Display Panel Time Control Unit for Brightness Uniformity
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Solution Overview
Problem
Conventional large-size electronic display devices experience uneven brightness due to capacitance-resistance delay in scanning lines, causing sub-pixels close to the gate drive circuit to charge longer than those far away, resulting in voltage differences and uneven brightness across the display panel.
Innovation Solution
A display panel with source drive circuits that include a time control unit to adjust the output duration of data signals based on the distance from the gate drive circuit, using a storage register, clock generator, shift register, detection module, and level setting module to ensure equal charging times across sub-pixels, thereby reducing voltage differences and achieving uniform brightness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the display panel uses a conventional scanning line structure without time control adjustment, then the circuit structure is simple, but the brightness uniformity deteriorates due to capacitance-resistance delay causing different charging durations for sub-pixels at different distances from the gate drive circuit
Solution Approach 1:
The patent applies local quality by making different source drive circuits have different output durations based on their distance from the gate drive circuit. Specifically, source drive circuits closer to the gate drive circuit (which experience less voltage drop) have shorter output durations, while those farther away (which experience more voltage drop) have longer output durations. This localized adjustment compensates for the capacitance-resistance delay and achieves uniform brightness across the display panel.
Solution Approach 2:
The patent changes the time parameter (output duration) of the data signal based on the position of sub-pixels. The time control unit adjusts the output duration parameter dynamically: sub-pixels closer to the gate drive circuit receive data signals with shorter output durations, while sub-pixels farther away receive data signals with longer output durations. This parameter change compensates for the voltage differences caused by capacitance-resistance delay in the scanning line.
2Manufacturing precision
If the output duration is increased for sub-pixels far from the gate drive circuit to compensate for voltage loss, then the brightness uniformity improves, but the charging time increases causing lower productivity
Solution Approach 1:
The patent applies local quality by making different source drive circuits have different output durations based on their distance from the gate drive circuit. Specifically, source drive circuits closer to the gate drive circuit (which experience less voltage drop) have shorter output durations, while those farther away (which experience more voltage drop) have longer output durations. This localized adjustment compensates for the capacitance-resistance delay and achieves uniform brightness across the display panel.
Solution Approach 2:
The patent changes the time parameter (output duration) of the data signal based on the position of sub-pixels. The time control unit adjusts the output duration parameter dynamically: sub-pixels closer to the gate drive circuit receive data signals with shorter output durations, while sub-pixels farther away receive data signals with longer output durations. This parameter change compensates for the voltage differences caused by capacitance-resistance delay in the scanning line.
Data Source
AI summary
A display panel, a display panel driving method, and an electronic device are provided. The electronic device includes a display panel. The display panel includes a display region, source drive circuits, and a gate drive circuit. The display region includes a plurality of sub-pixels. By reducing the charging time of the sub-pixels close to the gate drive circuit and increasing the charging time of the sub-pixels away from the gate drive circuit, the voltage difference between the sub-pixels in different regions is reduced, thereby solving the problem of uneven brightness of the display panel.