CN101271671A - Ghost eliminating circuit and method thereof and display control circuit - Google Patents

Ghost eliminating circuit and method thereof and display control circuit Download PDF

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CN101271671A
CN101271671A CNA2007100882740A CN200710088274A CN101271671A CN 101271671 A CN101271671 A CN 101271671A CN A2007100882740 A CNA2007100882740 A CN A2007100882740A CN 200710088274 A CN200710088274 A CN 200710088274A CN 101271671 A CN101271671 A CN 101271671A
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voltage signal
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detection circuit
voltage
circuit
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CN101271671B (en
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毕文嘉
张咏青
罗炎国
苏可青
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Advanced Analog Technology Inc
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    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
    • G09G3/3611—Control of matrices with row and column drivers
    • G09G3/3674—Details of drivers for scan electrodes
    • G09G3/3677—Details of drivers for scan electrodes suitable for active matrices only

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Abstract

The image sticking elimination circuit comprises a detection circuit and a change-over switch connected to the detection circuit. The detection circuit is used for detecting a first voltage signal which changes rapidly along with a voltage source and a reference voltage signal which changes slowly along with the voltage source. When the detection circuit determines that the first voltage signal is lower than a first threshold, then the switch switches the gate of the driving transistor to a second voltage signal that varies slowly with the voltage source. When the detection circuit determines that the reference voltage signal is below a second threshold, then the gate of the drive transistor is switched to a low voltage source.

Description

残影消除电路和其方法及其显示器控制电路 Afterimage elimination circuit and its method and its display control circuit

技术领域 technical field

本发明涉及一种残影消除电路，尤其涉及一种在关机时维持栅极电压以消除残影的电路。The invention relates to a residual image elimination circuit, in particular to a circuit for maintaining grid voltage to eliminate residual image when shutting down.

背景技术 Background technique

一般市面上的液晶显示器在关闭电源时会残留图像。如图1所示是常规的液晶显示器像素阵列和控制电路，其中栅极驱动电路11用于控制驱动晶体管16的栅极信号。当所述驱动晶体管16的栅极为高电压时，那么数据驱动电路12将电荷写入像素阵列13的存储电容器14，或将电荷从存储电容器14移出。由于存储电容器14并联到液晶胞(1iquid cell)15，因此存储电容器14的电荷存储和释放就同步于液晶胞15的图像数据读取与写入。当电压源VDD瞬间切断时，负责控制像素阵列数据信号读写的驱动晶体管16的栅极电压VGH也随之进入低电压。由于存储电容器14的电荷在电压源切断后无法释放，因此产生残留图像的问题。Generally, LCD monitors on the market will have a residual image when the power is turned off. As shown in FIG. 1 is a conventional liquid crystal display pixel array and control circuit, wherein the gate drive circuit 11 is used to control the gate signal of the drive transistor 16 . When the gate of the driving transistor 16 is at a high voltage, the data driving circuit 12 writes charges into the storage capacitor 14 of the pixel array 13 or removes charges from the storage capacitor 14 . Since the storage capacitor 14 is connected in parallel to the liquid cell (liquid cell) 15 , the charge storage and release of the storage capacitor 14 is synchronized with the image data reading and writing of the liquid cell 15 . When the voltage source V DD is cut off instantaneously, the gate voltage V GH of the driving transistor 16 responsible for controlling the reading and writing of the pixel array data signal also enters a low voltage. Since the charge of the storage capacitor 14 cannot be released after the voltage source is cut off, a residual image problem arises.

图2是常规的残影发生时序图。当电压源VDD瞬间切断时，如标号21的位置，栅极电压VGH也随之进入低电压，如标号22的位置。由于栅极电压VGH进入低电压后使存储电容器14的电荷无法释放，因此产生残留图像的问题。FIG. 2 is a conventional timing diagram of afterimage generation. When the voltage source V DD is cut off instantaneously, as shown in the position marked 21 , the gate voltage V GH also enters a low voltage, as shown in the position marked 22 . Since the charge of the storage capacitor 14 cannot be released after the gate voltage V GH becomes low, the problem of residual image occurs.

本国专利申请第94125836号和第93137423号揭示一种常规的残影消除电路，所述残影消除电路是在电压源VDD瞬间切断时强迫将栅极电压维持在高电平，且即便在残影消除后仍维持在高电平一段不短的时间。因此所述常规方法虽然可消除残影，但可能有其它噪声在所述段高电平时间内进入所述存储电容器，从而产生其它的噪声。National patent applications No. 94125836 and No. 93137423 disclose a conventional afterimage elimination circuit. The afterimage elimination circuit is forced to maintain the gate voltage at a high level when the voltage source V DD is cut off instantaneously, and even in the afterimage After the shadow is eliminated, it still maintains a high level for a short period of time. Therefore, although the conventional method can eliminate image sticking, other noises may enter the storage capacitor during the high level time, thereby generating other noises.

发明内容 Contents of the invention

本发明的残影消除电路和其方法及其显示器控制电路是为了有效消除常规显示器在关机时残留图像的问题。The residual image elimination circuit and its method and display control circuit of the present invention are to effectively eliminate the residual image problem of conventional displays when they are turned off.

本发明的残影消除电路包含检测电路、第一切换开关和第二切换开关。所述检测电路包含第一检测电路和第二检测电路，所述第一检测电路用于检测随电压源迅速变动的第一电压信号，所述第二检测电路用于检测随电压源缓慢变动的参考电压信号。所述第一切换开关的两端分别连接到栅极电压和随电压源缓慢变动的第二电压信号。所述第二切换开关的两端分别连接到所述栅极电压和低电压源。当第一检测电路判定所述第一电压信号低于第一阈值时，那么启动第一切换开关且关闭第二切换开关。当第二检测电路判定所述参考电压信号低于第二阈值时，那么启动第二切换开关且关闭第一切换开关。The afterimage elimination circuit of the present invention includes a detection circuit, a first switch and a second switch. The detection circuit includes a first detection circuit and a second detection circuit, the first detection circuit is used to detect the first voltage signal that changes rapidly with the voltage source, and the second detection circuit is used to detect the first voltage signal that changes slowly with the voltage source Reference voltage signal. Both ends of the first switch are respectively connected to the gate voltage and the second voltage signal which varies slowly with the voltage source. Two ends of the second switching switch are respectively connected to the gate voltage and a low voltage source. When the first detection circuit determines that the first voltage signal is lower than the first threshold, then activate the first switch and close the second switch. When the second detection circuit determines that the reference voltage signal is lower than the second threshold, then activate the second switch and close the first switch.

本发明的残影消除方法包含检测随电压源迅速变动的第一电压信号和随电压源缓慢变动的参考电压信号。当判定所述第一电压信号比正常工作电压低第一阈值时，那么将驱动晶体管的栅极切换到随电压源缓慢变动的第二电压信号。当判定所述参考电压信号低于第二阈值时，那么将所述栅极切换到低电压电平。The image sticking elimination method of the present invention includes detecting the first voltage signal which varies rapidly with the voltage source and the reference voltage signal which varies slowly with the voltage source. When it is determined that the first voltage signal is lower than the normal operating voltage by the first threshold, then the gate of the drive transistor is switched to the second voltage signal that varies slowly with the voltage source. When it is determined that the reference voltage signal is lower than a second threshold, then switching the gate to a low voltage level.

本发明的显示器控制电路可利用残影消除电路、存储电容器和驱动晶体管组成。其中所述残影消除电路的输出连接到所述驱动晶体管的栅极。The display control circuit of the present invention can be composed of an afterimage elimination circuit, a storage capacitor and a driving transistor. Wherein the output of the afterimage elimination circuit is connected to the gate of the driving transistor.

附图说明 Description of drawings

图1是常规的液晶显示器像素阵列和控制电路示意图；Fig. 1 is a conventional liquid crystal display pixel array and a schematic diagram of a control circuit;

图2是常规的栅极电压在关机时的时序图；Figure 2 is a timing diagram of a conventional gate voltage during shutdown;

图3是本发明的残影消除电路；Fig. 3 is the afterimage elimination circuit of the present invention;

图4是本发明的第二电压信号所检索的电荷泵电路；Fig. 4 is the charge pump circuit retrieved by the second voltage signal of the present invention;

图5是本发明的栅极电压在关机时的时序图；和Fig. 5 is the timing diagram of gate voltage of the present invention when shutting down; and

图6(a)～6(d)是本发明的第一切换开关和第一切换开关的电路图。6( a ) to 6 ( d ) are circuit diagrams of the first changeover switch and the first changeover switch of the present invention.

具体实施方式 Detailed ways

图3是本发明的残影消除电路30的一个实施例，其包含检测电路33、第一切换开关31和第二切换开关32。所述检测电路33包含第一检测电路34和第二检测电路35。所述第一检测电路34用于检测随电压源迅速变动的第一电压信号，而所述第二检测电路35用于检测随电压源缓慢变动的参考电压信号。当第一检测电路34判定所述第一电压信号比正常工作电压低到第一阈值(例如降低到UVLO电平，请参考图5)时，那么输出控制信号以启动所述第一切换开关31，且关闭所述第二切换开关32。第一切换开关31的源极和漏极分别连接到随电压源缓慢变动的第二电压信号(例如电荷泵电路)和栅极电压VGH。在切换到第一切换开关31后，第二检测电路35就持续检测随电压源缓慢变动的参考电压信号。一般来说，在模拟电路设计中经常为配合各种不同的模块而设计与其搭配的参考电压信号，本发明可挑选随电压源缓慢变动的参考电压信号而加以运用。当第二检测电路35判定所述参考电压信号低于第二阈值(例如降低到0.7伏电平，请参考图5)时，那么输出控制信号以启动第二切换开关32，且关闭第一切换开关31。第二切换开关32的源极和漏极分别连接到低电压电平(例如接地)和所述栅极电压VGH。FIG. 3 is an embodiment of the afterimage elimination circuit 30 of the present invention, which includes a detection circuit 33 , a first switch 31 and a second switch 32 . The detection circuit 33 includes a first detection circuit 34 and a second detection circuit 35 . The first detection circuit 34 is used for detecting the first voltage signal which changes rapidly with the voltage source, and the second detection circuit 35 is used for detecting the reference voltage signal which changes slowly with the voltage source. When the first detection circuit 34 determines that the first voltage signal is lower than the normal operating voltage to the first threshold (for example, to the UVLO level, please refer to FIG. 5 ), then output a control signal to activate the first switch 31 , and the second switch 32 is turned off. The source and drain of the first switch 31 are respectively connected to a second voltage signal (such as a charge pump circuit) that varies slowly with a voltage source and a gate voltage V GH . After switching to the first switching switch 31 , the second detection circuit 35 continues to detect the reference voltage signal that varies slowly with the voltage source. Generally speaking, in the design of analog circuits, reference voltage signals are often designed to cooperate with various modules. The present invention can select and use reference voltage signals that vary slowly with the voltage source. When the second detection circuit 35 determines that the reference voltage signal is lower than the second threshold (for example, down to 0.7 volt level, please refer to FIG. 5 ), then output a control signal to activate the second switch 32, and close the first switch. Switch 31. The source and drain of the second toggle switch 32 are respectively connected to a low voltage level (eg ground) and the gate voltage V GH .

图4是本发明的第二电压信号所检索的电荷泵电路41。所述电荷泵电路41由于具有储能元件，例如电容器或比较放大器，因此即便电压源已切断，仍可保持较高的电压值。FIG. 4 is the charge pump circuit 41 retrieved by the second voltage signal of the present invention. Since the charge pump circuit 41 has an energy storage element, such as a capacitor or a comparison amplifier, even if the voltage source is cut off, it can still maintain a relatively high voltage value.

图5是本发明的栅极电压在关机时的时序图，其中VDD代表电压源，VREF代表参考电压，VGH代表栅极电压。当VDD小于UVLO电平时，栅极电压VGH就经由第一切换开关31而由所述电荷泵电路41检索第二电压信号，其中所述第二电压信号电平虽然也随电压源的切断而略有降低，但仍可开启液晶显示器像素阵列的驱动晶体管16，而存储电容器14的电荷因此得以释放，藉此本发明可解决残留图像的问题。FIG. 5 is a time sequence diagram of the gate voltage of the present invention when it is turned off, wherein V DD represents a voltage source, V REF represents a reference voltage, and V GH represents a gate voltage. When V DD is less than the UVLO level, the gate voltage V GH retrieves the second voltage signal from the charge pump circuit 41 via the first switch 31, wherein the second voltage signal level also follows the cut-off of the voltage source However, the driving transistor 16 of the pixel array of the liquid crystal display can still be turned on, and the charge of the storage capacitor 14 can be released, so that the present invention can solve the problem of residual image.

图6(a)～6(d)是本发明的第一切换开关31和第二切换开关32的实施例。本发明的第一切换开关31和第二切换开关32可分别为P型晶体管和N型晶体管、P型晶体管和P型晶体管、N型晶体管和N型晶体管、P型晶体管和P型晶体管的组合。本发明对其组合并未特别加以限定。6(a)-6(d) are embodiments of the first switch 31 and the second switch 32 of the present invention. The first changeover switch 31 and the second changeover switch 32 of the present invention can be the combination of P-type transistor and N-type transistor, P-type transistor and P-type transistor, N-type transistor and N-type transistor, P-type transistor and P-type transistor respectively . The present invention is not particularly limited to its combination.

本发明的技术内容和技术特点已揭示如上，然而所属领域的技术人员仍可能基于本发明的教示和揭示而做种种不脱离本发明精神的替换和修改。因此，本发明的保护范围应不限于实施例所揭示的内容，而应包括各种不脱离本发明的替换和修改，并为所附权利要求书所涵盖。The technical content and technical features of the present invention have been disclosed above, but those skilled in the art may still make various replacements and modifications based on the teaching and disclosure of the present invention without departing from the spirit of the present invention. Therefore, the protection scope of the present invention should not be limited to the contents disclosed in the embodiments, but should include various replacements and modifications that do not depart from the present invention, and are covered by the appended claims.

Claims (10)

1. 一种残影消除电路，其特征在于包含：1. A residual image elimination circuit is characterized in that comprising: 检测电路，其包含第一检测电路和第二检测电路，所述第一检测电路用于检测随电压源迅速变动的第一电压信号，所述第二检测电路用于检测随电压源缓慢变动的参考电压信号；A detection circuit, which includes a first detection circuit and a second detection circuit, the first detection circuit is used to detect the first voltage signal that changes rapidly with the voltage source, and the second detection circuit is used to detect the voltage signal that changes slowly with the voltage source Reference voltage signal; 第一切换开关，其两端分别连接到栅极电压和随电压源缓慢变动的第二电压信号；和a first switch, the two ends of which are respectively connected to the gate voltage and the second voltage signal which varies slowly with the voltage source; and 第二切换开关，其两端分别连接到所述栅极电压和低电压源；a second switch, the two ends of which are respectively connected to the gate voltage and the low voltage source; 其中，当所述第一检测电路判定所述第一电压信号低于第一阈值时，那么启动所述第一切换开关且关闭所述第二切换开关；当所述第二检测电路判定所述参考电压信号低于第二阈值时，那么启动所述第二切换开关且关闭所述第一切换开关。Wherein, when the first detection circuit determines that the first voltage signal is lower than the first threshold, then activate the first switch and close the second switch; when the second detection circuit determines that the When the reference voltage signal is lower than the second threshold, the second switch is activated and the first switch is closed. 2. 根据权利要求1所述的残影消除电路，其特征在于所述第二电压信号是从电荷泵电路检索的。2. The afterimage cancellation circuit of claim 1, wherein the second voltage signal is retrieved from a charge pump circuit. 3. 根据权利要求1所述的残影消除电路，其特征在于所述第一切换开关为P型晶体管，而所述第二切换开关为N型晶体管。3. The afterimage elimination circuit according to claim 1, wherein the first switch is a P-type transistor, and the second switch is an N-type transistor. 4. 根据权利要求1所述的残影消除电路，其特征在于所述第一切换开关为P型晶体管，而所述第二切换开关为P型晶体管。4. The afterimage elimination circuit according to claim 1, wherein the first switch is a P-type transistor, and the second switch is a P-type transistor. 5. 根据权利要求1所述的残影消除电路，其特征在于所述第一切换开关为N型晶体管，而所述第二切换开关为N型晶体管。5. The afterimage elimination circuit according to claim 1, wherein the first switch is an N-type transistor, and the second switch is an N-type transistor. 6. 根据权利要求1所述的残影消除电路，其特征在于所述第一切换开关为P型晶体管，而所述第二切换开关为P型晶体管的组合。6. The afterimage elimination circuit according to claim 1, wherein the first switch is a P-type transistor, and the second switch is a combination of P-type transistors. 7. 一种显示器控制电路，其特征在于包含：7. A display control circuit, characterized in that it comprises: 存储电容器；storage capacitor; 驱动晶体管，其具有栅极，其中所述驱动晶体管的一端连接到所述存储电容器；a drive transistor having a gate, wherein one end of the drive transistor is connected to the storage capacitor; 检测电路，其用于检测随电压源迅速变动的第一电压信号和随电压源缓慢变动的参考电压信号；和a detection circuit for detecting a first voltage signal that varies rapidly with a voltage source and a reference voltage signal that varies slowly with a voltage source; and 切换开关，其连接到所述检测电路，其中当所述检测电路判定所述第一电压信号低于第一阈值时，那么将所述驱动晶体管的栅极切换到随电压源缓慢变动的第二电压信号；当所述检测电路判定所述参考电压信号低于第二阈值时，那么将所述驱动晶体管的栅极切换到低电压源。a switch, which is connected to the detection circuit, wherein when the detection circuit determines that the first voltage signal is lower than the first threshold, then the gate of the drive transistor is switched to a second voltage that varies slowly with the voltage source. voltage signal; when the detection circuit determines that the reference voltage signal is lower than a second threshold, then switch the gate of the drive transistor to a low voltage source. 8. 根据权利要求7所述的显示器控制电路，其特征在于所述第二电压信号是从电荷泵电路检索的。8. The display control circuit of claim 7, wherein the second voltage signal is retrieved from a charge pump circuit. 9. 一种残影消除方法，其用于控制显示器的驱动晶体管，其特征在于所述方法包含以下步骤：9. A method for removing residual image, which is used to control the driving transistor of display, it is characterized in that said method comprises the following steps: 检测随电压源迅速变动的第一电压信号和随电压源缓慢变动的参考电压信号；Detecting a first voltage signal that varies rapidly with a voltage source and a reference voltage signal that varies slowly with a voltage source; 当判定所述第一电压信号低于第一阈值时，那么将所述驱动晶体管的栅极切换到随电压源缓慢变动的第二电压信号；和When it is determined that the first voltage signal is lower than a first threshold, then switching the gate of the drive transistor to a second voltage signal that varies slowly with a voltage source; and 当判定所述参考电压信号低于第二阈值时，那么将所述栅极切换到低电压电平。When it is determined that the reference voltage signal is lower than a second threshold, then switching the gate to a low voltage level. 10. 根据权利要求9所述的残影消除方法，其特征在于所述第二电压信号是从电荷泵电路检索的。10. The image sticking method according to claim 9, wherein the second voltage signal is retrieved from a charge pump circuit.
CN2007100882740A 2007-03-22 2007-03-22 Ghost eliminating circuit and method thereof and display control circuit Expired - Fee Related CN101271671B (en)

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US8537150B2 (en) 2008-07-29 2013-09-17 Hannstar Display Corporation Method and control board for eliminating power-off residual images in display and display using the same
WO2015010360A1 (en) * 2013-07-23 2015-01-29 合肥京东方光电科技有限公司 Circuit, method and display for eliminating shutdown image sticking
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CN101739967B (en) * 2008-11-12 2012-11-07 瀚宇彩晶股份有限公司 Method for eliminating residual image after shutdown of display, control panel and display thereof
US8305372B2 (en) 2009-04-29 2012-11-06 Au Optronics Corporation Display and method for eliminating residual image thereof
CN102968975A (en) * 2012-12-10 2013-03-13 京东方科技集团股份有限公司 Liquid crystal display device and gate driving circuit voltage control method and control circuit thereof
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US9865204B2 (en) 2013-07-23 2018-01-09 Boe Technology Group Co., Ltd. Circuit and method for eliminating shutdown after-image, and display device
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