Display Panel Emission Timing for Low-Frequency Luminance Stability
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Solution Overview
Problem
Display apparatuses experience decreased luminance and quality issues at low driving frequencies due to increased holding cycles, leading to noticeable luminance variation and flicker.
Innovation Solution
The display apparatus adjusts light emission time based on cycle type and number, adjusting the end or start point of the emission signal duration, and increasing the bias voltage when necessary, to maintain consistent luminance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the display apparatus drives the display panel at a low driving frequency, then the number of holding cycles in a frame is increased, but luminance of the display panel is decreased
Solution Approach 1:
The emission signal duration is dynamically adjusted based on the holding cycle number. The driver increases the emission signal duration for later holding cycles (e.g., 3rd, 4th, 5th holding cycles) to compensate for luminance decay, while using shorter durations for earlier cycles. This dynamic adjustment resolves the contradiction by adapting the emission parameters to the specific cycle conditions at low driving frequencies.
Solution Approach 2:
The patent changes the emission signal duration parameter based on the holding cycle number and driving frequency conditions. By modifying this temporal parameter dynamically, the system compensates for the luminance decrease that occurs with repeated holding cycles at low driving frequencies, thereby maintaining stable luminance output.
2Stability of the object's composition
If the emission signal duration is increased to compensate for luminance decrease in later holding cycles, then luminance variation is reduced, but the overall emission time increases
Solution Approach 1:
The emission signal duration is dynamically adjusted based on the holding cycle number. The driver increases the emission signal duration for later holding cycles (e.g., 3rd, 4th, 5th holding cycles) to compensate for luminance decay, while using shorter durations for earlier cycles. This dynamic adjustment resolves the contradiction by adapting the emission parameters to the specific cycle conditions at low driving frequencies.
Solution Approach 2:
The patent changes the emission signal duration parameter based on the holding cycle number and driving frequency conditions. By modifying this temporal parameter dynamically, the system compensates for the luminance decrease that occurs with repeated holding cycles at low driving frequencies, thereby maintaining stable luminance output.
Data Source
AI summary
A display apparatus includes a display panel including a pixel and a display panel driver which output a gate signal, a data voltage, and an emission signal to the pixel. The display apparatus determines whether a driving cycle in a driving sequence is a writing cycle or a holding cycle, determines a holding cycle number of a present holding cycle when holding cycles are repeated in the driving sequence, and determines an emission off time based on the holding cycle number of the present holding cycle by adjusting at least one of an end point of the off duration of the emission signal and a start point of the off duration of the emission signal according to a setting value. Because a luminance difference between the writing cycle and the later portion of the holding cycles is reduced, the display quality of the display apparatus is enhanced.