Display Panel Driving Module Equivalent Resistance
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Solution Overview
Problem
In organic light-emitting diode display technology, the narrow width of power lines leads to significant voltage drops, resulting in uneven brightness across the display panel, with the near end being bright and the far end dark, due to varying equivalent resistances, which reduces the display effect.
Innovation Solution
The display panel incorporates a power access end and columns of pixels with pixel driving circuits that include input and driving modules, where the equivalent resistance of the driving module adjacent to the power access end is greater than that of pixels further away, ensuring a more uniform voltage distribution by connecting the light-emitting element's first end to the first power voltage and second end to the driving module, which receives a second power voltage under control of the data signal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the power line width is kept narrow to reduce device area, then the equivalent resistance of the power line increases, but this causes voltage drop and brightness non-uniformity across the display panel
Solution Approach 1:
The patent applies local quality by setting different equivalent resistances for driving modules at different positions. Specifically, pixels closer to the power access end are assigned greater equivalent resistances, while pixels farther away are assigned smaller equivalent resistances. This localized differentiation compensates for the voltage drop along the power line, ensuring uniform brightness across the display panel while maintaining narrow power line widths.
2Reliability
If the equivalent resistance of driving modules is increased to compensate for voltage drop, then brightness uniformity improves, but the power consumption increases
Solution Approach 1:
The patent implements local quality by positioning equivalent resistance specifically within the driving module rather than uniformly across the entire pixel structure. This localized resistance is integrated into the existing driving circuitry, allowing compensation for voltage drop without adding separate power consumption components. The resistance is positioned to affect only the current regulation function, minimizing overall power impact.
3Reliability
If the power line width is increased to reduce equivalent resistance, then voltage drop decreases and brightness uniformity improves, but the device area increases
Solution Approach 1:
The patent introduces an intermediary element - the equivalent resistance within the driving module - that mediates between the power line and the light-emitting element. This intermediary resistance compensates for the voltage drop caused by narrow power lines, allowing the system to maintain small device area while achieving brightness uniformity through electrical compensation rather than physical expansion.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration ensures a more uniform brightness across the display panel by equalizing voltage drops from the near end to the far end, thereby enhancing the display effect.
Implementation Method 1
the equivalent resistance of the driving module of a pixel adjacent to the power access end is greater than an equivalent resistance of a driving module of a pixel away from the power access end
Data Source
AI summary
The present application discloses a display panel and an electronic device. The display panel includes a power access end configured to supply a first power voltage. A driving module is configured to input a second power voltage to a second end of a light-emitting element under a control of a data signal. An equivalent resistance of a driving module of a pixel adjacent to the power access end is greater than an equivalent resistance of a driving module of a pixel away from the power access end.