WO2018196079A1 - 驱动电路及显示装置 - Google Patents

驱动电路及显示装置 Download PDF

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Publication number
WO2018196079A1
WO2018196079A1 PCT/CN2017/085873 CN2017085873W WO2018196079A1 WO 2018196079 A1 WO2018196079 A1 WO 2018196079A1 CN 2017085873 W CN2017085873 W CN 2017085873W WO 2018196079 A1 WO2018196079 A1 WO 2018196079A1
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Prior art keywords
resistor
controllable switch
switch
driving circuit
display area
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English (en)
French (fr)
Inventor
宋文庆
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Wuhan China Star Optoelectronics Technology Co Ltd
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Wuhan China Star Optoelectronics Technology Co Ltd
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Priority to US15/540,977 priority Critical patent/US10304370B2/en
Publication of WO2018196079A1 publication Critical patent/WO2018196079A1/zh
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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
    • G09G3/2003—Display of colours

Definitions

  • the present invention relates to the field of display technologies, and in particular, to a driving circuit and a display device.
  • Typical reflective display devices include red, green, and blue color filters and reflective display layers. Reflective display layers are positioned beneath the color filters to selectively reflect light passing through the color filters to cause the reflective display device to display an image.
  • the display color of the existing reflective display device is 64 colors, and the number of display colors is small, so the displayed image needs to be improved in fineness, beauty and level.
  • the technical problem to be solved by the present invention is to provide a driving circuit and a display device to increase the number of display colors, thereby making the displayed image more delicate, beautiful and hierarchical.
  • a technical solution adopted by the present invention is to provide a driving circuit, the driving circuit includes a driving chip, a first controllable switch and a resistor, and the first pin of the driving chip is connected to the first a second end of the controllable switch, the control end of the first controllable switch receives a switch signal, the first end of the first controllable switch is connected to the first end of the resistor, and the second end of the resistor Connecting the display area, when the driving circuit is in the resistance voltage dividing operation mode, the switching signal is a low level signal, the first controllable switch is turned on, the resistor is divided, and the display area is displayed first Type color
  • a second controllable switch a first end of the second controllable switch is connected to the display area, a control end of the second controllable switch receives the switch signal, and a second end of the second controllable switch Connecting a second pin of the driving chip, when the driving circuit is in a normal working mode, the switching signal is a high level signal, the second controllable switch is turned on, and the display area displays a second type of color ;
  • a technical solution adopted by the present invention is to provide a driving circuit including a driving chip, a first controllable switch and a resistor, and a first pin of the driving chip is connected to the first controllable switch
  • the second end of the first controllable switch receives the switch signal, the first end of the first controllable switch is connected to the first end of the resistor, and the second end of the resistor is connected to the display area.
  • one technical solution adopted by the present invention is to provide a display device, the display device including a driving circuit, the driving circuit including a driving chip, a first controllable switch and a resistor, and the driving chip a first pin is connected to the second end of the first controllable switch, a control end of the first controllable switch receives a switch signal, and a first end of the first controllable switch is connected to the first end of the resistor The second end of the resistor is connected to the display area.
  • the driving circuit is in the resistor divider mode
  • the switch signal is a low level signal
  • the first controllable switch is turned on, and the resistor is divided.
  • the display area displays a first type of color.
  • the invention has the beneficial effects that the driving circuit and the display device of the present invention make the voltage reach half of the original by the control of the first controllable switch and the voltage division of the resistor, which is different from the prior art.
  • the sub-pixels can be displayed in gray, and the number of colors displayed is increased as a whole, thereby making the displayed image more delicate, beautiful and hierarchical.
  • 1 is a circuit diagram of a conventional driving circuit
  • FIG. 2 is a schematic diagram of the principle of the existing area color gradation method
  • FIG. 3 is a circuit diagram of a first embodiment of a driving circuit of the present invention.
  • Figure 4 is a circuit diagram showing a second embodiment of the driving circuit of the present invention.
  • Figure 5 is a schematic view showing the principle of the area gradation method of the present invention.
  • Figure 6 is a schematic diagram of the electrical waveform of Figure 4.
  • Fig. 7 is a schematic structural view of a display device of the present invention.
  • FIG. 1 is a circuit diagram of a conventional driving circuit. It can be seen from FIG. 1 that the driving chip is connected to the display area for outputting a driving signal to the display area for image display.
  • FIG. 2 is a schematic diagram of the principle of the existing area color gradation method. It can be seen from FIG. 2 that each pixel of the display area includes three sub-pixels (ie, a red sub-pixel R, a green sub-pixel G, and a blue sub-pixel B), wherein each sub-pixel is divided into three parts, each There are only two states of light and dark, so that 4 gray scales are formed, and one pixel formed by three sub-pixels displays 64 colors. Since the number of display colors is limited, the displayed image needs to be improved in fineness, beauty and level.
  • FIG. 3 is a circuit diagram of a first embodiment of the driving circuit of the present invention.
  • the driving circuit 1 includes a driving chip 10, a first controllable switch T1 and a resistor R.
  • the first pin 1 of the driving chip 10 is connected to the second end of the first controllable switch T1.
  • the control terminal of the control switch T1 receives the switch signal S1, the first end of the first controllable switch T1 is connected to the first end of the resistor R, and the second end of the resistor R is connected to the display area 20, the driving circuit 1 in the resistor R voltage division mode of operation, the switch signal S1 is a low level signal, the first controllable switch T1 is turned on, the resistor R is divided, and the display area 20 displays the first type of color .
  • the first type of color is 729 colors.
  • the first controllable switch T1 is a P-type thin film transistor, and the control end, the first end and the second end of the first controllable switch T1 respectively correspond to a gate and a drain source of the P-type thin film transistor.
  • the working principle of the driving circuit can be obtained as follows (taking one pixel as an example):
  • the driving circuit When the switch signal S1 is at a low level, the driving circuit is in a resistor divider operation mode, the first controllable switch T1 is turned on, and the first end (ie, the drain) of the first controllable switch T1 is connected in series
  • the resistance R can be divided into half of the voltage, so that the sub-pixel display will show between bright (ie white) and dark (ie black), that is, gray.
  • Each sub-pixel is also divided into three parts, but each part can display three states of black, white, and gray, thus forming 9 gray levels, then one pixel formed by three sub-pixels displays 729 colors because the number of display colors is large. Therefore, the displayed image is more delicate, beautiful and layered.
  • the driving circuit 1 divides the voltage by a high-resistance resistor R to make the voltage reach half of the original, so that the sub-pixels can be displayed in gray, and the number of displayed colors is increased as a whole.
  • FIG. 4 is a circuit diagram of a second embodiment of the driving circuit of the present invention.
  • the second embodiment of the driving circuit is different from the first embodiment in that the driving circuit 1 further includes a second controllable switch T2, and the first end of the second controllable switch T2 is connected to the a display area 20, the control end of the second controllable switch T2 receives the switch signal S1, and the second end of the second controllable switch T2 is connected to the second pin 2 of the drive chip 10, the drive
  • the switch signal S1 is a high level signal
  • the second controllable switch T2 is turned on, and the display area 20 displays a second type of color.
  • the second type of color is 64 colors.
  • the second controllable switch T2 is an N-type thin film transistor, and the control end, the first end and the second end of the second controllable switch T2 respectively correspond to a gate, a source and a drain of the N-type thin film transistor .
  • the working principle of the driving circuit can be obtained as follows (taking one pixel as an example):
  • the drive circuit 1 When the switch signal S1 is at a high level, the drive circuit 1 is in a normal operation mode, the second controllable switch T2 is turned on, and the display area 20 displays a second type of color.
  • the second type of color is 64 colors.
  • each sub-pixel is divided into three parts, each part has only two states of light and dark, and thus four gray levels are formed, and one pixel formed by three sub-pixels displays 64 colors.
  • the driving circuit 1 When the switch signal S1 is at a low level, the driving circuit 1 is in a resistor R voltage division mode, the first controllable switch T1 is turned on, and the first end of the first controllable switch T1 (ie, the drain)
  • the resistor R in series can divide the voltage by half, so that the sub-pixel display will show between bright (ie white) and dark (ie black), that is, gray.
  • Each sub-pixel is also divided into three parts, but each part can display three states of black, white, and gray, thus forming 9 gray levels, then one pixel formed by three sub-pixels displays 729 colors because the number of display colors is large. Therefore, the displayed image is more delicate, beautiful and layered.
  • the driving circuit 1 can display 64 colors by the control of the second controllable switch T2 or 729 colors by the control of the first controllable switch T1, and pass the high-resistance resistor R when displaying 729 colors.
  • the voltage is divided so that the voltage reaches half of the original value, so that the sub-pixels are displayed in gray, and the number of colors displayed is increased as a whole.
  • FIG. 7 is a schematic structural view of a display device of the present invention.
  • the display device 2 includes any one of the above-mentioned driving circuits 1.
  • the other devices and functions of the display device are the same as those of the existing display device, and are not described herein again.
  • the display device is a reflective display. Device.
  • the driving circuit and the display device make the voltage reach half of the original by the control of the first controllable switch and the voltage division of the resistor, so that the sub-pixel can be displayed in gray, and the number of colors displayed is increased as a whole, thereby The displayed image is more delicate, beautiful and layered.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)
  • Liquid Crystal (AREA)
  • Liquid Crystal Display Device Control (AREA)

Abstract

提供了一种驱动电路（1）及显示装置。驱动电路（1）包括驱动芯片（10）、第一可控开关（T1）及电阻（R），驱动芯片（10）的第一引脚（1）连接第一可控开关（T1）的第二端，第一可控开关（T1）的控制端接收开关信号（S1），第一可控开关（T1）的第一端经电阻（R）连接显示区域（20），驱动电路（1）在电阻（R）分压工作模式时，开关信号（S1）为低电平信号，第一可控开关（T1）导通，电阻（R）进行分压，显示区域（20）显示第一类型颜色，以此增加显示的颜色数量，进而使显示的图像更细腻、美观及有层次。

Description

驱动电路及显示装置
【技术领域】
本发明涉及显示技术领域，特别是涉及一种驱动电路及显示装置。
【背景技术】
随着显示技术的发展，显示装置已广泛应用在各种不同的领域，诸如手机、平板电脑或电子纸等各式电子产品。典型的反射式显示装置包括红色、绿色、蓝色的彩色滤光片以及反射显示层。反射显示层位于这些彩色滤光片之下，用以选择性地反射通过这些彩色滤光片的光线，以使反射式显示装置显示图像。现有的反射式显示装置的显示颜色是64色，其显示颜色的数量较少，因此显示的图像在细腻、美观及层次上有待提高。
【发明内容】
本发明主要解决的技术问题是提供一种驱动电路及显示装置，以提高显示颜色的数量，进而使得显示的图像更细腻、美观及有层次。
为解决上述技术问题，本发明采用的一个技术方案是：提供一种驱动电路，所述驱动电路包括驱动芯片、第一可控开关及电阻，所述驱动芯片的第一引脚连接所述第一可控开关的第二端，所述第一可控开关的控制端接收开关信号，所述第一可控开关的第一端连接所述电阻的第一端，所述电阻的第二端连接显示区域，所述驱动电路在电阻分压工作模式时，所述开关信号为低电平信号，所述第一可控开关导通，所述电阻进行分压，所述显示区域显示第一类型颜色；
第二可控开关，所述第二可控开关的第一端连接所述显示区域，所述第二可控开关的控制端接收所述开关信号，所述第二可控开关的第二端连接所述驱动芯片的第二引脚，所述驱动电路在正常工作模式时，所述开关信号为高电平信号，所述第二可控开关导通，所述显示区域显示第二类型颜色；
所述电阻的材料为铟锡氧化物半导体透明导电膜，所述电阻的电阻值满足如下公式：R1=ρ*L/S，其中，R1为所述电阻的电阻值，ρ为电阻率，L为所述电阻的长度，S为所述电阻的高度与宽度的乘积。
为解决上述技术问题，本发明采用的一个技术方案是：提供一种驱动电路，包括驱动芯片、第一可控开关及电阻，所述驱动芯片的第一引脚连接所述第一可控开关的第二端，所述第一可控开关的控制端接收开关信号，所述第一可控开关的第一端连接所述电阻的第一端，所述电阻的第二端连接显示区域，所述驱动电路在电阻分压工作模式时，所述开关信号为低电平信号，所述第一可控开关导通，所述电阻进行分压，所述显示区域显示第一类型颜色。
为解决上述技术问题，本发明采用的一个技术方案是：提供一种显示装置，所述显示装置包括驱动电路，所述驱动电路包括驱动芯片、第一可控开关及电阻，所述驱动芯片的第一引脚连接所述第一可控开关的第二端，所述第一可控开关的控制端接收开关信号，所述第一可控开关的第一端连接所述电阻的第一端，所述电阻的第二端连接显示区域，所述驱动电路在电阻分压工作模式时，所述开关信号为低电平信号，所述第一可控开关导通，所述电阻进行分压，所述显示区域显示第一类型颜色。
本发明的有益效果是：区别于现有技术的情况，本发明的所述驱动电路及显示装置通过所述第一可控开关的控制及所述电阻的分压使电压达到原有的一半，这样可以使子像素显示灰色，整体上增加显示的颜色数量，进而使显示的图像更细腻、美观及有层次。
【附图说明】
图1是现有的驱动电路的电路示意图；
图2是现有的面积色阶法原理示意图；
图3是本发明的驱动电路的第一实施例的电路示意图；
图4是本发明的驱动电路的第二实施例的电路示意图；
图5是本发明的面积色阶法原理示意图；
图6是图4的电性波形示意图；
图7是本发明的显示装置的结构示意图。
【具体实施方式】
请参阅图1，是现有的驱动电路的电路示意图。从图1中可以看出驱动芯片与显示区域相连，用于输出驱动信号给显示区域进行图像显示。请参阅图2，是现有的面积色阶法原理示意图。从图2中可以看出所述显示区域的每个像素包括三个子像素（即红色子像素R、绿色子像素G和蓝色子像素B），其中，每个子像素被分为三部分，每个部分只有亮和暗两个状态，因此形成4灰阶，则三个子像素形成的一个像素显示64色，因为显示颜色的数量有限，因此显示的图像在细腻、美观及层次上有待提高。
请参考图3，是本发明的驱动电路的第一实施例的电路示意图。所述驱动电路1包括驱动芯片10、第一可控开关T1及电阻R，所述驱动芯片10的第一引脚1连接所述第一可控开关T1的第二端，所述第一可控开关T1的控制端接收开关信号S1，所述第一可控开关T1的第一端连接所述电阻R的第一端，所述电阻R的第二端连接显示区域20，所述驱动电路1在电阻R分压工作模式时，所述开关信号S1为低电平信号，所述第一可控开关T1导通，所述电阻R进行分压，所述显示区域20显示第一类型颜色。
在本实施例中，所述第一类型颜色为729色。所述第一可控开关T1为P型薄膜晶体管，所述第一可控开关T1的控制端、第一端及第二端分别对应所述P型薄膜晶体管的栅极、漏极源极。
请参阅图3及图5，可以得到所述驱动电路的工作原理如下（以一个像素为例进行说明）：
当开关信号S1为低电平时，所述驱动电路在电阻分压工作模式，所述第一可控开关T1导通，所述第一可控开关T1的第一端（即漏极）上串联的电阻R可以分得一半的电压，这样子像素显示时会显示介于亮（即白色）与暗（即黑色）中间，也就是灰色。每个子像素也是被分割成三个部分，但是每个部分可以显示黑、白、灰三个状态，因此形成9灰阶，则三个子像素形成的一个像素显示729色，因为显示颜色的数量多，因此显示的图像更细腻、美观及有层次。所述驱动电路1通过高阻抗的电阻R进行分压，使电压达到原有的一半，这样可以使子像素显示灰色，整体上增加显示的颜色数量。
其中，所述电阻R因为需要很大的阻值，所以所述电阻R的材料采用电阻率很高的铟锡氧化物半导体透明导电膜，所述电阻R的其他参数诸如高度、宽度、长度要根据实际需要来选取所需的值。具体地，所述电阻R的电阻值满足如下公式：R1=ρ*L/S，其中，R1为所述电阻R的电阻值，ρ为电阻率，L为所述电阻R的长度，S为所述电阻R的高度与宽度的乘积。
请参阅图4，是本发明的驱动电路的第二实施例的电路示意图。所述驱动电路的第二实施例与上述第一实施例的区别之处在于：所述驱动电路1还包括第二可控开关T2，所述第二可控开关T2的第一端连接所述显示区域20，所述第二可控开关T2的控制端接收所述开关信号S1，所述第二可控开关T2的第二端连接所述驱动芯片10的第二引脚2，所述驱动电路1在正常工作模式时，所述开关信号S1为高电平信号，所述第二可控开关T2导通，所述显示区域20显示第二类型颜色。
在本实施例中，所述第二类型颜色为64色。所述第二可控开关T2为N型薄膜晶体管，所述第二可控开关T2的控制端、第一端及第二端分别对应所述N型薄膜晶体管的栅极、源极及漏极。
请参阅图4至图6，可以得到所述驱动电路的工作原理如下（以一个像素为例进行说明）：
当开关信号S1为高电平时，所述驱动电路1在正常工作模式，所述第二可控开关T2导通，所述显示区域20显示第二类型颜色。其中，所述第二类型颜色为64色。其中，每个子像素被分为三部分，每个部分只有亮和暗两个状态，因此形成4灰阶，则三个子像素形成的一个像素显示64色。
当开关信号S1为低电平时，所述驱动电路1在电阻R分压工作模式，所述第一可控开关T1导通，所述第一可控开关T1的第一端（即漏极）上串联的电阻R可以分得一半的电压，这样子像素显示时会显示介于亮（即白色）与暗（即黑色）中间，也就是灰色。每个子像素也是被分割成三个部分，但是每个部分可以显示黑、白、灰三个状态，因此形成9灰阶，则三个子像素形成的一个像素显示729色，因为显示颜色的数量多，因此显示的图像更细腻、美观及有层次。所述驱动电路1可以通过所述第二可控开关T2的控制来显示64色或者通过所述第一可控开关T1的控制来显示729色，并且在显示729色时通过高阻抗的电阻R进行分压，使电压达到原有的一半，这样可以使子像素显示灰色，整体上增加显示的颜色数量。
请参阅图7，是本发明的显示装置的结构示意图。所述显示装置2包括上述驱动电路1中的任意一种，所述显示装置的其他器件及功能与现有显示装置的器件及功能相同，在此不再赘述，所述显示装置为反射式显示装置。
所述驱动电路及显示装置通过所述第一可控开关的控制及所述电阻的分压使电压达到原有的一半，这样可以使子像素显示灰色，整体上增加显示的颜色数量，进而使显示的图像更细腻、美观及有层次。
以上仅为本发明的实施方式，并非因此限制本发明的专利范围，凡是利用本发明说明书及附图内容所作的等效结构或等效流程变换，或直接或间接运用在其他相关的技术领域，均同理包括在本发明的专利保护范围内。

Claims (11)

  1. 一种驱动电路，其中，所述驱动电路包括驱动芯片、第一可控开关及电阻，所述驱动芯片的第一引脚连接所述第一可控开关的第二端，所述第一可控开关的控制端接收开关信号，所述第一可控开关的第一端连接所述电阻的第一端，所述电阻的第二端连接显示区域，所述驱动电路在电阻分压工作模式时，所述开关信号为低电平信号，所述第一可控开关导通，所述电阻进行分压，所述显示区域显示第一类型颜色；
    第二可控开关，所述第二可控开关的第一端连接所述显示区域，所述第二可控开关的控制端接收所述开关信号，所述第二可控开关的第二端连接所述驱动芯片的第二引脚，所述驱动电路在正常工作模式时，所述开关信号为高电平信号，所述第二可控开关导通，所述显示区域显示第二类型颜色；
    所述电阻的材料为铟锡氧化物半导体透明导电膜，所述电阻的电阻值满足如下公式：R1=ρ*L/S，其中，R1为所述电阻的电阻值，ρ为电阻率，L为所述电阻的长度，S为所述电阻的高度与宽度的乘积。
  2. 一种驱动电路，其中，所述驱动电路包括驱动芯片、第一可控开关及电阻，所述驱动芯片的第一引脚连接所述第一可控开关的第二端，所述第一可控开关的控制端接收开关信号，所述第一可控开关的第一端连接所述电阻的第一端，所述电阻的第二端连接显示区域，所述驱动电路在电阻分压工作模式时，所述开关信号为低电平信号，所述第一可控开关导通，所述电阻进行分压，所述显示区域显示第一类型颜色。
  3. 根据权利要求2所述的驱动电路，其中，所述驱动电路还包括第二可控开关，所述第二可控开关的第一端连接所述显示区域，所述第二可控开关的控制端接收所述开关信号，所述第二可控开关的第二端连接所述驱动芯片的第二引脚，所述驱动电路在正常工作模式时，所述开关信号为高电平信号，所述第二可控开关导通，所述显示区域显示第二类型颜色。
  4. 根据权利要求3所述的驱动电路，其中，所述第一类型颜色为729色，所述第二类型颜色为64色。
  5. 根据权利要求3所述的驱动电路，其中，所述第一可控开关为P型薄膜晶体管，所述第一可控开关的控制端、第一端及第二端分别对应所述P型薄膜晶体管的栅极、漏极源极；所述第二可控开关为N型薄膜晶体管，所述第二可控开关的控制端、第一端及第二端分别对应所述N型薄膜晶体管的栅极、源极及漏极。
  6. 根据权利要求2所述的驱动电路，其中，所述电阻的材料为铟锡氧化物半导体透明导电膜，所述电阻的电阻值满足如下公式：R1=ρ*L/S，其中，R1为所述电阻的电阻值，ρ为电阻率，L为所述电阻的长度，S为所述电阻的高度与宽度的乘积。
  7. 一种显示装置，其中，所述显示装置包括驱动电路，所述驱动电路包括驱动芯片、第一可控开关及电阻，所述驱动芯片的第一引脚连接所述第一可控开关的第二端，所述第一可控开关的控制端接收开关信号，所述第一可控开关的第一端连接所述电阻的第一端，所述电阻的第二端连接显示区域，所述驱动电路在电阻分压工作模式时，所述开关信号为低电平信号，所述第一可控开关导通，所述电阻进行分压，所述显示区域显示第一类型颜色。
  8. 根据权利要求7所述的显示装置，其中，所述驱动电路还包括第二可控开关，所述第二可控开关的第一端连接所述显示区域，所述第二可控开关的控制端接收所述开关信号，所述第二可控开关的第二端连接所述驱动芯片的第二引脚，所述驱动电路在正常工作模式时，所述开关信号为高电平信号，所述第二可控开关导通，所述显示区域显示第二类型颜色。
  9. 根据权利要求8所述的显示装置，其中，所述第一类型颜色为729色，所述第二类型颜色为64色；所述第一可控开关为P型薄膜晶体管，所述第一可控开关的控制端、第一端及第二端分别对应所述P型薄膜晶体管的栅极、漏极源极；所述第二可控开关为N型薄膜晶体管，所述第二可控开关的控制端、第一端及第二端分别对应所述N型薄膜晶体管的栅极、源极及漏极。
  10. 根据权利要求7所述的显示装置，其中，所述电阻的材料为铟锡氧化物半导体透明导电膜，所述电阻的电阻值满足如下公式：R1=ρ*L/S，其中，R1为所述电阻的电阻值，ρ为电阻率，L为所述电阻的长度，S为所述电阻的高度与宽度的乘积。
  11. 根据权利要求7所述的显示装置，其中，所述显示装置为反射式显示装置。
PCT/CN2017/085873 2017-04-25 2017-05-25 驱动电路及显示装置 Ceased WO2018196079A1 (zh)

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