CN-122024614-A - Display device and pixel precharge method

CN122024614ACN 122024614 ACN122024614 ACN 122024614ACN-122024614-A

Abstract

The application provides a display device and a pixel pre-charging method, and belongs to the technical field of display driving. The display device comprises a plurality of pixel units, a plurality of data lines and a driving chip which are arranged in an array mode. The driving chip is configured to firstly, respectively determine a first impedance value of each odd-numbered data line and a second impedance value of each even-numbered data line according to a first mapping table and a second mapping table, then obtain a first pre-charge parameter according to the first impedance value, and obtain a second pre-charge parameter according to the second impedance value, so that the pixel units of the odd-numbered columns are pre-charged according to the corresponding first pre-charge parameter, and the pixel units of the even-numbered columns are pre-charged according to the corresponding second pre-charge parameter. The method realizes targeted compensation of the precharging of the odd-even data lines so as to eliminate the inconsistent precharging effect caused by different impedance of the odd-even data lines, thereby improving the problem of insufficient charging of each pixel unit caused by inconsistent precharging effect in the row scanning period and further improving the vertical stripe phenomenon.

Inventors

YANG QUNCHANG
DAI JIAHUA
LI JILONG

Assignees

广州华星光电半导体显示技术有限公司

Dates

Publication Date: 20260512
Application Date: 20260317

Claims (10)

1. A display device, comprising: a plurality of pixel units arranged in an array; a plurality of data lines connected with the pixel units; A driver chip having a plurality of data channels, each of the data channels being connected to one of the data lines, the driver chip being configured to: According to the first mapping table and the second mapping table, respectively determining a first impedance value of each odd-numbered data line and a second impedance value of each even-numbered data line; And obtaining a first pre-charge parameter according to the first impedance value, and obtaining a second pre-charge parameter according to the second impedance value, so that the pixel units in the odd columns are pre-charged according to the corresponding first pre-charge parameter, and the pixel units in the even columns are pre-charged according to the corresponding second pre-charge parameter.
2. The display device of claim 1, wherein the driver chip is further configured to: Selecting a plurality of first channel nodes from a first impedance curve stored in an external storage, and determining an impedance value corresponding to the first channel nodes; selecting a plurality of second channel nodes from a second impedance curve stored in an external storage, and determining an impedance value corresponding to the second channel nodes; Comparing the impedance value of the first channel node with the impedance value of the second channel node to obtain a comparison result; And determining the first mapping table and the second mapping table according to the comparison result, the impedance value of the first channel node and the impedance value of the second channel node.
3. The display device of claim 2, wherein the driver chip is further configured to: If the comparison result is that the impedance value of the first channel node is smaller than the impedance value of the second channel node, obtaining the first mapping table according to the impedance value of the first channel node, and obtaining the second mapping table according to the impedance value of the second channel node; And if the comparison result is that the impedance value of the first channel node is larger than the impedance value of the second channel node, obtaining the second mapping table according to the impedance value of the first channel node, and obtaining the first mapping table according to the impedance value of the second channel node.
4. The display device according to claim 1, wherein the first map and the second map include preset channel nodes and impedance values corresponding to the preset channel nodes; the driver chip is further configured to: Selecting one of the first mapping table and the second mapping table as an odd mapping table corresponding to the odd data lines, and the other one of the first mapping table and the second mapping table as an even mapping table corresponding to the even data lines; Fitting the impedance values of the preset channel nodes in the odd mapping tables to obtain odd fitting curves, and fitting the impedance values of the preset channel nodes in the even mapping tables to obtain even fitting curves; Obtaining the first impedance value according to the odd fitting curve for each odd data line; and obtaining the second impedance value according to the even fitting curve for each even data line.
5. The display device according to claim 4, further comprising a feedback circuit for connecting any two adjacent data lines, performing impedance detection on the adjacent data lines, and obtaining a detection signal for representing an impedance magnitude relation between the odd-numbered data lines and the even-numbered data lines, so that the driving chip determines the odd-numbered mapping table and the even-numbered mapping table according to the detection signal.
6. The display device of claim 5, wherein the driver chip is further configured to: Applying excitation voltages with the same amplitude to adjacent data lines connected with the feedback circuit, so that the feedback circuit performs impedance detection on the adjacent data lines according to the excitation voltages and outputs detection signals; Receiving the detection signal, and taking the second mapping table as the odd mapping table and the first mapping table as the even mapping table if the detection signal characterizes that the impedance value of the data line with the impedance magnitude relation of odd is larger than that of the data line with even; and if the detection signal characterizes that the impedance value of the data line with the impedance magnitude relation being odd is smaller than the impedance value of the data line with the even, taking the first mapping table as the odd mapping table and the second mapping table as the even mapping table.
7. The display device of claim 5, wherein the feedback circuit comprises a comparator; the first input end and the second input end of the comparator are respectively connected with the adjacent odd-numbered data lines and the even-numbered data lines, and the output end of the comparator is connected with the driving chip.
8. The display device of claim 1, wherein the first priming parameter comprises a first priming duration and the second priming parameter comprises a second priming duration, the driver chip further configured to: outputting a preset precharge voltage to the corresponding odd data lines in the first precharge period to precharge the corresponding pixel units in the first precharge period; And outputting the preset precharge voltage to the corresponding even number of the data lines in the second precharge time period, so that the corresponding pixel units are precharged in the second precharge time period.
9. The display device of claim 1, wherein the first pre-charge parameter comprises a first pre-charge voltage and the second pre-charge parameter comprises a second pre-charge voltage, the driver chip further configured to: outputting the first pre-charging voltage with preset duration to the odd data lines, so that the corresponding pixel units are pre-charged according to the first pre-charging voltage; outputting the second pre-charging voltage with the preset duration to the even number of the data lines, so that the corresponding pixel units are pre-charged according to the second pre-charging voltage.
10. A method of precharging a pixel, comprising: According to the first mapping table and the second mapping table, determining a first impedance value of each odd data line and a second impedance value of each even data line respectively; And obtaining a first pre-charging parameter according to the first impedance value, and obtaining a second pre-charging parameter according to the second impedance value, so that the pixel units in the odd columns are pre-charged according to the corresponding first pre-charging parameter, and the pixel units in the even columns are pre-charged according to the corresponding second pre-charging parameter.

Description

Display device and pixel precharge method Technical Field The present application relates to the field of display driving technologies, and in particular, to a display device and a pixel precharge method. Background In the field of medium-sized notebook displays, in order to increase the integration level of the display device and reduce the volume, a single chip TED (TCONEmbeddedDriver) scheme is often adopted, which reduces the number of chips and peripheral circuits by integrating a timing controller and a source driver into one chip. At present, due to the limitation of the layout of the data lines, the impedance on the data lines of the odd-even columns will have a difference, and compared with the architecture of separating the timing controller from the source driver, the single-chip architecture can lengthen the wiring of the data lines, and the impedance difference on the data lines of the odd-even columns will be more obvious under the condition that the wiring of the data lines is overlong, so that the pixel charging difference of the odd-even columns is obvious, and the problem of vertical stripe image quality occurs. Disclosure of Invention The embodiment of the application provides a display device to at least partially solve the technical problems. In order to achieve the above object, according to a first aspect of the present application, there is provided a display device including: a plurality of pixel units arranged in an array; a plurality of data lines connected with the pixel units; A driver chip having a plurality of data channels, each of the data channels being connected to one of the data lines, the driver chip being configured to: According to the first mapping table and the second mapping table, respectively determining a first impedance value of each odd-numbered data line and a second impedance value of each even-numbered data line; And obtaining a first pre-charge parameter according to the first impedance value, and obtaining a second pre-charge parameter according to the second impedance value, so that the pixel units in the odd columns are pre-charged according to the corresponding first pre-charge parameter, and the pixel units in the even columns are pre-charged according to the corresponding second pre-charge parameter. Optionally, the driving chip is further configured to: Selecting a plurality of first channel nodes from a first impedance curve stored in an external storage, and determining an impedance value corresponding to the first channel nodes; selecting a plurality of second channel nodes from a second impedance curve stored in an external storage, and determining an impedance value corresponding to the second channel nodes; Comparing the impedance value of the first channel node with the impedance value of the second channel node to obtain a comparison result; And determining the first mapping table and the second mapping table according to the comparison result, the impedance value of the first channel node and the impedance value of the second channel node. Optionally, the driving chip is further configured to: If the comparison result is that the impedance value of the first channel node is smaller than the impedance value of the second channel node, obtaining the first mapping table according to the impedance value of the first channel node, and obtaining the second mapping table according to the impedance value of the second channel node; And if the comparison result is that the impedance value of the first channel node is larger than the impedance value of the second channel node, obtaining the second mapping table according to the impedance value of the first channel node, and obtaining the first mapping table according to the impedance value of the second channel node. Optionally, the first mapping table and the second mapping table include preset channel nodes and impedance values corresponding to the preset channel nodes; the driver chip is further configured to: Selecting one of the first mapping table and the second mapping table as an odd mapping table corresponding to the odd data lines, and the other one of the first mapping table and the second mapping table as an even mapping table corresponding to the even data lines; Fitting the impedance values of the preset channel nodes in the odd mapping tables to obtain odd fitting curves, and fitting the impedance values of the preset channel nodes in the even mapping tables to obtain even fitting curves; Obtaining the first impedance value according to the odd fitting curve for each odd data line; and obtaining the second impedance value according to the even fitting curve for each even data line. Optionally, the device further comprises a feedback circuit, which is used for connecting any two adjacent data lines, performing impedance detection on the adjacent data lines, and obtaining detection signals for representing the impedance magnitude relation between the odd data lines and the even data line