TW427093B - Display device for automatically adjusting the horizontal width of image screen - Google Patents

Abstract

The present invention provides a display device and method for automatically adjusting the horizontal width of an image screen. The display device is used to display the screen picture signal from a computer. The screen picture signal comprises a plurality of vertical synchronous signals, a plurality of horizontal synchronous signals and a plurality of video signals. The image screen shown on the display device is composed of a plurality of video signals. The display device comprises a display screen for displaying the image screen; a display circuit for processing the screen picture signal from the computer and displaying on the display screen; a first timer circuit for calculating the time interval between two horizontal synchronous signals; a second timer circuit for calculating the time interval for the image portions of the synchronously received video signals between the two horizontal synchronous signals; and a control circuit for calculating and adjusting the horizontal width of the image screen shown on the display according to the outputted time interval from the first and the second timer circuits so as to match the horizontal width of the image screen with the horizontal width of the display screen.

Description

V. Description of the Invention (1) The present invention provides a display device and method, and more particularly, a display device and method capable of automatically adjusting the horizontal width of the daylight surface of an image.

The display device is a commonly used device, which can be used to convert the screen signal from the computer to the image day and time, so the user can read and use the information in the computer. With the advancement of science and technology, the display screen of the display device has gradually progressed from the previous cathode image tube to a liquid crystal display panel (1 i q u i d crystal display panel) and a projection display screen. No matter what kind of display screen, the display device must be able to provide various horizontal widths to meet the different needs of users. The presentation of different horizontal widths depends on how the display device processes the screen-day signal from the electro-brain. If the processing method is not perfect, users often have to manually adjust the display device by visual inspection, which is very troublesome in operation. Therefore, how to properly process the signal transmitted from the computer to automatically adjust the horizontal width has become an important issue in the research and development of display devices today. See Figure 1. FIG. 1 is a schematic diagram of a conventional display device 12 receiving a screen image signal. The conventional display device 12 receives a screen daytime signal from a computer 10 through a cable composed of several signal lines, and the screen image signal includes a horizontal synchronization signal, a vertical synchronization signal, and an image. signal. These signals are transmitted by different signal lines respectively, showing that 'devices 12 will display images after receiving and processing these signals]

Page 5 4.270 9 3 V. Description of the invention (2) Please refer to FIG. 2 ′ FIG. 2 is a schematic diagram of image segmentation of the conventional image frame 21. Taking the resolution of 80 0x600 as an example, the display device 12 divides the image frame 21 into a total of 600 horizontal scanning lines in a vertical direction, and each horizontal scanning line has 800 small squares. The display device 12 will send pixels in order to display a daytime image according to these small squares. First, the first horizontal scanning line 20 is from the first grid to the 800th grid, and then the second horizontal scanning is performed. Sight line 2 2 from the 1st to 800th grid, send out pixels one by one, until the 6th horizontal scan line 2 4th from the 8th grid 'and then recycle from the first Line 1 of the horizontal concealment line starts sending out pixels to display the next display day. See Figure III. Figure 3 shows the timing of the screen picture signal shown in Figure 1, and the sequence of VS, HS and Videos in the figure represents the vertical synchronization signal, horizontal synchronization signal, and video signal on the time T axis. Each time the display is set to 12, a vertical synchronization signal 3 is received, which means a new image is started. 2 1 'Therefore, after the time t 0 when a vertical synchronization signal is started, the image signal will be changed by the image day The first line of 21 starts to be displayed in sequence: a horizontal synchronization signal 3 2 indicates the start of a new horizontal scanning line, and then a horizontal synchronization signal 32 2 is received after time t1. , From the first row of the image day 1 to the first row of the first display to the last = last frame; and after the horizontal synchronization signal 3 3 time 12 received 2 '4 image 4 is the image day The first line of the second line of the face 2 1 is displayed sequentially: to the last line of the second line, and so on. If the resolution is 800 × 600, as shown in VS and HS of Figure 2, after the vertical synchronization signal 30, the image plane 21 will start with the horizontal synchronization signal 32, and will be sent from the first line in order.

4270 9 3 V. Description of the invention (3) — 60 horizontal scanning lines until the next vertical synchronization signal 34 is cycled. θ The display devices that are used to automatically adjust the horizontal width of the image frame, especially the display devices of cathode f-tubes (CRT), liquid crystal monitors (LCD Monitors) or projection type projectors (projectors), are established as A comparison table of group horizontal synchronization signal frequency, vertical synchronization signal frequency, and horizontal width of the daytime image. When the display device 12 receives the screen daytime signal, the computer i 〇 sends the horizontal synchronization signal and the vertical synchronization signal to the display device 12, and then the display device 12 uses the frequency of the horizontal synchronization signal and the vertical synchronization signal. The way of looking up the table is to find the horizontal width corresponding to the frequency of this group, and then automatically adjust the horizontal width of the image frame. Please refer to Figure 4 "Figure 4" is the time sequence of the screen daylight signal and sampling clock 40 shown in Figure 1. The pixel clock indicates that the sampling clock 4β is at a predetermined horizontal width. It shows that the phase-locked loop in the device will automatically generate a sampling clock 40 of a certain frequency, which is used for each image signal and level. The synchronization signal performs a sampling operation. The control circuit of the display device will calculate according to the sampling result and temporarily store the processed horizontal width data into a daytime buffer in the display device. Then the display device of the LCD monitor or projection projector will display the digitized result in the daytime buffer on the display screen. However, 'due to the horizontal synchronization signal and vertical signal output from the graphics card in the computer 4270 9 3 '; 5. Description of the invention (4) The frequency of the direct synchronization signal may not be the same as the frequency data pre-stored in the display device 12, so the display device 12 may not be able to know the correct horizontal width according to the comparison table. At this time, it is necessary to rely on artificial setting adjustments, which will increase the annoyance. Therefore, the main object of the present invention is to provide a display device capable of automatically adjusting the horizontal width of the daylight plane of the image, which can automatically adjust the horizontal width of the daytime plane of the image by calculating the time ratio between an image signal and a horizontal synchronization signal. , So that the display device can be applied to a variety of different display cards. Brief description of the diagrams Figure 1 is a schematic diagram of a conventional display device receiving a screen image signal. Fig. 2 is a schematic diagram of conventional image scanning and displaying day-time image segmentation. Figure 3 is a timing diagram of the daytime signal of the screen shown in Figure 1. Figure 4 is the timing diagram of the daytime signal and sampling clock of the screen shown in Figure 1. FIG. 5 is a schematic diagram of a display device receiving a screen image signal according to the present invention. FIG. 6 is a functional block diagram of the display device shown in FIG. 5. FIG. 7 is a timing diagram of the screen daytime signal shown in FIG. 5. Figure 8 is a timing diagram of the horizontal synchronization signal, video signal and sampling clock shown in Figure 7. FIG. 9 is a circuit diagram of the first timing circuit shown in FIG. 6. FIG. 10 is a schematic circuit diagram of the second timing circuit shown in FIG. 6. Explanation of symbols in the diagram 4270 9 3 V. Description of the invention ¢ 5) 50 Display device 52 Display screen 54 Display circuit 56 First timing circuit 5 8 Second timing circuit 60 Control circuit Please refer to Figure 5. FIG. 5 is a schematic diagram of signals received by the display device 50 of the present invention. The display device 50 of the present invention is electrically connected to each other through a cable 10 and the brain 10 for displaying the screen number transmitted from the computer 10, and the cable includes a plurality of signal lines. The signal on the screen of the computer 10 includes a plurality of vertical synchronization signals, a plurality of step signals, and a plurality of image signals, and the vertical synchronization signal step signals and image-signals are transmitted from different signal lines to the display 50. A daylight image displayed on the display device 50 is composed of the plural numbers. Among the screen daytime signals transmitted from the computer 10, a plurality of horizontal synchronization signals are included between the direct synchronization signals, and the image signals are transmitted to 50 ° in synchronization with the corresponding horizontal synchronization signals. See FIG. 6. FIG. 6 is a block diagram of the display device 50 shown in FIG. 5. The display device 50 includes a display screen 52 for displaying a surface, and a phase locked loop (Phase Locked Loop (3PLL) 61). A sampling time display circuit 54 capable of counting the first timing circuit and the second timing circuit for processing the computer. The screen daytime message from 10 is displayed on the display screen 52. A first timing circuit 56 is used to level the time between the synchronization signals; a second timing circuit 5 8 the screen daytime L and an electric day The video from the face-to-face video is horizontally and horizontally display device. Two video signals are vertical, and the function of each video display device is used to generate pulses. One display number and count it as two waters. meter

427093 V. Description of the invention (6) The length of time with the image portion of the image signal which is synchronously transmitted by the computer 10 between the two horizontal synchronization signals; and a control circuit 6 0 ′ according to the first timing circuit 5 6 and the second timing circuit 5 8 calculate the length of time of the image signal i received between the two horizontal synchronization signals, which has the longest time length of the image signal, and adjust the display screen 5 accordingly. 2 The horizontal width of the day surface of the displayed image, so that the horizontal width of the image frame matches the horizontal width of the display screen 52. The display circuit 54 includes a daytime buffer 62 for temporarily storing the image signal transmitted from the control circuit 60. When the display device 50 is a projection-type projector, the display circuit 54 is a projection-type display circuit, which is used to convert the screen daytime signal from the computer 10 into an optical image daytime surface and project it to the display screen. 52, and the display 52 is a projection projector screen. When the display device 50 is a liquid crystal display, the display screen 52 is a liquid crystal display panel. Please refer to Figure 7 and Figure 8. Figure 7 is a timing diagram of the screen's daytime signal shown in Figure 5, and VS, HS, and Video sequentially represent the vertical synchronization signal, horizontal synchronization signal, and video signal. Figure 8 is a timing diagram of the horizontal synchronization signal, sampling clock, and video signal shown in Figure 7, and Pixel Clock indicates the sampling clock. In the starting screen signal transmitted from the computer 10, every two vertical synchronization signals 7 2 and 7 8 contain a plurality of horizontal synchronization signals 6 0 0 between time points t 0 and t η, and each image The signal is transmitted to the display device 50 in synchronization with the corresponding horizontal synchronization signal.

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427093 V. Description of the invention (7) Please refer to Figure 8 and Figure 9. FIG. 9 is a circuit diagram of the first timing circuit 56 shown in FIG. 6. The first timing circuit 56 includes a D flip-flop 70 for providing a time point 12 of the negative edge of the horizontal synchronization signal 84: a first counter 74 for calculating the horizontal synchronization signal 8 4 from The number of sampling clocks from the time point 12 to the time point t 5 before the arrival of the next horizontal synchronization signal 86; and a first register 80 for storing the sampling time calculated by the first counter 74 Pulse number.

When the horizontal synchronization signal goes from low to high (at time point 11), the output of the D flip-flop 70 is low and the first counter 74 is reset to zero. When the level is equal to the step signal from high potential to low potential (at time point 12), the output of the D flip-flop 70 is locked to a high potential, so the first counter 74 starts counting the number of sampling clocks. When the horizontal synchronization signal reaches the high level again (at time point t 5), the number of sampling clocks calculated by the first counter 74 is output to the first register 80, and the first counter 74 is reset to zero again. . Please refer to FIG. 8 and FIG. 10. FIG. 10 is a circuit diagram of the second timing circuit 58 shown in FIG. Taking the resolution of 8 0 X 6 0 0 as an example, each image day surface 21 is composed of 600 horizontal scanning lines 20, and each horizontal scanning line 20 is composed of two horizontal synchronization signals. It consists of a plurality of image signals transmitted from time to time. The purpose of the second timing circuit 58 is to find the time length of the horizontal scanning line 20 with the longest horizontal width among the 600 horizontal scanning lines 20 of an image frame 21. To find the longest horizontal scan line 2 0

Page 11 427093 V. Description of the invention (8) The interval length is to find the longest time length of the image signal among all the horizontal synchronization signals. In order to achieve the above purpose, the second timing circuit 58 can be divided into two parts: The first part calculates the longest end time tav of the video signal between all the horizontal sync signals between the two vertical sync signals. This first part of the circuit includes a D flip-flop 76, which is used to provide a time point t 2 at which the negative edge of the horizontal synchronization signal starts; a second counter 7 5 is used to calculate the horizontal synchronization signal from Time point ΐ 2. The number of sampling clocks between time point t 5 before the next horizontal synchronization signal arrives; a second register 8 1 and a third register 8 2 are used to store a second counter 7 5 The number of sampling clocks calculated, in which the initial setting value of the third register 82 is the minimum. When the horizontal synchronization signal is switched to a high potential (at time 11), since there is no image signal, the output of the D flip-flop 76 is low, and the second counter 75 is reset to zero. When the negative edge of the horizontal synchronization signal starts to be input (at time point 12), the output of the D flip-flop 76 is locked to a high potential, so the second counter 75 will start counting the number of sampling clocks 59. When the input of the image signal with the negative edge portion of the image is ended, the number of sampling clocks 59 calculated by the second counter 75 is input to the second register 81. When the horizontal synchronization signal reaches the high potential again (at time point t 5) and the value stored in the second register 81 is greater than the value stored in the third register 82, the sample stored in the second register 81 The number of clocks is input to the third register 82, and the second counter 75 is reset to zero. Since there are multiple horizontal synchronization signals in the two vertical synchronization signals, the above steps are repeated until the next vertical synchronization signal reaches

^ 1270 9 3 V. Description of Invention (9). The purpose of the first part of the circuit is to use the third register 82 to know the image display position of the rightmost end of the display screen in the same frame. The second part of the circuit is to calculate the shortest time tba between all the horizontal synchronization signals between the two vertical synchronization signals, when the image signal starts to appear (also called the "back porch" part). This section contains two D flip-flops 84, 85, which are used to provide a point in time t 3 at which the video signal starts;-a fourth register 8 6 and a fifth register 8 7 'Used to store the number of sampling clocks calculated by the second counter 75, wherein the initial setting value of the fifth register 87 is the maximum. When the horizontal synchronization signal is switched to a high potential (at time 11), since there is no image signal, the outputs of the D flip-flops 84 and 85 are low, and the second counter 75 is reset to zero. When the image signal with the image begins to be input (at time point 13), the output of the D flip-flop 85 is locked to a high potential, and the number of sampling clocks calculated by the second counter 75 will be input to the fourth temporary存 器 86。 86. When the horizontal synchronization signal reaches the high potential again (at time point 15) and the value stored in the fourth register 86 is smaller than the original value stored in the fifth register 87, the fourth register 86 stores The number of sampling clocks is input to the fifth register 87, and the second counter 75 is reset to zero. Since there are a plurality of horizontal synchronization signals between the two vertical synchronization signals, the above steps are repeated until the next vertical synchronization signal arrives. The purpose of the second part of the circuit is to use the fifth register 87 to know the image display position of the leftmost end of the display screen in the same day.

-427093 V. Description of the Invention (ίο) Therefore, the control circuit 60 can apply the sampling clock experienced between the second horizontal synchronization signal after two vertical periods (that is, an entire image day surface 2 1). Take the example as an example, to be more precise, the control circuit 60 reads the low potential time elapsed between the step signals); reads from the third register 82 in the two vertically synchronized horizontal video signals, the video The number of sampling clocks at the end of the longest signal; and the shortest time tba of the image (postcap) from all the horizontal synchronization signals between the fifth register 87 read step signals is obtained here You can-determine the time elapsed during the display of the water signal in the day. The time tvide. = tav-tba. The ratio of this th is linear to the horizontal width of the daytime image. The formula for horizontal width can be simulated as follows:

H = A * tvideo / th + B where tvide. Is the amount between time point t3 and time point t4, t h is the horizontal width of the daytime plane of the image sampled between time point t 2 and time point t 5, and A and B are constants. Therefore, as long as the constant A of each display device is known, it can be inputted according to the first 56 and the second timing circuit 58 and tvide. To automatically adjust the degree of image displayed on the display 5 2. The constants A and B are calculated as follows: The quantity read by the time synchronization register 80 of the direct synchronization signal (in reality, it is all the time between the two sampling clock quantity signals with the same level 1: av) The number of good clocks begins to appear on two vertical same signals. For example, the film with the widest flat width assumes tvide (5 / relationship, so the number of clocks of the sampling clock is calculated. Η is _ Β. Duration th Horizontal width of the day surface 4270 9 3 V. Description of the invention (11) 1. Make the computer output the first set of vertical synchronization signal, horizontal synchronization signal, and image signal, and manually adjust the level of the day surface of the image displayed on the display screen 52 Width H]. Record tvideQl, thI, horizontal width Η, 〇2. Make the computer output the same vertical sync signal and horizontal sync signal as the first group, but change the length of the video signal, manually adjust the display screen 5 2 The horizontal width H2 of the daytime surface of the displayed image. Record the tvideo2 't h2 and the horizontal width H2 at this time. 3. Tvideol, thl, I; v L deo2 ^ ΐ h2, H2 into the formula H > A * tvide. / th + B, the values of A and B can be calculated. 4. Since this formula is only an expression for estimating the horizontal and horizontal width, the values of A and B are more representative You can repeat the procedure of step 2. Calculate the values of several groups A and B according to the horizontal width 1 ^ 3 ..., thn, and horizontal width Ηη ', and then calculate the average value. In another embodiment, consider that The horizontal synchronization signals of different frequencies may also affect the horizontal width 昼 of the daytime plane of the image, so the formula for simulating the horizontal width can be modified to H = A * tvide. / Th + Β + C (f) where C (f) Constants that should be used for different horizontal sync pulse frequencies.

The calculation method of the constants A and B is the same as that of the first embodiment described above. The calculation method of C (f j) is I 1. The number of horizontal synchronization signals that the display device wants to support depends on its frequency.

427093 V. The description of the invention (12) is divided into a plurality of frequency sections Π, f 2, f 3 ... 2. Ask the computer to output the first group of vertical synchronization signals' horizontal synchronization signal and image signal in the first frequency section, and manually adjust the horizontal width of the day and day of the image displayed on the display screen 52. Record the tvideQl and thl at this time brought into the formula H = A * tvide (3 / th + B horizontal width, and the difference from the aforementioned horizontal width H1 is the value of C (Π). 3. Repeat step 2 for Calculate the corresponding C (f 2), C (f 3) _ · .. in the frequency bands f 2, f 3., etc. of other horizontal synchronization signals. In this way, the complete constants A and B can be obtained , C (f). The above two embodiments are applicable to the factory in mass production. When the factory is in mass production, as long as A, B (or A, B, C (f)) is calculated in advance, It can be stored in the memory of each display device. In this way, each display device can cooperate with the A and B constants (or A and B) stored in advance according to the received tvUec) 3 and th3. , C (f) constant) and corresponding formulas, the correct horizontal width Η of the image frame can be automatically calculated, and the user no longer needs to worry about manual adjustment. In another embodiment, during the mass production in the factory, various characteristics of different display devices will be slightly different, and these differences may also affect the horizontal width of the daytime image of the image, so we can formulate Then adjust it to: H; A * tvideo / th + B + C (f) + D (Mon it or), where D (Monitor) represents the normal

4270 9 3 V. Description of the invention U3). This constant is determined by the factory in the actual production operation after the value of the AC (f) constant is determined, and then a little is done for each display device so that each display device can have the most appropriate horizontal width display. Knowing the display device 12, the display device 50 of the present invention is based on the time length th & tvide output from the second timing circuit 58. Here: The horizontal width of the daytime image of the image displayed on the display screen 5 2 can be displayed on the display card with various horizontal synchronization signals, so that the display can be installed in various display cards produced by different manufacturers. The above description is only a preferred embodiment of the present invention. Any equivalent changes and modifications made in accordance with the scope of the patent issued by the present invention shall fall within the scope of the present invention. B. Adjustment and performance. The first 56 I tune is applicable

Claims (1)

， It is the road where the water level and the surface of the water level are in the display. The use of water should be done by letter;,, like the road show, the road show, the screen and the electricity are shown. Electricity meter is used to count all the time; count the recovery, show that the first one is connected, and the scene is displayed on the first: long step to draw a picture by showing one by one: The envelope display of the letter. The display of the daytime display screen shows the installation of the display. ·, The harvested surface is connected to the structure of the daylight house, the image of the number is between the shadow and the shadow; The same level of flat water. The two shadows and two pieces of the time display with the calculator to calculate the number of the time display, the day can be displayed on the second screen and the display shows the time and the display The width of the screen is flat and the first display of the water should be based on the whole day. Come to use the shadow. When the road is long, it will be controlled by phase when it is powered. The output is wide and the output is flat. 4270 9 3 6. Patent application scope 1. A display device used to display a screen picture signal, the screen picture The signal includes a plurality of vertical synchronization signals and a plurality of horizontal synchronization signals. 2. The display device as described in the item 1 of the scope of patent application, wherein in the i: screen signal from the computer, every two vertical signals The synchronization signals include a plurality of horizontal synchronization signals, and each of the image signals is transmitted to the display device in synchronization with the corresponding horizontal synchronization signal. 3 · The display device as described in item 2 of the scope of patent application, wherein the strategy is two.. When the circuit includes a comparison circuit, it is used to find the interval between two vertical synchronization signals. The first and the second line of Fan Lili Electric are exclusively requested by Shen Jingru. 4. Install the display display as described in the installation of the display ^ ° ^ Road heading monthly electricity number is included with the cable included ψα / 1 image and asterisk. The letter setting step is the same as that shown in the plain display. The step number of the transmission line is the same as the number of the straight line of the letter. The line number is divided into the line number r 4270 9 3 Γ 6. The scope of patent application I Among all the horizontal synchronization signals, among the video signals, the longest time length has the video part, and the control circuit is based on the second timing circuit. The longest time length of the circuit output is Ϊ of the first timing circuit output. The length of time to adjust the horizontal width of the image frame displayed on the display screen. 5. The display device described in item 1 of the patent application, wherein the display screen is a liquid crystal display panel ° 6. The display device described in item 1 of the scope of patent application, The display circuit is a projection type display circuit, which is used to convert the screen picture 1 signal from the computer into an optical image and project it onto the display screen. 7. The display device according to item 1 of the scope of patent application, wherein the display circuit includes a daytime buffer for temporarily storing the shadow signal transmitted by the display circuit. ^ 8. — A method for processing the day and time signal of the screen. The screen signal includes a plurality of vertical synchronization signals, a plurality of horizontal synchronization signals, and a plurality of image signals. The method includes: Page 19 '4270 9 3 VI. Scope of patent application Calculate the length of time between the two horizontal synchronization signals in the above-mentioned plurality of horizontal synchronization signals as the first time length calculated from the synchronization received in the horizontal synchronization signal. The time length of the image signal with the image part is the second time length and the horizontal visibility of the displayed daytime plane is adjusted according to the first time length and the second time length. Page 20