TW559767B - Automatic Gamma correction system and method of display to adjust the reference voltage of data driver - Google Patents

Abstract

The present invention relates to an automatic Gamma correction system and method of display to adjust the reference voltage of data driver, which is mainly to establish a new adjusting and correcting method for the external reference voltage of data driver. It has an automatic Gamma correction system and a data driver connected to a group, wherein the automatic Gamma correction system is for outputting plural adjustable Gamma voltage. The adjusted Gamma voltage is connected to the data driver, so as to drive the display to operate, and thereby to prevent the gray scale loss and reduce the cost effectively.

Description

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Drawing number 89127Qnft V. Description of the invention (1) (1) Technical field of the invention: ^ The present invention relates to a kind of tuning. Automatic gamma (G a m m) correction system Color block gray scale adjustment method to change (2) Technical background of the invention: 1. In recent years, due to the development of photoelectric technology, the development of technology has changed rapidly. However, the quality of the image tube TV or the current thin ° Gamma parameter has a great impact. Therefore, during the development of the gamma display electronic system, the characteristics of each display will be caused by the process stability. . At this time, if the user wants to obtain the current photoelectric characteristics of the display, if there is no automatic correction system, there is a display of the reference voltage of the incomplete data driver, and the method, by a newly designed reference voltage of the data driver. With the continuous advancement of technology and components, as far as the display is concerned, no matter whether it is the correction of the traditional film liquid crystal display (TFT-LCD), the correction of the gamma parameters of various displays has always been one of the important considerations. However, the relationship between display temperature and panel temperature changes will vary depending on the use time to produce a better image effect. It is necessary to adjust the gamma parameter curve for each but it is time-consuming and cannot effectively reduce the cost. Related driving technologies In order to achieve the purpose of automatic gamma parameter correction, the correction technology of the feedback system with a detector installed in the display is proposed. Please refer to Figure 1 for this conventional technology. Figure 1 is a US patent Rows of digital / analog converters with switched capacitors No. 6, 0 4 6, 7 1 9

Driver g (Column Driver With Switched-Capacitor D / A

Converter), its application date is July 7, 1997. As shown in Figure 1, a temperature detector (TEMP) (1014) is installed inside the display (101 2), and the Gamma parameter is calculated with reference to the lifetime (AGE) of the display.

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89127QnR V. Description of the invention (2) n. (〇 1 〇) and further input to the display driver (C ο 1 u m η

Di ^ v = r) (1018) (that is, the data driver ρΗνπ). Therefore, the voltage signal of the shell driver is fixed. The disadvantages of the conventional technical architecture shown in Figure 1 are as follows: (1) Gas requires a built-in temperature sensor to operate. (2) For the digital system's gamma parameter correction system, the correspondence of changing the gray scale value of the image is adopted. In this way, the gray scale number of the image will be lost. (3) The effect of the user's changing the monitor settings on the gamma correction cannot be taken into account. Another: A conventional Gamffla parameter correction circuit framework has been proposed to improve the brightness or color uniformity of the same display, as shown in Figure 2. The figure 2 shows the color and brightness control system of liquid crystal projection display of liquid crystal projection display (U.S. Patent No. 6,04,37,97). , Its application date is u 5th, 996. As shown in Figure 2, the display is divided into nine areas (1 2 A to 1 2 N), and the gamma control is performed by the corresponding control unit. The circuit implementation example of this conventional technology is shown in Figure 3, A, B, and C, which are analog or digital RGB signal inputs, respectively, and are further matched with a look-up table or a gamma parameter correction liquid crystal display drive control method. The disadvantages of the conventional techniques in Figures 2 and 3 are: (1) For each display, all possible gamma parameter correction curves must be calculated first and stored in a look-up table (100k-up table) (100 )in.

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(2) The gamma parameter correction of 1 digital system uses the correspondence of the variable image grayscale value. In this way, the grayscale number of the image will be lost. Namely, two: On the one hand, the disadvantages of the conventional technology shown in Figures-and Figure 2 are that the user must have a precise light pick-up to operate. However, the normal-scale messenger, such as the LCD monitor display (such as liquid crystal display 1 rate (μ) curve or voltage-reflectance- (= ma) parameter correction can not produce a good image quality f. Is into It is inconvenient to use and needs to be improved. (3) Brief description of the invention: This Maoming provides an automatic gamma parameter correction system for the display to adjust the reference voltage of the data driver, mainly to propose a new way to set the display Reference voltage of data driver (Data Dr 1 ver) (such as liquid crystal display LCD). The main purpose of the present invention is to provide general users with the ability to perform Gamma without using a detector. The calibration work provides a system and method that are more suitable for general display users to adjust the image quality, so that the application of the present invention has great development potential. Another object of the present invention is to change the external gamma required by the data driver ( Gamma) reference voltage to achieve the purpose of gamma correction, so as not to lose the gray scale. Another object of the present invention is to use a low Scanner use of 'effective to provide a display of the manufacturer to reduce production costs in the manufacturing process, in order to enhance the competitiveness of products.

Page 6 559767 V. Description of the Invention-U Solar Device Reference Voltage For the purpose of the description, the adjustment data drive provided by the present invention includes an automatic Gamma correction system of an automatic display unit, which is included. Among them, the self-calibration system and the data driver voltage connected to a group. The monthly recognition of the σ horse fork positive system is used to output a plurality of adjustable gamma devices. It is included in the "automatic gamma fork positive system". There is a central processing value, and a new gamma reference voltage correction target is calculated during the process. An image generator is connected to the central processing unit to generate at least two color patches (Gray Patches). In the central office description system, there is a memory for storing the voltage value calculated by the CPU and the preset value of the pre-stored voltage ΠΪΓί for connecting to the display. And there is a group of programmable gamma processors. Two: ί Loss: central processing 11, according to the central T # result, a plurality of gamma voltages are generated after conversion. In addition, the input terminal of the data driver of the: = group is individually connected to the programmable gamma voltage generating circuit of the group to drive the display. In the above, the CPU is based on the voltage grayscale conversion characteristics and comparison results required by the data drivers of the group, and determines a new gamma reference voltage after calculation to avoid the grayscale loss of the display. For the automatic gamma correction method for a display device that adjusts the reference voltage of a data driver according to the present invention, the main steps include: (a) generating two gray-scale color blocks, which are even #day prime color blocks, and the other is (B) The user adjusts the grayscale value of the continuous daytime plain color block beyond a certain observation distance until the colorblock and the colorblock generated by the grayscale expansion technology. When the brightness of the light is visually equal, record the grayscale value d 1; (c) Generate two grayscale brightnesses different from the grayscale generated previously.

Page 7 559767 __Case No. 89127906__Year Month and Day_ Five. Description of the invention (5) Color patches, one is a continuous daytime plain color patch, and the other is a color patch produced by grayscale extension and expansion technology; (d ) The user adjusts the grayscale value of the continuous daytime plain color block in step (c) outside a certain observation distance until the brightness of the color block is equal to the visual perception of the color block generated by the grayscale extension technology. 3, record this gray level value d2 '(e) Calculate the corresponding voltage values of the two gray levels d 1 and d 2 using a table lookup and internal difference; (f) According to the two gray levels d 1 and d 2, and cooperate with the pre-built voltage grayscale conversion function to obtain two external gamma (Gamma) reference voltage correction target values; (g) repeat steps (c) to (f) to find the gamma of other grayscales Horse (Ga Banda) reference voltage correction target value; (h) After obtaining all ^ Horse II, after the voltage target is positive, adjust the input voltage of the data driver of the display to the target voltage value to complete the automatic gamma Horse (Ga_) correction. (IV) Brief description of the drawings: Patent No. 6, 046, 7 1 9 Figure 1 is the circuit diagram of the first U.S. patent for conventional technology. Figure 2 is a circuit diagram of one of U.S. Patent No. 6,043,797 for conventional technology. 〃 Figure 3 is the implementation of different circuits for different technologies shown in Figure M. Figure 4. External gamma reference of the data driver in the embodiment. Figure 5 is a schematic illustration of the digital code corresponding to the t series. Circuit block connection diagram of the first embodiment. i // i Λ In the embodiment, an example comparison table of Gamma corresponding digits '' ',', and the target value of the shell-to-shell degree.

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__Case No. 89〗 27flf) fi V. Description of the invention (6) Figure 6B is the first of the present invention. In the embodiment, the gamma obtained according to the comparison table of Figure 6 is a graph of reference voltage and relative brightness. . Fig. 7 is an example of an image diagram illustrating a user's action of performing gamma correction in the first / embodiment of the present invention. FIG. 8 is a schematic diagram of the implementation of the corresponding grayscale color block by using the grayscale extension technology in the / Kth embodiment of the present invention. Fig. 9 is a schematic diagram of determining the reference voltages V2 and V7 by using three consecutive gray levels in the / kth embodiment of the present invention. FIG. 10 is a circuit block connection diagram of the second embodiment of the present invention. Explanation of drawing numbers: 2 0, 2 2 automatic gamma correction system 4 0 image generator 6 0 programmable gamma voltage generating circuit 1 0 data driver 30 central processing unit 5 0 memory 70 detector A, B gray scale Color block T Continuous daytime gray scale color block S Gray scale color block SD 1 generated by gray scale expansion technology —Dimensional gray scale expansion technology SD1 'One-dimensional vertical gray scale expansion technology SD2 Two-dimensional gray Tier expansion technology (5) Detailed description of the invention: The present invention provides a system and method for adjusting the display driver's Gamma correction voltage for adjusting the reference voltage of the data driver. It is mainly intended to provide general users without using a detector. , You can do Gamma

559767 Case number 89127906

V. Description of the invention (7) It is more suitable for the general display system 'making the brightness curve of the present invention from the outside' the middle reference. Therefore, the 10 lines required to correct the bit code are provided by the display, and the voltage Invention is to adjust the Gamma & way. Method, and the gamma correction work, without losing the gray scale, is a system and method that provides users with the ability to adjust the image quality. It has great potential for development. Generally speaking, in order to establish a proper digital code, the data driver in the display (such as liquid crystal display) must be a serial reference voltage. Please refer to Figure 4 for the input data driver (Data Driver) 10 v v ^ 5. Represents the corresponding voltage value of different gray levels. In order to propose a new Gamma correction system and method, the reference voltage is used instead of changing the digital code of the input image. The present invention abandons the conventional technology to change the number of images and directly changes the data driver (Gamma) reference voltage value in the electronic circuit system. . First embodiment: No detector. Regarding the display of the reference voltage adjustment of the data driver according to the present invention, the circuit block connection of the Gamma calibration system is shown in Figure 5. These include an automatic gamma correction system 20, and the automatic gamma correction system 20 is a data driver 10 connected to a group. The automatic gamma correction system 20 is used to output a plurality of adjustable gamma voltages, which include: a central processing unit (CPU) 30, an image generator 40, and a memory. ) 50 and a group of Programmable Gamma voltage generating circuits 60. The connection relationship is the same as that of the central processing unit 30.

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The wheel power is connected to 559767 ^ =, which is connected to the image generator 40 and the programmable gamma = risen circuit 60 connected to the group, and the central processing unit 30 and the memory 50 are interconnected V ^ medium ' The output voltage of the programmable gamma voltage generating circuit 60 of the group is the data driver connected to the group. As shown in Figure 5, only two gamma reference voltages v are used as an example. The user can increase the number of reference voltages when i | The main functions of the components in the circuit block shown in Figure 5 are as follows: ^ The central processing of the Zhai 30 is based on the calculation of a new column of gamma during the gamma correction process. Reference voltage; if the image is generated | § 40, its input terminal is connected to the central processing unit 3 0, which mainly generates at least two color patches (Gray Patches). One of the color patches is produced by the Spatial Dithering of One or Two Dimensions, and the other color patch is generated by directly driving continuous pixels. Among them, the color blocks of the gray scale extension technology are used as reference color blocks, and the corresponding digital codes of the color blocks generated by continuous pixels can be adjusted by the user. The memory 50 is connected to the central processing unit 30 and stores the voltage value calculated by the central processing unit 30 and the preset value of the reference voltage of the pre-stored display. This includes the target value that stores the gamma voltage, and at least one set of target code (indicating grayscale) -luminance curve data. In addition, “Because the digital code (indicating gray scale) -voltage conversion function of data drivers produced by different manufacturers is very likely to be different, the gray-scale-voltage conversion function” must also be stored in the memory 50.

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89127〇nR V. Description of the invention (9) Revised ff surface 'Although the furnace built in the data driver of different manufacturers = ”, if the data driver is selected, the conversion function 2 will be used. The relevant information can be obtained through the data manual. (DataShe, J, and are stored in the memory 30. J Jin group: 可 Ke 式 gamma voltage * generating electricity ㉟ 60, its input terminal is connected to the middle and free of charge 3 0 'according to the central processor The calculation result of 30 is that a plurality of gamma voltages are generated after conversion, and the plurality of gamma voltages are connected to the lean driver 10 of the group. In this way, the gray scale-brightness objective production curve can be obtained To further drive the display.

The above describes the system connection method of the embodiment of the present invention. For each display, it has its own gamma correction preset value, and this preset gamma correction reference voltage is input to the data driver. in. In the embodiment of the present invention, it is mainly redefined according to the characteristics of the photoelectric conversion (Electric-Optical Transfer) in a display (such as a liquid crystal display).

The eight gamma reference voltages V wide V 8 are the ones indicated by the voltage signals input to the data driver | § 10 as shown in Figure 5. Furthermore, the grayscale values (ie, digital codes) corresponding to the eight reference voltages and the corresponding brightness are shown in the rows and columns of the comparison table in FIG. 6A. The values of V and V image are fixed after the contrast, brightness, and other color characteristics of the display are set. Therefore, it is only necessary to adjust and define six voltage values, such as the voltage VfV7, and the corresponding curve of the corresponding brightness target value. Please refer to FIG. 6B for cooperation. In order to facilitate the explanation of the operation principle of the present invention, it is assumed that the data drivers of the selected group must input eight sets of gamma reference voltages VWV8, and the corresponding grayscale values are shown in the comparison table of Fig. 6A.俟 Digital code (indicating gray scale) _Brightness

Page 12 559767 _Case No. 89127906__ Year Month Day Amendment _ V. Description of the Invention (10) After the target curve is determined, it is assumed that the corresponding target brightness value will be as shown in the third row of Figure 6A (the percentage value ). At this time, the gamma automatic correction system needs to determine the magnitude of the V wide V 8 voltage value, so that the voltage value converted by the data driver can make the digital code-brightness curve fit the target value. Since the contrast and brightness of the display have been set, the maximum and minimum voltages (V and V 8) have been determined, and the remaining six voltages V 2 to V 7 have yet to be determined. Method 2: Generate a gray scale with any gray level of brightness. Regarding the method of automatic gamma correction of the display according to the present invention, the reference voltage of the data driver is adjusted. First, two brightness levels are 0% and 100% grayscale values, to generate a color block of any grayscale value, the main steps are described with reference to Figure 6A, B: Step 1: Use the aforementioned image generator 4 0 to generate two Gray scale color blocks, one of which is a gray scale expansion technology (Spatial Dithering), with the use of 1: 1 all black and all white gray levels' to generate brightness 50% (see the figure The curve of 6B) 's gray scale' This color block is the one marked with the gray scale color block of the person as shown in Figure 7. The color block labeled A in Figure 7 can also be completed by using the frame rate control technology. On the other hand, for another color block (marked as B in Fig. 7), it is the color block B with a single gray level of continuous day prime. The gray level value of this color block can be adjusted according to the position of the scroll of the window. Followers adjust instantly. In addition, there is a way to generate the color block A by using the gray scale expansion technology, which will be described after the steps are described.

559767 Case No. 89127906 Amendment V. Description of the invention (11) Step 2: The user is located outside a certain observation distance, and adjusts the grayscale value of the digital code of the continuous color block B until the color block B and the grayscale extension technology The degree of partyness of the color block A is equal in visual perception. Write the gray level value (d 1) at this time into the software program or the memory 50. Step three: Repeat step one, that is, using the image generator 4 to generate two grayscale color blocks, one of which is to use the grayscale expansion technology to use the full black and full white 3: 1 to generate brightness 2 5 % Gray level (corresponding to the corresponding gray levels of V 4 and V 5 in the curve of B in Figure 6), this color block A can be completed with the technology of frame rate control (Frame Rate Control). The other color block B is also a single gray scale of continuous daylight. The gray scale value of this color block B is adjustable. Step 4: The user is located outside a certain observation distance, and adjusts the digital grayscale value of the continuous pixel color block B until the shells of the color block A of the color block 瞵 grayscale extension technology are equal in visual perception. Write the gray value (d2) at this time into the software program or memory. 5. According to the memory device 50, the built-in digital code (gray scale) of the data driver-the voltage transfer function (code_tc) _Vc) Hage Transfer Function), and the external step reference voltage of the data driver at this time The voltage value (v dl, V d2) of this gray level (dr d2) is obtained by looking up the table and adding the internal difference. · According to the target gray-level_brightness transfer function (Code-to—Luminance Transfer Functi〇n) recorded in the memory 50

P.14 i Find the grayscale values (D50% and D25%) corresponding to 50% (T1) and 25% (T2) transmittance. According to the built-in function of the data driver, Yuan Chu can make the gray level β ”correspond to the voltage ν 涣 ν㈣ external gamma 559767 _ cable No. 89127____ year-month Cr π:------------ five 2. Description of the invention (12) The reference voltage value of the horse is V /, V /, then the voltage value of V /, V 5 is determined. The related difference calculation formula is as follows: (Further explanation of the formula will be completed after the steps are completed. (Description) V 4+ c (di) x (V 4— v 5) Two V di = V 4 '+ c (D Τ1) χ (ν5'-ν4') (ι) V4 + c (d2) x (V4- V5) = V; + c (DT2) x (V5?-V;) (2) Step 7: Repeat steps 1 to 6 to find the value of other gamma reference voltages. To this step, V 2 to V 7 have been It is decided. And V〗 'and V 8' are decided by the user when setting the contrast, brightness and other parameters of the display. Therefore, the required values of V i ′ ~ v 8 in the data driver have been obtained. Step 8: After finding all the voltage target values, use the programmable gamma voltage generating circuit 60 to adjust the input voltage of the data driver 10 to the target value. In this way, the automatic gamma correction operation is completed. In addition, also can After each voltage is determined, the voltage is adjusted to the target value, which is the second method. The description of the gray-scale expansion technology (S pa ΐ ia 1 D ithering) described in step one of the first method is as follows: Level expansion technology is a common technology in a display, which is used to expand the number of gray levels in a display system. Please refer to Figure 8 to describe the display of two different gray scale color blocks with different area ratios. The gray scale extension technology can generate effective gray scale values in visual perception. The color block marked T is a predetermined continuous pixel gray scale color block, such as 50% brightness, and the color block marked S is It is a gray scale patch of 50% brightness generated by the gray scale extension technology. In terms of mathematical relationship, for the brightness (Transmission) or reflection (Reflection) Ti value, it is obtained by the gray scale extension technology. Produced effective

Page 15 559767 __ ^ Case No. 89127906 Month / Day Amendment _ V. Description of the invention (13) Gray scale color blocks can be expressed as follows: (3) Among them, T 1 and T 2 are used to generate effective gray scale values The brightness (or reflectance) of the two gray-scale color patches' and a: b represents the corresponding area ratio. For example, 100% and 0% can be used to generate 10% (1: 9 area ratio), 20% (1: 4 area ratio), 25% (1: 3), 75% (3: 1), 80 % (4: 1), 90% (9: 1 area ratio) gray scale. On the other hand, in order to reduce flicker, this color block can be completed with the frame rate control technology. For the gray scale extension technology, it can be done in one or two dimensions. Among them, if the display will suffer severe interference from wired or wireless electronic systems or display media, one-dimensional grayscale expansion technology should be used. In this case, the analog transmitter in the display card will extend horizontally, and alternately display the black and white lines, as shown in SD 8 in Figure 8. In addition, SD1 'is a gray scale in black and white in the vertical direction, and SD2 is a two-dimensional gray scale extension technology. On the other hand, the effect of the two formulas described in step 6 of method 1 above is mainly the numerical calculations to be completed in steps 1 to 6. Among them, V ^ v Jiang is the fourth and fifth reference voltages before the original calibration, and ^ 74 and v 5 'represent the required voltage values for obtaining a proper gamma correction curve. Formulas (1) and (2) side of the medium sign, the calculation formula, defines d and d jaundice, and then provides data to the central processor 30 according to v 4 and 5 at the time of the experiment, to further calculate V d and / The value of d. Step 6 is to execute the two formulas (丨) and (2) of the medium formula: “D 5G and D 25” when you use a specific data drive.

Page 16 »9767 month Amendment --- ^^ 89127906 V. Description of Invention (14)

The value of 5, and remembering the second f,: 3 ° can be calculated according to the formula V: and V terms are stored in memory 50. Step-by-step color generation The method of the present invention-I0 is adopted in each decision: the individual is larger ... It lies in the method 2 where the voltage reaches the target value. All cattle: adjust the input of the body driver: ί: force, and then perform other steps. The steps of the method of the present invention include: 4d is a step one of the first step ·· the aforementioned method is performed—Φ s _ service M t ^ Θ loyalty step one to step six, so as to define the voltage V / and vs, the target voltage value. Y step Use the programmable gamma 60 circuit of the group to adjust the two gamma reference voltages of V 4 and V 5 to the target value, and directly transmit this voltage to the data driver 10. Step 2: The gray scale value corresponding to the external reference voltage of the data driver 10 stored in the memory 50 is used to determine the gray scale value of the color block required for the next automatic gamma correction. In principle, the grayscale value that can be generated by using full black 'full white, or a set grayscale value (such as 50% brightness), and using an integer area ratio close to 1: 1 is prevailing. For example, 100% and 50% can be used to generate 83.3% (2: 1 area ratio), 75% (1: 1 area ratio), 66 · 7% (1: 2 area ratio) and other different gray levels. In addition, you can also use the gray scale of 50% and 0% to generate 33.3% (2: 1 area ratio), 25% (1: 1 area ratio), and 16.7% (1: 2 area ratio). And so on. Step 4: Use grayscale expansion technology and / or frame rate control

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Gray scale technical value. And a gamma parameter programmable gamma direct transmission Step 5: When the voltage is generated per horsepower, it is processed centrally until the correct action is performed. If the same invention is used for the foregoing, the following method can be used instead. Repeat the step test. The voltage and electricity are discarded until the data is determined to generate the circuit device 30. There must be a voltage 0. The grayscale extension method 1 and method 3 generate the grayscale steps 1 and 2 determined by the central processing unit 30 to determine the next step. A target voltage value of one. Then, the target voltage value obtained by the group generating circuit 60 is stored in the driver 10. One voltage, it is convenient to use the programmable gamma of the group. 〇 Adjust the output voltage to the target value, and then use the grayscale color block values required to set the next adjustment voltage until the 'gamma calibration is completed.' It is difficult to adjust the voltage for the gray-scale spreading technique that is close to full light and full darkness, so the gray-scale approach close to the whole party and full dark in this method 2 can adjust the gamma voltage. The bright and full dark gray scales of the springer are insulted by hi, and the method of invention is mainly related to the first and second methods. In the gray levels that are close to the full Brahma and the full dark, if the gray scale is still used (Spatial ^ then ng), it may be difficult to produce a fine gray scale: for example, in Figure 2 ^ the gamma reference voltage V and the relative brightness value of the v-hook are 2.5% ~ 6.9% and the reference / voltage V 戌 V is 9 as appropriate. 9.1% ~ 100%, etc., will be difficult to obtain by the aforementioned gray scale expansion. Therefore, the present invention proposes a method three, which is mainly carried out in the manner shown. Nine Among them, the adjustment method for the grayscale voltage close to the total darkness is: use Lou Lou ^ solid # Near the total darkness, the transmutation user adjusts the multiple dragon bribes

Page 18 559767 Case No. 89127906 Amendment V. Description of the Invention (16) For example, in addition to the three gray levels shown in Figure 9, such as 0%, if 5 gray levels are used, 0%, 2.5% of the gray levels can be used. Corresponding output voltage value, the brightness of other gray scales will also be adjusted with the voltage ^ until the user thinks that the changes of the multiple gray scales are smooth, according to the corresponding voltage value of the intermediate gray scale ， Using the method of capturing the internal difference of the year, find the Gamma voltage required when approaching the full dark gray level, and the digital code values of 5%, 7.5%, and 10%, such as 5%, 10%, etc. Digit code value). The output voltage value of the middle gray scale is adjusted by the user, that is, the output voltage value of 5%, and in most cases, the 10% wheel output value is adjusted with the output voltage value of 5%. Adjusted by the user, the attitude m is judged ^ [The user thinks that the three consecutive gray levels change most smoothly at this time, so it can be ^

The output voltage value of 5% of the middle gray scale is used to determine the wide value V 9, which is close to the full dark gray scale. … Electric I On the other hand, the adjustment method for the gray scale voltages near full brightness is: using a plurality of gray scales near full brightness to allow the user to adjust the corresponding output voltage of the middle gray scales of the multiple gray scales, The brightness of other gray levels is also adjusted according to the output voltage, until the user thinks that the change of the plurality of gray levels is the smoothest, according to the corresponding voltage value of the intermediate gray level, using the check and internal difference method, To find the required Gamma voltage target value when it is close to the full bright gray level, as shown in Figure 9, the bright area can use three gray levels of 90%, 95%, and 100%: the user can adjust the middle gray level. The output voltage value is adjusted by 95% until the user thinks that the changes of the three consecutive gray levels are the smoothest. Then, the middle gray level 95% is used to determine the corresponding voltage value V7, which is close to full brightness. Complete the adjustment of the grayscale reference voltages near full light and full dark. Correction of voltage value

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Chaba 89127906 V. Description of the invention (17) The method 4 'described in the present invention is mainly to directly adjust and adjust the external voltage value of the data driver. The steps include: Step, Step 1: Generate two gray scale color blocks, One is the color block generated by the gray scale expansion technique. 'The color block represents a specific gray level (d 1), and the other is a continuous rendering of the plain color block.' The 5 HB block is a color block adjusted by the user. The external voltage corresponding to the upper and lower is V (V 5), so that the values between the upper and lower are the same. Outside the distance, after adjusting the continuous day element to adjust the gray level of the color block, the brightness of the color block generated by the upscaling technology is added to the last corresponding voltage value to be the same as the color block generated by the previously generated gray level Represents a special picture plain color block. The upper and lower corresponding external voltages correspond to the gray scales in the corresponding voltage range to four, to obtain another gray scale correspondence and its corresponding driving voltage Vd ^ The gray scale conversion function, to obtain @ Step 2: The continuous day plain color The gray levels of the blocks (such as V and V 5) are set to be the same (that is, the gray levels in the corresponding lower voltage range. Step 3: The user observes the gray value of the color block at a certain level. When the user and the lower corresponding voltage value change accordingly Step 4: When the color block is visually equivalent to the grayscale extension, record and store (V dl). Step 5: Generate two grayscale brightness levels. One is the grayscale determined by the grayscale extension technology (d2 ), The other is the continuous step 6. Set the gray level of the continuous daytime plain color blocks to be the same, so that the values between them are the same; repeat the voltage value (Vd2) of step 3. Step 7: According to the two gray levels d 1 and d 2, Vd2, and with pre-built power

Page 20 559767 _Case No. 89127906_ Year and Month Revision_ V. Description of the Invention (18) External Gamma (Gamma) Reference Voltage; Step 8: Repeat the processing steps from Step 1 to Step 7 until all gray levels correspond to The voltage value is used as the input of the data driver to complete the correction operation. Second Embodiment: Use with Detectors The second embodiment of the present invention mainly considers the use of the system of the present invention, which can be further used in conjunction with existing products with detectors, so as to provide a low-cost device for display manufacturers. As needed, the gamma corrector of the display can be adjusted. The main circuit blocks are connected. Please refer to Figure 10. The circuit components are roughly the same as those shown in the first embodiment of Figure 5. The difference is that the detector 70 is added. The relationship between the components in FIG. 10 is described below, including an automatic gamma correction system 22 for outputting a plurality of adjustable gamma voltages. The automatic gamma correction system 22 further includes: at least one detector Detector 70 is used to measure the light energy emitted by the display; a central processing unit 30, an input end of which is connected to the output end of detector 70, thereby recording the measurement by detector 70. The light energy value, and calculate a new gamma reference voltage during the calibration process; an image generator 40, the input end of which is connected to the central processing unit 30, for generating at least two color patches (Gray Patches);- The memory 50 is connected to the central processing unit 30 and stores the voltage value calculated by the central processing unit 30 and related preset values of the pre-stored display reference voltage; a group of programmable gamma voltage generating circuits 60, which The input end is connected to the central processing unit 30, and according to the calculation result of the central processing unit 30, a plurality of gamma voltages are generated after conversion;

Page 21 559767 _Case No. 89127906_ Year and month correction __ _ V. Description of the invention (19) The data driver of the group 10 is individually connected to the programmable gamma voltage generating circuit 6 0 of the group. It is used to drive the display to display images. In the above, the central processing unit 30 determines the new gamma reference voltage after calculation based on the detection and comparison results of the detector 70 to avoid the loss of gray scale of the display. Among them, the detector 70 is used to replace the artificial eye to compare the light energy difference between the gray scales A and B in Fig. 7. Therefore, the adjustment of the window scroll is not used. In terms of the number of detectors 70, if the gray scales are displayed side by side, two detectors are used to individually detect the gray scales; or a single detector can be used in conjunction with one. The position shift motor device is switched to measure two color blocks. Another way to set the detection state 70 is to use a single 4 detector at the same time to display only one of the two grayscale patches. First, display a grayscale color patch A on the screen and measure its light energy value; then display another grayscale color patch B and measure its light energy value. Then, the light energy feedback of the gray-scale color block b is input to the CPU 30, and compared with the energy of the gray-scale color block A. If the comparison result is different, continue to adjust the corresponding digital code of the grayscale color block β, and measure the light energy value of the grayscale color block B again to compare until the light energy of the grayscale color block B is the same as the grayscale color. A block of human energy. Correct the gamma adjustment. As disclosed in the foregoing embodiment system and method, compared with the present invention, the features and advantages of the technical advancement of the present invention are described as follows: (1) For general users, it is not necessary to use Detectors can be used to calibrate gamma parameters, and users who are more suitable for general display crying can adjust the image quality. °°

Page 22 559767 Case No. 89127906 Amendment V. Description of the invention (20) (2) For the display manufacturer, the requirements of the detector do not need to be precise, and the gamma parameters can be corrected, and the system cost is low. (3) Correction by changing the external gamma reference voltage of the data driver without loss of grayscale. In summary, an automatic gamma correction system and method for a display that adjusts the reference voltage of a data driver according to the present invention can provide a user with a convenient way to adjust the gamma correction with low cost and avoid loss of grayscale. It fully shows that the purpose and effect of the present invention are deeply implemented and progressive, has great industrial use value, and is a new invention that has never been seen on the market today. It fully meets the requirements of an invention patent, and applies according to law. . The above are only the preferred embodiments of the present invention, and it should not be used to limit the scope of implementation of the present invention. That is to say, all equal changes and modifications made in accordance with the scope of the patent application of the present invention should still fall within the scope of the patent of the present invention.

Page 23 559767 _Case No. 89127906_ Year Month Date Amendment

Claims (1)

559767 This kind of "Automatic Gamma (iGamma) Correction System for Display Voltage Reference Voltage Drivers" includes: An automatic gamma correction system for outputting a plurality of adjustable gamma voltages. The system includes: In the calibration process, a new gamma reference voltage is calculated. The shirt image generator, whose input is connected to the central processing unit, generates at least two types of gray patches. The memory is connected to the The central processing unit stores a voltage value calculated by the central processing unit and a preset value of a test voltage of a pre-stored display; a group, and a type of gamma voltage generating circuit whose input end is connected to the central processing unit. According to the calculation result of the central processor, a plurality of gamma voltages are generated after conversion; the data driver of the group has its input terminal connected to the programmable gamma voltage generating circuit of the group individually to drive the display; The CPU is based on the voltage grayscale conversion characteristics and comparison results required by the data drivers in the group, and determines the new Gamma test power after calculation. Press' to produce a better image display effect and avoid the loss of gray scale of the display. As shown in item 1 of the scope of the patent application, the display driver ’s automatic gamma correction system that adjusts the reference voltage of the data driver, wherein the image is generated At least two color blocks produced, one of which is produced by one-dimensional (One Di mens ion) gray scale expansion technology (Spatial Dither ing) Page 559767 The other color block is a generator that directly drives a continuous pixel (continuus PiXe1s). 3. An automatic gamma correction system for a display device that adjusts a reference voltage of a data driver as described in item 丨 of the patent application scope, wherein the image generator generates at least two color patches, one of which is two-dimensional (Tw o Dimension) gray scale expansion technology (Spatial Dithering) produced by the 'color-blocks are directly driven by the continuous Pi (Continuous Pi X e 1 s) generator. 4 · The automatic gamma correction system for the display that adjusts the reference voltage of the data driver as described in item 1 of the patent claim, wherein the memory system is more robust to store at least one set of target grayscale conversion curves and the display is currently in operation. Gamma reference voltage value. 5 · A method for automatic gamma correction of the display by adjusting the reference voltage of the data driver, which uses two gray levels to generate gray blocks of any gray level by using gray level expansion technology. The steps include: (a) Generate two gray-scale color blocks, one is the color block generated by the gray-scale expansion technology, and the other is the continuous pixel block; (b) the user adjusts the continuous pixel block beyond a certain observation distance. The gray level value is recorded until the brightness of this color block and the color block generated by the gray level expansion technology are equal in visual perception; recording is performed by adding the gray level value d 1 and (c) to produce two gray levels with a brightness different from The previously generated gray scale color blocks are one generated by the gray scale expansion technology and the other is a continuous book plain color block; Page 26 559767 __Case No. 89127906_ Year Month Day Amendment __ Sixth, the scope of patent application (d) The user adjusts the grayscale value of the continuous pixel block of color in step (c) beyond a certain observation distance, Until the brightness of this color block is equal to the brightness of the color block generated by the gray scale expansion technology, the gray level value d 2 is recorded; (e) The two gray values are calculated by using a table lookup and internal difference method. Corresponding voltage values of steps d 1 and d 2; (f) Based on the two gray steps d 1 and d 2 and the pre-built voltage gray-scale conversion function, obtain the two outer, partial gamma (G amma) reference voltages Correct the target value; (g) Repeat steps (c) to (f) to obtain the gamma reference voltage correction target values for other gray levels; (h) After obtaining all the gamma reference voltage correction target values , Adjust the input voltage of the data driver of the display to the target voltage value, and store the adjusted Gamma voltage in the memory to complete the automatic gamma correction. 6 · The method for automatic gamma correction of a display device to adjust the reference voltage of a data driver as described in item 5 of the scope of patent application, wherein the two grayscale color blocks described in step & In the extended technology, 1: 1 full black and full white are used to generate a gray scale patch with a brightness of 50%; the other is a continuous gray patch with a single gray scale, which can perform real-time adjustment. 7 · The method for automatic gamma correction of a display device to adjust the reference voltage of a data driver as described in item 5 of the scope of the patent application, wherein the two grayscale color blocks described in step (c) are extended by grayscale Application of technology A certain proportion of all black and all white to produce a gray with a specific relative brightness different from 50% Page 27, 559767, No. 27, deletion number _ year month date _ amendment VI. Patent application scope ^ order color block, this specific relative brightness and 50% relative brightness Yunmen Bukou 卩 reference voltage regulated by the voltage range; another — With Flail Gold Master-> Blade Night Color Blocks are inverse π pixels earlier gray scale color blocks, whose gray scale value can be adjusted immediately. ”Η week, Asia can execute 8 · Adjust the reference voltage of the display without w as shown in item 5 of the patent scope. The reference voltage for automatic gamma correction of the display: After the voltage is adjusted, the data will be executed immediately. The method can also be a standard adjustment action, which is performed after performing the steps (the step of entering the voltage: u), and then performing step (g) to use a group of programmable gamma voltages to generate the two external parts of electricity (f). Gamma refers to welding, adjusts the step value ', and transmits the target voltage value to a t individual to a target; the data driver (h) of Bai Group determines the next reference value based on the pre-stored data driver. The corresponding gray level (1) of the automatic gamma correction is a gray level value determined by a central processing unit, and a gray level value of the block; are generated; ^ Each time a gray level extension technology (J) completes a corresponding The value of the gray scale, the program gamma voltage generating circuit drives the data by a% from the group to be adjusted to the target value, and then uses the central Yanjie ’s turn-in voltage to adjust the gray scale color blocks required for the voltage , Until == to decide the next good. Juice has electricity Gou set value 9.11 for adjusting the reference information display drive voltage cry (the Gamma) of the correction method, based on two human gamma I Laid ^ movable generated from any of ash 559767 __Case No. 891279QR year_ j --- "Wu Zheng-VI. The steps of applying for a patent range of color blocks include the following steps: (a) Generate two gray-level color blocks, one is generated by the gray-level expansion technology (B) the user adjusts the grayscale value of the continuous daytime plain color block beyond a certain observation distance until the color block and the grayscale extension technology produce When the brightness of the color block is visually relevant, the gray-scale value d 1 is recorded; (c) Two gray-scale brightness blocks different from the previously generated gray-scale color blocks are generated. One is generated by the gray-scale expansion technology. (D) The user adjusts the grayscale value of the continuous daytime plain color block in step (c) outside a certain observation distance until the color block and the grayscale level. When the degree of color block produced by the extended technology is equal in visual perception, record the gray level value d 2; calculate the two gray levels dl and d2 (e) Use the look-up table and internal difference method: Correspondence Voltage value; (f) Calculate the two external values according to the two gray levels dl and d2 and the pre-built electrical conversion function. Gamma: The value of the voltage gray is 1¾ revolutions. The gamma reference voltage correction target (g) uses a group of programmable gamma external gamma (Gamma) watchers to adjust the two target voltage values. Send to a group of 1U⑴ & — target value, and the (h) is stored in the pre-stored data driver 2 ^ data driver; the value determines the gray level $ 马 correction corresponding to the reference voltage of the next automatic unit 1: A. α; π and the gray value of the color block; 559767 ------ face 89127906 --- chrome date, patent application scope— "-(1) the gray-scale value determined by a central processing benefit is generated by gray-scale extension technology; ( j) After completing a corresponding gray level voltage value, the input voltage of the data driver is adjusted to the target value by the programmable gamma voltage generating circuit of the group, and then the central processor is used to determine the next voltage level. Adjust the gray scale color blocks required for the voltage until all voltage values are set to complete the correction action. 1 0 · The method for adjusting the display driver ’s automatic gamma correction as described in item 9 of the scope of patent application, wherein the gray scale of the color block required for the automatic gamma correction described in step (h) Value, which can use all black and white and a set gray level value, and then use the gray level value generated by the integer area ratio as the standard. Π · The method for automatic gamma correction of a display to adjust the reference voltage of a data driver as described in item 9 of the scope of the patent application, wherein the gray-scale value generated by the gray-scale expansion technique described in step (i) is a Another producer of frame rate control (Frame Rate Control). 1 2. The method for automatic gamma correction of a display device for adjusting a reference voltage of a data driver as described in item 9 of the scope of patent application, wherein the gray scale color block described in step (j) is for a gray scale close to full darkness The voltage adjustment method is: using multiple gray levels close to full darkness, allowing the user to adjust the corresponding output voltage of the middle gray levels of the multiple gray levels, and the brightness of other gray levels will also be adjusted with the output voltage. Change until the user thinks that the changes of the plurality of gray levels are the smoothest, according to the corresponding voltage value of the intermediate gray level, use a look-up table and the internal difference method to find a near full darkness Page 559767 Target value of Gamma voltage required in gray scale. 1 3 · The gray scale color block described in V4: actuator / test voltage of the auto-gamma correction (Ga_) correction of the display M as described in item 9 of the scope of the patent application, for the gray scale near full brightness, where Step (j) The formula is: using a plurality of gray levels close to full brightness, 'η adjustment method ^ Am -h TTth, B. Let: user S round the corresponding wheel of the middle gray levels of the plurality of gray levels. The brightness of the level will also be adjusted according to the output voltage. ^ = Wide ^ ,, t, the first toleration is that when the changes of the multiple gray levels are the smoothest, the aunt handle is called the corresponding level 7. The voltage value, using the look-up table and the internal difference method, the target value of Gamma voltage required when $ ^ ^, 彳 into ^ gray level. Welcome to the Water King π 14 · A display to adjust the reference voltage of the data driver /. The method of μ automatic gamma (Gamma) correction is to directly adjust the asset voltage value for correction. It includes: ^ w I Juice (a) Generate two gray scale color blocks, one by the gray scale buckle J Four? Since? The delta block produced by the delta display technology represents a specific gray level (di), and the other is a continuous pixel block. The color block is the color that the user wants to adjust: (b) continuous pixels The external voltages corresponding to the gray levels above and below the color block are set to be the same, so that the gray levels within the corresponding voltage range are the same; (c) the user adjusts the continuous distance outside a certain observation distance. The gray level value of the daytime plain color block. When the user adjusts the gray level of the color block, the corresponding upper and lower voltages will change accordingly. (D) When this color block and the gray scale generated by the gray scale extension technology When the brightness is equal to the visual perception, record the last corresponding voltage value Page 31 559767 _Case No. 89127906_ Modified Year_6. Application for Patent Range Storage (Vdl); (e) Generate two grayscale luminance blocks that are different from the previously generated grayscale color blocks. One is the grayscale extension technology. The generated color blocks represent a specific gray level (d2), and the other is a continuous daytime plain color block; (f) the external voltages corresponding to the upper and lower gray levels of the continuous daytime plain color block are set to be consistent, so that The grayscale values in the upper and lower corresponding voltage ranges are the same; repeat steps (c) to (d) to obtain another grayscale corresponding voltage value (Vd2); (g) according to the two grayscales dl and d2 , And its opposing driving voltages Vdl and Vd2, and with the pre-built voltage grayscale conversion function, two external gamma (Gamma) reference voltages are obtained; (h) Repeat the processing steps of steps (a) to (g) Until the voltage values corresponding to all gray levels are obtained and used as the input of the data driver, the correction operation is completed. 1 5. A display automatic gamma correction system for adjusting the reference voltage of a data driver, comprising: an automatic gamma correction system for outputting a plurality of adjustable gamma voltages, the system comprising: at least one A detector for measuring the light energy emitted by the display; a central processing unit having an input connected to the output of the detector to record the light energy value measured by the detector During the calibration process, a new gamma reference voltage is calculated. An image generator whose input terminal is connected to the central processing unit. Page 32 559767 _Case No. 89127906_ Modified Year_6. At least two kinds of color patches (Gray Patches) are generated in the scope of patent application; a memory connected to the central processing unit, which stores the calculations performed by the central processing unit. The voltage value and the preset value of the reference voltage of the pre-stored display; a group of programmable gamma voltage generating circuits, whose input end is connected to the central processing unit, and a plurality of gamma units are generated after conversion according to the calculation result of the central processing unit. Horse voltage; a group of data drivers whose input terminals are individually connected to the programmable gamma voltage generating circuit of the group to drive the display; in the above, the CPU is based on the detection and After comparing the results, a new gamma reference voltage is determined after calculation to produce a better image display effect and avoid the loss of gray scale of the display. 16. The automatic gamma correction system for the display, which adjusts the reference voltage of the data driver as described in item 15 of the scope of patent application, wherein the debt detector is set to two to match the two color blocks for side-by-side display. By. 1 7. The automatic gamma correction system for the display that adjusts the reference voltage of the data driver as described in item 15 of the scope of the patent application, wherein the detector is set as a single one, and a position shift motor is also used Switch to detect the two color blocks. 18. The automatic gamma correction system for the display that adjusts the reference voltage of the data driver as described in item 15 of the scope of the patent application, wherein the accumulator is set as a single one, and only the two are displayed at the same time. One of the color blocks, and then the other color block is displayed. Page 33