device 50 and the plurality of source line drivers 70 based on the comparison results of the plurality of source line drivers 70 and the display data values, A source line switching network 80 responsive to the source line drivers 70 is provided.

  The plurality of source line drivers 70 respond to the data comparison circuit 90 to selectively inactivate each of the plurality of source line drivers 70 based on the display data value comparison result. The source line switching network 80 separates the deactivated source line drivers 70 from the source lines of the display panel 60.

  The source line switching network 80 connects one source line driver to the two or more source lines if the data comparison circuit 90 has the same display data value corresponding to the two or more source lines. To do.

  Display data comparison compares the data values of two or more source lines, and if the data values are the same, drives the two or more source lines to a common buffer amplifier of the source line driver 70. .

  The resolution of the comparison data can be pixels or subpixels. For example, the comparison is performed between data for two source lines, and the two source lines are driven by one buffer amplifier.

  Regardless of whether the source line is driven by one buffer amplifier or by two separate buffer amplifiers, as long as the source line is driven based on the result of the data comparison in the same display, it is compared. Regardless of the importance of the data values, the two values can be compared.

  For example, two data values correspond to the same color component value displayed for two different pixels, correspond to different color component values displayed for the same or different pixels, or for each color component Corresponds to a bond.

  Regardless of the resolution of the data values being compared, the resolution that controls the driving of the source line must be the same. Thus, for example, if the control for driving the source line is at the pixel level, the data comparison must also be at the pixel level. Similarly, if the control for driving the source line is a color component or channel level, the data comparison must also be a color component or channel level.

  The particular structure of source line driver 70, source line switching network 80, and data comparison circuit 90 depends on the complexity that can be accommodated for the desired control resolution and application. The source line switching network 80 may be any circuit structure that selectively couples the buffer amplifier to the source line.

  Therefore, the circuit structure according to the embodiment of the present invention is not limited to the one described below, and is a structure in which the source line driver is connected to the source line based on the comparison value of the data provided to the source line. Any structure that can be activated. Hereinafter, embodiments of the present invention will be described with reference to FIGS.

  FIG. 4 is a block diagram illustrating a part of a source line driver circuit according to an embodiment of the present invention.

  Referring to FIG. 4, the source line driver circuit 200 includes a first source line driver circuit 210 for the first pixel and a second source line driver circuit 220 for the second pixel.

  The data comparison circuit 230 receives RGB data for two pixels in two columns of pixels of the display panel driven by the first and second source line driver circuits 210 and 220, and selectively selects the first and second data lines. A common control signal for controlling the operation of the two source line driver circuits 210 and 220 is received.

  The data comparison circuit 230 generates individual control signals for controlling the first and second source line driver circuits 210 and 220 using the received RGB data and the common control signal.

  The RGB data input to the data comparison circuit 230 is 18-bit data DATA_RGB1 and DATA_RGB2, which are 6-bit first R channel data DATA_R1, first G channel data DATA_G1, first B channel data DATA_B1, second R channel data DATA_R2, The second G channel data DATA_G2 and the second B channel data DATA_B2 are provided to the decoding units DR1, DG1, DB1, DR2, DG2, and D2 of the first and second source line driver circuits 210 and 220, respectively.

  The decoding units DR1, DG1, DB1, DR2, DG2, DB2 convert the RGB data into analog values R_VOL1, G_VOL1, B_VOL1, R_VOL2, G_VOL2, B_VOL2, and corresponding buffer amplifiers R_BUF1, G_BUF1, B_BUF1, R_BUF2, G_BUF2 , B_BUF2.

  Buffer amplifiers R_BUF1, G_BUF1, B_BUF1, R_BUF2, G_BUF2, and B_BUF2 are selectively deactivated by control signals OPCON1 and OPCON2. The outputs RBON1, GBON1, BBON1, RBON2, GBON2, BBON2 of the buffer amplifiers R_BUF1, G_BUF1, B_BUF1, R_BUF2, G_BUF2, B_BUF2 are separated and controlled by two switch sets R_SW1, G_SW1, B_SW1, R_SW2, G_SW2, B The first and second source line driver circuits 210 and 220 are connected to corresponding output lines ROUT1, GOUT1, BOUT1, ROUT2, GOUT2, and BOUT2.

  The switch sets R_SW1, G_SW1, and B_SW1 are controlled in response to the control signal COCON1, and the switch sets R_SW2, G_SW2, and B_SW2 are controlled in response to the control signal COCON2.

  The outputs RBON1, GBON1, BBON1 of the buffer amplifiers R_BUF1, G_BUF1, B_BUF1 are selectively connected to the output lines ROUT2, GOUT2, BOUT2 by the switches SSW1, SSW2, SSW3. The switches SSW1, SSW2, and SSW3 are controlled by a control signal SEL_CON.

  The OPS, COS, and SELS signals may be global selection and control signals used to generate pixel level control signals OPCON1, OPCON2, COCON1, COCON2, and SEL_CON.

  By performing an OR operation on the OPS, COS, and SELS signals and the pixel level control signals OPCON1, OPCON2, COCON1, COCON2, and SEL_CON generated from the data comparison circuit 230, the OPS, COS, and SELS signals pass through the data comparison circuit 230. Thus, it can operate as a test mode signal applied to the source line driver circuits 210 and 220.

  A test device having a reduced pin count in this manner can be used with embodiments of the present invention.

  If the 18-bit RGB data DATA_RGB1 and DATA_RGB2 are the same, the buffer amplifiers R_BUF2, G_BUF2, B_BUF2 of the second source line driver circuit 220 are disabled, and the data comparison circuit 230 uses the first source line driver circuit 210. The output lines ROUT1, GOUT1, BOUT1, ROUT2, GOUT2, and BOUT2 are controlled.

  That is, the buffer amplifiers R_BUF1, G_BUF1, and B_BUF1 operate as a common buffer amplifier that drives two sets of source lines based on the data comparison result. Specifically, Table 1 below explains the state of the control signal based on the data comparison result.

In Table 1 above, the activation signal means the connection of the corresponding switch or the activation of the buffer amplifier. That is, for example, if the OPCON2 signal is active, the buffer amplifiers R_BUF2, G_BUF2, B_BUF2 are activated, and if the OPCON2 signal is inactive, the buffer amplifiers R_BUF2, G_BUF2, B_BUF2 are inactivated. Similarly, when the SEL_CON signal is activated, the switches SSW1, SSW2, and SSW3 are connected, and when the SEL_CON signal is deactivated, the switches SSW1, SSW2, and SSW3 are separated.
FIG. 4 shows that the data comparison is performed at the pixel level, so if two pixels have the same value, the buffer amplifier connected to one pixel is disabled and the source line of the two pixels is Represents being driven by a buffer amplifier of a pixel.

  FIG. 5 illustrates a source line driver according to another embodiment of the present invention.

  In the source line driver 400 of FIG. 5, comparison of data between pixels is performed at a data element (for example, color component) level. Referring to FIG. 5, three data comparison circuits 430, 432, and 434 are provided for controlling the source line driver circuits 410 and 420 by comparing values of data elements of two pixels.

  Buffer amplifiers R_BUF1, G_BUF1, B_BUF1, R_BUF2, G_BUF2, B_BUF2 are selectively deactivated by corresponding control signals R_OPCON1, R_OPCON2, G_OPCON1, G_OPCON2, B_OPCON1, B_OPCON2.

  The outputs RBON1, GBON1, BBON1, RBON2, GBON2, BBON2 of the buffer amplifiers R_BUF1, G_BUF1, B_BUF1, R_BUF2, G_BUF2, B_BUF2 are individually controlled by switches R_SW1, G_SW1, B_SW1, R_SW2, G_SW2, B_SW2, respectively. And the corresponding output lines ROUT1, GOUT1, BOUT1, ROUT2, GOUT2, and BOUT2 of the second source line driver circuits 410 and 420.

  The outputs RBON1, GBON1, BBON1 of the buffer amplifiers R_BUF1, G_BUF1, B_BUF1 are selectively connected to the output lines ROUT2, GOUT2, BOUT2 by the switches SSW1, SSW2, SSW3.

  The first data comparison circuit 430 compares the red color component values DATA_R1 and DATA_R2 of the two pixels and generates control signals R_OPCON1, R_OPCON2, R_COCON1, R_CONCON2, thereby buffer amplifiers R_BUF1, R_BUF2 and switches SSW1, R_SW1, R_SW2 is controlled.

  The second data comparison circuit 432 compares the green color component values DATA_G1, DATA_G2 of the two pixels and generates control signals G_OPCON1, G_OPCON2, G_CONCON1, G_CONCON2, thereby providing buffer amplifiers G_BUF1, G_BUF2 and switches SSW2, G_SW1, G_SW2 is controlled.

  The third data comparison circuit 434 compares the blue color component values DATA_B1, DATA_B2 of the two pixels and generates control signals B_OPCON1, B_OPCON2, B_COCON1, B_CONCON2, thereby providing buffer amplifiers B_BUF1, B_BUF2 and switches SSW3, B_SW1, B_SW2 is controlled.

  In the same manner as described above with reference to FIG. 4, the OPS1, COS1, SELS1, OPS2, COS2, SELS2, OPS3, COS3, and SELS3 signals are pixel element level control signals R_OPCON1, R_OPCON1, R_CONON2, SWL_CON1, G_OPCON1, G_OPCON2, G_CONON1, G_CONON2, SEL_CON2, B_OPCON1, B_OPCON2, B_CONON1, B_COCON2, SEL_CON3 can be global selection and control signals.

  OPS1, COS1, SELS1, OPS2, COS2, SELS2, OPS3, COS3, SELS3 signals and corresponding pixel element level control signals R_OPCON1, R_COCON1, R_COCON2, SEL_CON1, G_OPCON1, generated from the data comparison circuits 430, 432, 434 G_OPCON2, G_CONCON1, G_CONCON2, SEL_CON2, B_OPCON1, B_OPCON1, B_COCON1, B_COCON2, SEL_CON3 are ORed, so that OPS1, COS1, SELS1, OPS2, COS2, SELS2, OPS3, COS3, SOS3, COS3, COS3, COS3, COS3, 432, 434 and source line driver circuits 410, 42 It may operate as a test mode signal applied to.

  A test device having a reduced pin count in this manner can be used with embodiments of the present invention.

  The data comparison circuits 430, 432, and 434 compare 6-bit RGB element data corresponding to two pixels. If the data are the same, the data comparison circuits 430, 432, and 434 have the buffer amplifiers R_BUF2, G_BUF2, B_BUF2 of the second source line driver circuit 420. One of them is disabled, and the first source line driver circuit 410 is used to control the output lines ROUT1, GOUT1, BOUT1, ROUT2, GOUT2, and BOUT2.

  That is, the buffer amplifiers R_BUF1, G_BUF1, and B_BUF1 operate as a common buffer amplifier that drives two sets of source lines based on data comparison. In particular, Tables 2 to 4 below describe the state of the control signal according to the result of the data comparison.

In Tables 2 to 4 above, the activation signal means connection of a corresponding switch or activation of a buffer amplifier.
FIG. 6 is a diagram illustrating a source line driver according to another embodiment of the present invention.

  In the source line driver 500 of FIG. 6, a value to be driven to the source line is compared with respect to one pixel. Here, the channel means a pixel element. That is, for example, in an RGB system, one pixel includes a red channel, a green channel, and a blue channel.

  In the embodiment of FIG. 6, the data of two channels of one pixel are compared, the additional channels of the pixel are compared, and the corresponding driver is controlled based on such comparison.

  Referring to FIG. 6, the first source line driver 510 for the first channel of the pixel and the second source line driver 520 for the second channel of the pixel are controlled by the data comparison circuit 530.

  The data comparison circuit 530 receives data for the channel of pixels driven by the first and second source line driver circuits 510 and 520 and selectively operates the first and second source line driver circuits 510 and 520. Receiving a common control signal for controlling.

  The data comparison circuit 530 generates individual control signals for controlling the first and second source line driver circuits 510 and 520 using the received channel data and the common control signal.

  Channel data CHN_DATA 1 and CHN_DATA 2 are input to the data comparison circuit 530 and input to the respective channel decoder circuits CHN_DEC 1 and CHN_DEC 2 of the source line driver circuits 510 and 520. The channel decoder circuits CHN_DEC1, CHN_DEC2 convert the digital channel data into analog values CHN_VOL1, CHN_VOL2 and apply them to the corresponding buffer amplifiers CHN_BUF1, CHN_BUF2.

  Buffer amplifiers CHN_BUF1, CHN_BUF2 are selectively deactivated by control signals OPCON1, OPCON2. The outputs RBON and GBON of the buffer amplifiers CHN_BUF1 and CHN_BUF2 are connected to corresponding output lines ROUT and GOUT of the first and second source line driver circuits 510 and 520 by two switches C_SW1 and C_SW2 which are controlled separately.

  The switch C_SW1 is controlled in response to the control signal COCON1, and the switch C_SW2 is controlled in response to the control signal COCON2. The output RBON of the buffer amplifier CHN_BUF1 is selectively connected to the output line GOUT by the switch SSW. The switch SSW is controlled by a control signal SEL_CON.

  The OPS, COS, and SELS signals can be global selection and control signals used to generate channel level control signals OPCON1, OPCON2, COCON1, COCON2, and SEL_CON.

  By performing an OR operation on the OPS, COS, and SELS signals and the channel level control signals OPCON1, OPCON2, COCON1, COCON2, and SEL_CON generated from the data comparison circuit 530, the OPS, COS, and SELS signals are supplied to the data comparison circuit 530. It can operate as a test mode signal that passes through and is applied to the source line driver circuits 510 and 520.

  A test device having a reduced pin count in this manner can be used with embodiments of the present invention.

  The data comparison circuit 530 compares the channel data CHN_DATA1 and DHN_DATA2 for the two channels of the pixel, and if the data is the same, disables the buffer amplifier CHN_BUF2 of the second source line driver circuit 520 and outputs the first source. The line driver circuit 510 is used to control the output lines ROUT and GOUT.

  That is, the buffer amplifier CHN_BUF1 operates as a common buffer amplifier for the two channel data of the pixel based on the comparison of the data for the two channels. In particular, Table 5 below illustrates the state of the control signal according to the result of the data comparison.

In Table 5 above, the activation signal means the connection of the corresponding switch or the activation of the buffer amplifier. That is, for example, if the OPCON2 signal is activated, the buffer amplifier CHN_BUF2 is activated, and if the OPCON2 signal is deactivated, the buffer amplifier CHN_BUF2 is deactivated. Similarly, if the SEL_CON signal is activated, the switch SSW is connected, and if the SEL_CON signal is deactivated, the switch SSW is separated.
7A and 7B are diagrams for explaining a part of the buffer amplifier circuit.

  FIG. 7A shows an input circuit of a buffer amplifier, which includes input transistors T2 and T3 and a control transistor T1. The control transistor T1 can reduce the current of the input circuit of the buffer amplifier by selectively separating the input transistors T2 and T3 from the power supply voltage VDD.

  Similarly, FIG. 7B is an output circuit of the buffer amplifier, and includes output transistors T11 and T13 and control transistors T10 and T12. The control transistors T10 and T12 can reduce the current of the output circuit of the buffer amplifier by selectively connecting the gates of the output transistors T11 and T13 to the voltage VDD or VSS.

  FIG. 8 is a diagram illustrating a data comparison circuit.

  Referring to FIG. 8, N-bit first input data DATA_A <1>,. . . , DATA_A <N> is the corresponding N-bit second input data DATA_B <1>,. . . , DATA_B <N> and XOR means 700, 702,. . . , 706.

  XOR means 700, 702,. . , 706 are subjected to NOR operation by the NOR means 710, and the output of the NOR means 710 is used to control the multiplexers 720, 722 and 724. The outputs of the multiplexers 720, 722, and 724 are subjected to NOR operation by OPS, COS, and SELS signals and NOR means (not shown).

  The output of the NOR means 710 is provided to a first multiplexer 720 that receives OPCON1 and GROUND as inputs. If “low level” indicating that at least one bit pair of the input data pairs is not the same is output as the output of the NOR means 710, OPCON1 is output as OPCON2 from the first multiplexer 720, and the buffer amplifier Activated.

  If “high level”, which means that both input data pairs are the same, is output as the output of the NOR means 710, GROUND is output as OPCON2 from the first multiplexer 720, and the second buffer amplifier is deactivated. Is done.

  The output of the NOR means 710 is provided to a second multiplexer 722 that receives COCON1 and GROUND as inputs. If “low level” meaning that at least one bit pair of the input data pairs is not the same as each other is output as the output of the NOR means 710, COCON1 is output from the second multiplexer 722 as COCON2, and the buffer amplifier Connected to the corresponding output line.

  If “high level”, which means that the input data pairs are the same, is output as the output of the NOR means 710, GROUND is output from the second multiplexer 722 as COCON2, and the second buffer amplifier outputs the corresponding output. Separated from the line.

  The output of the NOR means 710 is provided to a third multiplexer 724 that receives VDD and GROUND as inputs. If “low level” indicating that at least one bit pair of the input data pairs is not the same is output as the output of the NOR means 710, GROUND is output as SELCON from the third multiplexer 724, and the second buffer A first buffer amplifier is isolated from an output line coupled to the amplifier.

  If “high level”, which means that the input data pairs are the same, is output as the output of the NOR means 710, VDD is output as SELCON from the third multiplexer 724 and connected to the second buffer amplifier. A first buffer amplifier is connected from the output line.

  The data comparison circuit of FIG. 8 uses XOR means and NOR means to compare data bits. However, those skilled in the art will recognize that other structures of circuits can be used. For example, the XNOR means can be used to compare the data bits and the AND means (AND) collects the comparison values.

  Also, a NOR or AND gate that collects the outputs of the XOR means by inverting the multiplexer input can be an OR or NAND gate. Similarly, the collective logic gate (ie, NOR means 710) has N inputs in FIG. 8, but multiple logic gates may be utilized to perform the same function. Therefore, the embodiment of the present invention is not limited to the structure of FIG.

  FIG. 9 illustrates a source line driver according to another exemplary embodiment of the present invention.

  The source driver 800 of FIG. 9 according to an embodiment of the present invention may include a partial buffer of the buffer amplifiers in the source driver 800 when the hue data controlling adjacent cells of a panel (not shown) is the same. After the amplifiers are turned on and the remaining buffer amplifiers are turned off, the hues of the cells adjacent to each other are simultaneously controlled using the turned-on buffer amplifiers.

  The first R channel data DATA_R1, the first G channel data DATA_G1, the first B channel data DATA_B1, the second R channel data DATA_R2, the second G channel data DATA_G2, and the second B channel data DATA_B2 each having 18 bits of data DATA_RGB1 and DATA_RGB2, each of which is 6 bits. Therefore, the description is omitted here.

  The meaning that the hue data DATA_RGB1 and the hue data DATA_RGB2 are the same means that the first R channel data DATA_R1 and the second R channel data DATA_R2 are the same, the first G channel data DATA_G1 and the second G channel data DATA_G2 are the same, This means that the first B channel data DATA_B1 and the second B channel data DATA_B2 are the same.

  Since the data comparison circuit 830 of the source line driver circuit 800 has the same function as the data comparison circuit 230 of FIG. 5, detailed description thereof is omitted here.

  The first source line driver circuit 810 receives the hue data DATA_RGB1 and controls the hue of the corresponding cell. The second source line driver circuit 820 receives the hue data DATA_RGB2 and controls the hue of the corresponding cell.

  The source line driver circuit 800 includes a plurality of driver circuits having a structure similar to that of the first source line driver circuit 810 or the second source line driver circuit 820. Here, for convenience of explanation, only an arbitrary first source line driver circuit 810 and second source line driver circuit 820 will be described.

  Cells of a panel (not shown) controlled by the first source line driver circuit 810 and the second source line driver circuit 820 are adjacent to each other. FIG. 9 illustrates only the case where the two pieces of hue data are the same, but this is only an embodiment, and the present invention is limited only to the case where the two pieces of hue data are the same. It is not something. That is, the present invention can also be applied when three or more pieces of hue data are the same.

  If the hue data DATA_RGB1 and the hue data DATA_RGB2 are the same, some of the buffer amplifiers are turned on and the remaining buffer amplifiers are turned off.

  More specifically, if the hue data DATA_RGB1 and the hue data DATA_RGB2 are the same, the odd-numbered buffer amplifiers of the buffer amplifiers are turned on and the even-numbered buffer amplifiers are turned off.

  The operation of the buffer amplifier is controlled by control signals OPCON1, OPCON2, COCON1, COCON2, and SEL_CON output from the data comparison circuit 830.

  The first source line driver circuit 810 includes decoding units DR1, DG1, DB1, buffer amplifiers R_BUF1, G_BUF1, B_BUF1, and switches R_SW1, G_SW1B_SW1.

  The decoding units DR1, DG1, and DB1 decode the first R channel data DATA_R1, the first G channel data DATA_G1, and the first B channel data DATA_B1, and output analog values R_VOL1, G_VOL1, and B_VOL1.

  The first R channel data DATA_R1 is 6-bit data. If the first R channel data DATA_R1 and the second R channel data DATA_R2 are the same, the analog values R_VOL1, R_VOL2 have the same voltage level.

  Therefore, the hue of the cell corresponding to the second R channel data DATA_R2 can be controlled using the first R channel data DATA_R1 instead of the second R channel data DATA_R2. The buffer amplifiers R_BUF1, G_BUF1, and B_BUF1 are turned on or off in response to the first and second operation control signals OPCON1, OPCON2, and OPCON1, respectively.

  The switches R_SW1 and B_SW1 connect or disconnect the output lines ROUT1 and BOUT1 respectively corresponding to the output ends RBON1 and BBON1 of the buffer amplifiers R_BUF1 and B_BUF1 in response to the first connection control signal COCON1.

  The switch G_SW1 connects or disconnects the output line GOUT1 corresponding to the output terminal GBON1 of the buffer amplifier G_BUF1 in response to the second connection control signal CONN2.

  Since the structure of the second source line driver circuit 820 is the same as that of the first source line driver circuit 810, detailed description thereof is omitted here. The buffer amplifiers R_BUF2, B_BUF2 buffer and output the analog values R_VOL2, B_VOL2, respectively, and are turned on or off in response to the second operation control signal OPCON2.

  The buffer amplifier G_BUF2 buffers and outputs the analog value G_VOL2, and is turned on or off in response to the first operation control signal OPCON1. The switches R_SW2 and B_SW2 connect or disconnect the output lines ROUT2 and BOUT2 corresponding to the output ends RBON2 and BBON2 of the buffer amplifiers R_BUF2 and B_BUF2 in response to the second connection control signal COCON2.

  The switch G_SW2 connects or disconnects the output line GOUT2 corresponding to the output terminal GBON2 of the buffer amplifier G_BUF2 in response to the first connection control signal CONN1.

  The output terminal RBON1 of the buffer amplifier R_BUF1 and the output line ROUT2 are connected or disconnected by the first selection switch SSW1, and the output terminal GBON2 of the buffer amplifier G_BUF2 and the output line GOUT1 are connected or disconnected by the second selection switch SSW2, The output terminal BBON1 and the output line BOUT2 of the buffer amplifier B_BUF1 are connected or disconnected by the third selection switch SSW3.

  The first to third selection switches SSW1, SSW2, and SSW3 are controlled in response to the selection control signal SEL_CON.

  If the hue data DATA_RGB1 and the hue data DATA_RGB2 are the same, the first operation control signal OPCON1 is activated to turn on the buffer amplifiers R_BUF1, G_BUF2, B_BUF1. The second operation control signal OPCON2 is deactivated to turn off the buffer amplifiers R_BUF2, G_BUF1, and B_BUF2.

  If the hue data DATA_RGB1 and the hue data DATA_RGB2 are the same, the first connection control signal CONCON1 is activated to connect the switches R_SW1, G_SW2, and B_SW1. The second connection control signal COCON2 is deactivated and blocks the switches R_SW2, G_SW1, and B_SW2.

  If the hue data DATA_RGB1 and the data DATA_RGB2 are the same, the selection control signal SEL_CON is activated to connect the first to third selection switches SSW1, SSW2, and SSW3.

  Thus, if the hue data DATA_RGB1 and the hue data DATA_RGB2 are the same, the odd-numbered buffer amplifiers R_BUF1, G_BUF2, B_BUF1 among the six buffer amplifiers of the first and second source line driver circuits 810, 820 are turned on. The switches R_SW1, G_SW2, and B_SW1 are connected, and the first to third selection switches SSW1, SSW2, and SSW3 are connected.

  Accordingly, two cells adjacent to each other can be controlled using only three buffer amplifiers R_BUF1, G_BUF2, and B_BUF1 among the six buffers. That is, the analog value R_VOL1 is applied to the output line ROUT1 and the output line ROUT2, the analog value B_VOL1 is applied to the output line BOUT1 and the output line BOUT2, and the analog value G_VOL1 is applied to the output line GOUT2 and the output line GOUT1. Applied.

  If the hue data DATA_RGB1 and the hue data DATA_RGB2 are the same, the analog values R_VOL1, R_VOL2 have the same voltage level, the analog values G_VOL1, G_VOL2 have the same voltage level, and the analog values B_VOL1, B_VOL2 are Have the same voltage level.

  Therefore, even if the analog values R_VOL1, G_VOL2, and B_VOL1 are applied to the two cells in the same manner as described above, the two cells display the same hue. Since the buffer amplifiers R_BUF2, G_BUF1, and B_BUF2 are turned off, the source line driver circuit 800 can reduce current consumption.

  If the hue data DATA_RGB1 and the hue data DATA_RGB2 are different, the source line driver circuit 800 operates in the same manner as a normal operation.

  The source line driver circuit 800 of FIG. 9 has been described that when the hue data DATA_RGB1 and the hue data DATA_RGB2 are the same, the odd-numbered buffer amplifier is turned on and the even-numbered buffer amplifier is turned off. In some cases, even-numbered buffer amplifiers are turned on and odd-numbered buffer amplifiers are turned off. A person skilled in the art can understand a method of constructing such a circuit, and therefore a detailed description thereof is omitted here.

  If the hue data DATA_RGB1 and the hue data DATA_RGB2 are the same, the data comparison circuit 830 activates the first operation control signal OPCON1 and deactivates the second operation control signal OPCON2 in response to the control signal OPS.

  If the hue data DATA_RGB1 and the hue data DATA_RGB2 are different, the data comparison circuit 830 activates both the first operation control signal OPCON1 and the second operation control signal OPCON2 in response to the control signal OPS.

  Further, if the hue data DATA_RGB1 and the hue data DATA_RGB2 are the same, the data comparison circuit 830 activates the first connection control signal COCON1 and deactivates the second connection control signal COCON2 in response to the control signal COS. Let

  If the hue data DATA_RGB1 and the hue data DATA_RGB2 are different, the data comparison circuit 830 activates both the first connection control signal COCON1 and the second connection control signal COCON2 in response to the control signal COS.

  The data comparison circuit 830 activates the selection control signal SEL_CON in response to the control signal SELS if the hue data DATA_RGB1 and the hue data DATA_RGB2 are the same, and controls if the hue data DATA_RGB1 and the hue data DATA_RGB2 are different. The selection control signal SEL_CON is deactivated in response to the signal SELS.

  In this way, the hue data DATA_RGB1 and the hue data DATA_RGB2 are compared, and the data comparison circuit 830 performs a function of changing the level of the output signal depending on whether or not the hue data DATA_RGB1 and the hue data DATA_RGB2 are the same. Since the circuit structure is easily understood by those skilled in the art, a detailed description thereof is omitted here.

  FIG. 10A is a diagram for explaining the test operation of the internal buffer of the source line driver circuit of FIG.

  Corresponding pads DQR1, DQG1, DQB1, DQR2, DQG2, DQB2 are connected to the output lines ROUT1, GOUT1, BOUT1, ROUT2, GOUT2, BOUT2 of the source line driver circuit 200 of FIG. If the data DATA_RGB1 and the data DATA_RGB2 are the same, as shown in FIG. 9A, the buffer amplifiers R_BUF1, G_BUF1, B_BUF1 of the first source line driver circuit 210 are turned on to operate, and the second source line driver circuit 220 is operated. The buffer amplifiers R_BUF2, G_BUF2, B_BUF2 are turned off and do not operate.

  At this time, the probe chips T1, T2, T3 for testing the buffer amplifiers R_BUF1, G_BUF1, B_BUF1, R_BUF2, G_BUF2, B_BUF2 of the source line driver circuit 200 are connected only to the pads DQR2, DQG2, DQB2. Thereby, the turned-on buffer amplifiers R_BUF1, G_BUF1, B_BUF1 are tested by the probe tips T1, T2, T3.

  Next, the buffer amplifiers R_BUF2, G_BUF2, B_BUF2 are tested by connecting the turned-off buffer amplifiers R_BUF2, G_BUF2, B_BUF2 to the pads DQR2, DQG2, DQB2 (indicated by dotted lines in FIG. 9A).

  As shown in FIG. 10A, the positions of the probe tips T1, T2, and T3 are repeated and connected for every three pads. In this method, two chips can be tested simultaneously by reducing the number of probe chips T1, T2, and T3 connected to the pads.

  FIG. 10B is a view for explaining an embodiment of a method for arranging the pads of FIG. 10A.

  When the pads of FIG. 10A are arranged as shown in FIG. 10B, such an arrangement structure is called a twist type arrangement structure. In FIG. 9B, it can be seen that the probe E tips T1, T2, T3 are repeated and connected every three pads.

  FIG. 11 is a diagram illustrating connection of probe chips for testing an internal buffer amplifier of the source line driver circuit of FIG.

  Referring to FIG. 11, pads DQR1, DQG1, DQB1, DQR2, DQG2, and DQB2 corresponding to the output lines ROUT1, GOUT1, BOUT1, ROUT2, GOUT2, and BOUT2 of the source line driver circuit 800 disclosed in FIG. 9 are connected. Probe pads T1, T2, and T3 for testing the buffer are connected to some of pads DQR1, DQG1, DQB1, DQR2, DQG2, and DQB2.

  Then, all the buffers are tested as the selection control signal SEL_CON and the second connection control signal COCON2 are activated alternately.

  12A is a diagram for explaining a test operation of the internal buffer amplifier of the source line driver circuit of FIG.

  The test operation is further described. The probe chips T1, T2, T3 are connected to output pads DQG1, DQR2, DQB2 corresponding to the buffer amplifiers G_BUF1, R_BUF2, B_BUF2 controlled in response to the second operation control signal OPCON2.

  In the test operation, if the selection control signal SEL_CON is activated and the second connection control signal COCON2 is deactivated, the buffer amplifiers R_BUF1, G_BUF2, B_BUF1 controlled in response to the first operation control signal OPCON1 are first used. To be tested.

  At this time, test data for testing the buffer amplifier is applied to all the buffer amplifiers R_BUF1, G_BUF1, B_BUF1, R_BUF2, G_BUF2, B_BUF2, but the buffer amplifiers R_BUF1, G_BUF2, B_BUF1 are tested first.

  When the selection control signal SEL_CON is deactivated and the second connection control signal COCON2 is activated, the buffer amplifiers R_BUF2, G_BUF1, B_BUF2 controlled in response to the second operation control signal OPCON2 are tested ( (Displayed as a dotted line in FIG. 12A).

  In the test mode, the source line driver circuit 800 in FIG. 9 receives a control signal (not shown) from an external test apparatus (not shown) and controls the selection control signal SEL_CON and the second connection control signal CONN2. Control logic (not shown) is further provided. Since control logic (not shown) for controlling the test operation of the source line driver circuit 800 can be understood by those skilled in the art, a detailed description thereof is omitted here.

  FIG. 12B is a view for explaining an embodiment of a method for arranging the pads in FIG. 12A.

  When the arrangement of the pads is the above-described twist type arrangement, the probe chips T1, T2, and T3 for testing the source line driver circuit 800 of FIG. 9 are connected to each next pad by skipping one pad.

  The test method of FIG. 11 has an advantage that two chips can be tested simultaneously by reducing the number of probe chips T1, T2 and T3 connected to the pad in half. In addition, since the distance between the probe chips T1, T2, and T3 is longer than that of the test method of FIG. 10A, the test method of FIG. 11 can prevent malfunction of the probe card during the test operation.

  In the embodiments of the present invention, the expression “switch” is used, but “switch” means a switching device, and includes means such as a solid state device, mechanical means, or other means. Therefore, for example, transistors may be used as the switches C_SW1, C_SW2, R_SW1, R_SW2, G_SW1, G_SW2, B_SW1, B_SW2, SSW, SSW1, SSW2, and SSW3.

  That is, in an embodiment of the present invention, the switch is not limited to special switching means, but includes means that can selectively couple the amplifier to the output. The signal can be changed between a high level and a low level depending on the circuit structure. While embodiments of the present invention have been described for RGB data, other types of data such as YPrB can also be utilized.

  It is also possible to compare three or more color components. For example, if a white color component is present, the pixel or channel value comparison will operate based on the white color component. That is, embodiments of the present invention are not limited to RGB data, but can be used in any system that requires a comparison of values for pixels or pixel channels.

  Embodiments of the present invention describe a comparison of two channels or two channels for one pixel. However, two or more pixels or channels may be compared. In such an example, the output of the buffer amplifier can be selectively coupled to more than one source line.

  The output to which the buffer amplifier is coupled can be selected or fixed based on the comparison result. For example, when values for two or more pixels are compared, embodiments of the present invention may depend on whether all values are the same, or two or more values are the same. Can be controlled.

  Channel level comparisons or pixel level comparisons may be mixed. For example, when two channels are compared, the two channels can be the same pixel channel or different pixel channels.

  The value compared can be static or dynamic. Thus, the pattern can be repeated such that the data value of the first pixel is compared with the data value of the second pixel and the data value of the second pixel is compared with the data value of the third pixel. On the other hand, in a static system, the data value of the first pixel is compared with the data value of the second pixel, and the data value of the third pixel is compared with the data value of the fourth pixel.

  As described above, the optimal embodiment has been disclosed in the drawings and specification. Here, specific terminology has been used, but is used merely for the purpose of describing the present invention and limits the meaning of the invention as defined by the meaning and claims. It was not used for that purpose.

  Accordingly, those skilled in the art will appreciate from this that various modifications and equivalent other embodiments are possible. Therefore, the technical scope of the present invention must be determined based on the description of the scope of claims.

  The present invention is used in a display device, and in particular, can be used in a source driver circuit of a display device using liquid crystal.

1 is a diagram illustrating a structure of a general source line driver circuit. 6 is a diagram illustrating another structure of a general source line driver circuit. 1 is a block diagram illustrating a display device according to an embodiment of the present invention. 3 is a diagram illustrating a source line driving circuit of a display device according to an exemplary embodiment of the present invention. 4 is a diagram illustrating a source line driving circuit of a display apparatus according to another exemplary embodiment of the present invention. 6 is a diagram illustrating a source line driving circuit of a display device according to another exemplary embodiment of the present invention. It is drawing which shows a part of amplifier circuit. It is drawing which shows a part of amplifier circuit. It is drawing explaining a data comparison circuit. 6 is a diagram illustrating a source line driver circuit according to another exemplary embodiment of the present invention. 5 is a diagram for explaining a test operation of an internal buffer of the source driver of FIG. 4. It is drawing explaining one Embodiment of the arrangement | positioning method of the pad of FIG. 7A. 10 is a diagram illustrating connection of probe chips for testing an internal buffer of the source line driver circuit of FIG. 9. 10 is a diagram illustrating a test operation of an internal buffer of the source line driver circuit of FIG. 9. It is drawing explaining one Embodiment of the arrangement | positioning method of the pad of FIG. 12A.

Explanation of symbols

200 source line driver circuit 210 first source line driver circuit 220 second source line driver circuit

Claims (95)

The first hue data for driving the first buffer connected to the first source line of the display device is compared with the second hue data for driving the second buffer connected to the second source line of the display device. And the stage of
Selectively driving the second source line using the first buffer if the comparison result of the first hue data and the second hue data is the same ;
A source line driving method of a display apparatus, wherein the second buffer is selectively disabled when the comparison result of the first hue data and the second hue data is the same . The first hue data and the second hue data are respectively
It said first and R-channel data provided to the second source line, a source line driving method of a display device according to claim 1, characterized in that it comprises a G channel data and B-channel data. The first hue data includes one of R channel data, G channel data, and B channel data, and the second hue data includes the first hue data of R channel data, G channel data, and B channel data. corresponding comprise one channel data to the first source line and the second source line, according to claim 1, characterized in that the source lines corresponding one of the source lines connected to two different pixels Source line driving method for display devices in Japan. The first hue data includes one of R channel data, G channel data, and B channel data, and the second hue data includes another one of R channel data, G channel data, and B channel data. The method of claim 1 , further comprising: a source line driving method for a display device according to claim 1 . The comparison step includes
The source line driving method of claim 1 , wherein the first hue data and the second hue data are determined to have the same value. The first and second hue data includes RGB data for two different pixels, the first buffer includes a first R buffer, a first G buffer, and a first B buffer, and the second buffer includes a second R buffer. The method of claim 1 , further comprising a buffer, a second G buffer, and a second B buffer. Selectively disabling the second buffer comprises:
If the first buffer is driving the first source line and the second source line, according to claim 1, wherein the selectively disconnecting it the connection between the second buffer and said second source line A source line driving method for a display device. Selectively disabling the second buffer comprises:
The source line driving method of claim 1 , wherein the differential amplification input circuit and / or the output drive circuit of the second buffer are selectively disabled.   The method of claim 1, wherein the first source line and the second source line are source lines of the same pixel.   The method of claim 1, wherein the first source line and the second source line are source lines of different pixels. The first hue data and the second hue data are respectively
The method as claimed in claim 1, further comprising R channel data, G channel data, B channel data and / or white data provided to the first and second source lines.   The method of claim 1, wherein the display device is a liquid crystal display device. The first hue data for driving the first buffer connected to the first source line of the display device is compared with the second hue data for driving the second buffer connected to the second source line of the display device. The stage to do is
First hue data for driving a plurality of first buffers connected to a plurality of first source lines, and a plurality of second buffers connected to a plurality of second source lines. Comparing the second hue data with
Selectively disabling the second buffer, and selectively driving the second source line using the first buffer if the comparison result of the first hue data and the second hue data is the same. Is
The plurality of second buffers are selectively disabled, and if the comparison result between the first hue data and the second hue data is the same, the plurality of second buffers are used using the plurality of first buffers. The method of claim 1 , further comprising selectively driving the source line. Comparing hue data for driving a first source line of a display device and hue data for driving at least one other source line of the display device;
If the comparison result is the same, the steps of selectively driving the result the common source line buffers in at least one other source lines and said first source line,
And deactivating the source line buffer of the at least one other source line if the at least one other source line is driven by the common source line buffer. Source line driving method. The step of comparing the hue data includes:
Comparing the hue data for driving the first source line of the display device and the hue data for driving each of the plurality of other source lines of the display device;
If the comparison result is the same, the step of selectively driving the result the common source line buffers in at least one other source lines and said first source line, the first source line and the common source line buffer Driving a selected line of the plurality of other source lines;
The method of claim 14 , wherein the step of deactivating the source line buffer comprises deactivating a source line buffer for each of the plurality of source lines driven by the common source line buffer. A source line driving method for a display device. 15. The source line of the display apparatus of claim 14 , wherein the step of deactivating the source line buffer selectively disables the differential amplification input circuit and / or the output drive circuit of the source line buffer. Driving method. The method of claim 14 , wherein the first source line and the at least one other source line are source lines of the same pixel. The method of claim 14 , wherein the first source line and the at least one other source line are source lines of different pixels. 15. The source of the display apparatus of claim 14 , wherein the first source line and the at least one other source line are source lines provided with the same color component for at least two different pixels. Line driving method. The method of claim 14 , wherein the first source line and the at least one other source line are source lines provided with different color components. 21. The source line driving method of claim 20 , wherein the first source line and the at least one other source line are source lines of different pixels. 21. The source line driving method of claim 20 , wherein the first source line and the at least one other source line are source lines of one pixel. The first source line includes a plurality of first source lines, and the at least one other source line includes a plurality of second source lines,
Comparing the hue data for driving the first source line of the display device with the hue data for driving at least one other source line of the display device;
Comparing hue data for driving the plurality of first source lines of the display apparatus with hue data for driving the plurality of second source lines of the display apparatus;
If the comparison result is the same, the step of selectively driving the result the common source line buffers in at least one other source lines and said first source line,
If the comparison result is the same, comprises selectively the driving stages and a plurality of common source line buffer thus the plurality of first source lines and the plurality second source line,
If the at least one other source line is driven by the common source line buffer, the step of deactivating the source line buffer of the at least one other source line may be performed by the plurality of second source lines. The source line driving of claim 14 , further comprising the step of deactivating the source line buffers of the plurality of second source lines when driven by the plurality of common source line buffers. Method. The hue data for driving the plurality of first source lines of the display apparatus and the hue data for driving the plurality of second source lines of the display apparatus include RGB data. The source line driving method of the display device according to claim 23 . Comparing the hue data for driving the plurality of first source lines of the display device with the hue data for driving the plurality of second source lines of the display device;
Hue according to the display device the plurality of the first source line of hue data for driving the plurality of second source line elements as the display device of the hue data for driving the first source line 24. The method of claim 23 , comprising comparing the corresponding elements of the data . Comparing the hue data for driving the plurality of first source lines of the display device with the hue data for driving the plurality of second source lines of the display device;
Comparing all hue data for driving the plurality of first source lines of the display device with all hue data for driving the plurality of second source lines of the display device. 24. The source line driving method of a display device according to claim 23 . The hue data for driving the first source line of the display device includes R channel data, G channel data, B channel data, and / or white data,
The hue data for driving at least one other source lines of the display device, according to claim 14, characterized in that it comprises R-channel data, G channel data, the B-channel data and / or white data A source line driving method for a display device. The method of claim 14 , wherein the display device is a liquid crystal display device. In the buffer circuit that drives the source line of the display device,
A data comparison circuit for comparing a first hue data value provided to a first source line of the display device and a second hue data value provided to a second source line;
A first buffer for driving the first source line based on the first hue data value;
Based on the second color data value, a second buffer for driving the second source line, said second buffer, said second buffer if said by that comparison result to the data comparison circuit is the same The second buffer to be selectively disabled;
If the comparison result is identical with the data comparator circuit, a buffer circuit, characterized in that and a first switching circuit electrically selectively connecting the first buffer to the second source line. The first hue data and the second hue data are respectively
30. The buffer circuit of claim 29 , comprising R channel data, G channel data, and B channel data provided to the first and second source lines. The first hue data includes one of R channel data, G channel data, and B channel data, and the second hue data includes the first hue data of R channel data, G channel data, and B channel data. corresponding comprise one channel data to the first source line and the second source line, to claim 3 0, characterized in that the source lines corresponding one of the source lines connected to two different pixels The buffer circuit described. The first hue data includes one of R channel data, G channel data, and B channel data, and the second hue data includes another one of R channel data, G channel data, and B channel data. 30. The buffer circuit according to claim 29 , further comprising: The data comparison circuit includes:
30. The buffer circuit according to claim 29 , wherein it is determined whether or not the first hue data and the second hue data have the same value. The first hue data and the second hue data include RGB data for two different pixels of the display device;
The first buffer includes a first red buffer for driving a first red source line, a first green buffer for driving a first green source line, and a first blue buffer for driving a first blue source line,
Said second buffer, said comparison result by the data comparing circuit is selectively disabled when the same, a second red buffer for driving the second red source lines, the data comparison result of the comparison by the circuit are the same it is selectively disabled if, second green buffer for driving the second green source line, wherein the data comparison result of the comparison by the circuit is selectively disabled when the same is driving the second blue source lines With a second blue buffer,
Comparison said first switching circuit, if the comparison result is identical with the data comparator circuit, selectively electrically connecting the first red buffer to the second red source line, due to the data comparison circuit if the result is the same, the first green buffer selectively electrically connected to the second green source line, if the comparison result is identical with the data comparison circuit, the first blue buffer the 30. The buffer circuit of claim 29 , wherein the buffer circuit is selectively electrically connected to the second blue source line. If the comparison result is identical with the data comparator circuit, electrically selectively solved coupled between said second buffer said second source line, it first buffer coupled to the second source line 30. The buffer circuit of claim 29 , further comprising a second switching circuit for disconnecting the connection of the second buffer. The data comparison circuit includes:
A plurality of logic gates for comparing corresponding data bits of the first and second hue data values;
If the outputs of the plurality of logic gates are all the same value, the sum of the outputs of the plurality of logic gates to output a first signal;
36. The buffer circuit of claim 35 , further comprising: a plurality of multiplexers that selectively provide a control signal to the first and second switching circuits based on an output of the summing logic gate. The plurality of multiplexers are:
37. The buffer circuit according to claim 36 , comprising a plurality of exclusive OR gates, wherein the summing logic gate comprises an inverting OR gate. The summing logic gate is
37. The buffer circuit according to claim 36 , comprising a plurality of logic gates. The plurality of multiplexers are:
A first multiplexer for generating a control signal for controlling the operation of the second buffer;
A second multiplexer for generating a control signal for controlling an operation of the first switching circuit connecting the first buffer to the second source line;
37. The buffer circuit according to claim 36 , further comprising: a third multiplexer that generates a control signal for controlling an operation of the second switching circuit that separates the second buffer from the second source line. 30. The buffer circuit of claim 29 , wherein the second buffer comprises an input circuit that selectively isolates a transistor from a voltage source when the second buffer is disabled. 41. The buffer circuit according to claim 40 , further comprising the output circuit that controls an output drive transistor of an output circuit that separates an output line of the second buffer from an output voltage source of the second buffer. 30. The buffer circuit according to claim 29 , wherein the display device is a liquid crystal display device. In a system for driving the source line of a display device,
First hue data for driving a first buffer connected to a first source line of a display device and second hue data for driving a second buffer connected to a second source line of the display device. Means for comparing;
If the comparison result is identical with the comparison means comprises means for selectively driving said second source line with the first buffer,
If the comparison result is identical with the comparison means, driving system further comprising a means for selectively disabling said second buffer. The first hue data and the second hue data are respectively
44. The driving system of claim 43 , comprising R channel data, G channel data, and B channel data provided to the first and second source lines. The first hue data includes one of R channel data, G channel data, and B channel data, and the second hue data includes the first hue data of R channel data, G channel data, and B channel data. corresponding comprise one channel data to the first source line and the second source line, according to claim 43, characterized in that the source lines corresponding one of the source lines connected to two different pixels Driving system. The first hue data includes one of R channel data, G channel data, and B channel data, and the second hue data includes another one of R channel data, G channel data, and B channel data. 44. The driving system of claim 43 , comprising: The comparison means includes
44. The driving system according to claim 43 , further comprising means for determining whether the first hue data and the second hue data have the same value. The first and second hue data includes RGB data for two different pixels, the first buffer includes a first R buffer, a first G buffer, and a first B buffer, and the second buffer includes a second R buffer. 44. The driving system of claim 43 , comprising a buffer, a second G buffer, and a second B buffer. Means for selectively disabling the second buffer;
44. The method of claim 43 , wherein when the first buffer drives the first source line and the second source line, the connection between the second buffer and the second source line is selectively disconnected. Driving system. Means for selectively disabling the second buffer;
44. The driving system according to claim 43 , further comprising means for selectively disabling the differential amplification input circuit and / or the output drive circuit of the second buffer. 44. The driving system of claim 43 , wherein the first source line and the second source line are source lines of the same pixel. 44. The driving system of claim 43 , wherein the first source line and the second source line are source lines of different pixels. The first hue data and the second hue data are respectively
44. The driving system of claim 43 , comprising R channel data, G channel data, B channel data and / or white data provided to the first and second source lines. 44. The driving system according to claim 43 , wherein the display device is a liquid crystal display device. First hue data for driving a first buffer connected to a first source line of a display device and second hue data for driving a second buffer connected to a second source line of the display device. The means of comparison is
First hue data for driving a plurality of first buffers connected to a plurality of first source lines and a first hue data for driving a plurality of second buffers connected to a plurality of second source lines. Means for comparing the two hue data;
The second buffer is selectively disabled, and if the comparison result between the first hue data and the second hue data is the same, the second source line is selectively driven using the first buffer. Means
Wherein a plurality of second buffer selectively disabled, if the comparison result is identical with the comparison means, selectively to said plurality of second source lines with the first buffer of said plurality 44. The driving system according to claim 43 , further comprising means for driving. In a system for driving the source line of a display device,
Means for comparing hue data for driving a first source line of a display device with hue data for driving at least one other source line of the display device;
If the comparison result is identical with the comparison means, and selectively driving a means of result the common source line buffers in at least one other source lines and said first source line,
Means for deactivating the source line buffer of the at least one other source line if the at least one other source line is driven by the common source line buffer. The comparing means comprises means for comparing hue data for driving the first source line of the display device with hue data for driving each of the plurality of other source lines of the display device;
If the comparison result is the same, selectively driving a means of result the common source line buffers in at least one other source lines and said first source line, the first source line and the common source line buffer Means for driving a selected line of the plurality of other source lines;
Means for deactivating the source line buffers, claim, characterized in that it comprises means for respectively deactivating the source line buffers for the plurality of source lines are driven by the common source line buffer 56 The driving system described in 1. 57. The driving system according to claim 56 , wherein the means for deactivating the source line buffer comprises means for selectively disabling a differential amplification input circuit and / or an output drive circuit of the source line buffer. . 57. The driving system of claim 56 , wherein the first source line and the at least one other source line are source lines of the same pixel. 57. The driving system of claim 56 , wherein the first source line and the at least one other source line are source lines of different pixels. 57. The driving system of claim 56 , wherein the first source line and the at least one other source line are source lines provided with the same color component for at least two different pixels. The driving system according to claim 56 , wherein the first source line and the at least one other source line are source lines provided with different color components. The driving system of claim 62 , wherein the first source line and the at least one other source line are source lines of different pixels. The driving system of claim 62 , wherein the first source line and the at least one other source line are source lines of one pixel. The first source line includes a plurality of first source lines, and the at least one other source line includes a plurality of second source lines,
Means for comparing hue data for driving the first source line of the display device with hue data for driving at least one other source line of the display device;
Means for comparing hue data for driving the plurality of first source lines of the display device with hue data for driving the plurality of second source lines of the display device;
If the comparison result is the same, the selectively driving a means of result the common source line buffers in at least one other source lines and said first source line,
If the comparison result is the same, comprising a selectively driving to means and a plurality of common source line buffer thus the plurality of first source lines and the plurality second source line,
If the at least one other source line is driven by the common source line buffer, the means for deactivating the source line buffer of the at least one other source line includes the plurality of second source lines being The driving system of claim 56 , further comprising means for deactivating the source line buffers of the plurality of second source lines when driven by the plurality of common source line buffers. The hue data for driving the plurality of first source lines of the display apparatus and the hue data for driving the plurality of second source lines of the display apparatus include RGB data. 66. A driving system according to claim 65 . Means for comparing the hue data for driving the plurality of first source lines of the display device with the hue data for driving the plurality of second source lines of the display device;
Hue according to the display device the plurality of the first source line of hue data for driving the plurality of second source line elements as the display device of the hue data for driving the first source line 66. A driving system according to claim 65 , comprising means for comparing the corresponding elements of the data . Means for comparing the hue data for driving the plurality of first source lines of the display device with the hue data for driving the plurality of second source lines of the display device;
Means for comparing all hue data for driving the plurality of first source lines of the display device with all hue data for driving the plurality of second source lines of the display device; 66. A driving system according to claim 65 . The hue data for driving the first source line of the display device includes R channel data, G channel data, B channel data, and / or white data,
The hue data for driving at least one other source lines of the display device, according to claim 56, characterized in that it comprises R-channel data, G channel data, the B-channel data and / or white data Driving system. The driving system according to claim 56 , wherein the display device is a liquid crystal display device. In a method for driving first and second source lines of a display panel using first and second buffer amplifiers,
Selecting one of the first and second buffer amplifiers driving the second source line if the values of display data driven by the first and second source lines are the same ;
If it is selected for the first buffer amplifier is driving the second source line, driving method characterized by further comprising the step of disabling the second buffer amplifier. The driving method of claim 71 , wherein the first and second source lines are for the same pixel of the display device. The driving method of claim 71 , wherein the first and second source lines are for different pixels of the display device. Selecting one of the first and second buffer amplifiers driving the second source line based on a value of display data driven by the first and second source lines;
Selecting the first buffer amplifier to drive the second source line if the values of the display data driven by the first and second source lines are the same;
Different values of the display data to be driving the phase by said first and second source lines, according to; and a step of selecting the second buffer amplifier to drive the second source line Item 72. The driving method according to Item 71 . If it is selected for the first buffer amplifier is driving the second source line, the method comprising: driving said first buffer amplifier Therefore the second source line,
If it is selected for the second buffer amplifier is driving the second source line, the method comprising driving said the second buffer amplifier Therefore the second source line, to claim 74, characterized in that it comprises The driving method described. In a system for driving the first and second source lines of a display panel,
First and second buffer amplifiers;
Means for selecting one of the first and second buffer amplifiers driving the second source line if the values of the display data driven by the first and second source lines are the same. ,
The driving system further comprising means for disabling the second buffer amplifier if the first buffer amplifier is selected to drive the second source line. 77. The driving system of claim 76 , wherein the first and second source lines are for the same pixel of the display device. The driving system of claim 76 , wherein the first and second source lines are for different pixels of the display device. Means for selecting one of the first and second buffer amplifiers driving the second source line based on a value of display data driven by the first and second source lines;
Means for selecting the first buffer amplifier to drive the second source line if the values of the display data driven by the first and second source lines are the same;
Different values of the display data to be driving the phase by said first and second source lines, claims, characterized in that it comprises means for selecting the second buffer amplifier to drive the second source line Item 76. The driving system according to Item 76 . If it is selected for the first buffer amplifier is driving the second source line, and means for driving said to result the second source line first buffer amplifier,
If it is selected for the second buffer amplifier is driving the second source line, according to claim 79, characterized by further comprising a means for driving said in the second buffer amplifier Therefore the second source line The driving system described in 1. A display panel;
A data comparison circuit for comparing display data values;
A plurality of source line drivers for receiving the display data and driving a source line of a display device based on the received display data;
If the comparison results of the display data values are the same, the data comparison circuit and the plurality of source line drivers are used to selectively connect different source lines of the display device to each of the plurality of source line drivers. A source line switching network responsive to
The plurality of source line drivers are:
If the comparison results of the display data values are the same, the display device responds to the data comparison circuit to selectively deactivate each of the plurality of source line drivers. The source line switching network is:
The display apparatus of claim 81 , wherein a deactivated one of the plurality of source line drivers is separated from the source line of the display apparatus. If the data comparison circuit determines that the display data values corresponding to two source lines are the same, the source line switching network connects one source line driver to the two source lines of the display device. 82. A display device according to claim 81 . The display device of claim 81 , wherein the display panel is a liquid crystal display device panel. The display apparatus of claim 81 , wherein the display panel is an organic light diffusing apparatus. In a buffer circuit that receives hue data and controls the hue of the corresponding panel cell,
At least one first source line driver circuit that receives the first hue data and controls the hue of the corresponding cell;
At least one second source line driver circuit that receives the second hue data and controls the hue of the corresponding cell;
The at least one first source line driver circuit includes first to nth buffers therein, and the at least one second source line driver circuit includes n + 1th to second n buffers therein.
If the first hue data and the second hue data are the same, some buffer amplifiers of the first to second n buffers are turned on, and the remaining buffer amplifiers are turned off.
The turned on buffer amplifier is:
A source line driver circuit for simultaneously controlling hues of cells corresponding to the first source line driver circuit and the second source line driver circuit. N is 3;
If the first hue data and the second hue data are the same, the odd-numbered buffer amplifiers of the first to second n buffer amplifiers are turned on, and the even-numbered buffer amplifiers are turned off.
The first hue data and the second hue data are respectively
Including R channel data, G channel data and B channel data,
87. The source line driver circuit according to claim 86 , wherein cells to which the first hue data and the second hue data are applied are adjacent to each other. The first source line driver circuit includes:
The first R channel data, the first G channel data, and the first B channel data of the first hue data are received and decoded, and the corresponding first R analog value, first G analog value, and first B analog value are output. A 1R decoding unit, a first G decoding unit, and a first B decoding unit;
Wherein said 1R analog value, the first 1G analog value and the second 1B analog value and outputs the buffered respectively, if the comparison result is identical with the first operation control signal and the second operation control signal, turned on or off A first R buffer amplifier, a first G buffer amplifier and a first B buffer amplifier,
If the comparison result is identical with the first connection control signal and the second connection control signal, wherein the 1R buffer amplifier, said first 1G buffer amplifier and the 1R output lines corresponding respectively to the output terminals of the first 1B buffer amplifier, A first R switch that connects or disconnects the first G output line and the first B output line, a first G switch, and a first B switch;
The second controller is
Second R channel data, second G channel data, and second B channel data of the second hue data are received and decoded, and corresponding second R analog values, second G analog values, and second B analog values are output. A 2R decoding unit, a second G decoding unit, and a second B decoding unit;
Wherein the 2R analog value, the second 2G analog value and the second 2B analog value and outputs each buffered, if the first operation control signal and the comparison result by the second operation control signal are the same, turn Or a second R buffer amplifier, a second G buffer amplifier and a second B buffer amplifier which are turned off;
If the comparison result is identical with the first connection control signal and the second connection control signal, wherein the 2R buffer amplifier, wherein the 2G buffer amplifier and an output terminal and the corresponding second 2R output of the first 2B buffer amplifier A second R switch, a second G switch and a second B switch for connecting or disconnecting the line, the second G output line and the second B output line,
The output terminal of the first R buffer amplifier and the second R output line are connected or disconnected by a first selection switch,
The first G output line and the output line of the second G buffer are connected or disconnected by a second selection switch,
The output terminal of the first B buffer and the second B output line are connected or disconnected by a third selection switch,
Said first selection switch, the second selection switch and the third selection switch, a source line driver circuit of claim 87, wherein a comparison result by the selection control signal is controlled when the same. If the first hue data and the second hue data are the same, the first operation control signal is activated to turn on the first R buffer amplifier, the first B buffer amplifier, and the second G buffer amplifier. The second operation control signal is deactivated to turn off the first G buffer amplifier, the second R buffer amplifier, and the second B buffer amplifier;
If the first hue data and the second hue data are different, both the first operation control signal and the second operation control signal are activated to turn on all the buffer amplifiers. 90. A source line driver circuit according to claim 88 . If the first hue data and the second hue data are the same, the first connection control signal is activated to connect the first R switch, the first B switch, and the second G switch, and 2 connection control signal is deactivated to cut off the first G switch, the second R switch and the second B switch,
If the first hue data and the second hue data are different from each other, the first connection control signal and the second connection control signal are both activated, and the first R switch, the first G switch, and the first B 90. The source line driver circuit according to claim 89 , wherein a switch, the second R switch, the second G switch, and the second B switch are connected. If the first hue data and the second hue data are the same, the selection control signal is activated to connect the first selection switch, the second selection switch, and the third selection switch,
If the first hue data and the second hue data are different, the selection control signal is deactivated to block the first selection switch, the second selection switch, and the third selection switch. 90. A source line driver circuit according to claim 89 , wherein: A probe chip for testing the buffer is connected to some of the first R output line, the first G output line, the first B output line, the second R output line, the second G output line, and the second B output line,
90. The source line driver circuit of claim 88 , wherein all the buffers are tested by alternately activating the selection control signal and the second connection control signal. If the comparison result by the second operation control signal is the same, the probe tip is connected to the output line corresponding to the buffer amplifier to be controlled,
If the selection control signal is activated and the second connection control signal is deactivated, a buffer amplifier to be controlled is tested if the comparison result by the first operation control signal is the same;
If the selection control signal is deactivated and the second connection control signal is activated, the controlled buffer amplifier is tested if the comparison result by the second operation control signal is the same. 94. A source line driver circuit according to claim 92.   94. The source line driver circuit of claim 93, further comprising a control logic that receives a control signal from an external test apparatus and controls the selection control signal and the second connection control signal in a test mode. .   If the result of comparing whether the first and second hue data are the same and the comparison result by the operation signal, the connection signal, and the selection signal are the same, the first and second operation control signals, the first The source line driver circuit of claim 86, further comprising a data comparison circuit that generates the second connection control signal and the selection control signal.

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