OLED Panel Timing Control for Brightness Uniformity
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Solution Overview
Problem
The dimming mode in organic electroluminescent display panels often results in timing disorders due to the front-back porch time, leading to unevenly bright and dark displays, caused by the spanning of clock signal cycles between the front-back porch time and display area scanning time.
Innovation Solution
The method involves controlling the light emitting drive circuit to provide a set light emitting cycle during each frame of scanning time, dividing it into display area scanning time and front-back porch time, ensuring that the front-back porch time is less than the display area scanning time and is a multiple of the clock signal cycles, thereby maintaining the integrity of the clock signal cycle and preventing timing disorders.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If dimming mode is employed to eliminate ghosting and speed up response time, then response time is improved, but timing disorder occurs due to front-back porch time spanning clock signal cycles
Solution Approach 1:
The patent changes the timing parameters by setting the front-back porch time to be an integer multiple of the clock signal cycle period. This parameter adjustment ensures that the porch time does not span partial clock cycles, thereby maintaining timing accuracy while preserving the fast response benefits of dimming mode.
2Stability of the object's composition
If front-back porch time is set for drive circuit adjustment, then drive circuit stability is improved, but clock signal cycle spanning occurs causing timing disorder
Solution Approach 1:
The patent adjusts the front-back porch time parameter to satisfy the condition N = k × T, where N is the porch time, k is a positive integer, and T is the clock signal cycle period. This parameter change allows the drive circuit to complete adjustments during the porch period while ensuring the timing boundary aligns with clock cycle boundaries, preventing signal timing precision degradation.
3Illumination intensity
If dimming mode is used to improve display performance, then display quality is improved, but bright and dark mura appears due to timing disorder
Solution Approach 1:
By setting the front-back porch time to be an integer multiple of the clock signal cycle, the patent eliminates timing disorders that cause uneven brightness distribution. This parameter adjustment ensures that the light emitting control signals are generated with accurate timing, preventing bright and dark mura while maintaining the high display quality achieved through dimming mode.
Data Source
AI summary
The disclosure discloses an organic electroluminescent display panel, a driving method thereof and a display device, where the dimming mode is taken to drive and each frame of scanning time is divided into the display area scanning time and the front-back porch time. Where each line of pixel circuits located in the display area of the organic electroluminescent display panel are scanned during the display area scanning time; and the drive circuit is adjusted during the front-back porch time. Where the front-back porch time is less than the display area scanning time, and the front-back porch time is the common multiple of the respective clock signal cycles in the gate drive circuit of the organic electroluminescent display panel.