Unified Transistor Control for Display Subpixel Sensing
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Solution Overview
Problem
Existing display devices face challenges in effectively sensing and compensating for deviations in subpixel characteristic values, leading to luminance non-uniformity and degraded image quality due to variations in driving time and differences between subpixels.
Innovation Solution
A display device and method that simultaneously control the switching transistor and sensing transistor, using a timing controller to determine compensation data based on sensing voltages corresponding to line capacitance and light emitting element capacitance, thereby simplifying the circuit configuration and efficiently sensing and compensating for deviations in subpixel characteristic values.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If individually controlling the switching transistor and sensing transistor is used to sense the source node voltage, then the characteristic value of the subpixel can be sensed, but the circuit configuration becomes complex and control becomes cumbersome
Solution Approach 1:
The patent merges the control of the switching transistor and sensing transistor into a unified control mechanism. The sensing transistor's source node is directly connected to the switching transistor's source node, allowing both transistors to be controlled simultaneously through a single control signal, thereby reducing circuit complexity while maintaining sensing precision
Solution Approach 2:
The sensing transistor serves multiple functions: it senses the source node voltage to determine subpixel characteristic values, operates as part of the driving circuitry, and integrates with the switching transistor control. This multi-functionality reduces the need for separate control mechanisms and simplifies the overall circuit design
2Measurement precision
If separate control of switching transistor and sensing transistor is implemented, then accurate sensing can be achieved, but the control time and processing overhead increase
Solution Approach 1:
The sensing transistor is configured to be controlled in advance along with the switching transistor through unified control signals. By preparing the sensing transistor to be ready and connected to the same source node as the switching transistor, the system eliminates delays associated with sequential control, reducing overall control time while maintaining sensing accuracy
3Measurement precision
If traditional sensing methods are used, then subpixel characteristic values can be measured, but luminance non-uniformity persists due to deviation in characteristic values
Solution Approach 1:
The patent implements a feedback mechanism where the sensed source node voltage (indicating subpixel characteristic values) is used to generate compensation data. This compensation data is then applied to adjust the driving voltage for each subpixel, creating a closed-loop system that actively corrects luminance non-uniformity based on measured characteristic value deviations
Solution Approach 2:
The system changes the driving parameters (voltage levels) for each subpixel based on the sensed characteristic values. By adjusting the data voltage applied to each subpixel according to its specific characteristics, the system compensates for deviations and achieves uniform luminance across all subpixels
Data Source
AI summary
The disclosure relates to a disclosed display device and a display driving method. According to an embodiment, the disclosed display device may include a display panel having a first subpixel including a light emitting element and being connected to a sensing line in the display panel for sensing a characteristic value of the first subpixel; a gate driving circuit configured to supply a scan signal to the first subpixel through a gate line in the display panel; a data driving circuit configured to supply a data voltage to the first subpixel through a data line in the display panel; and a timing controller. The timing controller may be configured to: control the gate driving circuit; determine compensation data for compensating for a deviation in the characteristic value of the first subpixel based on a first sensing voltage, a second sensing voltage, and a third sensing voltage on the sensing line; and control the data driving circuit based on the compensation data.