Display Panel Shift Register Voltage Balancing for Uniform Brightness
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Solution Overview
Problem
The significant voltage difference of pulses output by shift units on the top and bottom sides of a display panel due to varying load on fixed-potential signal lines results in poor brightness uniformity.
Innovation Solution
A display panel design with a first signal line connected to shift units and a second signal line receiving the same voltage, where switch units between them are controlled to adjust voltage levels, using a second signal line with stable and linear voltage to counteract attenuation on the first signal line, thereby reducing voltage differences between top and bottom sides.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a fixed-potential signal line is used to provide level voltage to shift units, then the circuit structure is simple, but significant voltage difference occurs between top and bottom sides due to larger load, resulting in poor brightness uniformity
Solution Approach 1:
A second signal line is introduced as an intermediary to provide a stable reference voltage to the first signal line through switch units. This mediator (second signal line) has smaller load and more stable voltage, which compensates for the voltage attenuation on the first signal line, thereby resolving the brightness uniformity issue while maintaining reasonable circuit complexity
Solution Approach 2:
The voltage parameter on the first signal line is dynamically adjusted by controlling the switch units to connect with the second signal line. When voltage attenuation is detected, the switch units enable the first signal line to borrow voltage from the second signal line, changing the voltage parameter to compensate for attenuation and improve brightness uniformity
2Device complexity
If the first signal line is used alone to provide voltage to shift units, then the circuit design is straightforward, but voltage attenuation occurs along the signal line, causing voltage difference between different positions
Solution Approach 1:
The second signal line serves as a voltage reference intermediary that compensates for voltage attenuation on the first signal line. By connecting the first signal line to the second signal line through switch units at different positions, the voltage level consistency is maintained along the entire length of the first signal line, resolving the manufacturing precision issue
Solution Approach 2:
The second signal line is designed to maintain equipotential conditions along its length by having smaller load and receiving same level voltage. This equipotential reference helps stabilize the voltage on the first signal line through the switch units, ensuring consistent voltage levels across different positions of the display panel
Data Source
AI summary
Provided in the embodiments of the present discourse are a display panel, a driving method for the same, and a display device. The display panel includes: a first shift register including a plurality of cascaded first shift units; a first signal line electrically connected to the plurality of first shift units for providing a level voltage required to be output by the first shift units; and a second signal line receiving a same level voltage as the first signal line, where at least one switch unit is connected between the second signal line and the first signal line. The display panel has a first mode, and in the first mode, the first shift units output at least two pluses within one frame, and at least a part of the switch units are turned on.