A matrix display screen and display control method thereof

Abstract

The matrix display screen of the present invention comprises a conductive film, a display layer and a control board, wherein the display layer is located between the conductive film and the control board, and is characterized in that: the control board is provided with transistors or field effect tubes equal in number and corresponding in position to the pixel points, one surface of the pixel point is fixed on the conductive film, and the other surface is electrically connected to the collector or emitter of the transistor or the source or drain of the field effect tube on the control board, and the electrode not connected to the pixel point is connected to the control circuit. The display control method of the present invention comprises: a) defining coloring and fading pixel points; b) applying +V and -V voltages to coloring and fading, respectively; c) applying a voltage greater than Vth to the columns to be displayed. The matrix display screen of the present invention and the display control method thereof not only simplify the structure of the display screen, reduce the manufacturing cost, and make the control circuit simpler and more effective, but also provide a new structure and method for controlling the matrix display screen using transistors, and the beneficial effect is remarkable.

Description

Technical Field

[0001] The present invention relates to a matrix display screen and a display control method thereof, and more specifically, to a matrix display screen which uses triodes to control pixel points and a display control method thereof. Background Art

[0002] The display material changes its optical reflection or absorption rate under the action of an external electric field to display color. After the electric field is removed, the color state remains unchanged, which makes its power consumption extremely low. It can only fade when a reverse electric field is applied. Since the color display of the display material is not active light emission, but passive light emission, it is more suitable for outdoor applications. The stronger the outdoor light, the better the color rendering effect.

[0003] In order to use display materials to display controllable text, graphics, videos and other information, it is necessary to make it into a display screen composed of several pixel blocks (formed by display materials), each pixel block can be individually controlled to display color and fade, and the required information can be displayed by lighting different pixel blocks. To make each pixel block independently controllable, that is, each pixel block can be individually applied with forward voltage and reverse voltage, it is difficult to achieve in terms of circuit structure. For example, the utility model patent document with patent number CN2017200931110 and invention name "A flexible display screen" discloses a control method for an array display screen, the structure of which is that conductive strips are arranged on the upper and lower sides of each pixel block, and the color display and fading of the pixel block are controlled by applying voltages in different directions to the conductive strips, but this color control method requires the production of a large number of conductive strips, which is complex and costly, and each display strip needs to be independently controlled, requiring a large number of control ports, which is very complicated to control and not suitable for application. Summary of the invention

[0004] In order to overcome the disadvantages of the above technical problems, the present invention provides a matrix display screen and a display control method thereof.

[0005] The matrix display screen of the present invention comprises a conductive film, a display layer and a control board, wherein the display layer is located between the conductive film and the control board, the display layer is composed of a plurality of mutually unconnected pixel points, a control circuit for controlling the display layer to display information is arranged on the control board, and the conductive film is connected to the control circuit via a common electrode; the characteristic is that: the control board is provided with transistors or field effect transistors having the same number and corresponding positions as the pixel points, one surface of the pixel point is fixed on the conductive film, and the other surface is electrically connected to the collector or emitter of the transistor or the source or drain of the field effect transistor on the control board; the electrodes of the base, collector and emitter of the transistor that are not connected to the pixel point or the electrodes of the gate, source and drain of the field effect transistor that are not connected to the pixel point are connected to the control circuit.

[0006] In the matrix display screen of the present invention, the pixels and transistors or field effect transistors are distributed in rows and columns, the electrodes in the collectors or emitters of the transistors in the same row that are not connected to the pixels or the electrodes in the sources and drains of the field effect transistors that are not connected to the pixels are connected together and then connected to the control circuit, and the bases of the transistors or the gates of the field effect transistors in the same column are connected together and then connected to the control circuit.

[0007] In the matrix display screen of the present invention, the control board is a PCBA circuit board.

[0008] In the matrix display screen of the present invention, the display layer is arranged on the conductive surface of the conductive film.

[0009] The display control method of the matrix display screen of the present invention is characterized in that the color development voltage of the pixel point is set as +V, the fading voltage is set as -V, and the threshold voltage of the transistor or field effect transistor is set as Vth; the display control method is implemented by the following steps:

[0010] a). Define the coloring and fading pixels. When displaying a column, define which rows of pixels in the column need to be colored and which rows of pixels need to be faded according to the information to be displayed;

[0011] b) Apply fading and coloring voltages, and apply voltages of +V and -V to the rows of transistors or field effect transistors corresponding to the pixels that need to be colored or faded, respectively;

[0012] c) Display control: for the columns that need to be displayed, a voltage greater than Vth is applied to the base of the transistor or the gate of the field effect transistor in the column, and the applied voltage is removed after maintaining the time t1, so that the pixels that need to be displayed in the column are displayed;

[0013] When displaying the next column, steps a), b) and c) are repeated.

[0014] The display control method of the matrix display screen of the present invention includes a refreshing step before information display, and the refreshing method is: firstly, a voltage of +V is applied to the transistors or field effect transistors in all rows, and then a voltage greater than Vth is applied to the base of the transistor or the gate of the field effect transistor in the column to be refreshed, and maintained at time t2, and then a voltage of -V is applied to all rows, and maintained at time t3, so as to realize the color display and fading transformation refreshing of the column; and the same method is used to refresh the next column until the refreshing is completed.

[0015] Beneficial effects of the present invention: The matrix display screen and display control method thereof of the present invention, the display layer arranged on the conductive film is composed of pixel points distributed in rows and columns, by arranging triodes or field effect tubes with the same number and corresponding positions as the pixel points on the control board, the base or collector of the triode, or the drain or source of the field effect tube is electrically connected to the upper surface of the pixel points, the base, collector and emitter of the triode, or the gate and source and drain of the field effect tube that are not connected to the pixel points are connected to the control circuit, and the conductive film is connected to the control circuit via a common electrode (power ground). In this way, under the action of the control circuit, by applying voltage to the base of the triode or the gate of the field effect tube, and the collector and emitter or the source and drain electrodes that are not connected to the pixel points, the corresponding pixel points can be controlled to display color or fade, thereby realizing the display of required text, numbers or letters and other information. The matrix display screen and display control method of the present invention change the previous control form of using at least one I / O port for color display and fading for each pixel of the display material, which not only simplifies the structure of the display screen and reduces the production cost, but also makes the control circuit simpler and more effective, and provides a new structure and method for controlling the matrix display screen using triodes or field effect transistors, which has significant beneficial effects and is suitable for application and promotion. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of the matrix display screen of the present invention;

[0017] Figure 2 It is a front view of the matrix display screen of the present invention;

[0018] Figure 3 A diagram showing the use status of the matrix display screen of the present invention;

[0019] Figure 4 It is a control principle diagram of color development and fading of the matrix display screen of the present invention when field effect tubes are used;

[0020] Figure 5 The present invention is a control principle diagram of color display and fading of the matrix display screen of the present invention when triodes are used.

[0021] In the figure: 1 conductive film, 2 display layer, 3 control board, 4 pixel point, 5 control circuit, 6 transistor or field effect transistor, 7 common electrode. DETAILED DESCRIPTION

[0022] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0023] like Figure 1As shown, a schematic diagram of the structure of the matrix display screen of the present invention is given. The matrix display screen shown is composed of a conductive film 1, a display screen 2 and a control board 3. The conductive film 1 is a transparent conductive film so that the coloring and fading of the display layer 2 can be observed through the conductive film 1. The display layer 2 is arranged on the conductive surface of the conductive film 1. The display layer 2 is composed of a plurality of pixel points 4 arranged in rows and columns. The coloring and fading of the pixel points 4 are used to display text, numbers, letters, images, videos and other information. The display layer 2 is located between the conductive film 1 and the control board 3. The control board 3 is provided with a control circuit 5. The control circuit 5 controls the coloring and fading state of the pixel points 4. The conductive surface on the conductive film 1 is connected to the control circuit 5 via a common electrode 7. Usually, the common electrode 7 is used as a power ground.

[0024] The control board 3 shown is provided with transistors or field effect transistors 6 of the same number and corresponding positions as the pixel points 4, so that the transistors 6 or field effect transistors are distributed in rows and columns. The upper surface of the pixel point 4 is electrically connected to the collector or emitter of the transistor above it or the source or drain of the field effect transistor, such as through a conductive glue. The electrodes in the collector or emitter of the transistor 6 in the same row that are not connected to the pixel point 4, or the electrodes in the source or drain of the field effect transistor that are not connected to the pixel point 4 are connected together and then connected to the control circuit 5; the bases of the transistors or the gates of the field effect transistors in the same column are connected together and then connected to the control circuit 5. Similarly, the bases of the transistors or the gates of the field effect transistors in the same row can also be connected together and then connected to the control circuit 5.

[0025] like Figure 2 As shown in the figure, the front view of the matrix display screen of the present invention is given. The display screen shown is a 32*32 pixel matrix. Each pixel can be 4mm*4mm in size, and the interval between pixels can be 1mm. If the previous control method is used, at least 32*32 conductors need to be set, which is not only complex in structure, but also difficult to implement in process. After the matrix display screen of the present invention is used, only 32+32=64 control ports are needed. If a decoder is used, due to 2 5 +2 5 =64, only 10 control ports are needed, and the display control of pixels can be realized by using a single-chip microcomputer.

[0026] like Figure 4As shown, a control principle diagram of color development and fading of the matrix display screen of the present invention when field effect tubes are used is given. It uses N-type MOS field effect tubes for control. The surface of the pixel point 4 located on the conductive film 1 is grounded via the common electrode 7, and the other surface of the pixel point 4 is connected to the source of the field effect tube. The drains of the field effect tubes in the same row are connected together and then connected to the control end of the control circuit 5. The gates of the field effect tubes in the same column are connected and then connected to the control end of the control circuit 5. In this way, by applying a color development or fading voltage to the row line and applying a gate opening voltage to the column line, the corresponding pixel point 4 can be controlled to develop or fade. As shown in the figure, since a voltage greater than the field effect tube threshold voltage Vth (such as 2V or 3V) is applied to the first column, a positive color development voltage is applied to the first and third rows, and a negative fading voltage is applied to the second and fourth rows, the first and third pixel points 4 from top to bottom in the first column are colored, while the second and fourth pixel points fade.

[0027] like Figure 5 As shown, a control principle diagram of color development and fading of the matrix display screen of the present invention when using triodes is given. Similarly, the surface of the pixel point 4 located on the conductive film 1 is grounded via the common electrode 7, and the other surface of the pixel point 4 is connected to the emitter of the triode. The collectors of the triodes in the same row are connected together and then connected to the control end of the control circuit 5. The bases of the field effect tubes in the same column are connected through resistors and then connected to the control end of the control circuit 5. In this way, by applying a color development or fading voltage to the row line and applying a gate-on voltage to the column line, the corresponding pixel point 4 can be controlled to develop or fade.

[0028] Assuming that the color developing voltage of the pixel point is +V, the fading voltage is -V, and the threshold voltage of the transistor or field effect tube is Vth; the display control method of the matrix display screen of the present invention is implemented by the following steps:

[0029] a). Define the coloring and fading pixels. When displaying a column, define which rows of pixels in the column need to be colored and which rows of pixels need to be faded according to the information to be displayed;

[0030] b) Apply fading and coloring voltages, and apply voltages of +V and -V to the rows of transistors or field effect transistors corresponding to the pixels that need to be colored or faded, respectively;

[0031] c) Display control: for the columns that need to be displayed, a voltage greater than Vth is applied to the base of the transistor or the gate of the field effect transistor in the column, and the applied voltage is removed after maintaining the voltage for a time t1, so that the pixels that need to be displayed in the column are displayed in color; when displaying the next column, steps a), b) and c) are repeated.

[0032] Before information is displayed, the display screen can also be refreshed. The refreshing method is: first apply a voltage of +V to the transistors or field effect transistors in all rows, then apply a voltage greater than or equal to Vth to the base of the transistor or the gate of the field effect transistor in the column to be refreshed, and keep it for t2, then apply a voltage of -V to all rows, and keep it for t3, to achieve the color change and fading of the column; use the same method to refresh the next column until the refresh is completed. Figure 4 As shown in , +V=+1.2V, -V=-1.2V. Among them, t1, t2 and t3 can all be set to 3s. Figure 3 As shown, a diagram of the use status of the matrix display screen of the present invention is given. By controlling the display and fading of the pixels in each column, the text information "Jiayuan Electronics" as shown in the figure can be displayed.

[0033] The control circuit 5 shown should be provided with a power module and a communication module, such as a lithium battery as the power module, and a USB power supply port and a main power switch. The communication module can use a Bluetooth or Wi-Fi module, and can connect to a mobile phone App via Bluetooth or Wi-Fi to design input content: text, numbers, letters, images, etc. If the number of words exceeds 4, they can be scrolled and played.

Claims

1. A display control method for a matrix display screen, based on a matrix display screen, wherein the matrix display screen comprises a conductive film (1), a display layer (2) and a control board (3), wherein the display layer is located between the conductive film and the control board, the display layer is composed of a plurality of mutually unconnected pixel points (4), a control circuit (5) for controlling the display layer to display information is arranged on the control board, and the conductive film is connected to the control circuit via a common electrode (7); characterized in that: The control board is provided with transistors or field effect transistors (6) equal in number to the number of pixels and corresponding in position; one surface of the pixel is fixed on the conductive film, and the other surface is electrically connected to the collector or emitter of the transistor on the control board or the source or drain of the field effect transistor, and connected through conductive glue; the base, collector and emitter of the transistor, or the gate, source and drain of the field effect transistor, which are not connected to the pixel, are connected to the control circuit; The control method comprises: assuming that the color developing voltage of the pixel point is +V, the color fading voltage is -V, and the threshold voltage of the transistor or field effect transistor is Vth; the display control method is implemented by the following steps: a). Define the coloring and fading pixels. When displaying a column, define which rows of pixels in the column need to be colored and which rows of pixels need to be faded according to the information to be displayed; b) Apply fading and coloring voltages, and apply voltages of +V and -V to the rows of transistors or field effect transistors corresponding to the pixels that need to be colored or faded, respectively; c) Display control: for the columns that need to be displayed, a voltage greater than or equal to Vth is applied to the base of the transistor or the gate of the field effect transistor in the column, and the applied voltage is removed after maintaining the time t1, so that the pixels that need to be displayed in the column are displayed; When displaying the next column, repeat steps a), b) and c); The method also includes a refresh step before information display, wherein the refresh method is: firstly, applying a voltage of +V to the transistors or field effect transistors in all rows, then applying a voltage greater than Vth to the base of the transistor or the gate of the field effect transistor in the column to be refreshed, and maintaining the voltage at time t2, then applying a voltage of -V to all rows, and maintaining the voltage at time t3, so as to realize the color display and fading of the column; and refreshing the next column by the same method until the refreshing is completed; The display layer (2) is arranged on the conductive surface of the conductive film (1); The control principle of color display and fading of the matrix display screen when using N-type MOS field effect tubes is as follows: the surface of the pixel on the conductive film is grounded via a common electrode, the other surface of the pixel is connected to the source of the field effect tube, the drains of the field effect tubes in the same row are connected together and then connected to the control end of the control circuit, the gates of the field effect tubes in the same column are connected together and then connected to the control end of the control circuit, and the color display or fading voltage is applied by the row line and the gate opening voltage is applied by the column line, so that the corresponding pixel can be controlled to display or fade; The control principle of color display and fading of a matrix display screen using triodes is as follows: the surface of the pixel on the conductive film is grounded via a common electrode, the other surface of the pixel is connected to the emitter of the triode, the collectors of the triodes in the same row are connected together and then connected to the control end of the control circuit, and the bases of the field effect transistors in the same column are connected via resistors and then connected to the control end of the control circuit; by applying a color display or fading voltage to the row line and applying a gate-on voltage to the column line, the color display or fading of the corresponding pixel (4) can be controlled; The control board (3) is a PCBA circuit board.

2. The display control method of a matrix display screen according to claim 1, characterized in that: The pixel points (4) and the triodes or field effect tubes (6) are distributed in rows and columns; the electrodes in the collectors or emitters of the triodes in the same row that are not connected to the pixel points or the electrodes in the source and drain of the field effect tubes that are not connected to the pixel points are connected together and then connected to the control circuit (5); the bases of the triodes or the gates of the field effect tubes in the same column are connected together and then connected to the control circuit.

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