TWI355644B - Common voltage adjusting system and adjusting meth - Google Patents

Description

135564^^||^ ; TW3〇〇'6pA. 九,费明说明: a... Technical Field of the Invention The present invention relates to a common voltage adjustment system, and more particularly to a liquid crystal display panel A common voltage adjustment device that automatically corrects the common voltage by displaying a flickering situation of the screen. [Prior Art] The feed through effect means that the voltage level of the halogen electrode in the liquid crystal display is affected by the parasitic capacitance or storage capacitance on the thin film transistor (TFT) substrate, and a certain bias occurs. Shift, this offset is the penetration voltage. At this time, a correction corresponding to the feedthrough voltage is required for the common voltage (VC0M) of the liquid crystal display to prevent the common voltage from deviating from the positive polarity pixel voltage and the negative polarity pixel voltage of the liquid crystal display panel. The median value causes the LCD panel to display a flicker (Flicker) when the polarity is reversed. The conventional common voltage adjustment system observes the flicker of the liquid crystal display φ device by the human eye, and manually adjusts the common voltage according to the result sensed by the human eye. As such, the traditional common voltage regulation system requires a large amount of manpower and time to perform common voltage correction, which will result in higher cost of the liquid crystal display. 13.55644 Miscellaneous: tw3_pa, [Description of the Invention] In view of the above, the present invention provides a common voltage adjustment system and an adjustment method thereof, which can effectively improve the adjustment system of the conventional common voltage to judge the display surface by the human eye. The flickering situation and the need for a large amount of manpower have led to a costly problem. According to the present invention, a common voltage adjustment system is provided for use in a liquid crystal display panel (LCD panel) including a first luminance meter, a control device, and a common voltage rise and control unit. The first brightness meter is used to detect the brightness of the liquid crystal display panel, and according to the input voltage sensing signal. The control device is configured to receive the sensing voltage signal, and generate a first brightness change amplitude value and a control signal corresponding to the first brightness change amplitude value according to the sensing voltage signal. The common voltage lifting control unit is configured to receive the control signal and adjust the common voltage of the liquid crystal display panel according to the control signal. According to the present invention, a common voltage adjustment method is applied to a common voltage adjusting device for adjusting a common voltage of a liquid crystal display panel and causing a liquid crystal display panel to generate a display screen. This adjustment method includes the following steps. First, set the common voltage to the initial value. Then, the display surface is detected to obtain the brightness change amplitude value. Then, the common voltage is adjusted according to the brightness change amplitude value to reduce the brightness change amplitude value. Thereafter, when the luminance change amplitude value is the minimum value of the luminance change amplitude value, the common voltage is fixed. In order to make the above-mentioned contents of the present invention more comprehensible, a preferred embodiment will be described below, and in conjunction with the drawings, a detailed description is as follows:

Number: TW3006PA 1355644 [Free type] _ The common voltage adjustment system of the present invention is provided with a brightness meter to sense the display voltage of the liquid crystal display panel driven by the pixel voltage of a fixed pattern (a pattern that causes severe flicker) The brightness is used to judge the flickering of the display surface of the liquid crystal display panel. According to experience, the blinking of the display surface of the liquid crystal display panel is proportional to the brightness fluctuation of the display surface of the liquid crystal display panel. The common voltage adjustment system of the present invention converts the sensed result into a control signal to adjust the magnitude of the common voltage. The above operation is repeated until the brightness meter senses the brightness fluctuation of the display screen of the liquid crystal display panel to the minimum value, and the common voltage adjustment system sets and stores the common voltage at this time as a preferred common voltage. Please refer to FIG. 1 and FIG. 2 . FIG. 1 is a block diagram of a common voltage adjustment system 10 according to a preferred embodiment of the present invention. FIG. 2 is a common voltage Vc of the liquid crystal display panel 110 in FIG. 1 . The coordinate graph of the relationship with the peak signal Sdp. The common voltage adjustment system 10 is applied to the liquid crystal display panel 110 for correcting the common voltage Vc of the liquid crystal display panel 110 to a preferred electric value, and correcting the display surface of the liquid crystal display panel 110 by correcting the common electric dust Vc. , so that its flickering situation is essentially the slightest. The common voltage adjustment system 10 includes a common voltage rise control unit 114, a luminance meter 120, and a control device 130. In the present embodiment, a common voltage adjustment system 10 having a luminance meter 120 will be described as an example. The brightness meter 120 is configured to detect the brightness of the liquid crystal display panel 110 and generate a sensing voltage signal dSd accordingly. Wherein, the voltage of the sensing voltage signal dSd is sensed

135564^L^^ ·. TW3006PA One-two _ -ϋ Sdp彳 is related to the degree of fluctuation and the flicker of the display panel of the LCD panel. The control device (10) is configured to receive the sensing voltage signal dSd, and generate a pocket change amplitude value Si, which is related to the voltage threshold Sdp of the sensing voltage signal d^d and the flicker of the display screen of the liquid crystal display panel 1〇 The control unit 130 generates a control signal Sc by the control unit 138 according to the brightness change amplitude value, and the control unit 138 generates a control signal Sc for receiving the control signal & The control signal Sc adjusts the common voltage vc of the liquid crystal display panel, so that the blinking of the display surface of the liquid crystal display panel 10 changes correspondingly due to the change of the common voltage Vc. The peak signal Sdp, the luminance change amplitude value Si and the control signal Sc are correspondingly changed, and the common voltage rise control unit 114 repeatedly adjusts the common voltage according to the control signal Sc.

Vc. By repeating the above operation, the preferred common voltage Vopt corresponding to the minimum peak signal Sdpmin can be selected. As shown in Fig. 2, the voltage value of the common voltage Vc and the peak signal Lü _ ^ relationship curve C1 are substantially a concave upward parabola whose apex corresponds to the minimum peak signal Sdpmiii and the preferred voltage value v 〇 pt. At the same time, the blinking of the display surface of the liquid crystal display panel 110 is substantially the slightest: in this way, the common voltage Vc of the self-correcting liquid crystal display panel 110 and the display surface can be achieved via the common voltage adjustment system 1 of the embodiment. The effect of the situation. m Freshly in the present embodiment, the initial voltage value of the common voltage Vc is determined by the common electric power adjustment (four) system 101.

135564^^11^ :· TW3006PA . Value Vco, and increase the common voltage Vc voltage value to make the common voltage vc .Γ -. * one by one. = - ·. -——=- · - = -- -- . --------- The operation of the preferred voltage value Vopt gradually approaching the minimum value Vc_o of the adjustable power range is taken as an example. The control device 130 includes a peak detecting unit 132, an Analog To Digital (A/D) converting unit 134, a Micro Control Unit (MCU) 136, and a control unit 138. The peak detecting unit 132 receives the detected voltage signal dSd and senses its voltage peak to generate a peak signal Sdp. The relationship between the sense voltage signal dSd and the peak signal Sdp is as shown in FIG. 3, and the peak signal Sdp is, for example, proportional to the degree of flicker of the liquid crystal display panel 110. The analog digital conversion unit 134 is configured to receive the peak speech Sdp and perform an analog digital conversion thereof to generate a luminance change amplitude value Si. The micro control processing unit 136 receives and stores the luminance change amplitude value ^ and compares whether the luminance change amplitude value Si is less than or equal to the previous luminance change amplitude value. When the luminance variation amplitude value Si is less than or equal to the previous luminance variation amplitude value, it indicates that the common voltage Vc is less than the preferred electrical φ voltage value Vopt. At this time, the micro control processing unit 136 outputs the adjustment signal Sa. The micro control processing unit 136 outputs the reset signal Sr to the peak detecting unit 132' after the output of the adjustment signal sa, so that it can detect the voltage peak value Sdp of the sensing voltage signal dSd at the next moment. When Si is greater than the previous luminance change amplitude value, 'the common voltage Vc has exceeded the preferred voltage value v〇pt, and the voltage value of the common voltage Vc at the previous time is equal to the preferred voltage value Vopt. At this time, the micro control processing unit 136 outputs the adjustment signal Sa. and

I 355644r 华槔号·: TW3006PA • The micro control processing unit l36 outputs the adjustment signal Sa” at the next two times. The control unit 138 is configured to output the control signal Sc to the common voltage elevation control unit 114 according to the adjustment signals Sa and Sa. When the control unit 138 receives the adjustment signal Sa, the control unit 138 will adjust the control signal Sc to raise the common voltage Vc. When the control unit 138 receives the adjustment signal Sa, the control unit 138 will adjust the control signal Sc to The common voltage Vc is lowered. When the control unit 138 receives the adjustment signal Sa, the control unit 138 adjusts the control signal Sc to store the common voltage vc at this time. In short, the common voltage lifting control unit 114 is controlled according to the control. The signal Sc is used to increase or decrease or store the common voltage Vc. Referring to Figure 4, a flow chart of the common voltage adjustment method of the present embodiment is shown. First, as step 402, the common voltage Vc is set to an initial voltage value. In this embodiment, the initial value of the common voltage Vc is equal to the minimum value Vco of the adjustable voltage range. Then, as in step 404, the luminance meter 120 is a detecting liquid. The brightness of the display panel 110 is displayed to generate the sensing voltage signal dSd, and the peak detecting unit 132 and the analog digital converting unit 134 are used to respectively generate the peak signal Sdp and the brightness variation amplitude value Si. Then, as in the step 406, the micro control processing unit 136 stores the brightness change amplitude value Si, and determines whether the brightness change amplitude value Si is smaller than the first two brightness change amplitude values 'if yes, indicating that the common voltage Vc is less than the better voltage value Vopt, and the previous one The brightness change amplitude value is not equal to the minimum value of the brightness change amplitude value Si, that is, the previous peak signal is not equal to the minimum peak signal Sdpmin. Then step 408 is performed. In step 408, the micro control processing unit 136 outputs the adjustment signal %.

1355644^11^ ••.TW3006PA The drive control unit 138 adjusts the control signal Sc to raise the common voltage Vc. The micro control processing unit 136 further outputs a reset signal Sr to reset the peak detecting unit 132 so that it can detect the peak value of the sensing voltage signal at the next moment. Step 404 is then performed to detect the brightness of the display screen at the next moment via the luminance meter 120. In step 406, when the micro control processing unit 136 determines that the brightness change amplitude value Si is greater than the previous brightness change amplitude value, it indicates that the common voltage Vc is greater than the preferred voltage value Vopt, and the previous brightness change amplitude value is the brightness change amplitude value Si. The minimum value, that is, the previous peak signal is equal to the minimum peak signal Sdpmin of the peak value signal Sdp. Then step 410 is performed. In step 410, the micro control processing unit 136 outputs the adjustment signal Sa' to adjust the control signal Sc via the control unit 138, thereby lowering the common voltage Vc to be equal to the preferred voltage value Vopt. Then, in step 412, the micro control processing unit 136 outputs the adjustment signal Sa" at the next time to pass the control unit 138, so that the common voltage rise control unit 114 stores the common voltage Vc as a preferred common voltage. The liquid crystal display panel 110 is driven by a fixed positive polarity halogen voltage and a negative polarity voltage, and the preferred voltage value Vopt of the common voltage Vc is equal to the middle value of the positive polarity and the negative polarity halogen voltage. When the common voltage Vc is equal to the preferred voltage value Vopt, the brightness of the display surface of the liquid crystal display panel 110 is the lowest, and the blinking condition is also the slightest. In the embodiment, the peak detecting unit 132 can use, for example, the conventional The peak detector is implemented as shown in Fig. 5. The peak detecting unit 132 is 11

I35564^U^H^ ·: The TW3006PA consists of an Operational Amplifier, a capacitor, a Diode, and a switching circuit component that can receive the sensed voltage signal dSd and output its voltage peak. As the peak signal Sdj^ and the peak detection unit το 132, the reset signal Si*' can be received via the switching circuit component to discharge the current on the 1 capacitor, so that the peak detecting unit 132 can sense the next moment.电压 The voltage peak of the voltage signal and output the peak signal. In the practical example, the initial voltage value of the common voltage vc is set to the minimum value Ve of the adjustable voltage range. And through the rise of the total to make it read the good secret (4), and with the observation of the magnitude change of the magnitude of the change of the value of Si to find the common voltage ^ the preferred voltage value Vopt ', the common voltage adjustment system of this embodiment It is not limited to the above method to find the preferred voltage value Vopt of the common voltage Ve, but another method can be used to find the preferred voltage value V0pt of the common voltage 仏. For example, the initial voltage value of the common voltage Vc is set to the maximum value of its adjustable voltage range, and is brought closer to its preferred voltage value v?pt by gradually decreasing the common voltage Vc. The common voltage adjustment system 1 of the present embodiment can automatically correct the voltage value of the common voltage Vc by detecting the brightness fluctuation of the liquid crystal display panel 110. However, the common voltage adjustment system 10 of the embodiment may further include a manual control unit 140. By retaining the operating mechanism j that can manually adjust the common voltage Vc, the user can further adjust the relevant parameters of the common voltage adjustment system 10, such as the value of the step voltage, via the manual control unit 14A. In the present embodiment, the luminance of the liquid crystal display panel 11Q is only included in the common voltage adjustment system 10 as an example 12

1355644 达号: · TW3O06PA Description, however, the common voltage adjustment system 1 is not limited to 包括 including one luminance meter 120 and may include two or more brightness = meter. For example, the common voltage adjustment system 1 of the present embodiment is provided with nine brightness meters 120 to simultaneously sense the brightness of nine different regions of the liquid crystal display panel 1. The common voltage adjustment system 1 of the present embodiment further has nine peak detecting units 132 and analog digital converting units 134 corresponding to the nine luminance meters 120 to respectively generate nine peak signals Sdp and nine shells respectively. The degree of change in amplitude is Si. The micro-control processing unit 136 of the common voltage adjustment system 1 of the present embodiment can perform weighted statistics on the nine luminance change amplitude values Si according to an algorithm (Alg〇rithm) to obtain a statistical brightness change amplitude value. The micro control processing unit 136 can further determine the statistical brightness change amplitude value equal to the minimum value according to the magnitude relationship between the statistical brightness change amplitude value and the previous statistical brightness change amplitude value, and the corresponding common pressure value is preferably set to be the best. The voltage value is v〇pt. The common voltage adjustment system of the present embodiment and the adjustment method thereof are used to sense the flickering situation of the display screen of the liquid crystal display panel by using a trueness meter = ^ sensing voltage signal. The common voltage of the embodiment adjusts the peak value of the sensing voltage signal to generate a control signal to adjust the common voltage of the display, and adjusts the liquid liquid=displaying the surface by adjusting the common voltage. In this repeated operation day, the day ^^^ corrects the common voltage to be the preferred value, and the flashing of the liquid crystal display surface == surface is substantially the slightest. JJ is not so, the common electric seat adjustment system of the embodiment and the effective improvement of the traditional common electric* adjustment system need to be limited by people.

I 3 5 5644: TW3006PA _ The flashing situation of the face is caused by a large amount of manpower and time to use. Wide. = · . - . =-- . 2 =. · .. · 2...—— ' . ^ - - . — ^ ^ ' __ The common voltage of the liquid crystal display panel and the flickering situation and cost of the display surface are high, and the common voltage can be automatically corrected according to the magnitude of the brightness variation amplitude value. The value. In this way, the common voltage adjustment system and the adjustment method thereof of the embodiment have the advantages of automatically adjusting the common voltage of the liquid crystal display panel and displaying the flickering situation of the kneading surface, saving cost, and displaying the flickering situation of the kneading surface. . In view of the above, the present invention has been disclosed in a preferred embodiment, and is not intended to limit the present invention. A person skilled in the art having the knowledge of the present invention can make various changes and refinements without departing from the spirit and scope of the invention. Therefore, the scope of the invention is defined by the scope of the appended claims.

13556443⁄43⁄4 : .TW300.6PA [Simple Description of the Drawings] FIG. 1 is a block diagram of a common voltage regulating system 10 in accordance with a preferred embodiment of the present invention. Fig. 2 is a graph showing the relationship between the common voltage Vc of the liquid crystal display panel 110 and the peak signal Sdp in Fig. 1. Fig. 3 is a timing chart showing the sense voltage signal dSd and the peak signal Sdp in Fig. 1. Fig. 4 is a flow chart showing the method of adjusting the common voltage of the embodiment. • Fig. 5 is a detailed circuit diagram of the peak detecting unit 132 in Fig. 1.

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13 55644三慰ι号': TW3006PA [Main component symbol description] 10: Common voltage adjustment system 110. Liquid crystal display panel 112: Embedded system 114: Common voltage rise control unit 120: Luminance meter 130: Control device 132: Peak value Detection unit 134: analog digital conversion unit • 136: micro control processing unit 138: control unit 140: manual control unit dSd: sensing voltage signal Sdp: peak signal Sdpmin: minimum value of peak signal Si: brightness variation amplitude value Sa, Sa', Sa": Adjust Signal® Sr: Reset Signal

Sc : control signal Vc : common voltage

Vopt: the preferred voltage value of the common voltage Vco: the minimum value of the adjustable range of the common voltage C1: curve 402~412: operation steps

Claims (1)

1355644 July 15, 100 revised replacement page 10: Shen # patent ft®: - a... 1. A common voltage adjustment system applied to a liquid crystal display panel (LCD Panel), the common voltage adjustment system The method includes: a first brightness meter for detecting brightness of the liquid crystal display panel, and outputting a sensing voltage signal; a control device for receiving the sensing voltage signal, and generating according to the sensing voltage signal a first brightness change amplitude value and a control signal corresponding to the first brightness change amplitude value; and a common voltage rise control unit for receiving the control signal, and adjusting or storing the liquid crystal display panel according to the control signal a common voltage; wherein the control device includes a Micro Control Unit (MCU) for receiving and storing the first brightness change amplitude value, the micro control processing unit is configured to compare the first brightness change The amplitude value and the previous first brightness change amplitude value are used to output an adjustment signal. 2. The common voltage adjustment system of claim 1, wherein the control device further comprises: a first peak detecting unit configured to receive the sensing voltage signal and according to the voltage of the sensing voltage signal a peak to output a peak signal; a first analog to digital (A/D) conversion unit for receiving the peak signal and outputting the first brightness change amplitude value; and a control unit for Adjusting the signal to output the control signal to the common voltage lifting control unit to adjust or store the common voltage; 17 1355644 July 15, 100 revised replacement page, wherein the micro control processing unit is further configured to output the adjustment signal, Outputting a reset signal to the peak detecting unit or outputting another adjusting signal to the control unit 'so that the peak detecting unit senses a voltage peak of the next sensing voltage signal or causes the common voltage lifting control unit to store the Common voltage. 3. The adjustment system of claim 2, wherein the micro control processing unit outputs the control signal to increase the first brightness change amplitude value when the first brightness change amplitude value is smaller than the previous one. The common voltage, and the micro control processing unit outputs the control signal to decrease the common voltage when the first brightness change amplitude value is greater than the previous-first brightness change amplitude value. 4. The adjustment system of claim 2, wherein the adjustment system further comprises a second brightness meter, a second value detection unit, and a second analog number unit, the micro control unit Further performing an arithmetic-statistic algorithm to read the first brightness change towel value and the second number read through the first and the second brightness meter, the peak detecting unit, and the analog-to-digital number The brightness change amplitude value is weighted and statistically obtained to obtain a statistical brightness change amplitude value. 5. The adjustment system of claim 4, wherein the micro control processing unit outputs the adjustment signal and the reset signal when the statistical brightness change amplitude value is not greater than a previous statistical brightness change amplitude value. 6. The adjustment system of claim 4, wherein the micro control processing unit outputs the control signal to increase the common power when the brightness change amplitude value is less than a previous statistical brightness change amplitude value. 1355644 Two,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,, The control signal is used to reduce the common voltage. 7. A common voltage adjustment method, the adjustment method is applied to a common voltage adjustment device to adjust the common electric house of one of the positive liquid crystal panels, so that the liquid crystal display panel is not produced. The adjustment method includes: (a) setting the common voltage as an initial value; (b) measuring the display surface to obtain a brightness change amplitude value; ▲ (c) adjusting the common voltage according to the brightness change amplitude value to reduce the party degree change amplitude value 'and determining whether the brightness change amplitude value is the minimum value thereof; and 〃 (4) when the brightness change amplitude value is the brightness change value When the amplitude value is the minimum value, the common voltage is fixed. 8. The adjustment method as described in item 7 of the patent application's initial value is the minimum value of the common voltage. ° 9. The adjustment method described in claim 7 wherein step (b) comprises: (bl) detecting the brightness of the display surface to obtain a sensing voltage number; ° (b2) detecting The voltage peak of the sensing voltage signal is measured to output a value signal; and (b3) the analog signal is converted to the analog signal to change the amplitude value of the brightness. 10. The adjustment method according to item 7 of the patent application scope, wherein the step (c) includes: 19 丄 644 7 曰 100 100 100 曰 曰 曰 曰 曰 曰 曰 曰 储存 储存 储存 储存 储存 储存 储存 储存 储存 储存 储存 储存 储存 储存 储存Whether the brightness change amplitude value is the minimum value of the brightness change amplitude value; (c2) when the brightness change amplitude value is not the minimum value of the brightness change amplitude value, 'rounding an adjustment signal; (c3) according to the adjustment signal Outputting a control signal to correct the voltage value of the common voltage, and outputting a reset signal after outputting the control signal; and (c4) repeating steps (b) to (ci). 11. The adjustment method according to claim 10, after the step (cl), further comprising: n(c2) setting the common voltage when the brightness change amplitude value is equal to the minimum value of the brightness change amplitude value A common voltage corresponding to the minimum value of the luminance change amplitude value. 1355644 Two:! Sdp / ί :ίΐΐ — ί 1 7 Ding Factory FT7 A ' * / ; m ^ % i 4 dSd