KR101010488B1 - Liquid crystal display device - Google Patents

Abstract

The present invention provides a liquid crystal display device for increasing the contrast ratio of an image. The liquid crystal display device according to the present invention includes a display panel on which an image is displayed, a plurality of data lines and gate lines arranged vertically and horizontally on the display panel, and the display panel. A plurality of tape carrier packages electrically connected to each other, a printed circuit board having a first bit control unit for supplying image information of a first bit to the tape carrier package, and at least one bit by logically combining image information of the first bit A value generator, and an OR gate performing an OR operation on the image information of the first bit, an AND gate performing an AND operation on the image information of the first bit, and a selection unit configured to select and output an output of the OR gate and the AND gate. A first bit from the printed circuit board, Second bit data receiving image information, receiving a bit value from the data processing unit, adding the bit value to the image information of the first bit, converting the bit value into an analog signal, and applying the bit value to data lines of the display panel. It includes a drive unit.

Contrast Ratio, And Gate, OA Gate, Bit, Luminance

Description

[0001] LIQUID CRYSTAL DISPLAY DEVICE [0002]

1 is an exemplary view showing a general liquid crystal display device.

2 shows an 8-bit data tape carrier package to which 6-bit image information is applied.

3 is a logic table showing 8-bit image information input to the data driving integrated circuit of FIG.

4 is a view showing a liquid crystal display device according to a first embodiment of the present invention.

5A is a logical table in the case where the data processing unit according to the present invention is composed of a logical AND combination.

Fig. 5B is a logical table in the case where the data processing unit according to the present invention is composed of a logical sum combination.

6 is a view showing a liquid crystal display device according to a second embodiment of the present invention.

*** Explanation of symbols for the main parts of the drawing ***

231: data printed circuit board 232: data tape carrier package

233: data driving integrated circuit 260: data processing unit

IN1 'to IN8': Input pin OUT1 'to OUTm': Output pin

B0 ', B1': Lower 2-bit value B2 'to B7': Image information of the first bit

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal display device, and more particularly, to a liquid crystal display device in which image contrast is improved by increasing an image contrast ratio.

Recently, the importance of the display (display) in the information society as a visual information transmission medium is further emphasized, and in order to occupy a major position in the future, it is necessary to meet the requirements of low power consumption, thinning, light weight, high quality.

The display itself is a cathode ray tube (CRT), an electroluminescent element (EL), a light emitting diode (LED), a vacuum fluorescence display (VFD), an electric field It can be divided into emission type such as Field Emission Display (FED), Plasma Display Panel (PDP) and non-emission type such as Liquid Crystal Display (LCD). .

A liquid crystal display device displays an image by using optical anisotropy of liquid crystal. Plasma display panel or electric field is not only small compared with conventional CRT tubes, but also smaller than CRT tubes having the same average power consumption. Along with the emission display, it is recently attracting attention as a next generation display device.

The liquid crystal used in the liquid crystal display device is not a light emitting material that emits light, but is a light-sensitive material that modulates the amount of light coming from the outside and displays it on the screen. It requires a light source, ie a lamp unit.

In general, a liquid crystal display device is a display device in which an image correcting signal is individually supplied to pixels arranged in a matrix, so that a desired image can be displayed by adjusting light transmittance of the pixels.

The liquid crystal display as described above will be described in detail with reference to the accompanying drawings.

FIG. 1 is a diagram illustrating a general liquid crystal display device. As shown in FIG. 1, a liquid crystal display device is connected between the liquid crystal display panel 10 and one side of the liquid crystal display panel 10 and the gate printed circuit board 21. Gate carrier integrated circuits (TCP, 22) and gate driving integrated circuits 23 mounted on the gate tape carrier packages 22 and one long side and data of one side of the liquid crystal display panel 10, respectively. Data tape carrier packages 32 connected between printed circuit boards 31 and data driving integrated circuits 33 mounted on the data tape carrier packages 32 are respectively provided.

The liquid crystal display panel 10 is bonded to face the thin film transistor array substrate 11 and the color filter substrate 12 so as to have a constant cell gap, and a liquid crystal layer is formed in the cell gap.

One short side and one long side of the thin film transistor array substrate 11 protrude from the color filter substrate 12, and the gate pad portion and the data pad portion are provided in the protruding region of the thin film transistor array substrate 11. In addition, an image display unit 13 in which an image is actually displayed is provided in an area where the thin film transistor array substrate 11 and the color filter substrate 12 face each other.

In the image display part 13 of the thin film transistor array substrate 11, a plurality of gate lines 20 are arranged in a horizontal direction and connected to the gate pad part, and a plurality of data lines 30 are arranged in a vertical direction. It is connected to the data pad part. The gate lines 20 and the data lines 30 cross each other, and pixels having a thin film transistor and a pixel electrode are formed at the intersection thereof.

The image display unit 13 of the color filter substrate 12 includes a red, green, and blue color filter separated and applied to each pixel by a black matrix and a pixel electrode provided in the thin film transistor array substrate 11. A common electrode for forming an electric field in the layer is provided.

Gate drive integrated circuits 23 are mounted on the gate tape carrier package 22, and input pads 24 and output pads 25 electrically connected to the gate drive integrated circuits 23 are formed.

The input pads 24 of the gate tape carrier package 22 are electrically connected to the gate printed circuit board 21, and the output pads 25 are electrically connected to the gate pad portion of the thin film transistor array substrate 11. .

The gate driving integrated circuits 23 sequentially supply scan signals to the gate lines 20 of the liquid crystal display panel 10.                         

Meanwhile, data driving integrated circuits 33 are mounted on the data tape carrier package 32, and input pads 34 and output pads 35 electrically connected to the data driving integrated circuits 33 are formed. do.

The input pads 34 of the data tape carrier package 32 are electrically connected to the data printed circuit board 31, and the output pads 35 are electrically connected to the data pad portion of the thin film transistor array substrate 11. .

The data driving integrated circuits 33 convert image information, which is a digital signal, into an analog signal and supply the converted data to the data lines 30 of the liquid crystal display panel 10.

Connectors 26 and 36 are formed on the gate printed circuit board 21 and the data printed circuit board 31, respectively, and are controlled through a flexible printed circuit (FPC) 50 or other cable. Signals and driving voltages are supplied.

Although not shown, the liquid crystal display includes a timing controller (not shown) and a power supply unit (not shown). When external image information is supplied to the timing controller, the timing controller forms various control signals for driving the liquid crystal display according to the supplied image information. The power supply unit receives external power to form various driving voltages used in the liquid crystal display.

The timing controller supplies various control signals to the gate driving integrated circuit 23, and supplies image information and control signals to the data driving integrated circuit 33. In addition, various driving voltages formed by the power supply unit are also applied to the data driving integrated circuit 33 and the gate driving integrated circuit 23. In general, since the 6-bit digital image information is used in the case of a notebook, the 6-bit timing control unit is applied, and in the case of a monitor or a television, the 8-bit timing is used because the 8-bit digital image information is used. The control is applied.

Since monitors and televisions have been used and developed for a relatively long time, various specifications of 8-bit data driving integrated circuits for processing 8-bit image information have been manufactured. By the way, when 6-bit image information is applied through the 6-bit timing controller, a 6-bit data driver integrated circuit must be used. However, 6-bit data driver integrated circuits have not yet come in various standard products. In addition, when there is no data driver integrated circuit of the exact corresponding standard, new development is required, and a considerable time and effort must be invested. Therefore, when the 6-bit timing controller is applied, the structure of the liquid crystal display device such as a data tape carrier package is changed to use the existing 8-bit data driver integrated circuit.

On the other hand, the timing control unit is usually manufactured and used as an integrated circuit such as an application specific integrated circuit (ASIC).

The structure of the data tape carrier package applied when the 6-bit image information is processed by the 8-bit data driver integrated circuit as described above will be described with reference to the accompanying drawings.

2 is a diagram illustrating an 8-bit data tape carrier package to which 6-bit image information is applied.

2, a data tape carrier package 132 is electrically connected to a data printed circuit board 131. The data driving integrated circuit 133 is mounted on the data tape carrier package 132, and the data printed circuit board 131 transmits image information to the data driving integrated circuit 133 through the data tape carrier package 132. ) Is applied.

However, since the image information supplied from the data printed circuit board 131 to the data driver integrated circuit 133 is 6-bit image information, eight inputs included in the 8-bit data driver integrated circuit 133 are provided. It is not necessary to use all of the pins IN1 to IN8.

As illustrated, the input pins IN1 to IN8 of the data driving integrated circuit 133 are eight, and the output pins OUT1 to OUTn are plural. Since 8-bit image information must be input through the input pins IN1 to IN8, 6-bit image information must be supplied through the input pins IN1 to IN8, and 2-bit data must be further supplied. do. Accordingly, the image information is input to the six input pins IN3 to IN8 of the input pins IN1 to IN8, and the wires connected to the remaining two input pins IN1 and IN2 are electrically connected to each other and shorted. As such, a high voltage or a low voltage is equally applied to the shorted lines.

The wires connected to the two input pins IN1 and IN2 may be connected to each other on the data printed circuit board 131 and short-circuited. Here, the important thing is to short-circuit the two wirings and apply a voltage of the same potential.

As described above, the data driving integrated circuit 133 to which the image information is applied outputs the image information through the plurality of output pins OUT1 to OUTn. At this time, the signals output from the lower 2 bits (B0, B1) are the same voltage signal of low potential or high potential, and the signals output through the remaining bits B2 to B7 except the lower 2 bits are the original 6-bit image. Information. That is, since the liquid crystal display device is driven by the image information output from the data driver integrated circuit 133, the data driver integrated circuit 133 has a 2-bit arbitrarily set a potential to the original 6-bit image information. Signal is applied and output as image information having a plurality of bits. In this case, the number of output pins OUT1 to OUTn provided in the data driving integrated circuit 133 is generally standardized, such as 384, 420, and 480, and a suitable model is formed according to the resolution of the liquid crystal display device. Optionally use

FIG. 3 is a logic table showing 8-bit image information input to the data driver integrated circuit of FIG. 2.

Referring to FIG. 3, 6-bit image information B2 to B7 is input to the data driving integrated circuit, and lower two-bit values B0 and B1 are additionally input.

As the 6-bit image information input to the data driver integrated circuit, all 64 gradations can be displayed. As shown, image information corresponding to each gray scale is shown. Here, the image information values are expressed as '0' and '1', where '1' indicates a high potential voltage and '0' indicates a low potential voltage.

Meanwhile, as described above, the lower 2-bit values B0 and B1 are arbitrarily set to correspond to the 6-bit image information to the input pins of the 8-bit data driving integrated circuit, and are input to the data driving integrated circuit. Low and high potential voltages are equally applied. The lower 2-bit values B0 and B1 may display an image having a desired characteristic by selecting one of a low potential voltage and a high potential voltage.

Usually, the liquid crystal display device is mainly a twisted nematic (TN) type liquid crystal display device, and will be described with reference to the twisted nematic liquid crystal display device in FIG. The liquid crystal display has a normally black mode indicating a black luminance state in which no light transmission is applied when no electric field is applied, and the light transmittance is increased to increase brightness as an increasing electric field is applied. .

On the other hand, the ratio of the white luminance to the black luminance is called a contrast ratio (CR). When the black luminance value is increased in the image displayed on the screen, the image is displayed clearly and the contrast ratio is increased.

Such brightness and contrast ratio are in mutual relation with each other, and if one is increased, the contrast ratio and brightness should be appropriately adjusted for the best image quality so that the other is lowered.

The lower two-bit values B0 and B1 can be set arbitrarily. That is, by applying a low potential voltage or a high potential voltage as intended, the above-described brightness and contrast ratio characteristics can be obtained. When the lower two-bit values B0 and B1 are applied as the low potential voltage as shown in FIG. 3, the lower two-bit values B0 and B1 are all set to '00', thereby reducing the value of the image information as a whole. The light transmittance of the liquid crystal display is lowered, and the contrast ratio is improved. On the other hand, when the lower two-bit values B0 and B1 are applied at high potential, the overall light transmittance is increased, thereby improving the brightness of the image.                         

This characteristic can be used to selectively display an image with emphasis on contrast ratio or brightness.

However, when the lower two-bit values B0 and B1 are applied at a high potential as described above, the upper six-bit image information B2 to B7 representing the lowest gray scale ('000000') is displayed in a state where there is no light transmittance. Should be displayed only in black, but in reality, the lower two-bit values B0 and B1 are output as '11', so they are displayed as a grayish black image. In other words, it is impossible to display the correct minimum gradation state and the contrast ratio is lowered. In addition, when the lower two-bit values B0 and B1 are applied at low potential, the upper six-bit image information B2 to B7 outputs the lowest gray scale ('000000'), and the lower two-bit value B0. , B1) also outputs '00' so that a black screen can be displayed accurately. However, even when the upper six-bit image information B2 to B7 outputs the highest gray scale ('111111'), the lower two-bit values B0 and B1 output '00', so that the image having the brightest brightness is obtained. It becomes impossible to express and the contrast falls. That is, since the lower 2-bit values B0 and B1 are fixed to one of the low potential and the high potential, the contrast ratio of the liquid crystal display may be reduced even when applied to either the low potential or the high potential. .

Accordingly, the present invention has been devised to solve the above-described problems, and an object of the present invention is to reduce contrast ratio generated when an 8-bit data driving integrated circuit is designed and used in response to 6-bit image information. The present invention provides a liquid crystal display device which prevents the phenomenon and improves image quality.

According to an aspect of the present invention, a liquid crystal display device includes a display panel on which an image is displayed, a plurality of data lines and gate lines arranged vertically and horizontally on the display panel, and a plurality of tape carrier packages electrically connected to the display panel. And a printed circuit board having a first bit control unit for supplying image information of a first bit to the tape carrier package, and generating at least one bit value by logically combining the image information of the first bit. A data processing unit and a tape carrier package including an OR gate for performing an OR operation on the image information of an AND, an AND gate for performing an AND operation on the image information of the first bit, and a selection unit for selecting and outputting the outputs of the OR gate and the AND gate. Is mounted, receives the first bit image information from the printed circuit board, the data And a second bit data driver for receiving the bit value from the processor and adding the bit value to the image information of the first bit, converting the bit value into an analog signal, and applying the bit value to the data lines of the display panel.
The first bit is 6-bit and the second bit is 8-bit.
The bit value is added as the lower two bits to the image information of the first bit.
The data processor is provided on the printed circuit board.
The data processor is provided in the tape carrier package.
In addition, a liquid crystal display device according to another embodiment of the present invention is a display panel for displaying an image, a plurality of tape carrier package electrically connected to the display panel, printing for supplying the first bit of image information to the tape carrier package A circuit board, a plurality of first data input lines mounted on the tape carrier package to receive image information of a first bit from the printed circuit board, and selectively connected to any one of the first data input lines. The second data input line is mounted on the tape carrier package and receives image information of a first bit from the first data input lines, and receives a bit value from the second data input line. A second bit added to the display panel after adding the bit value to the image information of And a data driver.
Two input pins which receive the lower two bits of the second bit data driver are electrically connected to each other.
The input pin is electrically connected to the second data input line.

The liquid crystal display as described above will be described in detail with reference to the accompanying drawings.

4 is a view showing a liquid crystal display device according to a first embodiment of the present invention.

Although not shown in the drawings, the liquid crystal display includes a liquid crystal panel in which a thin film transistor array substrate and a color filter substrate facing each other have a fixed cell gap, and a data tape carrier package 232 electrically connected to the liquid crystal panel. And a data printed circuit board 231 having a timing controller for supplying first bit image information B2 'to B7' to the data tape carrier package 232 and the first bit image information B2 'to B7. A data processor 260 for generating a 2-bit value by logically combining '); Is mounted on the data tape carrier package 232, receives the first bit image information (B2 '~ B7') from the data printed circuit board 231, receives the bit values from the data processing unit 260 And a data driving integrated circuit 233 for converting data having bit values added to lower 2-bits into the first bit image information B2 'to B7' into an analog signal and outputting the analog signal to the liquid crystal panel.

In general, the liquid crystal display is supplied with external data in digital form. The external data is supplied to the timing controller, and in response to the external data, various control signals for driving the liquid crystal display are generated. The timing controller supplies first bit image information B2 'to B7' to the data driving integrated circuits 233, and various control signals are provided to the gate driving integrated circuit and the data driving integrated circuits 233. FIG. Supply.

The timing controller is usually provided in the data printed circuit board 231, and the data printed circuit board 231 is electrically connected to the data tape carrier packages 232, and controls various control signals in the timing controller. The first bit image information B2 'to B7' outputted in synchronization is applied to the data driving integrated circuit 233 mounted on the data tape carrier package 232. The timing controller is a 6-bit timing controller, and the first bit of image information B2 'to B7' having 6-bits outputted from the 6-bit timing controller is an 8-bit data driver integrated circuit ( 233). In this case, 2-bit data must be additionally supplied to the 8-bit data driver integrated circuit 233 in order to have an 8-bit input to the 8-bit data driver integrated circuit 233.

As described above, 2-bit data additionally input to the data driving integrated circuit 233 is generated through the first bit of image information B2 'to B7'.

The data driving integrated circuit 233 is a 2-field generated by the first bit of image information B2 'to B7' having 6-bits and the first bit of image information B2 'to B7'. Receives the bit values B0 'and B1' through the input pins IN1 'to IN8', and adds the 2-bit value as the lower 2-bits of the first bit of image information B2 'to B7'. To produce a total of 8 bits of data. Such 8-bit data is digital-analog converted in the data driving integrated circuit 233 and output to the data lines through output pins OUT1 'to OUTm' as analog image information, respectively. As described above, in the data driving integrated circuit 233, 2-bit generated according to the first bit of image information B2 'to B7' consisting of 6-bits and the first bit of image information B2 'to B7'. The total value (B0 ', B1') is input and the total 8-bit image accuracy is input and processed according to the resolution of the screen.

In this case, the first bit of image information B2 'to B7' is data containing an actual image, and is added as the lower two bits of the first bit of image information B2 'to B7'. The 2-bit values B0 'and B1' are functional auxiliary data for increasing the contrast ratio or luminance of the first bit of image information B2 'to B7'.

In general, the data driving integrated circuit 233 receives digital image information through input pins IN1 'to IN8' and is used to drive the liquid crystal display in a digital-to-analog converter (not shown) provided therein. Converts to analog image information. The analog image information is output to the data lines through the plurality of output pins OUT1 'to OUTm'.

The number of output pins OUT1 'to OUTm' of the data driving integrated circuit 233 varies depending on the model. That is, since various data driver integrated circuits 233 such as 384, 420, and 480 are manufactured, they may be selectively used according to the resolution of the liquid crystal display device. For example, the above 6-bit first bit image information B2 'to B7' is applied to the data driving integrated circuit 233, and the number of output pins OUT1 'to OUTm' is 384. In this case, image information having 64 gray levels is output through the 384 output pins OUT1 'to OUTm'.

Meanwhile, as shown in the drawing, the first bit of image information B2 'to B7' supplied from the data printed circuit board 231 to the data driving integrated circuit 233 is the data driving integrated circuit 233. ) Is applied to the data processing unit 260.

The data processor 260 generates at least one bit value by logically combining the first bit image information B2 'to B7', and integrates the data driving through the input pins IN1 'and IN2'. To the circuit 233.

Conventionally, bit values set to have any one of a high potential voltage or a low potential voltage irrespective of the first bit image information B2 'to B7' are 2-bits in the data driving integrated circuit 233. Although supplied as the values B0 'and B1', in the present invention, the 2-bit values B0 'and B1' are determined according to the first bit of image information B2 'to B7' and the data driving integrated circuit is determined. It is characterized in that it is supplied to 233.                     

On the other hand, the data processor 260 is composed of an AND-gate or an OR-GATE. These AND gates and oragates logically combine the first bit of image information B2 'to B7' to generate 2-bit values B0 'and B1'. That is, when the first bit of picture information B2 'to B7' is applied to the AND gate, the second bit except when all bits of the first bit of picture information B2 'to B7' are high potential. The bit values B0 'and B1' both have a low potential. In addition, when the first bit of picture information B2 'to B7' is applied to an oragate, the second bit except when all bits of the first bit of picture information B2 'to B7' are low potential. The bit values B0 'and B1' all have high potentials.

The data processor 260 may be configured only with an end gate or an or gate, but may include both. In this case, however, a separate selection unit may be provided in the data processing unit 260 to selectively output one of the output of the AND gate and the output of the OR gate.

The data processor 260 may be formed on the data tape carrier package of the liquid crystal display device or on the data printed circuit board 231.

Referring to the driving of the data processing unit 260 configured as described above in detail through a logic table as follows.

FIG. 5A is a logical table in the case where the data processing unit according to the present invention is configured by the logical AND combination, and FIG. 5B is a logical table in the case where the data processing unit according to the present invention is configured by the logical OR combination.

Referring to FIG. 5A, the first bit of image information B2 'to B7' is data having a 6-bit value, and a total of 64 gradation images can be displayed on the screen. When the first bit of image information B2 'to B7' is applied to the AND gate of the data processor 260, AND-operated 2-bit values B0 'and B1' are generated. When all the bit values of the first bit of image information B2 'to B7' are high potential '1', all of the 2-bit values B0 'and B1' are also output at high potential '1'. When all bit values of the first bit of image information B2 'to B7' have values other than the high potential ('1'), the 2-bit values B0 'and B1' are all low potential ('0'). Is output.

On the other hand, as shown in FIG. 5B, when the first bit of image information B2 'to B7' is applied to an orifice of the data processing unit 260, a 2-bit value B0 that is OR-calculated. ', B1') is generated. When all the bit values of the first bit of image information B2 'to B7' are low potential '0', all of the 2-bit values B0 'and B1' are also low potential. 2-bit values B0 'and B1' when all bit values of the first bit of image information B2 'to B7' have values other than the low potential ('0'). Are also output at high potential ('1').

As described above, the bit value of the second bit image information B0 ', B1 generated through the logical combination of the AND gate or the oragate indicates that the first bit image information B2' to B7 'has a halftone. In the section shown, different bit values are obtained. However, when the first bit image information B2 'to B7' indicates the lowest gray scale ('000000') or the highest gray scale ('111111'), the two-bit values B0 'and B1' are also commonly used. The first bit has the same value as the bit values of the image information B2 'to B7'.                     

Therefore, the 2-bit value B0 when the first bit of image information B2 'to B7' represents the lowest gray scale ('000000') or the highest gray scale ('111111') regardless of the AND operation or the OR operation. ', B1' can accurately implement the lowest grayscale image and the highest grayscale image of the first bit of image information B2 'to B7'.

On the other hand, when determining the 2-bit values (B0 ', B1) through the AND-OR combination as described above, the contrast ratio can be highlighted by displaying the intermediate tones except for the lowest and highest grayscales of the image. In addition, the luminance can be emphasized and displayed. That is, in the case of expressing the intermediate gray level through a logical sum combination, since the 2-bit values B0 'and B1' show high potentials in all the gray levels except the lowest gray level, the first bit of image information B2 'to B7'. The overall contrast ratio can be increased, and in the case of expressing the intermediate gray level through a logical product combination, the 2-bit values B0 'and B1' exhibit low potential in all the gray levels except the highest gray level, so that the first bit of image information The overall luminance of (B2 'to B7') can be increased.

That is, when the first bit image information (B2 'to B7') shows the lowest grayscale and the highest grayscale regardless of the logical sum combination or the logical AND combination, the white or black luminance can be accurately displayed on the screen. The contrast ratio of the display device is improved.

The liquid crystal display device according to the first embodiment as described above is provided with a data processing unit including a logical sum combination or a logical multiplication combination, and the data processing unit uses the first bit of image information (B2 'to B7') to display the 2-bit. Bit values B0 'and B1' are determined and output. However, since the data processing unit is formed on the data tape carrier package or the data printed circuit board, the data processing unit occupies a certain area and increases the manufacturing cost. In particular, since each data driving integrated circuit must be provided separately, manufacturing cost increases. Therefore, although the data processing unit is removed, the second embodiment can be devised to obtain the same effect as the first embodiment.

6 is a view showing a liquid crystal display according to a second embodiment of the present invention.

Referring to FIG. 6, a data printed circuit board 331 for receiving various first control signal and driving voltages by receiving image information B2 ′ through B7 ′ having first six bits, and the data printed circuit board. Data tape carrier package 332 electrically connected to 331, mounted on the data tape carrier package 332, and the first bit of image information (B2 'to B7') from the data printed circuit board 331. ) Is configured to include a data driving integrated circuit 333 that is applied to the digital-analog conversion and output to the data lines.

The data tape carrier package 332 is not provided with a data processor. The second embodiment is a liquid crystal display device in which a data processing unit is removed, and a plurality of first data input lines 370 for applying first bit image information B2 'to B7' to the data driving integrated circuit 333. ) And the second data input line 371 which electrically applies the 2-bit values B0 'and B1' to the data driving integrated circuit 333, thereby electrically connecting the 2-bit values B0 'and B1. ') Is generated.

In more detail, the first data input line 370 in which the first bit image information B2 'to B7' having 6-bits from the data printed circuit board 331 is formed on the data tape carrier package 332. The first bit image information B2 'to B7' is input to the data driving integrated circuit 333 through the first data input line 370, and the first data input line One bit value is commonly applied to the lower two-bit values B0 'and B1' through a second data input line 371 that is selectively connected to 370.

That is, the second data input line 371 is selectively connected to any one of the first data input lines 370, and also receives two input pins IN1 ′ and IN2 ′ that receive the lower two bits. Is commonly connected to. Thus, the driving of the configured liquid crystal display device is as follows.

When the first bit of image information B2 'to B7' has bit values indicating the lowest gray level, first, the first bit of image information B2 'to B7' is data as upper 6-bit data. Applied to the driving integrated circuit 333. In addition, a bit value indicating the lowest gray level is applied to the second data input line 371 connected to the first data input line 370, and is applied to the data driving integrated circuit 333 in the lower two bits. Therefore, the first bit of image information B2 'to B7' and the 2-bit values B0 'and B1' applied to the data driving integrated circuit 333 are all bit values indicating the lowest gray scale.

In addition, when bit values representing the highest gray level are applied to the data driving integrated circuit 333 through the first data input line 370, second data input selectively connected to the first data input line 370. A bit value indicating the highest gradation is applied to the line 371 and is applied to the data driving integrated circuit 333 as 2-bit values B0 'and B1' indicating lower two bits. Therefore, the first bit of image information B2 'to B7' and the 2-bit values B0 'and B1' are all made up of bit values representing the highest gray scale.

As described above, when the bit values of the first bit image information B2 'to B7' all have a low potential voltage or a high voltage voltage, that is, have a bit value indicating the lowest or highest gray level, the second data. Since the input line 371 receives a bit value having the same potential even if the input line 371 is selectively connected to any of the first data input lines 370, the total of 8-bit data is the same high potential voltage or the low potential voltage. Applied to a data driving integrated circuit. Therefore, the liquid crystal display device can display an accurate black image or a white image.

As described above, the liquid crystal display according to the present invention additionally generates, in addition to the 6-bit image information input to the data driving integrated circuit, in applying image information having 6-bit to the 8-bit data driving integrated circuit. The image quality of the liquid crystal display device can be improved by forming 2-bit image information so as to increase the contrast ratio of the lowest grayscale image or the highest grayscale image of the 6-bit image information.

Claims (10)

A display panel on which an image is displayed; A plurality of data lines and gate lines arranged vertically and horizontally on the display panel; A plurality of tape carrier packages electrically connected to the display panel; A printed circuit board having a first bit controller configured to supply image information of a first bit to the tape carrier package; At least one bit value is generated by logically combining the image information of the first bit, an OR gate for performing an OR operation on the image information of the first bit, and an AND gate for performing an AND operation on the image information of the first bit. A data processor including a selector configured to select and output an output of an OR gate and an AND gate; And The tape carrier package is mounted on the tape carrier package, receives image information of a first bit from the printed circuit board, receives a bit value from the data processor, and adds the bit value to the image information of the first bit. And a second bit data driver for converting the data bits to the data lines of the display panel. The liquid crystal display of claim 1, wherein the first bit is 6-bit and the second bit is 8-bit. The liquid crystal display device according to claim 1, wherein the bit value is added as two lower bits to the image information of the first bit. The liquid crystal display of claim 1, wherein the data processor is provided on the printed circuit board. The liquid crystal display of claim 1, wherein the data processor is provided in the tape carrier package. A display panel on which an image is displayed; A plurality of tape carrier packages electrically connected to the display panel; A printed circuit board supplying image information of a first bit to the tape carrier package; A plurality of first data input lines mounted on the tape carrier package to receive first bit image information from the printed circuit board; A second data input line selectively connected to any one of the first data input lines to receive a bit value; The tape carrier package is mounted on the tape carrier package and receives image information of a first bit from the first data input lines, receives a bit value from the second data input line, and applies the bit value to the image information of the first bit. And a second bit data driver for converting the analog signal into an analog signal and applying it to the display panel. The liquid crystal display of claim 6, wherein two input pins that receive the lower two bits of the second data driver for the second bit are electrically connected to each other. The method of claim 7, wherein And the input pin is electrically connected to the second data input line. delete delete

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