TWI659340B - Circuit for balancing display tft non-uniform charging condition - Google Patents

Abstract

A control method for uniformizing the state of charge of a TFT matrix of a display includes the following steps: using a processor to perform a weighted average operation to display a plurality of pictures of at least one line of pixels of a first frame of a display on a display The element voltage generates at least one weighted average voltage value, and stores the at least one weighted average voltage value and at least one row address corresponding to the weighted average voltage value in a memory; and using the processor to perform a brightness compensation operation to display a At least one row of pixels in a VBP scan area is driven according to the at least one weighted average voltage value before the second frame display picture, wherein the scan time of the VBP scan zone is after the scan time of the first frame display picture.

Description

Control method for uniformizing charging state of TFT matrix of display and driving device using same

The present invention relates to a driving method of a display, and more particularly to a control method for making a TFT matrix of a display have a uniform charging state.

Please refer to FIGS. 1a to 1c together, where FIG. 1a is a schematic diagram of a scanning operation of a conventional TFT display; FIG. 1b is a schematic diagram of a screen scanning operation in the scanning operation of FIG. 1a; and FIG. 1c is a scanning operation of FIG. 1a One working timing diagram.

As shown in FIG. 1a, a scanning operation of a thin film transistor (thin film transistor) display can be divided into a VBP (vertical back porch) scanning area 11, and a HBP (horizontal back porch; horizontal recovery). (Back edge) scanning area 12, a picture scanning area 13, a HFP (horizontal front porch) scanning area 14 and a VFP (vertical front porch) vertical scanning area 15, among which the VBP scanning area 11 The scanning timing is a period of time from the start of a vertical synchronization pulse to a frame of effective pixel data; the scanning timing of the HBP scanning area is a period of time from the start of a horizontal synchronization pulse to a line of effective pixel data; the scanning timing of the HFP scanning area 14 The timing from the end of one line of effective pixel data to the start of the next line of horizontal synchronization pulses; and the scanning timing of the VFP scan area 15 is a period of time from the end of one frame of effective pixel data to the start of the next frame of vertical synchronization pulses. In addition, as shown in FIG. 1b, a picture scanning operation of the picture scanning area 13 is performed by turning on a row of pixel transistors by a plurality of gate lines 16, so that a plurality of capacitors of a row of pixels are each charged by a pixel voltage 17. Each pixel has one R (red) pixel, one G (green) pixel, and one B (blue) pixel. That is, as shown in FIG. 1c, the total scanning period of each frame of a TFT display includes a VBP scanning period, a frame scanning period, and a VFP scanning period, and the frame scanning period is within the VBP scanning period. After that, the pixel driving voltages of the first line 1 to the tenth line of the picture scanning area 13 are sequentially updated.

However, for every two adjacent total scanning periods, the subsequent frame scanning period is always separated from the previous frame scanning period by the VFP scanning period and the VBP scanning period. The charging conditions of the pixels of the first line of the picture scanning area 13 will be inconsistent with the charging conditions of the pixels of the other lines, so that the pixels of the first line of the picture scanning area 13 appear as a darker or brighter line.

In order to solve the aforementioned problems, a new TFT display driving method is urgently needed in the art.

An object of the present invention is to disclose a control method for uniformizing a state of charge of a TFT matrix of a display, which can display at least one pixel weighted average voltage value of a previous frame before displaying a next frame of the display screen Driving at least one row of pixels in a VBP scanning area to uniformize the state of charge of a TFT matrix.

Another object of the present invention is to disclose a control method for uniformizing the state of charge of a TFT matrix of a display, which can be performed by displaying at least one pixel of a previous display area before displaying a next display area of a frame display screen. The weighted average voltage value drives at least one row of pixels in an interval scanning region to uniformize the state of charge of a TFT matrix.

In order to achieve the foregoing object, a control circuit for uniformizing the state of charge of a TFT matrix of a display is proposed, which includes the following steps:

A processor is used to perform a weighted average operation to generate at least one weighted average voltage value according to a plurality of pixel voltages of at least one row of pixels of a first frame of a display screen of a display, and the at least one weighted average voltage value and The corresponding at least one row address is stored in a memory; and

Using the processor to perform a brightness compensation operation to drive at least one row of pixels in a VBP scanning area according to the at least one weighted average voltage value before displaying a second frame display screen, wherein the scanning time of the VBP scanning area is in the After the scan time of the first frame display.

In order to achieve the aforementioned purpose, another control circuit for uniformizing the state of charge of the TFT matrix of the display is proposed, which includes the following steps:

Using a processor to perform a weighted average operation to generate at least one weighted average voltage value according to a plurality of pixel voltages of at least one row of pixels in a first display area of a display frame of a display, and weight the at least one The average voltage value and at least one row address corresponding thereto are stored in a memory; and

Using the processor to perform a brightness compensation operation to drive at least one row of pixels of an interval scanning area according to the at least one weighted average voltage value before displaying a second display area of the frame display frame, wherein the scanning of the interval scanning area is performed The time is after the scanning time of the first display area.

In a possible embodiment, the scanning time of the interval scanning area is used to perform a sensing function, and the sensing function may be a touch function, a pressure sensing function, a fingerprint detection function, or other biometric sensing. Test function.

In order to achieve the foregoing object, the present invention further provides a TFT display, which implements a display function by using the aforementioned control method for uniformizing the state of charge of the TFT matrix of the display.

In a possible embodiment, the TFT display is a TFT liquid crystal display or a TFT OLED display.

In order to enable the expensive review committee to further understand the structure, characteristics and purpose of the present invention, the detailed description of the drawings and preferred embodiments are attached as follows.

Please refer to FIG. 2a to FIG. 2c together, which are schematic diagrams for explaining the principle of the present invention, wherein FIG. 2a is a schematic diagram of a scanning operation of a TFT display; FIG. 2b is a screen scanning operation of the scanning operation of FIG. 2a And a schematic diagram of the weighted average of the multi-line pixel voltage generated by the present invention; and FIG. 2c is a schematic diagram of a working sequence of one of the scanning operations of FIG. 2a.

As shown in FIG. 2a, a scanning operation of a TFT display can be divided into a VBP scanning area 11, an HBP scanning area 12, a picture scanning area 13, an HFP scanning area 14 and a VFP scanning area 15. Among them, VBP scanning The scanning timing of area 11 is a period of time from the start of a vertical synchronization pulse to the beginning of a frame of effective pixel data; the scanning timing of a HBP scanning area is the period of time from the start of a horizontal synchronization pulse to the beginning of a row of effective pixel data; the HFP scanning area 14 The scanning timing of is the timing from the end of one line of effective pixel data to the start of the next horizontal sync pulse; and the scanning timing of VFP scan area 15 is the timing from the end of one frame of valid pixel data to the start of the next vertical sync pulse. In addition, as shown in FIG. 2b, a picture scanning operation in the picture scanning area 13 is performed by turning on a row of pixel transistors by a plurality of gate lines 16, so that a plurality of capacitors of a row of pixels are each charged by a pixel voltage 17. Where each pixel has one R (red) pixel, one G (green) pixel and one B (blue) pixel, and the present invention generates a multi-line pixel voltage according to a weighted average calculation formula Weighted average.

Before displaying the next frame, as shown in FIG. 2c, the present invention can drive one line of pixels in a VBP scanning area according to a weighted average voltage value AVE_LINE 10, wherein the scanning time of the VBP scanning area is displayed in the previous frame. After the screen scan time, the charging state of the TFT display is made uniform.

In addition, please refer to FIG. 3a to FIG. 3c together, which is another schematic diagram for explaining the principle of the present invention, wherein FIG. 3a is a schematic diagram of a scanning operation of a TFT display; FIG. 3b is a schematic diagram of a scanning operation of FIG. 3a. A schematic diagram of a screen scanning operation and a multi-line pixel voltage weighted average generated by the present invention; and FIG. 3c is a schematic diagram of a working sequence of one of the scanning operations of FIG. 3a.

Since FIG. 3a and FIG. 3b are the same as FIG. 2a and FIG. 2b, their content is not intended to be repeated here.

During operation, before displaying the next frame, as shown in FIG. 3c, the present invention can drive three lines of pixels in a VBP scanning area according to three weighted average voltage values AVE_LINE 8, AVE_LINE 9, and AVE_LINE 10. The scanning time of the scanning area is after the scanning time of the previous frame display screen to make the charging state of the TFT display uniform.

According to the above-mentioned principle description, the present invention provides a control method for uniformizing the state of charge of a TFT matrix of a display. Please refer to FIG. 4, which illustrates a flowchart of an embodiment of a control method of the present invention. As shown in FIG. 4, the method includes: using a processor to perform a weighted average operation to generate at least one weighted average voltage value according to a plurality of pixel voltages of at least one row of pixels of a first frame of a display screen of a display, and Storing the at least one weighted average voltage value and at least one row address corresponding thereto in a memory (step a1); and using the processor to perform a brightness compensation operation to display a second frame display image before The at least one weighted average voltage value drives at least one row of pixels in a VBP scanning area, wherein the scanning time of the VBP scanning area is after the scanning time of the first frame display frame (step b1).

In another possible embodiment, the method of the present invention can also be applied to two display areas of one frame of a display screen of a display. Please refer to FIG. 5, which illustrates a flowchart of another embodiment of a control method for uniformizing a state of charge of a TFT matrix of a display according to the present invention. As shown in FIG. 5, the control method includes: using a processor to perform a weighted average operation to generate at least one weighting according to a plurality of pixel voltages of at least one row of pixels in a first display area of a display frame of a display. Average the voltage value, and store the at least one weighted average voltage value and at least one row address corresponding to the weighted average voltage value in a memory (step a2); and use the processor to perform a brightness compensation operation to display on the display frame Driving at least one row of pixels of an interval scanning area according to the at least one weighted average voltage value before a second display area of one of the frames, wherein the scanning time of the interval scanning area is after the scanning time of the first display area (step b2) ). In a possible embodiment, the scanning time of the interval scanning area can be used to perform a sensing function, and the sensing function can be a touch function, a pressure sensing function, a fingerprint detection function, or other biometric sensing functions.

In addition, the present invention further proposes a technical solution for implementing the aforementioned control method for uniformizing a TFT matrix charging state of a display on a TFT display. The TFT display may be a TFT liquid crystal display or a TFT OLED (organic light emitting). diode; organic light emitting diode) display.

With the design disclosed above, the present invention has the following advantages:

1. The control method for uniformizing the state of charge of the TFT matrix of the display of the present invention can drive a VBP scanning area by displaying at least one pixel-weighted average voltage value of the previous frame before displaying the next frame of the display frame At least one line of pixels to uniformize the state of charge of a TFT matrix.

2. The control method for uniformizing the state of charge of the TFT matrix of the display of the present invention can be driven by at least one pixel-weighted average voltage value of the previous display area before displaying the next display area of a frame display frame. At least one row of pixels in the scanning region is spaced to uniformize the state of charge of a TFT matrix.

What is disclosed in this case is a preferred embodiment. For example, those who have partial changes or modifications that are derived from the technical ideas of this case and are easily inferred by those skilled in the art, do not depart from the scope of patent rights in this case.

To sum up, regardless of the purpose, method and effect, this case is showing its technical characteristics that are quite different from the conventional ones, and its first invention is practical, and it is also in line with the patent requirements of the invention. Granting patents at an early date will benefit society and feel good.

11‧‧‧VBP scanning area

12‧‧‧HBP scanning area

13‧‧‧Screen scan area

14‧‧‧HFP scanning area

15‧‧‧VFP scanning area

16‧‧‧Gate line

17‧‧‧ pixel voltage

Step a1‧‧‧ uses a processor to perform a weighted average operation to generate at least one weighted average voltage value based on a plurality of pixel voltages of at least one row of pixels in a first frame of a display screen of a display, and the at least one The weighted average voltage value and its corresponding at least one row address are stored in a memory

Step b1‧‧‧ uses the processor to perform a brightness compensation operation to drive at least one row of pixels of a VBP scan area according to the at least one weighted average voltage value before displaying a second frame display screen, wherein the VBP scan area The scan time is after the scan time of the first frame display

Step a2‧‧‧ uses a processor to perform a weighted average operation to generate at least one weighted average voltage value according to a plurality of pixel voltages of at least one row of pixels in a first display area of a display frame of a display. The at least one weighted average voltage value and at least one row address corresponding thereto are stored in a memory

Step b2‧‧‧ uses the processor to perform a brightness compensation operation to drive at least one row of pixels of an interval scanning area according to the at least one weighted average voltage value before displaying a second display area of the frame display frame, wherein the The scanning time of the interval scanning area is after the scanning time of the first display area

FIG. 1a is a schematic diagram of a scanning operation of a conventional TFT display. FIG. 1b is a schematic diagram of a frame scanning operation in the scanning operation of FIG. 1a. FIG. 1c is a working timing diagram of one of the scanning operations of FIG. 1a. FIG. 2a is a schematic diagram of a scanning operation of a TFT display using the control method of the present invention. FIG. 2b is a schematic diagram of a frame scanning operation in the scanning operation of FIG. 2a and a weighted average of pixel voltages of multiple lines generated by the present invention. FIG. 2c is a schematic diagram of a working sequence of one of the scanning operations of FIG. 2a. FIG. 3a is another schematic diagram of a scanning operation of a TFT display using the control method of the present invention. FIG. 3b is a schematic diagram of a screen scanning operation in the scanning operation of FIG. 3a and a weighted average of pixel voltages of multiple lines generated by the present invention. FIG. 3c is a schematic diagram of a working sequence of one of the scanning operations of FIG. 3a. FIG. 4 is a flowchart of an embodiment of a control method for uniformizing a state of charge of a TFT matrix of a display according to the present invention. FIG. 5 is a flowchart of another embodiment of a control method for uniformizing a state of charge of a TFT matrix of a display according to the present invention.

Claims (5)

A control method for uniformizing the state of charge of a TFT matrix of a display is realized on a TFT matrix of a TFT display. The TFT matrix has a VBP scanning area, an HBP scanning area, a picture scanning area, and an HFP scanning. Area and a VFP scanning area, in which the scanning timing of the VBP scanning area is a timing from the start of a vertical synchronization pulse to the start of a frame of effective pixel data; the scanning timing of the HBP scanning area is a horizontal synchronization pulse starting to a line. The timing sequence before the effective pixel data starts; the scanning timing sequence of the HFP scanning area is the timing from the end of one line of the valid pixel data to the start of the horizontal synchronization pulse of the next line; the scanning timing sequence of the VFP scanning area is one frame. A period of time from the end of the effective pixel data to the start of the next vertical synchronization pulse; and a picture scanning operation in the picture scanning area is performed by turning on a row of pixel transistors in turn by a plurality of gate lines to make a line of picture The plurality of prime capacitors are each charged by a pixel voltage. The method includes the following steps: using a processor to perform a weighted average operation to A plurality of the pixel voltages of the pixels in at least one line of a first frame display screen of a TFT display generate at least one weighted average voltage value, and the at least one weighted average voltage value and at least one line position corresponding thereto An address is stored in a memory; and using the processor to perform a brightness compensation operation to drive at least one row of VBP pixels in the VBP scanning area according to the at least one weighted average voltage value before displaying a second frame display screen, The scanning time of the VBP scanning area is after the scanning time of the display frame of the first frame to make the charging state of the TFT matrix uniform. A control method for uniformizing the state of charge of a TFT matrix of a display is realized on a TFT matrix of a TFT display. The TFT matrix has a VBP scanning area, an HBP scanning area, a picture scanning area, and an HFP scanning. Area and a VFP scanning area, in which the scanning timing of the VBP scanning area is a timing from the start of a vertical synchronization pulse to the start of a frame of effective pixel data; the scanning timing of the HBP scanning area is a horizontal synchronization pulse starting to a line. The timing sequence before the effective pixel data starts; the scanning timing sequence of the HFP scanning area is the timing from the end of one line of the valid pixel data to the start of the horizontal synchronization pulse of the next line; the scanning timing sequence of the VFP scanning area is one frame. A period of time from the end of the effective pixel data to the start of the next vertical synchronization pulse; and a picture scanning operation in the picture scanning area is performed by turning on a row of pixel transistors in turn by a plurality of gate lines to make a line of picture The plurality of prime capacitors are each charged by a pixel voltage. The method includes the following steps: using a processor to perform a weighted average operation to A plurality of the pixel voltages of the pixels in at least one row of a first display area of a frame display screen of a TFT display generate at least one weighted average voltage value, and the at least one weighted average voltage value and its corresponding At least one row address is stored in a memory; and using the processor to perform a brightness compensation operation to drive an interval scanning area according to the at least one weighted average voltage value before displaying a second display area of the frame display frame The pixels of at least one row of the pixels, wherein the scanning time of the interval scanning area is after the scanning time of the first display area to make the charging state of the TFT matrix uniform. The control method for uniformizing the state of charge of the TFT matrix of the display device as described in item 2 of the scope of the patent application, wherein the scanning time of the interval scanning area is used to perform a sensing function. A TFT display implements a display function by using the control method for uniformizing the state of charge of a TFT matrix of a display as described in any one of claims 1 to 3. The TFT display according to item 4 of the patent application scope is a TFT liquid crystal display or a TFT OLED display.