CN-115691440-B - Display device, data driving circuit, and display driving method

Abstract

Various embodiments of the present disclosure relate to a display device, a data driving circuit, and a display driving method. More specifically, a display device, a data driving circuit, and a display driving method may be provided, the data driving circuit including a gamma driving power detecting circuit for detecting gamma driving power for driving the data driving circuit, and digital image data supplied to the data driving circuit may be controlled according to gamma driving power measurement values detected by the gamma driving power detecting circuit, thereby reducing an increase in temperature of the data driving circuit and improving image quality.

Inventors

• Hong Maoqing

Assignees

• 乐金显示有限公司

Dates

Publication Date

20260508

Application Date

20220615

Priority Date

20210729

Claims (19)

1. 1. A display device, comprising: a display panel in which a plurality of gate lines, a plurality of data lines, and a plurality of sub-pixels are disposed; A gate driving circuit configured to supply a plurality of scan signals to the plurality of gate lines; A data driving circuit configured to convert digital image data into analog data voltages and supply the analog data voltages to the plurality of data lines; a power management circuit configured to supply gamma driving power for driving the data driving circuit to the data driving circuit and configured to include a gamma driving power detection circuit for detecting the gamma driving power, and A timing controller configured to control the gate driving circuit and control the data driving circuit to change an analog data voltage supplied to the display panel according to the gamma driving power measured value detected by the gamma driving power detecting circuit, Wherein when the data driving circuit includes a plurality of source driving integrated circuits, the analog data voltage is changed based on a source driving integrated circuit having a largest variation in gamma driving power among the plurality of source driving integrated circuits.
2. 2. The display device of claim 1, wherein the gamma drive power is varied according to transitions of the digital image data.
3. 3. The display device according to claim 1, wherein the data driving circuit comprises: a shift register configured to convert the digital image data received in a serial form into image data in a parallel form in response to a control signal transmitted from the timing controller, and output the image data; a latch circuit configured to transfer the image data in parallel form on a per-line basis to be simultaneously supplied to the plurality of source driving integrated circuits; a gamma circuit configured to generate a plurality of gamma reference voltages using the gamma driving power; a digital-to-analog converter configured to convert the image data in parallel form into the analog data voltage in response to a plurality of gamma reference voltages transmitted from the gamma circuit, and An output buffer configured to supply the analog data voltage to the plurality of data lines.
4. 4. A display device according to claim 3, wherein the gamma driving power is supplied as driving voltages of the digital-to-analog converter and the output buffer.
5. 5. The display device according to claim 1, wherein the gamma driving power detection circuit includes: a current sense resistor connected in series to the gamma driving power; an operational amplifier connected between two ends of the current sensing resistor and configured to sense a bias voltage, and An analog-to-digital converter configured to convert the bias voltage sensed by the operational amplifier to a digital signal to generate the gamma drive power measurement.
6. 6. The display device of claim 1, wherein the timing controller is configured to decrease the level of the digital image data when the gamma drive power measurement exceeds a reference value.
7. 7. The display device of claim 6, wherein the timing controller is configured to decrease the high level of the digital image data or increase the low level of the digital image data when the gamma drive power measurement exceeds the reference value.
8. 8. The display device of claim 1, wherein the timing controller is configured to reduce a refresh rate of the digital image data when the gamma drive power measurement exceeds a reference value.
9. 9. A data driving circuit comprising: a shift register configured to convert digital image data received in a serial form into image data in a parallel form and output the image data; a latch circuit configured to transfer the image data in parallel form on a per-line basis to be simultaneously supplied to a plurality of source driving integrated circuits; A gamma circuit configured to generate a plurality of gamma reference voltages using gamma driving power; A digital-to-analog converter configured to convert the image data in parallel form into analog data voltages in response to a plurality of gamma reference voltages transmitted from the gamma circuit; an output buffer configured to supply the analog data voltage to a display panel through a plurality of data lines; a gamma driving power detection circuit configured to detect the gamma driving power, and The plurality of source driver integrated circuits, Wherein the analog data voltage is changed based on a source driving integrated circuit having a largest variation in gamma driving power among the plurality of source driving integrated circuits.
10. 10. The data driving circuit of claim 9, wherein the gamma driving power is supplied as driving voltages of the digital-to-analog converter and the output buffer.
11. 11. The data driving circuit of claim 9, wherein the gamma driving power detecting circuit comprises: a current sense resistor connected in series to the gamma driving power; an operational amplifier connected between two ends of the current sensing resistor to sense a bias voltage, and An analog-to-digital converter configured to convert the bias voltage sensed by the operational amplifier to a digital signal to generate the gamma drive power measurement.
12. 12. The data driving circuit of claim 9, wherein the analog data voltage is controlled according to a gamma driving power measurement value detected by the gamma driving power detecting circuit.
13. 13. The data driving circuit of claim 12, wherein the level of the analog data voltage is reduced when the gamma driving power measurement exceeds a reference value.
14. 14. The data driving circuit of claim 12, wherein the refresh rate of the analog data voltage is reduced when the gamma driving power measurement exceeds a reference value.
15. 15. A method for driving a display device including a display panel in which a plurality of gate lines, a plurality of data lines, and a plurality of sub-pixels are disposed, a gate driving circuit that supplies a scan signal to the plurality of gate lines, and a data driving circuit that converts digital image data into analog data voltages and supplies the analog data voltages to the plurality of data lines, the method comprising: Detecting gamma driving power supplied to the data driving circuit; comparing the measured value of the gamma driving power with a reference value; controlling the analog data voltage when the gamma drive power measurement exceeds the reference value, and The analog data voltage is supplied to the display panel, Wherein when the data driving circuit includes a plurality of source driving integrated circuits, the analog data voltage is controlled based on a source driving integrated circuit having a largest variation in gamma driving power among the plurality of source driving integrated circuits.
16. 16. The method of claim 15, wherein the gamma drive power is varied according to transitions of the digital image data.
17. 17. The method of claim 15, wherein controlling the analog data voltage comprises reducing a level of the analog data voltage when the gamma drive power measurement exceeds the reference value.
18. 18. The method of claim 15, wherein controlling the analog data voltage comprises decreasing a high level of the analog data voltage or increasing a low level of the analog data voltage when the gamma driving power measurement exceeds the reference value.
19. 19. The method of claim 15, wherein controlling the analog data voltage comprises reducing a refresh rate of the analog data voltage when the gamma drive power measurement exceeds the reference value.

Description

Display device, data driving circuit, and display driving method Cross Reference to Related Applications The present application claims priority from korean patent application No. 10-2021-0099714, filed on 7.29 of 2021, which is incorporated by reference for all purposes as if fully set forth herein. Technical Field Embodiments of the present disclosure relate to a display device, a data driving circuit, and a display driving method capable of relieving a temperature rise of the driving circuit according to a change in data. Background With the development of information society, various demands for display devices for displaying images are increasing, and various types of display devices, such as Liquid Crystal Displays (LCDs) and Organic Light Emitting Displays (OLEDs), are used. Among these display devices, the organic light emitting display employs organic light emitting diodes, and thus has various advantages in terms of fast responsiveness and contrast, light emitting efficiency, brightness, and viewing angle. The organic light emitting display includes organic light emitting diodes arranged in sub-pixels on a display panel, and emits light by controlling a current flowing to the organic light emitting diodes to control brightness represented by each sub-pixel when displaying an image. The sub-pixels are driven by a scan signal applied through the gate lines, and represent gray scales according to data voltages applied through the data lines based on timing when the scan signal is applied, thereby displaying an image. The data lines to which the data voltages are applied may be arranged one for each sub-pixel column. The display panel may have various structures. With the increase in display performance, the demand for large-scale, high-resolution display panels is increasing. As the area and resolution of the display panel increase, the amount of image data displayed through the display panel increases, and the transition of the image data is frequent. Accordingly, the temperature of the display panel and the data driving circuit for supplying the data voltage increases. Disclosure of Invention Accordingly, as the transition of image data supplied to the display device increases, the temperatures of the data driving circuit and the display panel increase, thereby degrading image quality. Accordingly, the inventors of the present disclosure have invented a display device, a data driving circuit, and a display driving method, which can reduce an increase in temperature of the data driving circuit due to transition of image data. Embodiments of the present disclosure may provide a display device, a data driving circuit, and a display driving method that may reduce an increase in temperature of the data driving circuit by controlling a data voltage according to a change in gamma driving power applied to the data driving circuit. Embodiments of the present disclosure may provide a display device, a data driving circuit, and a display driving method that may reduce an increase in temperature of a data driving circuit by controlling a level or a refresh rate of a data voltage according to a change in gamma driving power applied to the data driving circuit. Embodiments of the present disclosure may provide a display device, a data driving circuit, and a display driving method that may effectively reduce an increase in temperature of a data driving circuit by detecting a change in gamma driving power applied to the data driving circuit regardless of a structure of sub-pixels constituting a display panel. Embodiments of the present disclosure may provide a display device including a display panel in which a plurality of gate lines, a plurality of data lines, and a plurality of sub-pixels are disposed, a gate driving circuit for supplying a scan signal to the plurality of gate lines, a data driving circuit configured to convert digital image data into analog data voltages and supply the analog data voltages to the plurality of data lines, a power management circuit configured to supply gamma driving power for driving the data driving circuit to the data driving circuit and configured to include a gamma driving power detection circuit for detecting the gamma driving power, and a timing controller configured to control the gate driving circuit and control the data driving circuit to change the analog data voltages supplied to the display panel according to gamma driving power measurement values detected by the gamma driving power detection circuit. Embodiments of the present disclosure may provide a data driving circuit including a shift register configured to convert digital image data received in a serial form into image data in a parallel form and output the image data, a latch circuit configured to transmit the image data in the parallel form on a per-line basis to simultaneously supply the image data to a plurality of source driving integrated circuits, a gamma circuit configured to generate a plurality of g