KR20060019818A - Device for converting data for display device - Google Patents

Abstract

The present invention relates to a data conversion device for a display device, the device comprising: an input unit for receiving input data including first and second image data and first to third selection data from the outside; And a first multiplexer which selects any one of the second image data and exports it as the first color data, and a second multiplexer selects one of the first and second image data and exports the second color data according to the second selection data. A firearm, a third multiplexer which selects any one of the first and second image data according to the third selection data and exports it as the third color data, and an output unit which outputs the output image data composed of the first to third color data. do. According to the present invention, 10-bit image data can be generated by modifying the format of 8-bit image data, and accordingly, color characteristics of the 10-bit display apparatus can be evaluated using an 8-bit image signal source.

Data conversion device, display device, image data, data format, multiplexer, adder

Description

Data conversion device for display devices {DEVICE FOR CONVERTING DATA FOR DISPLAY DEVICE}

1 is a block diagram of a liquid crystal display device.

2 is a schematic diagram illustrating a data conversion device and a peripheral device according to an embodiment of the present invention.

3 is a diagram illustrating a data format of general image data and a data format according to an embodiment of the present invention.

4 is an example of a circuit diagram of a data conversion device according to an embodiment of the present invention.

The present invention relates to a data conversion device for a display device.

The display device includes a cathode ray tube, an organic light emitting display, a plasma display, a liquid crystal display, and the like.

Among them, a liquid crystal display (LCD) generally includes two display panels provided with a pixel electrode and a common electrode, and a liquid crystal layer having dielectric anisotropy interposed therebetween. The pixel electrodes are arranged in a matrix and connected to switching elements such as thin film transistors (TFTs) to receive data voltages one by one in sequence. The common electrode is formed over the entire surface of the display panel and receives a common voltage. The pixel electrode, the common electrode, and the liquid crystal layer therebetween form a liquid crystal capacitor, and the liquid crystal capacitor becomes a basic unit that forms a pixel together with a switching element connected thereto.

In such a liquid crystal display, a voltage is applied to two electrodes to generate an electric field in the liquid crystal layer, and the intensity of the electric field is adjusted to adjust the transmittance of light passing through the liquid crystal layer to obtain a desired image. In this case, in order to prevent degradation caused by an electric field applied to the liquid crystal layer for a long time, the polarity of the data voltage with respect to the common voltage is inverted frame by frame, row by pixel, or pixel by pixel.

Recently, liquid crystal displays for 10-bit image signals have been developed. However, almost all digital video signal sources only support 8-bit video signals, such as Windows-based PC systems that support only 8-bit video signal formats. Therefore, it is difficult to evaluate the color characteristics of the 10-bit liquid crystal display. It is also expensive and time-consuming to build a system that supports 10-bit video signals.

Accordingly, an aspect of the present invention is to provide a data conversion device for a display device that converts 8-bit data from an 8-bit image signal source into a 10-bit image signal.

According to an aspect of the present invention, there is provided an apparatus for converting data for an display device, including: an input unit configured to receive input data including first and second image data and first to third selection data from the outside; 1. A first multiplexer for selecting any one of the first and second image data and outputting the first color data according to selection data, and selecting one of the first and second image data according to the second selection data. A second multiplexer for exporting as second color data, a third multiplexer for selecting any one of the first and second image data according to the third selection data, and outputting the third color data; And an output unit for outputting output image data consisting of three color data.

According to another aspect of the present invention, an apparatus for converting data for a display device may include: an input unit configured to receive input image data including external input image data and first and second additional data, and add the first additional data to the input image data; A first adder for exporting as first color data, a second adder for adding the second additional data to the input image data, and exporting as second color data; and third color data comprising the input image data and the first and second And an output unit for outputting output image data composed of color data.

According to another exemplary embodiment of the present invention, a data conversion device for a display device includes: first input data or first and second image data including first and second image data and first to fourth selection data from the outside; An input unit configured to receive second input data including second additional data and the fourth selection data, and a first one of selecting one of the first and second image data according to the first selection data and outputting the first color data as first color data A multiplexer, a second multiplexer which selects one of the first and second image data according to the second selection data and exports it as second color data; and the first and second image data according to the third selection data A third multiplexer for selecting any one of the first color image data and exporting the first output image data including the first to third color data; A first adder that adds the first additional data to the first image data and exports it as fourth color data; a second adder that adds the second additional data to the first image data and exports it as fifth color data; and the first image data A second output unit configured to export the sixth color data and the second output image data including the fourth and fifth color data, and to export any one of the first and second output image data according to the fourth selection data. And a fourth multiplexer.

The first and second image data and the input image data may be 10 bits, and the first and second additional data may be 6 bits.

The first to sixth color data may be data representing one of three primary colors.

DETAILED DESCRIPTION Embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention.                     

First, a liquid crystal display device to which a data conversion device for a display device according to an exemplary embodiment of the present invention is applied will be described in detail with reference to FIG. 1.

1 is a block diagram of a liquid crystal display device.

As illustrated in FIG. 1, the liquid crystal display includes a liquid crystal panel assembly 300, a gate driver 400 connected thereto, a data driver 500, and a gray voltage generator connected to the data driver 500. 800, and a signal controller 600 for controlling them.

The liquid crystal panel assembly 300 includes a plurality of display signal lines G ₁ -G _n , D ₁ -D _m and a plurality of pixels connected to the plurality of display signal lines G ₁ -G _n , D ₁ -D _m , and arranged in a substantially matrix form. .

The display signal lines G ₁ -G _n and D ₁ -D _m are a plurality of gate lines G ₁ -G _n for transmitting a gate signal (also called a “scan signal”) and a data line D for transmitting a data signal. ₁ -D _m ). The gate lines G ₁ -G _n extend substantially in the row direction and are substantially parallel to each other, and the data lines D ₁ -D _m extend substantially in the column direction and are substantially parallel to each other.

Each pixel includes a switching element Q connected to a display signal line G ₁ -G _n , D ₁ -D _m , and a liquid crystal capacitor C _LC and a storage capacitor C _ST connected thereto. It includes. The holding capacitor C _ST can be omitted as necessary.

The gray voltage generator 800 generates two sets of gray voltages related to the transmittance of the pixel. One of the two sets has a positive value for the common voltage (V _com ) and the other set has a negative value.

The gate driver 400 is connected to the gate lines G ₁ -G _n of the liquid crystal panel assembly 300 to receive a gate signal formed by a combination of a gate on voltage V _on and a gate off voltage V _off from the outside. It is applied to the gate lines G ₁ -G _n .

The data driver 500 is connected to the data lines D ₁ -D _m of the liquid crystal panel assembly 300 to select the gray voltage from the gray voltage generator 800 and apply the gray voltage to the pixel as a data signal.

The gate driver 400 or the data driver 500 is mounted directly on the liquid crystal panel assembly 300 in the form of a plurality of driving integrated circuit chips, or mounted on a flexible printed circuit film (not shown). And may be attached to the liquid crystal panel assembly 300 in the form of a tape carrier package (TCP). Alternatively, the gate driver 400 or the data driver 500 may be integrated in the liquid crystal panel assembly 300.

The signal controller 600 controls operations of the gate driver 400 and the data driver 500.

Next, the display operation of the liquid crystal display will be described in more detail.

The signal controller 600 may control the input image signals R, G, and B and their display from an external graphic controller (not shown), for example, a vertical sync signal V _sync and a horizontal sync signal. (H _sync ), a main clock (MCLK), a data enable signal (DE) is provided. The signal controller 600 properly processes the image signals R, G, and B according to the operating conditions of the liquid crystal panel assembly 300 based on the input image signals R, G, and B and the input control signal, and controls the gate control signal. After generating the CONT1 and the data control signal CONT2, the gate control signal CONT1 is sent to the gate driver 400, and the data control signal CONT2 and the processed image signal DAT are transmitted to the data driver 500. Export to

The gate control signal (CONT1) includes at least one clock signal and the like to control the output of the scan start instruction to start the scanning of the gate-on voltage (V _on) signal (STV) and the gate-on voltage (V _on).

The data control signal CONT2 is a horizontal synchronization start signal STH for transmitting data of one pixel row, a load signal LOAD for applying a corresponding data voltage to the data lines D ₁ -D _m , and a common voltage V _com. ), The inversion signal RVS, the data clock signal HCLK, and the like, which inverts the polarity of the data voltage (hereinafter, referred to as "polarity of the data voltage" by reducing the "polarity of the data voltage" with respect to the common voltage)).

The data driver 500 receives the image data DAT for one row of pixels according to the data control signal CONT2 from the signal controller 600, and displays each image among the gray voltages from the gray voltage generator 800. By selecting the gray scale voltage corresponding to the data DAT, the image data DAT is converted into the corresponding data voltage and then applied to the data lines D ₁ -D _m .

The gate driver 400 applies the gate-on voltage V _on to the gate lines G ₁ -G _n in response to the gate control signal CONT1 from the signal controller 600, thereby applying the gate lines G ₁ -G _n. ) Turns on the switching element Q connected thereto, so that the data voltage applied to the data lines D ₁ -D _m is applied to the corresponding pixel through the turned-on switching element Q.

After one horizontal period (or “1H”) (one period of the horizontal sync signal H _sync , the data enable signal DE, and the gate clock CPV), the data driver 500 and the gate driver 400 are next. The same operation is repeated for the pixels in the row. In this manner, the gate-on voltages V _{on are} sequentially applied to all the gate lines G ₁ -G _n during one frame to apply data voltages to all the pixels. At the end of one frame, the next frame starts and the state of the inversion signal RVS applied to the data driver 500 is controlled so that the polarity of the data voltage applied to each pixel is opposite to that of the previous frame ("frame inversion). "). In this case, the polarities of the data voltages flowing through one data line are changed according to the characteristics of the inversion signal RVS even in one frame (eg, inverted rows and inverted dots) or the polarities of the data voltages applied to one pixel row are also different from each other. (Eg: nirvana, point inversion).

Next, a data converter for a display device according to an exemplary embodiment of the present invention will be described in detail with reference to FIGS. 2 to 4.

2 is a schematic diagram illustrating a data conversion apparatus and a peripheral device according to an embodiment of the present invention, and FIG. 3 is a diagram illustrating a data format of general image data and a data format according to an embodiment of the present invention. 4 is an example of a circuit diagram of a data conversion device according to an embodiment of the present invention.

As shown in FIG. 2, the data conversion apparatus 900 according to an exemplary embodiment of the present invention is connected between an external graphic controller 100 and a display device 200, and has 24-bit data from the graphic controller 100. (DF1 [23: 0]) or data DF2 [23: 0] is received and converted into 30-bit image data RGB [29: 0] and transmitted to the display device 200. At this time, the image data RGB [29: 0] consists of 10-bit red data R [9: 0], green data G [9: 0], and blue data B [9: 0].

Next, a data format and a method of generating image data RGB [29: 0] using the same will be described with reference to FIG. 3.

3A illustrates a data format of general 8-bit image data RGB [23: 0]. The video data RGB [23: 0] consists of 8-bit video data R [7: 0], G [7: 0], and B [7: 0]. Image data R [7: 0] is assigned to bits b23-b16, image data G [7: 0] is assigned to bits b15-b8, and image data B [7: 0]. ]) Is assigned to bits b7-b0.

FIG. 3B shows the data format (hereinafter, referred to as "format 1") of the data DF1 [23: 0].

The format selection data S1 assigned to the most significant bit b23 of the data DF1 [23: 0] is one of the format 1 and the data format of the data DF2 [23: 0] (hereinafter referred to as "format 2"). According to which format the output image data RGB [29: 0] is to be generated.

10-bit image data D [9: 0] is allocated to bits b19-b10 of the data DF1 [23: 0], and 10-bit image data C [9: 0 is assigned to bits b9-b0. ]) Is assigned.

The red, green and blue selection data SR, SG and SB allocated to bits b22, b21 and b20 of the data DF1 [23: 0] are respectively the red, green and blue data R [9: 0]. , G [9: 0], B [9: 0]) determines which data to select from among the image data C [9: 0] and the image data D [9: 0]. For example, if the values of bits b22, b21, and b20 are "101", the red and blue data R [9: 0] and B [9: 0] are selected as the image data C [9: 0]. , Green data G [9: 0] is selected as image data D [9: 0].

As described above, according to the data format 1, at least two of the red, green, and blue data R [9: 0], G [9: 0], and B [9: 0] are image data (RGB [ 29: 0]).

3 (c) shows data format 2. FIG.

The format selection data S1 allocated to the most significant bit b23 of the data DF2 [23: 0] is the same as that of format 1, and the 30-bit image data (RGB [29: 0] ]) Decide whether to create it or not.

10-bit image data C [9: 0] is allocated to bits b9-b0 of the data DF2 [23: 0], and is used as green data G [9: 0].

Bits b21-b16 and bits b15-b10 of the data DF2 [23: 0] respectively have 6 bits of blue crystal data F [5: 0] and red crystal data E [5: 0]. ) Is assigned. Blue data B [9: 0] is generated by adding blue crystal data F [5: 0] to image data C [9: 0], and red data R [9: 0] The red crystal data E [5: 0] is added to the data C [9: 0] to generate the data. The most significant bits b21 and b15 of the blue and red crystal data F [5: 0] and (E [5: 0]) may be used as sign bits, in which case the blue and red data B [ 9: 0], R [9: 0]) has a value of ± 31 difference from the green data (G [9: 0]) value.

Bit b22 of data DF2 [23: 0] is a reserved bit RB. The reserved bit RB may be used as a sign bit, in which case the blue and red data B [9: 0] and R [9: 0] have the same difference as the green data G [9: 0] value. Signed and having a value between ± 63.

As described above, according to the data format 2, the image data (RGB [29) in which the blue and red data B [9: 0] and R [9: 0] are within a predetermined range of the green data G [9: 0]. : 0]).

3D illustrates a bit structure of the image data RGB [29: 0] generated as described above. Bits b29-b20 of the image data RGB [29: 0] are red data R [9: 0], and bits b19-b10 are green data G [9: 0]. Blue data B [9: 0] is allocated to (b9-b0).

FIG. 4 is a block diagram of a data conversion apparatus 900 according to an embodiment of the present invention, which converts data DF1 [23: 0] and DF2 [23: 0] into image data RGB [29: 0]. It demonstrates in detail for reference.

As shown in FIG. 4, the data conversion apparatus 900 according to an embodiment of the present invention transmits data for each bit b23-b0 of the data DF1 [23: 0] and DF2 [23: 0]. A processing block connected to the bus (hereinafter assigned the same sign as the data bits) and including a processing block BL1 including a multiplexer MX1-MX3, and adders AD1 and AD2. (BL2) and multiplexer (MX4).

Each multiplexer MX1-MX3 includes a select terminal, two 10-bit input bus terminals and a 10-bit output bus terminal.

Each multiplexer MX1-MX3 has two input bus terminals connected to a data bus b19-b10 and a data bus b9-b0, respectively, so that the image data D [9: 0] and the image data C [ 9: 0]).

The multiplexer MX1 has a selection terminal connected to the data bus b22 to receive red selection data SR, and according to the red selection data SR, the image data D [9: 0] and the image data ( Either C [9: 0]) is sent to the output bus terminal as red data R1 [9: 0].

The multiplexer MX2 is connected to the data bus b21 to receive the green selection data SG. The multiplexer MX2 receives the image data D [9: 0] and the image data according to the green selection data SG. Either C [9: 0]) is sent to the output bus terminal as green data (G1 [9: 0]).

The multiplexer MX3 is connected to the data bus b20 to receive the blue selection data SB, and the image data D [9: 0] and the image data according to the blue selection data SB. One of (C [9: 0]) is sent to the output bus terminal as blue data (B1 [9: 0]).

In this way, the processing block BL1 stores the data DF1 [23: 0] input by the data format 1 in red, green, and blue data R1 [9: 0], G1 [9: 0], and B1 [9: 0]) is converted into video data RGB1 [29: 0] and exported.

Each adder AD1, AD2 includes a 10 bit input bus terminal, a 6 bit input bus terminal and a 10 bit output bus terminal.

The adder AD1 has a 10-bit input bus terminal and a 6-bit input bus terminal connected to the data bus b9-b0 and the data bus b15-b10, respectively, so that the image data C [9: 0] and the red crystal data are added. (E [5: 0]) is applied and the data obtained by adding the image data (C [9: 0]) and the red crystal data (E [5: 0]) is output as red data (R2 [9: 0]). Export to bus terminal.

The adder AD2 has a 10-bit input bus terminal and a 6-bit input bus terminal connected to the data bus b9-b0 and the data bus b21-b16, respectively, so that the image data C [9: 0] and the blue crystal data are added. (F [5: 0]) is applied, and the data obtained by adding the image data C [9: 0] and the blue crystal data F [5: 0] are output as blue data B2 [9: 0]. Export to bus terminal.

On the other hand, the processing block BL2 sends the image data C [9: 0] to the output bus where the data bus b9-b0 extends as green data G2 [9: 0].

In this way, the processing block BL2 stores the data DF2 [23: 0] input by the data format 2 in red, green and blue data R2 [9: 0], G2 [9: 0], and B2 [9: 0]) to convert the image data (RGB2 [29: 0]).

The multiplexer MX4 includes a select terminal, two 30 bit input bus terminals and a 30 bit output bus terminal.

In the multiplexer MX4, two input bus terminals are connected to the processing block BL1 and the processing block BL2, respectively, to respectively output the image data RGB1 [29: 0] and the image data RGB2 [29: 0]. In addition, the selection terminal is connected to the data bus b23 to receive the type selection data S1. The multiplexer MX4 selects one of the image data RGB1 [29: 0] and the image data RGB2 [29: 0] as the image data RGB [29: 0] according to the format selection data S1. Export to output bus terminal.

In the present embodiment, data corresponding to red, green, and blue of the data DF1 [23: 0], DF2 [23: 0] and the image data RGB [29: 0] may be interchanged in each color unit. . In addition, the three primary colors constituting the image data are not limited to red (R), green (G), and blue (B), and may be magenta, cyan, yellow, or the like.

As described above, according to the exemplary embodiment of the present invention, the 10-bit image data can be generated by modifying the format of the 8-bit image data. Accordingly, the color characteristics of the 10-bit display apparatus can be evaluated using the 8-bit image signal source. .

Although the preferred embodiments of the present invention have been described in detail above, the scope of the present invention is not limited thereto, and various modifications and improvements of those skilled in the art using the basic concepts of the present invention defined in the following claims are also provided. It belongs to the scope of rights.

Claims (9)

An input unit configured to receive input data including first and second image data and first to third selection data from the outside; A first multiplexer for selecting any one of the first and second image data and outputting the first color data according to the first selection data; A second multiplexer for selecting any one of the first and second image data and outputting the second color data according to the second selection data; A third multiplexer which selects one of the first and second image data according to the third selection data and outputs it as third color data; and An output unit configured to export output image data including the first to third color data Data conversion device for a display device comprising a. In claim 1, And the first and second image data are 10 bits. In claim 2, And the first to third color data are data representing one of three primary colors. An input unit for receiving input data including input image data and first and second additional data from an external device, A first adder which adds the first additional data to the input image data and sends it out as first color data; A second adder which adds the second additional data to the input image data and exports it as second color data; and An output unit configured to export third color data composed of the input image data and output image data composed of the first and second color data Data conversion device for a display device comprising a. In claim 4, The input image data is 10 bits, and the first and second additional data are 6 bits. In claim 5, And the first to third color data are data representing one of three primary colors. First input data including first and second image data and first to fourth selection data from outside, or a second input including the first image data, first and second additional data, and the fourth selection data. An input that receives data, A first multiplexer for selecting any one of the first and second image data and outputting the first color data according to the first selection data; A second multiplexer for selecting any one of the first and second image data and outputting the second color data according to the second selection data; A third multiplexer for selecting one of the first and second image data and outputting the third color data according to the third selection data; A first output unit configured to export first output image data including the first to third color data; A first adder for adding the first additional data to the first image data and outputting the fourth color data; A second adder which adds the second additional data to the first image data and exports it as fifth color data; A second output unit configured to export sixth color data consisting of the first image data and second output image data consisting of the fourth and fifth color data; and A fourth multiplexer for exporting any one of the first and second output image data according to the fourth selection data Data conversion device for a display device comprising a. In claim 7, And the first and second image data are 10 bits, and the first and second additional data are 6 bits. In claim 8, And the first to sixth color data are data representing one of three primary colors.

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