TW594656B - High-resolution-quality liquid crystal display device and driving method thereof - Google Patents

Abstract

A design of liquid crystal display device is disclosed. The quality of output image is enhanced through the design of improved driving way for the use of TV, computer screen and PDA. The gray scale data signal modulator of traditional LCD is improved by adding a preamble signal data processor, so as to process the noise in the inputted gray scale data signal, or to detect the characteristics of the input signal. After the processing of the gray scale data signal, the best adjusted gray scale data signal can be obtained, thereby the LCD can output the best image quality.

Description

594656, Amendment ‘

V. Description of the invention (1) 1. The technical field to which the invention belongs The present invention relates to the design of a liquid crystal display, especially a design through an improved driving method, using a front-end signal processor to suppress noise of the input image, and / Or detect different frame rates to solve the problem of over-compensation or under-compensation, and improve the quality of the round-robin image, which can be used for LCD monitors such as televisions, computer screens and pda. Second, the working principle of the prior art liquid crystai displayer (LCD) is to control the arrangement of liquid crystal molecules using voltage, and to use the interaction between polarized light and liquid crystal molecules to control light through each pixel (P 1 X e 1) The intensity 'can thus control the color and brightness of each pixel to form an image. However, due to the limitation of the characteristics of the liquid crystal molecules, the liquid crystal molecules turn to have a specific response time constant with the applied voltage. This response time is related to the nature of the liquid crystal molecules, such as the viscosity coefficient (, dielectric constant) and: ί 4. On the other hand, this response time is also related to the design of the liquid crystal panel, Good such as the thickness of filling the gap between the two poles of the liquid crystal, etc. With the general TN type, the rise response time is about 208, and the fall response time is 3 ° ^: However, the f-like response time is still better than- The length of the frame interval (, water, tool, tianerdao, ib.67ins) is the length of time, which will lead to a miaodan when the moving day and time are displayed. The phenomenon of blurred motion, or the after image phenomenon of the mouth, due to; a… image quality. U can not get a good amount of shadows against this residual image phenomenon, in addition to looking for the burden «知 鬲 LCD Molecular turning speed

仏 · y.-5th, 5th, 5th, the invention said: extra-legal can also use the image grayscale signal _ Lang, gray signal $ The residual image caused by = can be structured diagram J and _ section grayscale two, Synchronization and display of dog-level signal data transfer, ----- η η gate driver = display panel i 4, knowing the trace signal; multiple A16 'for transmitting the shadow gate line 15 and these pictures It is not difficult to find that the role of the gray-scale signal regulator in the gray-scale road is to decode the data until the liquid crystal display pressure is on each brightness of the liquid crystal panel. Modified MJL · After inputting through proper drive settings, it can be modified via modulator). For example, its main data sequence; once replaced by pair 1 3, use it to include insulated image signal data line signal tone. The first picture of the original afterimage should include a gray-sequential data driver to supply the data to continuously supply a plurality of gates across and across, and a node device surrounded by 16 like 10 in the liquid image. The problem of the gray scale, the driver circuit of the re-display device, one pixel, to reach the display meter to solve the problem by a good factor fluid for the first-order signal controller 12, use pressure, and scan the signal line 15, the edge gate element matrix area The crystal display signal will be adjusted to provide the display image. — The gray scale crystal-like liquid crystal regulator 1 is used to transmit this and output $ Tiger for the transmission of line 15 and its structure. Device and its material are properly ashed properly

Art 7Tl-73X ΤΤΠ = 遽 Adjusted and responded to the display 10, used to control the adjusted image signal and a liquid transmission. The data lines are driven by the first drive through the grayscale signal data, electrical color or as shown in the second picture. Shown is the principle of a traditional gray-scale signal. It mainly contains the grayscale signal of an image ^ ^ input = this application is used to receive the grayscale signal of the input image; a frame memory ^ input 20, ory) 21 is used to remember the grayscale signal data of the previous frame meffl ~ (controller) 22, used to control the frame memory ^ and two

594656 02U Rod χ Year Month Day β 丨 --------——_ i. V. Description of the Invention (3) ~ i Memory read and write operations; a signal converter (signal conver ter) 23 For adjusting and inputting the grayscale signal; and a signal output terminal 2 4 for outputting the adjusted grayscale signal data to the data driver 1 2. The main function of the signal converter 23 is to compare the input current frame data with the previous frame data in the frame memory 21, and adjust the voltage signal data of the image appropriately through the appropriate compensation voltage (c 〇mpensation voltage) correction ', and then output the compensated voltage signal. Figures 3a and 3B are schematic diagrams of using the compensation voltage to correct the image signal data to improve the afterimage phenomenon. It can be seen from the third A graph that because the response time is too slow, the output immunity cannot reach a predetermined brightness within a frame time interval. However, from Figure 3B, it can be found that through proper compensation voltage correction, the output image brightness can be increased to a level consistent with the input image data within a frame time, thus effectively improving the effect of liquid crystal molecules turning. Afterimages caused by slow time response. In general, in order to improve the efficiency of the Nanning signal converter in processing image data to calculate the compensation voltage, a pre-set comparison table (100 k — uptab 1 e) is usually used, and a look-up table method is used to increase the processing speed. . Although the technology described above can effectively improve the image afterimage problem caused by the time response of liquid crystal molecules; however, the design of general grayscale signal regulators does not consider the problem of image noise. From the third A and three B diagrams, it can be found that the main function of the compensation voltage is to amplify the signal voltage to an appropriate level. However, this voltage amplification process will also amplify the noise of the input signal at the same time, which will often cause the image noise ratio. (S / N rat i 〇) lowered, thereby reducing the quality of the output image. On the other hand, current drivers

594656 V. Description of the invention (4) The design does not take into account that the frame rate is different, so it will also be a sufficient phenomenon. There are some amendments to be made and some appropriate ones to be born. Third, send the text through changing the gray scale number of the signal tone so that the noise of this book on the one hand, the phenomenon can be tested through the test liquid in view of the good content of the invention to drive the invention of the invention, the data signal processing LCD display The inventor has solved the problem, and the previous solution causes the signal crystal of the invention to display different frame rates from · 9 · Travel.I ::; month I, and I. However, the degree of response of the liquid crystal molecules in the picture frame time is different. Over compensation or compensation is not in view of this. For the driving mode of the liquid crystal display, it is necessary, especially the design of the gray-scale signal regulator. , Should be improved to achieve the best image quality. In order to improve the above-mentioned shortcomings, the present invention adopts the transmission mode or the response mode according to the main mode, and the indicator adopts the response depending on the different lifting characteristics. The purpose is to provide a design method to add a method to detect the most available output. The front voltage regulator also has a frame-speed output image at a special signal speed, and boosting the output is an improvement of the traditional front signal to measure the input signal to the adjusted good image. The signal caused by the day quality signal processor can be designed. Used to rate the resulting image quality. Under the change of liquid crystal display, it provides a liquid crystal display device that can also obtain the liquid crystal display image at the same time. The characteristic of the signal is the best gray level. It can reduce the noise reduction ratio and detect the new signal of different over-compensated indicator structures. Good device design and quality. The gray level in the device is used to process the input, and through the data signal, the phenomenon of the input image is produced. On the premise of another frame rate or insufficient compensation, the driving method uses image quality.

Page 9 594656 I V. Description of the invention (5)

The description of the technology of the present invention enables a deeper understanding. The following will explain the contents, features, and functions with a more detailed description by way of examples and drawings. Fourth, the embodiment is shown in the fourth figure, that is, The present invention is a functional schematic diagram of the improved setting of the gray-scale signal regulator 40. This gray-scale signal adjuster 40 is similar to the gray-white signal of the prior art. It also has an image gray-scale signal input, 41 frame § frame memory 42, a frame memory. Controller 43, a signal converter (signal c〇nverter)

44, a comparison table (10ok-up table) 45 is used to provide fast signal conversion and a signal output terminal 46. . The invention is characterized in that a signal preprocessor 47 is added between the image input terminal 41 and the signal converter 44. After the current frame data ρη is input from the input terminal, it can be corrected to Fn by the signal pre-processor 47 first. The correction of this part can be compared with the previous frame data in the frame memory 42 by [] 'to obtain the corrected Fn. Next, Fn and F η-1 in the memory frame 4 2 of the frame a are input to the converter 4 4. Through the signal converter 4 4 and the comparison table 4 5 ', the adjusted image frame can be quickly converted and output. Information MFn. The adjusted image frame data MFn can provide correct compensation voltage to avoid unnecessary over-compensation and make the LCD display output correct color shirt and brightness. In some cases, the signal pre-processor 4 7 can be designed to measure the characteristics of the input signal, so it does not need to be compared with the previous frame data Fn-1, and only through appropriate detection or calculation, Turn the flag representing this characteristic to the signal converter. By receiving

594656 92 · 9, ~ 5 Biography, ψ year and month ο _ 5. Description of the invention (6) The flag of this characteristic, the signal converter 4 4 can provide the compensation voltage in an appropriate way, so the correct adjustment image frame is output. Data MF η. The gray-scale signal conditioner 40 described above, and the signal pre-processor 47 thereof, can be designed to suppress the noise of the input image, which is also the first specific embodiment of the present invention. The functional diagram shown in the fifth figure is the first specific implementation of designing the signal pre-processor as a processor with noise suppression function 51 and improving the transition compensation phenomenon that the signal converter may cause. example. The method of suppressing noise can be explained by the schematic diagrams of six A and six B. As shown in Fig. 6A, first, the previous frame data F η-1 and the current frame data F η are input to a subtractor 6 1, and then the obtained F η -F η-1 is input to a comparator 6 2 'Compared with a preset threshold value N th. Then, according to the comparison result, different correction parameters a (where flfSl) 63 are selected; the selection method is as follows: a = 1, if \ F nF nj I > N th ^ a < ly if \ F ^ FnA \ < Nth . Where a satisfies the selected correction parameter a, the modified frame data Fn 'can be obtained using the following relationship: difa = l,

Fn ~ Fn- \ + < Fn ~ Fn-\\ where a < 1. In other words, when 丨 · ^ — A-ι l >

594656 month

Ty t lr -ν 'V. Description of the invention (7)

^ fnTTtJ's F η ′ does not need to be modified; however, if the signal is modified, the modified F η ′ can be used to overcome the noise suppression effect of the described noise suppression processing method. According to the figure (f 1 u c t u a t i ο η), the miscellaneous aspect can be passed through because the signal does not pass through. The gray level signal device as described above can also be designed to have the function of detecting the input and not intended. That is, this method can detect the rate of the transient compensation phenomenon caused by the device that can detect the frame rate of the input signal. The input terminal of the eight-signal synchronization signal 80 ', a timer 82, and an image synchronization signal representing a specific picture input' and a device to find out the frame of the input signal quickly. Using this flag, it is possible to modify the overshoot caused by different frame rates. According to the expected purpose disclosed above, it provides a high method that can be used by the industry to convert to the above-mentioned southern quality. The LCD displays \ Nth, Fn is judged to be noisy, and the value of a lower than 1 reduces the noise. As mentioned above, it can be further illustrated with Figure 6B. It is found that the function of signal fluctuation suppression caused by noise is effectively reduced, and another correction is made to retain the original signal. The function invention of the signal characteristics of the signal will be The signal front-end circuit 71 is used to modify another specific embodiment diagram for further explanation. Counter (counter) frame rate flag output itself refers to the timer rate, and represents the speed to select the appropriate contrast compensation phenomenon will be able to show the content, this creative quality LCD monitor and method proposed invention patent demonstrator And its driving method number pre-processing. For example, the seventh imager is designed for good signal conversion. The detection frame has a shadow 81 and a reference terminal 8 3. Through, use the flag of the counting rate to enter the table, and therefore improve. It is indeed possible to reach its driver. Of an embodiment,

Page 12 594656 1 e ;, — d repair "v .. year and month 0 0 夂 ': ^ 福 幻 _ V. Description of the invention (8Γ» > ^ It is only an illustrative description. Where the present invention is applied for a patent scope device Those who drive the method should be regarded as inconsistent with this creation.

Page 13 594656

Simple illustration of the diagram ------------- V. Simple illustration of the diagram The first diagram is a functional diagram of a liquid crystal display. The second diagram is a functional schematic diagram of a gray-scale signal conditioner used by a conventional LCD to improve output response. The third and third pictures are the traditional gray-scale signal conditioners, which use the appropriate compensation voltage to output the output voltage to drive the display to the correct color or brightness within a frame time interval.

The fourth figure is a schematic view of adding a front-end signal processor to the gray-scale signal conditioner of the present invention to process or detect the characteristics of the input signal. The fifth figure is a schematic diagram of the present invention that the front signal processor is designed to suppress the input signal noise. The sixth diagram A is a schematic diagram of the working principle of a signal processor before suppressing signal noise according to the present invention. FIG. 6B is a schematic diagram of the effect of the signal processor before suppressing signal noise according to the present invention. The seventh figure is a schematic diagram of the present invention that the front signal processor is designed to detect the characteristics of the input signal (take the frame rate as an example).

The eighth diagram is a schematic diagram of the working principle of the present invention for detecting different frame rates. [Illustration of Symbols] 1 0: Gray-scale signal regulator 1 1 ·· Sequence controller

Page 594 656

I yz y. -5 \ year. / 1 ： i Schematic description 1 2 Data driver 1 3 Gate driver 1 4 LCD panel 1 5 Gate line 1 6 Data line 2 0 Grayscale signal data input terminal 2 1 Frame memory 2 2 Controller 2 3 Signal converter 2 4 Signal m Out 4 0 Grayscale signal tone / r / c ie 4 1 Grayscale signal input 4 2 Frame memory 4 3 Frame memory Controller 4 4 signal converter 4 5 pair of clock 4 6 signal m output 4 7 signal pre-processor 5 1 processor for noise suppression function 6 1 subtractor 6 2: comparator 6 3 correction parameter selection 7 1 Frame rate circuit for detecting input signal 8 0 Input terminal for image synchronization signal 8 1 Counter 8 2: Reference timer 8 3 Flag output terminal for specific frame rate

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Claims (1)

594656 92 · 9.-5 years J: n i :: i VI. Patent application scope L _----------------- '' 1. A high quality LCD , Including: a grayscale signal conditioner for receiving grayscale signal data, and outputting adjusted by considering the grayscale signal data of the current frame and the previous frame, and by considering the characteristics of the grayscale signal data The gray-scale signal is lean, and a data driver is used to convert the adjusted gray-scale signal data into the corresponding data voltage and output the image signal; A gate driver for continuously supplying scanning signals; and a liquid crystal display panel including: a plurality of gate lines for transmitting the scanning signals; a plurality of data which is insulated from and crosses the gate lines Line for transmitting the image signals and a pixel matrix, which is composed of an area surrounded by the gate lines and the data lines. 2. The high-definition liquid crystal display as described in item 1 of the scope of patent application, wherein the signal pre-processor of the gray-scale signal adjuster performs noise suppression (η 〇isereducti ο η) on the input gray-scale signal data. deal with. 3. The high-definition liquid crystal display as described in item 1 of the scope of patent application, wherein the gray-scale signal regulator includes: a gray-scale signal data input terminal; A frame memory for storing the grayscale signal data of the previous frame; a controller for controlling the frame memory and the frame memory reading and writing operations; a signal pre-processing For pre-processing or detection from gray levels Page 16 594656 VI. Characteristics of gray-scale signal data at the signal input end of the patent application range; A gray-scale data signal converter is used to consider the gray-scale signal data processed or detected by the preprocessor and from the figure The frame memory receives the grayscale signal data of the previous frame and outputs the adjusted grayscale signal data; and a grayscale signal data output terminal for outputting the adjusted grayscale signal data to the data driver. 4. The high daytime liquid crystal display as described in item 3 of the scope of patent application, The signal pre-processor of the gray-scale signal conditioner performs signal characteristic detection on the input gray-scale signal data to provide a signal converter to select an appropriate conversion method. 5. The high-day quality liquid crystal display as described in item 4 of the scope of patent application, wherein the detection of grayscale signal characteristics includes detecting different image systems (NTS C, PAL or HDT), or different frame rates , Or video content with different signal-to-voice ratio characteristics (TV gam e or movie) or different interfaces (AV or DVI), or different signal characteristics due to user preferences. 6. A method for driving a high-definition liquid crystal display, including the following steps: The grayscale signal data of the input image is first passed through a grayscale signal conditioner; the grayscale signal conditioner is used to appropriately adjust the input grayscale signal data; the adjusted grayscale signal data is output to a data driver; The data driver converts the adjusted grayscale signal data into pairs Page 17 594656 92U Correction of the shadow of the image of the application, patent application No. 3 -----------image data voltage; and drive each pixel in the LCD with the image data voltage To achieve the color and brightness that the image is intended for. 7 8 The driving method of the high-definition liquid crystal display according to item 6 of the scope of patent application, wherein the step of adjusting the input image signal data by using a grayscale signal adjuster is to consider the grayscale of the current frame and the previous frame The signal data and the adjusted gray-scale data signal are output by considering the characteristics of the gray-scale signal data. The driving method for a high-day-quality liquid crystal display as described in item 7 of the scope of patent application, wherein the step of adjusting the input image signal data by using a gray-scale signal regulator includes: using a signal pre-processor to perform noise suppression in advance deal with. 9. The driving method of the high-definition liquid crystal display as described in item 8 of the scope of patent application, wherein the noise suppression processing step is to consider the difference between the current frame grayscale data signal and the previous frame grayscale data signal. A set noise boundary is directly outputted as a signal, if it is smaller than the set noise boundary, it is regarded as noise, and it must be suppressed and corrected before being output. 1 0. The driving method for a high-definition liquid crystal display as described in item 9 of the scope of the patent application, wherein the suppression correction method of the noise suppression processing step is full. When | foot— | < 乂, then + a {Fn-FnA) Page 18 of January 594656 I --------- 4¾ Η U j ------------ Fan s where A is the current frame information and β-1 is the previous image Frame data j is the current frame data after correction, which is a preset noise and noise boundary, and a may be a preset constant that satisfies a-f, Fn'Fn-\ 'N, or a may Change according to the size of the noise, yes. 1 1. The method for driving a high-definition liquid crystal display according to item 7 of the scope of patent application, wherein the step of using a gray-scale signal adjuster to adjust input image signal data further comprises: using a signal pre-processor to detect in advance The characteristics of the input gray-scale signal data are measured, and a flag representing the characteristic is generated by the signal pre-processor, and the flag is transmitted to the signal converter to provide different signal conversion methods. 12. The method for driving a high-day-quality liquid crystal display as described in item 11 of the scope of patent application, wherein the input gray-scale signal characteristics detected by the signal pre-processor include: different image systems (NTSC, PAL or HDT ), Different frame rates, video content (TV game or movie) with different signal-to-noise ratio characteristics, different interfaces (AV or DVI), or different signal characteristics due to user preferences. 13. The driving method for a high-day-quality liquid crystal display as described in item 11 of the scope of patent application, wherein different signal conversion methods can use a signal converter to correct or select different comparison tables. Page 19