KR200335209Y1 - Apparatus to convert RGB data for computer display to RGB signal for picture monitors or LCDs - Google Patents

Abstract

The present invention relates to an apparatus for converting a signal in order to display the progressive scan image signal on the interlaced image display device. Conventionally, in order to convert a sequential digital video signal such as a computer or a portable terminal into an interlaced scan method, a digital sequential scan video signal is synthesized analog to a North American television signal standard (NTSC) or a European television signal standard (PAL). And it has been used again as a method of demodulating the analog signal of red (R), blue (B), green (G) and applying it to the interlaced display, but the modulation and demodulation process of NTSC / PAL signal is added. As necessary, the implementation is complicated, there is a problem in the implementation of the product, such as power consumption, miniaturization of the terminal. In addition, in the case of a portable terminal, since the display size is small, there is a problem in that both horizontal (910 lines in the case of NTSC) and vertical (525 lines in the case of NTSC) scan lines of the NTSC or PAL method cannot be accommodated. In order to solve this problem, in order to solve this problem, the order of applying a signal to each R, G, and B dot (DOT) of the display is divided into an odd field and an even field, and is applied differently. Even in a small portable terminal having a sequence of video signal characteristics by setting R, G, B signal application order differently, it has the same image quality as NTSC / PAL method and the process of modulating and demodulating signals like NTSC through separate digital signal processing R and G signals were created and applied to the display by a simple digital / analog conversion process, thereby enabling a high resolution image display having twice the resolution without deterioration of image quality. Using the present invention has the advantage that a sequential image such as a computer can be displayed in a high resolution without deterioration of image quality on the interlaced-type television monitor or image LCD.

Description

Apparatus to convert RGB data for computer display to RGB signal for picture monitors or LCDs}

The present invention relates to a device for converting an image for displaying a progressive scan video signal on an interlaced video display device. A conventional computer monitor or a mobile phone LCD display displays an image by a progressive scan method. Images are displayed by interlaced scanning. In order to display a progressive video signal on an interlaced display, the video signal must be converted to interlaced scanning. In addition, a small LCD for a standard video display such as in a viewfinder or a portable terminal of a camcorder has a pixel arrangement having a delta shape, the aspect ratio of the screen is 4: 3, and the number of pixels in the horizontal direction is equal to the number of pixels in the vertical direction. On the other hand, high resolution graphics and characters for computers, mobile phones, and PDAs are manufactured based on LCDs with square pixels, which are displayed on the LCD for image display. Is not possible and the aspect ratio of the image is different, there is a problem that is displayed wide in the horizontal direction. To this end, sequential digital video signals are synthesized into analog signals according to the North American Television Signal Standard (NTSC) or European Television Signal Standard (PAL), and then red (R), blue (B), green (G) analog It has been used as a method of demodulating the signal into three components and applying it to an interlaced display. However, as an additional modulation and demodulation process of NTSC / PAL signal is required, the implementation is complicated and power consumption increases, making it difficult to apply to a mobile terminal. There is this. In particular, in the case of a portable terminal, the display has a small size and cannot accommodate both horizontal (910 lines in the case of NTSC) and vertical (525 lines in the case of NTSC) scan lines of NTSC or PAL.

In the present invention, in order to solve the above problems, in order to convert a sequential video signal into an interlaced signal, the digital video data for sequential scanning is stored in a memory, and the odd field and the even field are changed to match the interlaced video. After reading them separately, convert them to analog at the final stage and provide them to the LCD, eliminating the modulation / demodulation process of color video signals as in conventional NTSC or PAL, and applying them to portable displays. The order of applying the signal to the (DOT) is divided into odd and even fields and applied differently, and the R, G, B signal application order of the horizontal line and the odd line of the horizontal signal is set differently in each field. Solves the problem that the image is stretched in the horizontal direction by doubling the resolution, and the resolution in the vertical direction is odd. Without the segment so as to scan the same line were to receive a signal standard of NTSC / PAL system.

1 is a block diagram of a conventional device

(A) Digital image data output unit: A block that outputs R, G, B image data, clock, and synchronization signal from a computer or processor.

(B) Analog video converter: A block for converting digital video data R, G, and B into analog and outputting the analog video.

(C) NTSC / PAL video signal synthesizing unit: A block that creates NTSC or PAL standard color video signals by using analog R, G, B signals and sync signals made in (B). A block that outputs a composite video signal (CVS: Composite Video and Sync).

(D) NTSC / PAL video signal demodulator: A block that demodulates a sync signal and R, G, B signals from a composite video signal and outputs it as an analog signal.

(E) LCD driver: A block that converts signals into inverted and non-inverted signals to drive the LCD.

(F) Image synchronizing signal generator: A block for generating a subcarrier signal and a synchronizing signal required to make an NTSC or PAL signal.

-R, G, B: digital R, G, B data

-AR1, AG1, AB1: Analog R, G, B signals are digital signals converted to analog simply.

-CVS: Composite video signal, NTSC / PAL standard signal.

-AR2, AG2, AB2: Analog video signal of NTSC or PAL standard.

-Sync 1: This is a sync signal used for computer monitors, which consists of horizontal sync and vertical sync.

-Sync 2: NTSC / PAL standard sync signal, consisting of horizontal sync and vertical sync.

-Sync 3: Sync signal separated from composite video signal, consisting of horizontal sync and vertical sync.

-Clock 1: Write clock of digital R, G, B.

-Clock 2: This is a multiplication clock of the color signal component of NTSC / PAL standard.

Clock 3: Clock required to apply a signal to a dot on the LCD.

2 is a block diagram of the subject innovation

(A) Digital image data output unit: A block that outputs R, G, B image data, clock, and synchronization signal from a computer or processor.

(B) Memory unit: A block for storing digital image data R, G, and B in memory according to clock 1.

(C) Field / line switch: Switching block that changes the output order of R2, G2, B2 data inputted by making field and line signals using the clock and synchronization signals provided in (B).

(D) Digital / analog converter: A block that converts digital R, G, B data to analog.

(E) LCD driver: A block that converts signals into inverted and non-inverted signals to drive the LCD.

(F) System clock and synchronization signal generator: A block for synthesizing the clocks required for the horizontal and vertical synchronization signals and the memory part output and analog conversion of data using the synchronization 1 signal.

-R1, G1, B1, R2, G2, B2: Digital R, G, B data

-R3, G3, B3: Digital R, G, B data output in different order according to odd and even fields on the screen, odd and even lines on the horizontal line

-AR, AG, AB: Analog R, G, B signals.

-Sync 1: This is a sync signal used for computer monitors, which consists of horizontal sync and vertical sync.

-Synchronization 2: Synchronization signal provided from the memory unit to the LCD driver at the same timing. It consists of horizontal and vertical synchronization.

-Clock 1: Write clock of digital R, G, B.

-Clock 2: This is a system clock that is designed for LCD dots to read data from the memory and provide it to the LCD driver.

3 is a timing diagram of the present invention

Sync H: Horizontal Sync Signal

Clock 2: Clock 2, which is the system clock in FIG.

Odd lines: The odd lines of the horizontal signal

-Even line: Even line of the horizontal signal

R3, G3, B3: R, G, B signals of the (C) field / line switch output of FIG.

<Explanation of abbreviation>

-Sequential Scanning Image: Image used to display horizontal lines sequentially from the top

LCD (liquid crystal display): An electronic device that changes and transmits various electrical information generated by various devices into visual information by using a change in transmittance of a liquid crystal according to an applied voltage.

-Interlaced scan image: This image is used to scan horizontal lines alternately from the top. It is divided into even and odd fields.

-NTSC: North American color television signal specification

-PAL: European color television signal standard

The present invention provides a digital image data output unit for outputting image R, G, and B data, a memory unit for storing image data, a field / line switch unit for outputting the output order of stored data according to fields and lines, and a synchronization signal. System clock and synchronization signal generator to make synchronization and system clock necessary for LCD operation, and converts the output R, G, B data into analog signal which is LCD driving signal. The LCD is composed of a digital / analog converter and a liquid crystal display (LCD) driver. The pixel arrangement of the LCD for image is different from that of a general computer or PDA. In the scanning method, computers and PDAs are sequentially scanned, but images are interlaced in LCDs. That is, the same image is divided into an even field and a horse field to scan the same image up and down twice. In the present invention, the image data having twice the resolution is divided into two fields by half-sampling in the horizontal direction, and the images are displayed by displaying each field by changing the R, G, B image application order on the LCD. The horizontal resolution of is doubled. In order to enable the distinction of the vertical lines by two frames, as shown in FIG. 3, the odd horizontal lines are applied to the LCD in the R, G, and B order after the horizontal synchronization signal, and the even lines are B Apply in the order of, R, G. In the case of the even field, the odd-numbered line after the horizontal synchronization signal is applied as B, R, and G, and the even-numbered line is applied in the order of R, G, and B as opposed to the odd field. The image displayed on the LCD of the vertical line displayed in this way is displayed on the left side of the line in the odd field in the odd field, and the dot formed in the odd field on the right side of the even field is spaced one dot apart. Is displayed. The human eye can see both lines of the field, and as a result can achieve twice the resolution. The operation of the present invention will be described with reference to Figs.

In the digital image data output section of Fig. 2, one image is written to the memory section R, G, and B, which are digital image data, at intervals of 1/30 seconds. This is a computer display image created based on the standard. (F) The system clock and synchronization generator generates a vertical synchronization signal, a horizontal synchronization signal, and a clock to send R, G, and B signals to the LCD by using the synchronization 1 signal and the self oscillation clock of (A). A) memory section and (c) field / line switch section. (C) In field / line switch, (B) read data of memory part using vertical sync, horizontal sync and clock, count vertical sync signal, and divide even number into even field and odd number into odd field. Use as a signal to control. Similarly, horizontal sync also counts from the start of vertical sync to produce odd and even lines. As shown in (a) of Figure 3, in the odd field, the horizontal sync signal is started in the odd horizontal line and then the signals are applied to the LCD in the order of R, G, and B. In the even horizontal line, the horizontal sync signal is started. The output is applied to LCD in the following B, R, G order. 3 (b) In the even field, data is output to be applied to the LCD in the order of B, R, G in the odd horizontal line and R, G, B in the even horizontal line, as opposed to in the odd field. D) Provided to digital / analog converter. The digital / analog converter converts the received digital data R3, G3, and B3 into analog. At this time, the converted clock uses clock 2 and generates the black level signals of the analog video signals AR, AG, and AB in horizontal and vertical synchronization. . The AR, AG, and AB signals are applied to the LCD driver of FIG. 2 together with the clock 2 to be displayed on the LCD. In this way, an interval of 1 dot is generated between the R, G, and B points in the current field and the B, R, and G points in the next field, thereby doubling the horizontal resolution. The reason for changing the R, G, and B order between adjacent lines is that the image monitor LCD has a delta dot arrangement. For the sake of understanding, the operation will be described as one embodiment. (B) Write the video data into the memory. (C) The field / line switch unit reads 320 * 240 images as odd-field and even-field 160 * 240 resolution images according to the signals of the system clock and synchronization signal generator and outputs them according to the control signals. Here, the two 160 * 240 images are 1 / 2-sampled images of the 320 * 240 image written in the memory unit in the horizontal direction. Therefore, (C) The image output from the field / line switch part is output half the sampled image in the horizontal direction according to the odd and even field, and the R, G, B signal arrangement of the line according to the number of fields and lines The output is arranged differently. The reason for not making 1/2 sample in the vertical direction is that the horizontal aspect ratio of the pixel used for the image display coincides with the horizontal aspect ratio of the original image when the horizontal image is 1/2 sampled. (C) The signal output from the field / line switch unit is converted to analog from the digital / analog converter and (e) applied to the image LCD through the LCD driver to display the necessary image.

According to the present invention, by using the present invention, it is possible to express sequential scanning images such as a computer in high quality without deterioration of image quality on a device of interlaced scanning type such as a conventional TV or LCD for image, and digital signal processing By using it is easy to implement and low cost effect. In addition, it is possible to display the image to have a double resolution on the image monitor LCD used in the portable terminal.

Claims (1)

R, G, B dots are arranged in sequence to form one odd horizontal line, and B, R, G dots are arranged in sequence below the odd horizontal line to form one even horizontal line. An apparatus for converting a computer monitor image into an image monitor type image by repeating vertically forming the two horizontal lines so that dots form a delta structure. Digital image data output unit for outputting digital image data of each R, G, B dot A memory unit for storing the digital image data output from the digital image data output unit A system clock and synchronization signal generator for generating and outputting a clock for transmitting a vertical synchronization signal, a horizontal synchronization signal, and a respective R, G, B digital image data signal to the LCD. The digital image data stored in the memory unit is read and divided into a first field and a second field by using the vertical synchronizing signal, a horizontal synchronizing signal, and a clock output from the system clock and synchronizing signal generator, and the horizontal synchronizing signal is read. To generate an odd-numbered horizontal line signal and an even-numbered horizontal line signal, and to count the vertical synchronization signal, an odd-numbered digital image data of the first field in each of the horizontal lines. Is a field / line switching unit for switching to output digital image data of a second field in each horizontal line A digital-analog converter for converting digital image data switched and output by the field / line switching unit into analog image data; And an LCD driver for driving an LCD to display the converted analog image data on the liquid crystal display (LCD).